Top speeds with 700R4
#1
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Top speeds with 700R4
I'm just wondering what sort of top speeds people have had their autos upto and what gears/power/rpm etc they were at. Reason I'm asking is I'm serriously thinking about changin my 2.73 one wheel go nowhere crap with a 3.23 and SLP posi but I'm not wanting to be left limited with top speed potential.
I'm in the UK and a trip to the Autobhan may be inorder this year with some others and I wouldn't want to fall behind.
Thanks
Robert
I'm in the UK and a trip to the Autobhan may be inorder this year with some others and I wouldn't want to fall behind.
Thanks
Robert
#2
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With 3.23's you wouldn't even be close to topping your car out. To find out your theoretical top speed simply do the normal calculations and factor in about an 8% slippage factor.
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Car: check
Engine: check
Transmission: check
Check that your trans will hold OD at WOT. Some do, some don't. If not will need either a different 3-4 upshift valve or a different/modified TV valve.
RBob.
RBob.
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Car: 1990 IROC
Engine: L98
Transmission: TH700-R4
Originally posted by RBob
Check that your trans will hold OD at WOT. Some do, some don't.
Check that your trans will hold OD at WOT. Some do, some don't.
i didnt think any 700r4's could shift into 4th at WOT in stock form. i believe you have to be at 2/3 throttle or less.
#5
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Originally posted by curt86iroc
i didnt think any 700r4's could shift into 4th at WOT in stock form. i believe you have to be at 2/3 throttle or less.
i didnt think any 700r4's could shift into 4th at WOT in stock form. i believe you have to be at 2/3 throttle or less.
#6
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Car: 1983 G20 Van
Engine: 305 4bbl
Transmission: Possesed 700r4
Early 80s chevy vans maintain OD at high speed at wot. That is with a 700r4. Mine upshifts a 4,400 to 4th then starts slowing down due to aerodynamic drag and the fact that the engine will not pull it @ 2,800 rpm.
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Car: 85 berlinetta
Engine: lg4
Transmission: 700r4
been up to 123mph with 85 berlinetta , stock lg4 cept for little bit of cammage , headers, and exh. 3.08 rear not sure exact rpm, dash was unplugged....was testing out new speedo.woulda pulled more, most likely. got paranoid. have enough points on my license
#11
My 90 Formula 350 has 3.23's and the modified boost valve in the trans to hit 4th at WOT.....I've had her up over 140mph, no markings on my speedo after that but it looked like i was at about 150mph.....and still pullin!!!
#12
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Car: 89' T/A, 00' Firehawk
Engine: 406 Roller
Transmission: TH700R4 w/2800 stall
Axle/Gears: 3.23 Posi
I had my car up to 5500 in OD with 3.23's and 255/50/16's on the back, I don't know how fast that is cause my speedo doesn't work. I slowed down soon after that for fear of going to jail or something bad happening.
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Car: 1990 Iroc-Z
Engine: L98
Transmission: 700R4
Well... I don;t want to rain on your parade, but it isn;t the best idea to maintain speeds over 120mph for long periods of time if the car is equipped with the steel driveshaft. That thing will vibrate so much above 120 it is a saftey hazard! Just friendly concern. Pick up an aluminum driveshaft and speed away
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Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
Originally posted by D Stroy H8
Well... I don;t want to rain on your parade, but it isn;t the best idea to maintain speeds over 120mph for long periods of time if the car is equipped with the steel driveshaft. That thing will vibrate so much above 120 it is a saftey hazard! Just friendly concern. Pick up an aluminum driveshaft and speed away
Well... I don;t want to rain on your parade, but it isn;t the best idea to maintain speeds over 120mph for long periods of time if the car is equipped with the steel driveshaft. That thing will vibrate so much above 120 it is a saftey hazard! Just friendly concern. Pick up an aluminum driveshaft and speed away
umm...... no.
its a hazard if you have a unbalanced driveshaft, but the material its made out of has nothing to do with that.
you would have to be a idiot to have a driveshaft vibrating that much at 120 and say, "hey, lets go even faster!"..
a better hazard to mention is the fact that alot of the people here dont have tires that are safe for thoes speeds.
the brakes are inadquate for a 60-0 stop, nevermind a 130+ to 0 stop.
most people here have old suspension components.
most people here have old steering components.
and im sure theres more.
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Car: 1984 LG4 Camaro
Engine: 350 Roller Motor
Transmission: Level 10 700R4
Axle/Gears: Strange 12 bolt 3.42
Originally posted by pre
The 3.23 grears will lower your top speed from the 2.73
The 3.23 grears will lower your top speed from the 2.73
#16
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Car: 1985 IROC-Z
Engine: 1989 350 4 bolt roller block
Transmission: ProBuilt 700R4 Road Race with Edge 9.5" 2800 stall lockup converter
The factory only rates the steel driveshaft as safe up to 119 mph. The factory aluminum is rated for 200 mph IIRC. (Just updated)
My 700R4 doesn't upshift to 4th gear at full throttle currently, but it will hold 4th gear if I ease into it. Using a calculation based on rpm, I have had my car over 150 with 3.42 gears. This was before I upgraded the heads (pocket-ported, upgraded the valves to 2.02/1.60, backcut stems) added headers, and recalibrated the chip.
Currently, my transmission doesn’t hold anything above 2nd gear........ I’m anxiously awaiting the arrival of my ProBuilt 700R4 and the 9.5” Edge converter!!!!!!!!!
My 700R4 doesn't upshift to 4th gear at full throttle currently, but it will hold 4th gear if I ease into it. Using a calculation based on rpm, I have had my car over 150 with 3.42 gears. This was before I upgraded the heads (pocket-ported, upgraded the valves to 2.02/1.60, backcut stems) added headers, and recalibrated the chip.
Currently, my transmission doesn’t hold anything above 2nd gear........ I’m anxiously awaiting the arrival of my ProBuilt 700R4 and the 9.5” Edge converter!!!!!!!!!
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Car: 1990 IROC
Engine: L98
Transmission: TH700-R4
Originally posted by paul_huryk
100% wrong in 99% of the cases.
100% wrong in 99% of the cases.
#18
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Originally posted by curt86iroc
i think thats 100% right in 99% of the cases
i think thats 100% right in 99% of the cases
Last edited by 25THRSS; 02-12-2004 at 09:59 PM.
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Car: 87 Firebird
Engine: 305 LG4
Transmission: THM700R4
Having higher RPMs at the same speed then another car with lower gears(lower number like 2.73) means that you will run out of RPM range faster therefore losing top speed.
#20
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Originally posted by pre
Having higher RPMs at the same speed then another car with lower gears(lower number like 2.73) means that you will run out of RPM range faster therefore losing top speed.
Having higher RPMs at the same speed then another car with lower gears(lower number like 2.73) means that you will run out of RPM range faster therefore losing top speed.
EDIT: It will lower your theoretical top speed, but not your actual top speed.
#21
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With 2.73's you'll top out in 3rd gear, you won't have the power to go any faster in 4th. With 3.23's you'll either be at the top of 3rd or well into 4th depending on your engine.
I got pulled over at a police radar verified 148mph (he showed it to me ) in my '83 TA 27" tall back tires, 3.23's and some mild mods…
I got pulled over at a police radar verified 148mph (he showed it to me ) in my '83 TA 27" tall back tires, 3.23's and some mild mods…
#22
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I've hit 140 with mine embarassing and newer Mustang GT. I can only do about 75/80% throttle in 4th before it tries to downshift to third. It just won't climb past 4200-4300 RPM with that much throttle. Kinda strange really, it doesn't actually downshift. It tries, but the engine just spins freely almost. Too much throttle for 4th, but too much RPM for third with not enough throttle opening and its like revving in neutral.
If I could lock the trans in 4th at WOT I should be able to hit 160 or so with the 3.42s.
If I could lock the trans in 4th at WOT I should be able to hit 160 or so with the 3.42s.
Last edited by Marc 85Z28; 02-25-2004 at 02:43 PM.
#23
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Car: 1991 Camaro Z28 5.7 G92
Engine: L98 Tuned Port Injection
Transmission: TH700R4
Axle/Gears: 3.23 Posi G80
Dang you guys!!
My car feels like it is going to blow up at about 105-110 and I don't even try to go faster. My motor has the power easy, but maybe it's cause I have a steel drive shaft. My 700 wouln't even hold 3rd gear at WOT the engine would just start reving slowly after 4000 in 3rd but I would not be going any faster. I guess it was slipping. Haven't tried to max it out with the 5 speed yet but the car still feels like the chassis will blow up if I try anything faster than 110. Maybe it's time for some new suspension. and maybe a tire balance. (209,000 miles on stock suspension)
#24
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My '83 had the stock steel DS at the time. My '87 has a big, Denny's 3.5" Metal Matrix DS in it, but I've never had it over about 125mph. My '97 wouldn't go over about 75 (4.10 gears) without a killer vibration, but at about 95 would smooth out again. Would start the same crap at about 140, but I fixed that eventually
Last edited by 83 Crossfire TA; 02-25-2004 at 06:19 PM.
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Car: 86 firebird with 98 firebird interi
Engine: pump gas 427sbc Dart Lil M 13.5:1
Transmission: Oldani TH400 w/ BTE 9" convertor
Axle/Gears: 31 spline Moser/full spool/4.11Rich
you know that's not a good idea on a cold engine dont you
I wish I woulda got a 200mph gauge for my cluster, coulda posted a buried pic and wowed everybody gear swap, smaller tire, ice patch, etc...If that's legit, you got *****
I wish I woulda got a 200mph gauge for my cluster, coulda posted a buried pic and wowed everybody gear swap, smaller tire, ice patch, etc...If that's legit, you got *****
#27
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Originally posted by IHI
you know that's not a good idea on a cold engine dont you
you know that's not a good idea on a cold engine dont you
I wish I woulda got a 200mph gauge for my cluster, coulda posted a buried pic and wowed everybody gear swap, smaller tire, ice patch, etc...If that's legit, you got *****
#28
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Car: 1992 Z28 and 1988 IROC-Z
Engine: both L98s one with SD and one with MAF
Transmission: both 700R4s
I have a 92 Z w/700r4 and as far as I know it dosnt have any special TV valve to make it hold 4th, I just go onto the throttle smooth and it will stay in 4, I have 2.73s w/ posi and I was at 140 and still pulling, third gear it would only do about 120. stock motor w/150k. just to let you guys know.
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Car: 92 Z/28 clone
Engine: 383 carbed
Transmission: t-5
Axle/Gears: 3.73
my speedo only goes up to 120 and i had it on the peg and also my tach was tached out...lets just say i don't plan on doing that again........state trooper flaged me at 170.....luckly for me he was a good friend of mine...i told him i wanted to find out what i could do top end and he said sure..just don't make it a habit........besides........it scared the bejeebus outta me and the guy riding with me
#30
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Originally posted by 83 Crossfire TA
My '97 wouldn't go over about 75 (4.10 gears) without a killer vibration, but at about 95 would smooth out again. Would start the same crap at about 140, but I fixed that eventually
My '97 wouldn't go over about 75 (4.10 gears) without a killer vibration, but at about 95 would smooth out again. Would start the same crap at about 140, but I fixed that eventually
#32
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I've topped out the speedo in the '89 so 145+ maybe 150. 3.27 r9bolt/ modded 700R4/ balanced steel shaft. I don't remember the RPM's. I was walked like I was standing still by a early '80's capri style stang @ the same time!
#33
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Reason for this thread was I was thinking of my Pro-Built that I'm about to order and....
.....3.08's, about 500bhp at 5650rpm and an Autobhan to have a realistic attempt of 200mph. I believe that's about it. Just need to setup for that.
.....3.08's, about 500bhp at 5650rpm and an Autobhan to have a realistic attempt of 200mph. I believe that's about it. Just need to setup for that.
#35
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Originally posted by RMK
Reason for this thread was I was thinking of my Pro-Built that I'm about to order and....
.....3.08's, about 500bhp at 5650rpm and an Autobhan to have a realistic attempt of 200mph. I believe that's about it. Just need to setup for that.
Reason for this thread was I was thinking of my Pro-Built that I'm about to order and....
.....3.08's, about 500bhp at 5650rpm and an Autobhan to have a realistic attempt of 200mph. I believe that's about it. Just need to setup for that.
#36
Main thing im wondering is what would be the difference in top speed of lets say...
3 speed auto ( th 350 )
4 speed auto ( th 700 )
5 speed manual
6 speed manual
?????
In the 1/4 it makes no difference in speed, but were talking top speed. I would think the higher gears will give more, but the lower gears in the others just keep you in the same gear longer. So what does it come down to? Final drive gear maybe?
Just wondering.
3 speed auto ( th 350 )
4 speed auto ( th 700 )
5 speed manual
6 speed manual
?????
In the 1/4 it makes no difference in speed, but were talking top speed. I would think the higher gears will give more, but the lower gears in the others just keep you in the same gear longer. So what does it come down to? Final drive gear maybe?
Just wondering.
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Car: 89 trans am
Engine: 355
Transmission: 700r4
Originally posted by wallyZ/28
my speedo only goes up to 120 and i had it on the peg and also my tach was tached out...lets just say i don't plan on doing that again........state trooper flaged me at 170.....luckly for me he was a good friend of mine...i told him i wanted to find out what i could do top end and he said sure..just don't make it a habit........besides........it scared the bejeebus outta me and the guy riding with me
my speedo only goes up to 120 and i had it on the peg and also my tach was tached out...lets just say i don't plan on doing that again........state trooper flaged me at 170.....luckly for me he was a good friend of mine...i told him i wanted to find out what i could do top end and he said sure..just don't make it a habit........besides........it scared the bejeebus outta me and the guy riding with me
lol.
well everyone else is saying what they have done i have been to 132mph in my 89 and it definitely was werid seeing how if a cop ever saw that in a 65mph zone bye bye license. i only did that 1 time and my 84 trans am seemed like i got that up there in speed but it only had the 85mph speedo.. but i let the gas off and it just stayed burried (the speedometer) but now i am switching my 89 from 2.73's to 3.42's but i also have many many mods to my motor so now i think my speedometer will be off alot.
also had a chance to snap this on a back road.. that was scary because it's about as wide as 1 lane but it's a 2 lane road.
Last edited by trans_am_ta_84; 03-02-2004 at 10:56 PM.
#40
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Car: 89 formula 350
Engine: ls1 magnuson tvs2300 supercharger
Transmission: T56
Axle/Gears: 4.11 Dana 44!
137mph here.....
3.27 rear
700r4
L98
had more in her, but the road was closing fast
3.27 rear
700r4
L98
had more in her, but the road was closing fast
#41
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Originally posted by 83 Crossfire TA
OK, to start with, you're not going to put down any real power to the ground in overdrive in most trannys. they just aren't designed to do it.
OK, to start with, you're not going to put down any real power to the ground in overdrive in most trannys. they just aren't designed to do it.
#43
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Thread Starter
What do you think is a more realistic top speed that could be reached with 500bhp?
To hit 200mph in 3rd, I'd have to rev the engine to around 7200rpm with 2.73's, and i'm too far into my current project of 500bhp to change things now. This is most unfortunate.
To hit 200mph in 3rd, I'd have to rev the engine to around 7200rpm with 2.73's, and i'm too far into my current project of 500bhp to change things now. This is most unfortunate.
#44
In canada the guage on a third gen says KPH on top and MPH on the bottom, that and its about an inch lower, I went right past that sticker and i was only at 4k rpm, and plenty of power left. According to my calculations, 336 is my top speed.(theoretical) (~56 kph, per 1k rpm in 4th gear is about that) now factor in 10% slip and you get 302.4. So im guessing my top speed is 302.4 kph. Ofcorse, im not going to test this. My DS is aluminum but dont be stupid, tires can blow really easily.
PS, 89 gta, 350, heavy mods (unknown the extent, but it blows away ALL my friends cars, even a done up 350 iroc) with 700r4.
oh and 302.4kph is around 190mph (189 sometihng). And i still burn out the tires in dry weather at any more then 1/3 throttle.
Oh, and if anyone tells me that thats impossible, keep it to yourself cause like i said, its theoretical, and im not going to test it. All i know is i definitly went halfway to the peg before i backed off.
PS, 89 gta, 350, heavy mods (unknown the extent, but it blows away ALL my friends cars, even a done up 350 iroc) with 700r4.
oh and 302.4kph is around 190mph (189 sometihng). And i still burn out the tires in dry weather at any more then 1/3 throttle.
Oh, and if anyone tells me that thats impossible, keep it to yourself cause like i said, its theoretical, and im not going to test it. All i know is i definitly went halfway to the peg before i backed off.
#45
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Car: 92' RS
Engine: 357
Transmission: TH350
Axle/Gears: 4.10
83' crossfire T/A isnt relating to your engine torque. Its that very unkown complex "Axle Torque" that i think he's talking about?
#46
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First, I'm not talking about either… at this point it's not even a question of power. It's a question of what overdrive was designed to do. 200mph will take every bit of 700hp (drag goes up by the ^4 of speed), and overdrive is not designed to hold anywhere near that power. Remember that to keep your car going 30-65mph you're probably actually using about 30-60hp trough overdrive. Double that (say something like my full size truck towing a car trailer up a hill) if you managed to get it to stay in 4th you'd find it's limit very quickly.
Second, sounds like we've got a lot of 10, 11, 12 and a few 13 second f-bodies here. Figure it would take about 300hp to put your average camaro or 4th gen into the 140-150mph range, slightly less with a firebird/ta depending on the years and options. Most stock/near stock TPI cars will top out in the 130-135mph range. If you think that you're going to go over 150mph in an f-body that's running less then 12's at the track, well…
Second, sounds like we've got a lot of 10, 11, 12 and a few 13 second f-bodies here. Figure it would take about 300hp to put your average camaro or 4th gen into the 140-150mph range, slightly less with a firebird/ta depending on the years and options. Most stock/near stock TPI cars will top out in the 130-135mph range. If you think that you're going to go over 150mph in an f-body that's running less then 12's at the track, well…
#47
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Thread Starter
I believe the stock L98s would do about 145-150mph. I would have expected a 300bhp 3rd gen to go a little higher, like 155.
#48
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Car: 91 z28
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Re: Top speeds with 700R4
my 91 l98 camaro is pretty much stock powerwise besides a k and n filter directly on the throttle body. it has 120k miles on it and i did install the 3-4 wot upshift sleeve. and i managed to bury that needle and kept it buried so it was going over 150. and my speedo is correct
#49
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Car: 86 firebird with 98 firebird interi
Engine: pump gas 427sbc Dart Lil M 13.5:1
Transmission: Oldani TH400 w/ BTE 9" convertor
Axle/Gears: 31 spline Moser/full spool/4.11Rich
Re: Top speeds with 700R4
my 91 l98 camaro is pretty much stock powerwise besides a k and n filter directly on the throttle body. it has 120k miles on it and i did install the 3-4 wot upshift sleeve. and i managed to bury that needle and kept it buried so it was going over 150. and my speedo is correct
better add another 150hp and hope all the stars align to over come the wind resistance to achieve speeds near what your dreaming..WOW
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Car: 86 Z28
Engine: 350 TPI
Transmission: T56
Axle/Gears: 3.42 posi
Re: Top speeds with 700R4
whats the top speed you can get to with the t-tops off? How much of a difference does it make when there off or on?