jbander

That's what the tachometer says anyway.In third gear I floor it and the tach jumps up to 7000rpm and stays there as the car accelerates. It will accelerate up to 150 doing it this way. Any thoughts at all are welcome.What other information would be helpful from me.

sofakingdom

iTrader: (1)

I'd check the "tach" (wavy-pointer-thing "sporty" trim package) accuracy first. Compare to a piece of known-good test equipment.

Instinct tells me that (a) if the engine was REALLY running 7000 RPM continuously every time you put your foot on the gas, and (b) the transmission was REALLY slipping at that RPM, your post would be about something AHELLUVALOT different than what it is. Like, why does my trans fluid look like fireplace ashes, or what are all these tiny metal fragments laying on the ground underneath my oil pan which now has holes but no oil in it and my engine won't start.

IROCZman15

iTrader: (25)

what do you mean.... "accelerate up to 150". ....
.. mph?
... you aren't going 150 mph in that car... !!!!

jbander

You do the math 4.11 gears, 29.1 tires, 7200 rpm ----460hp +or - with 250 shot in the back seat. Now tell me again that I can't go that fast ace. Why is there always someone like this on these forums. Why can't people just try to help. By the way ace that's in 3rd gear in a 700r4

TTOP350

iTrader: (8)

Tack having electrical issues and wrong, trans slipping or converter is to big? Could be most anything.

Did you change the drive and driven gear in the trans to match the rear gear and tire size?

My 89 formula 350 would run 144-6ish mph when stock. Good times

jbander

Thanks for the response ,I put in a ford 9 inch last winter 4.11 gears and final gear is stock 1 In 3rd gear I'm assuming . I didn't change it but I don't know what was the total build on the transmission.

IROCZman15

iTrader: (25)

"ace" ? ok,

The title of a "slipping transmission" and followed up by "as I accelerate to 150 mph" are completely different realms and I don't think you could technically have a slipping transmission while accelerating to 150mph. .


while I didn't mean to offend you, I did have my doubts that there is more than a small handfull of TGO members that are trapping 150 mph in the 1/4 mile with an actual timeslip or video. In my haste, I didn't think that you might have meant on the open street. And, if I am wrong and you truly do trap 150+ mph in the 1/4 mile, then I eat my words and apologize. I just am aware that 150+mph timeslips are parachute territory and full 8.50 certified roll cages. Very few members here are at that level. Therefore, I assumed (maybe incorrectly) that you were just spit-balling a 150mph number.

Did not mean to insult you.
I do still think that in 3rd gear with those specs you listed the math is a bit awry.. but I am only going from my current real-world experience with my 406 sbc, nitrous, 700r4, 3.91 gear and 26" tires. At 6,400 rpms in 3rd gear I am at 123 mph, so something is confusing if you are at 150mph in 3rd at 7,200?

Nonetheless, your tachometer is probably the victim of EMI or electric interference. Do you have it hooked up to a CD ignition box? Some CD boxes have a spade terminal connection you plug your tach into. Sometimes a filter is needed for square wave signals. This stuff is over my head, but maybe others can chime in.

Aaron R.

You guys were supposed to know all this from the post title "700r4 slipping"

Yet somehow I have a hard time understanding how someone who knows enough to push an extremely modified third gen to 150mph can't tell if his transmission is slipping.

My first assumption was 150 kph since the post just said "150", so I'm as guilty as the rest of assuming this was just another normal car with a possible slipping issue, although the whole 7k rpm part had me wondering what might have been completely left out that might help me form an opinion....

jbander

Who in the hell said anything about a 1/4 mile ace, I have a 7 mile stretch to play with , in a state park with no roads adjoining and the right time of the day, no cars and no car can pop up with minimal views of two miles ahead . You still don't think my numbers add up ,OK ace. Its a simple math equation if you can't do math there is 100 calculators online to run the numbers for you. Here you go ace this one is as simple as they get https://spicerparts.com/calculators/...rpm-calculator. Basically ,I just don't get this ****, I'm tired of bumping heads with people when I just ask a simple question. Why dump **** on people when they ask for help.
Your number You gave me actually should add up to 126.66 MPH. If you would be adding my tires to your car ace you would be up to 141.76. A 2017 to 2021 zl1 has 50 less horsepower then mine and weight of a whopping 700 lbs more then mine and it runs 200 MPH + or- With the aero crap off of it.. Keep your advice and ideas, I'll look for advice from others.

jbander

]Who in the hell said anything about a 1/4 mile ace, I have a 7 mile stretch to play with , in a state park with no roads adjoining and the right time of the day, no cars and no car can pop up with minimal views of two miles ahead . You still don't think my numbers add up ,OK ace. Its a simple math equation if you can't do math there is 100 calculators online to run the numbers for you. Here you go ace this one is as simple as they get https://spicerparts.com/calculators/...rpm-calculator. Basically ,I just don't get this ****, I'm tired of bumping heads with people when I just ask a simple question. Why dump **** on people when they ask for help.
Your number You gave me on your car, actually should add up to 126.66 MPH. If you would be adding my tires to your car ace you would be up to 141.76. A 2017 to 2021 zl1 has 50 less horsepower then mine and weight of a whopping 700 lbs more then mine and it runs 200 MPH + or- With the aero crap off of it.. Keep your advice and ideas, I'll look for advice from others.[/QUOTE]

Arctic White 91 RS

Years ago my 91 RS's tach did the samething if you floored it. The tach would show 7,000rpm as the car accelated normally. The tach also read high at cruise. A capacitor in the tach electronics in the dash had went bad.

Not sure if that's the OP's issue but it's a fairly common dash gauge cluster problem.

jbander

Thanks Arctic. I think I can pin it down today , I still have the stock dash tach , I'm hooking it up ,it should tell me whats going on.

Pro Built Automatics

With 4.11's and 29.1" tires. Yes, that is approximately 7,200 rpm. I have kept one of the Iskenderian Ratio Computer wheels next to me for the last 55 years, just for this. There is definitely something wrong with the tachometer. If this transmission was slipping. Once you hit this rpm, the 3-4 clutch would be gone in a couple of seconds, and there would be no acceleration "at all". Since "you know" that you are going at that speed. Then the transmissions 3-4 clutch pack is working fine. Once you get above approximately 6,200 rpm, many times (in Firebirds and Camaros) the torque converter clutch will come on. This will give you a manual transmission capability at WOT at high speeds (1 to 1) no torque converter slip.

jbander

Well this is where I'm at , disconnected My aftermarket tack, connected the one that is in the car It worked, Ran a flash stall test it showed about 3800 flash stall, ran just a stall test and didn't give me much information. Seemed to force my tires right from beginning acceleration. Its a SRL series 9.5” billet 3200 lockup converter. I reconnected the aftermarket tach and that's working fine again also. So I Don't really know what happened but I'm happy with it back to where it is,

Aaron R.

Glad you got it fixed, ace.

IROCZman15

iTrader: (25)

JEEZ man, chill out.
You conveniently bypassed the SEVERAL times where I offered a reasonable apology/explanation in my post above.... and just continued on your sarcastic rant like you were being victim of a violent continual attack. Lighten up; ace. Your initial (and very vague) post made it seem like you were very confused about something that would be very noticeable (transmission slipping while accelerating to 150 mph). You also didnt post any technical powertrain info about your combo, leaving us unaware of who you were and what you were running. Nobody is "dumping **** on you" as you claim, that is not how me or anyone here conducts business. There is no need for hostility or name calling here; this is thirdgen.org, not mainstream social media nonsense.

After all this tachometer/transmission troubleshooting was sorted out, I was going to ask you some tech related questions about your sbc nitrous setup since I have similar goals for my setup as it evolves, but I'm not sure if you would be reserved enough to talk tech with or not.

jbander

Thanks Aaron

jbander

There you go you made your case, I didn't introduce myself with The tech sheet on my car because literally when I did it here in the past , I got the same load of **** from people on that also. This has been a source for information that I've needed to keep my project going . I've had wonderful help here and when helped I've shown appreciations and I"ve been thankful. There is also a group in every car forum that are looking for reasons to get on you for anything possible. This is what I've learned dealing with these people , when you let them get away with it and just look the other way , then all the creepos jump in with insults and snide remarks supporting the garbage that the the original antagonist threw out and you don't get the information that you ask for or need. Lots of people come in here like me without the right terminology or the best way to ask a question or lacking in obvious knowledge, (well obvious to most people anyway.) If some guy goes after them ,as happens often, then this interest in cars that we are all suppose to be sharing is crapped on.

Arctic White 91 RS

Glad the tach is working properly again. Must have been an electrical connection or capacitor that hadn't discharged etc.

This should be a sticky on every car forum.

jbander

Thanks Arctic

IROCZman15

iTrader: (25)

Understood, understood. I also have been lucky to have been guided by some of the well-versed tech guru's here on this website over recent years during my current build. I'm equally thankful, and of course willing to pass anything I have learned onto others. I can assure you I don't fall into that "sarcastic, spiteful, and flashy attitude type group", so sorry if it came across that way. A search of my forum posts for many years will tell the same. I am only on car forums for tech stuff, and i have always stayed far away from facebook and the other big social media web services. So, hopefully that sets thigns clear.


-I am curious to learn your thoughts on some of your nitrous and tuning choices, as I have a few questions there, like if you trust your 700r4 launching off the footbrake or transbrake? I've footbrake launched from 1800 and brought in the nitrous around 3,000..however I have contemplated a lower footbrake launch (like 1000 rpm) and bringing the nitrous in right away. I've also played around with getting off the nitrous while making the 1-2 and 2-3 shift and also staying on the nitrous. (100 and 125 shot so far, but will be going to 150-175 and maybe 200 wet shot).
-Also, I am curious about what you run for exhaust, as this winter I want to beef up my exhaust system significantly. Headers, collectors, y? 4" to the back?
- I also plan to upgrade to a taller set of tires too (next year) after I finish off these 26" tall MT Et Street SS tires. Probably will only go with a 28" tall setup, but I have time to decide.
-I can reach out to you via a PM instead if that would be a better format.

Anyways, glad you got the tach situation sorted out and that it was nothing major afterall.

jbander

First I bought this car for the challenge and I like fast. The build is a strong build set up for nitrous and High RPM. I built the nitrous system myself ,The exhaust system ,new interior, 5 point harness and put in a ford super strong 9inch myself and I've done the work needed to keep it running at peek performance while I've driven almost daily over two summers and that's where the work lies. I;m very busy during the summer, So it's a push to keep it running sweet. I'm at a point in the build that it would be a large expense for the required Safety equipment to run the car at a track and I\m really not that interested in doing it anyway. I would rather use that money to go faster, then being protected for a couple of minutes at a track. I have my own quarter mile track set up for a place to tune my car and to see how adjustment effect my performance. I use a foot brake start when I'm looking at times and I really don't think there is a specific launch RPM That can be passed on , all cars must be different. You bring it to a point right below the rpm that creates wheel spin at start. I start with the transmission in 2nd and accelerate and add the nitrous right when it shifts to 2nd . I run the tack up to red line to shift to 3.rd manually.My nitrous is triggered by the horn ring on the steering wheel . I have a 2 gallon cell under the hood that has 105 octain in it and a separate high output , high pressure pump next to it. The car is so de-tuned -7 deg for nitrous that I run reg gas in it with no problem and can switch over to the cell by switches in the drivers compartment. That ability to run Reg. is a big big money saver. I'm sure there are better generic ways but that's my way. I'm highly concerned about the possible problems with nitrous above 150 shot . I think you have a free ride up to about 150.

vorteciroc

Please do not activate Nitrous-Oxide at low Engine Speeds...
Most likely a Nitrous-Oxide back-fire will occur and ruin you day.

89fast5oh

I wouldn't even give this guy a nickel's worth of free advice... according to him we are all scumbags and lowlifes and every other name in the book.

See for yourself https://www.thirdgen.org/forums/tech...ro-loaded.html

sofakingdom

iTrader: (1)

Agreed.

I forgot his uesrID. He's one of those people I have long since decided are logic- and advice-proof. I feel like an idiot (even more than my usual idiocy) for even replying to his post. After all, he knows EVERYTHING there is to know, he merely comes in here for validation of his great ideas (whether founded in fact or fantasy), superior position, and glory in the hot-rod world at large; and is looking for worship of his unspeakably ineffably exalted greatness.

That's OK, he'll eventually figure it out. I probably won't be a participant in that. Even though when he does, the REALITY I dosed him with, will be a bitter pill to swallow. Too bad. Not my problem. My car runs fine. Prolly will drill his at the next traffic light. No matter how much drivel he comes up with next.

Forgive me father for I have sinned. *mmmmmy father can beat your father at dominoes."

jbander

Bullshit hotrod , I went after another group on this form for doing the exact same thing and I even talked about it in this thread, Post 18. There is always a group of ugly people on these forums that you have to wade through to get to a answer. Like I said and made it clear .If one of these ugly craps on you and you just sit back and watch them, hoping for someone else to step in and answer your question , you are then making a big mistake. You have to come down on them or you will open the door for every ugly on the board to come after you , for being so dam stupid. and you will never get your answer. Just look at the next comment . There is a easy solution for them, simply just stay out of it. But ugly always wins the minds of these people. It's hard to fight. but everyone still should. This is the normal hater . He said That I said everyone here was a scum bag and lowlife . Didn't happen did it, I went after the *** holes and he was probably one of them and I thanked the people who helped me.

jbander

Go ahead and read the other thread here it is .https://www.thirdgen.org/forums/tech...ro-loaded.html You decide. Around every corner sits a turd, @sofakingdom @89fast5oh

Aaron R.

Ace...

89fast5oh

Here we go again with the attacks...and I wasn't even part of the original thread. My feelings are hurt so much. If only my car could do 7000 rpms at 150 mph. I'd probably be happy though.

jbander

Sofa guy" After all, he knows EVERYTHING there is to know, he merely comes in here for validation of his great ideas (whether founded in fact or fantasy), superior position, and glory in the hot-rod world at large; and is looking for worship of his unspeakably ineffably exalted greatness." Do you want to show a example of that. You can't find one instance anywhere, anytime of me being a know it all.. Like I said if you let one ugly go after you without saying anything . every ugly in the forum will be all over you , so much in fact that you will never get your answer. This is funny! Good entertainment.

jbander

Keep that good positive energy moving in the forum. You have some real dicks here.

vorteciroc

WOW!


Thank you for the Warning 89Fast5Oh.
I do not need that aggravation...
Maybe a Notice should be next, with that behavior.

jbander

Got a question for all of you cowboys, Should people get called out for being *** holes. That's all I did , Every ******* should be met with another *** hole telling them they are full of ****. suck it up and move on. You go ahead with your warning .This is a hoot! Banned for calling ******* *******s.

AaronIROCZ

iTrader: (5)

Well this thread went downhill fast, everybody cool off, this one is done.