cas0484

Hello everyone, I'm new to the boards so please bear with me. I currently have a 1991 rs camaros and I just recently finished the 305-350 swap, while keeping the tbi. And all I can say is geez what a headache, not with the actual swap, but more with the results. The motor I got was from jasper,I'm not sure but I think it was a caprice motor so I'm assuming it's an lo5 however it very well could be an l98. However, it seems to really lack the power i was expecting. The motor itself is bone stock except for being bored .040 over. I switched the esc module as well as the knock sensor. I have the stock tbi with the vafpr and 65pph injectors. The motor seems to idle and run just fine except for a few problems. I recently have been throwing a code 43 which i think i fixed(i discovered that my base timing was retarted by 2 degrees so i bumped it up to 8 degrees advanced) I no longer get a code 43 and the motor seems to like the advanced timing. However the motor just doesnt seem that powerful, i mean its alot better than the lo3 but it still seems pretty slow. The best 0-60 i could pull off with my g-tech was 7.01 but i'm consistently running anywhere from 7.3 to 8.5. This just doesnt seem right. My friends stock 92 rs ran 8.3. Also, the car just doesnt pull hard above 35. I constantly get smoked by my friends 1995 non turbo 300zx I know that the lo5 isnt very performance oriented but does this seem right? From looking at my mods should I be running faster? I'm going crazy trying to get the car to run right. Oh, by the way i have an automatic and stock rear end. What could be my problem? Any input would be appreciated. Oh, one more thing, I got the stock intake manifold too. And the computer chip is a generic caprice cop car chip from tbichips.com Could I possibly need chip tuning? Please help!

vjo90RS8

iTrader: (1)

The stock L05 only has another 20HP and 35 lb-ft of torque over the L03, so you arnt going to feel a HUGE performance gain by just changing the motor. Also, the 65# injectors came on 9C1 police car engines that were upgraded to the L98 cam, so they might be alittle too much for an engine thats running the same cam as the L03.

BronYrAur

iTrader: (1)

I'd say you probably just don't have that much power with the LO5; I think a cam swap to something pretty decent but still somewhat mild and gears and posi would really wake that engine up and give you what you were expecting.

cas0484

well, the motor is a police car lo5, at least thats what jasper told me. But i'm assuming that it still wouldnt make that much of a difference. About the gears and posi, i'm saving up and hope to have it shortly after winter. Which would be better 3.73 or 3.42?

jase

Are you able to play with your fuel pressure any?That plus what everyone else is saying will help wake up tht engine.

BronYrAur

iTrader: (1)

I have 3.42's and I like them a lot but I also have a 5 speed so that may be a moot point if you're auto. Try to get Winaldl on a laptop and do some datalogs to see how its running (ie rich/lean). If it's a 9C1 lo5 then it should have an L98 cam already which isn't too bad but I would think that the stock swirl port heads and stock intake are holding it back the most. If you have the money to get some aftermarket heads you could see the engine's real potential.

If I were in your position, stock heads and intake, I would get a set of vortec heads and the matching vortec intake. That combo is pretty cheap and since you would need a new intake anyways its not that bad to have to buy the vortec one. That combo would be a great bang for the buck and really wake up that engine as long as you can properly tune the chip for it.

cas0484

well, as far as fuel pressure goes, i have the vafpr hooked up but thats about it. I dont have a fuel pressure gauge yet so i'm in the dark about what fuel pressure i'm actually running. As far as the heads and intake go, i'm almost positive they'd void my nice warranty so they'll have to wait for now. I guess i'll just build around the motor for the time being with gears and posi. Do you think a transgo shift kit would help any? Would it lower my 0-60 or 1/4 mile times at all? Thanks alot for all the help, I've learned so much from these boards and appreciate any input.

TechSmurf

I don't think you understand how serious we are about the laptop.. go to http://w1.601.telia.com/~u60113744/s...dl/winaldl.htm or search the TBI forum for WinALDL.

The software is free, designed by a fellow TBI guy.. (well, crossfire corvette guy, but he quickly expanded it to cover just about every GM TBI available plus a bunch of non-TBI stuff).. the cable costs about 5 bucks, all parts available from radio shack, you can use speaker wire for the leads from the serial port adapter to the ALDL... most everything ix explained on the site.. and it'll tell you if you need to raise/lower your fuel pressure based on feedback from your car instead of blind tuning the fuel pressure (even if you did know the pressure, you'd want this to be sure your car is happy with it)

BronYrAur

iTrader: (1)

Are you running the Vafpr with the spring that it came with? I thought that was quite a stiff spring and would supply a large amount of pressure (correct me if I'm wrong guys, I don't actually have one). If that is the case I would replace the spring in there with the stock spring from your 305 regulator. If you have 65 lb injectors and a lot of fuel pressure being supplied with that regulator you could be running rich, but again you won't know for sure without a laptop or reading plugs or some way of telling if you are rich or lean.

vjo90RS8

iTrader: (1)

yeah, what he said, you might want to use this spring
http://www.top-downsolutions.com/pro...products_id=39
and the vacuum delay valve that he sells.

cas0484

well, i downloaded winaldl and my aldl cable is on the way so hopefully i'll have some nice datalogs soon. As for the vafpr, i'm still using the stock spring, so I guess i'll have to order that different spring. How exactly do you replace the spring? I remember hearing somewhere that you're not supposed to disassemble the regulator part for some reason. As soon as i get my winaldl up and running i'll be sure to post some of the datalogs, hopefully I can squeeze a little more power out of this motor with some tuning.

seanof30306

iTrader: (4)

click on the "top down solutions" link at the top of the page. lon sells the spring you need.

look around for a chassis dyno in your area. a dyno pull with a wideband 02 sensor will tell you where your air/fuel ratio is and let you make fuel pressure adjustments till it's right.

92rsv8

the 300zx non turbo runs like a 7.0 0-60 and a 15.7 1/4 mile so you will need a little more than a 20 hp increase!!! 300zx 222 hp 3200 pounds.
you need more power to weight ratio!!!

BronYrAur

iTrader: (1)

He should be able to run way better than a 15.7 with that combo I think. It just needs to be tuned right! It's easy to take apart the fuel pressure regulator just a few torx screws, the only reasons some things say caution not to open it is because that spring is under pressure and you have to be careful not to let it come out when you open it. Any 350, especially if this has an L98 cam should run way better than a 15.7. I can almost guarantee my stock 305 5-speed car will run low 15's.

ONEFINE8T9

i agree.....

92rsv8

stock 305 5 spd ran a 15.9 according to car and driver or road and track???? and those are good drivers!

Ronny

iTrader: (1)

yea the spring(orange) that comes with the vafpr is ridiculously too strong. i would try the one that came with car originally or try lon's spring. lons is a bit stronger than stock($15). i think the vafpr was used in marine applications 502 cid with 90 lb injectors. is that correct ?????

BronYrAur

iTrader: (1)

I'm not making any rock solid claims because I only had one chance to get to the track over the summer and when I got there it started raining so I never ran it. All I know is I ran with 3 third gens on an empty highway. We came to a stop and went, two were TPI 305's and the other I think was an L69 all autos. My car kept with them the whole time and started pulling on one of the TPI cars. The two TPI guys had run their cars at the track a week prior and both ran consistent 15.1's. This was also before I put in the 3.42 rear with posi, advanced timing 6*, upped fuel pressure a small amount, and got new Z-rated tires all around on the 16x8's. So that is where I get the guesstimate that I'm in low 15's.

sqzbox

If your running an in-tank fuel pump, better check it's pressure before you do anything else! Just 7 or 8 lbs of pressure will rob you of more power than stuffing potatoes up your exaust pipes!
you need 13 to go!!

seanof30306

iTrader: (4)

dude, i don't think there's any way your car is that fast. check the sig ... our setups are very similar. the times i'm getting are very similar to what others are getting with similar mods. before the 3.42 posi, i ran a best og 16.59. after best 15.94.

it works out that way on paper, too. i plugged my horsepower and vehicle weight into a 1/4 mile calculator and got almost the exact same times/mph i'm running.

the tpis are going to be faster, too. they made 20+hp more than you from the factory. if they're anywhere near stock, though, they aren't going to be any faster than 15.5 - 15.6.

BronYrAur

iTrader: (1)

All I'm stating is the events I witnessed. They ran their TPI cars at a drag strip and pulled bests of 15.1's a couple times I believe. Shortly after that I hung with them on the highway, simply stating what I did. My car is in perfect shape and perfect tune with about 60k miles on it. To keep up with them I was shifting without coming off the gas at about 5k each gear.

Again, don't take this as rock solid evidence. Once I go to the track hopefully early spring (my car is off the insurance and stored now and I'm not sure when I'll put it back on) then I can tell everyone what it truly does run, I'm just predicting here.

cas0484

thanks for all the advice guys. i am running into a bit of a problem though. With the vafpr i'm getting a code 44 lean exhaust at idle. According to my air/fuel ratio gauge it drops off the chart at an idle but at crusing speeds and wot it's pretty much stoich and a little rich at wot. It only seems to throw the code at idle and goes away as soon as the gauge reads back to normal. What could be the problem? I'm using the stock spring that came with it, if it's supposed to be so stiff then why am i running lean? I have a new o2 sensor. I do know that I have a hefty exhaust leak near the converter, could this be the source of my problem? I have tried running the car with the old regulator, the vafpr both hooked up to vacuum and not and I can't tell which is doing the most good. I guess it's time to invest in a fuel pressure gauge huh? I just replaced the fuel pump so hopefully that isnt the problem. Any ideas?

cas0484

thanks for all the advice guys. i am running into a bit of a problem though. With the vafpr i'm getting a code 44 lean exhaust at idle. According to my air/fuel ratio gauge it drops off the chart at an idle but at crusing speeds and wot it's pretty much stoich and a little rich at wot. It only seems to throw the code at idle and goes away as soon as the gauge reads back to normal. What could be the problem? I'm using the stock spring that came with it, if it's supposed to be so stiff then why am i running lean? I have a new o2 sensor. I do know that I have a hefty exhaust leak near the converter, could this be the source of my problem? I have tried running the car with the old regulator, the vafpr both hooked up to vacuum and not and I can't tell which is doing the most good. I guess it's time to invest in a fuel pressure gauge huh? I just replaced the fuel pump so hopefully that isnt the problem. Any ideas?

ONEFINE8T9

i know the 5.0 tpi is capable of better than a 15.6, speaking for myself atleast, my 85 trans am has the HO tpi with the l98 cam 4 bolt wide mouth exahaust and the factory 3.27 BW 9 bolt posi and i smoke by buddies 5.0 tpi Z who ran a best of 15.2 on his g tech consistantly, i also have a 5.0 tbi 5 spd 25th RS and while it dont run near my TA its deffinetly capable of mid to high 15s with a good driver

Ronny

iTrader: (1)

yes the exact same thing happened to me ! check engine light came on at city driving 20-30 mph for about 8 miles. stop and go traffic light to light. code was lean. i was running the 65 lb with vafpr at about 12 lbs. i had stock ecu and was not yet datalogging. i had about one month on engine with mods. at that time i decided to remove the vafpr and add 7747 and add 90 lb injectors. that fixed the CE light and never came back on. i suppose i could have added more FP but did not feel the 65's could suply enough fuel. that plus a stuble made me go 90's with 7747. hello tuning.

splitpeas

hey man you gotta get it right my time was 7.94 not 8.30 lol but oh well im wont hold you to that but i gotta do something about my motor and the damn Canadian tag? but its cool were running jps cars this thurs

IROCaholic

Alright number 1. with your 0-60 times you should be running mid to low 15's. 2. you said you had a "hefty" exhuast leak at the cat, I lost .3 seconds off my quarter with an exhuast leak right before the pipe I have that replaced my cat , so I would get that fixed if I were you. Your really not running that bad of times. I have a 350 out of a 90's chevy truck in my car and when it was pretty much stock I was running 15.3's , so your not off terribly. Get that leak fixed and slap on some vortec heads and a good intake and youll be running alot better. Good Luck.

rsilver

My $.02. there was a lot of debate on some old threads on the lo5 engine and the swirl port heads. Check into those, but I think you will find that you are pretty limited with a stock LO5. I am sure you can probably do better than right now with tuning, but the stock cop chip is pretty good for that engine. I started with it as a base for my custome chip.The cam specs are also very weak.

I would spend the $ for a set of vortech heads or go to a local head shop and see if you can trade your new heads for a set of better used ones. I forget which casting #'s but there a lots of posts on this and if you shop around and find a buyer for the new lo5's its economical. Then add a used lt1 cam, and you will pick up a lot. Its a pain for a new motor, but for what you are looking for, your gonna have to do it.Good luck.............bob

rsilver

I forgot to add this, but my motor is based on the lo5, I just put the lt1