t/a98

iTrader: (6)

so i have a 98 trans am that just got a nice cam only ls3 what ive been wondering is how important is a tune? i know im leaving gobs of power on the table, but it seems like ive read alot lately saying the computer will learn out my changes and run fine after a few cycles, is this true? and please dont flame, i was fully intending on tuning it but from what ive heard it would be a waste especially since ill have to go out of state to get it done... the things ive read were minor changes like cam or headers, not entire motors, though...

sroach20

iTrader: (31)

did you change the reluctor or are you using an ls3 computer?

cabech984

iTrader: (11)

Youre going to be flowing alot more air with an LS3 over the 98 LS1. But you will be making the computer compensate for the massive amout of air. I would definately get it tuned

t/a98

iTrader: (6)

stock pcm, the crank was damaged, (bought long block for 1500) so i change to 24 tooth wheel and crank, i wouldnt mind a tune its just the, and quote, " car will run better without a tune"" comment i read on here once...

sroach20

iTrader: (31)

a 224 cam swap would be okay, but with that motor all i can say is good luck. if you do try it without a tune, get a video. no offense but i would love to see the carnage.

JonCR96Z

iTrader: (33)

It might not even run at all, much less run well.

t/a98

iTrader: (6)

cool i think ill get a tune then, hahah deff not trying to cheap out i think im at the 7 grand mark right now on the motor, if it wont control it then ill sit it on the dyno, i just wanted to know if it would run or not, thanks guys. When i said changed the crank out i meant i had the motor proffesionally rebuilt and they put a 24 tooth crank in and all the other fun stuff.

oh and there will be vids when its done, but ill do it the right way so hopefully no ka-boom vids,

brianfromhawaii

iTrader: (3)

It will start and hold idle assuming you did everything right, and it will drive, the long term fuel trims will adjust to the engine and try to make it work, do not do wide open throttle and you will be fine.

JonCR96Z

iTrader: (33)

It MAY start and hold idle. Don't assume something about someone's stuff that you know nothing about.

When it first crank it will be in open loop and won't be adjusting fuel for any reason. If you can keep it running long enough to get it past that it may hold idle, but everytime it shuts off it will start over with OL.

Best case scenario is that it will hold idle but it won't be a very clean idle. Driving is just about out of the question.

We have no idea what injectors this guy has, so even the PCM trying to correct with different injectors won't help.

sroach20

iTrader: (31)

i tuned my car for a cam only lq4 and after i swapped on some l92/ls3 heads my ve table was way off.

t/a98

iTrader: (6)

bosch gen 3 42 pounders, no worries though it wont be started untill its tuned,