Need some LT1 knowledge
Need some LT1 knowledge Ok you guys can see my current mods. The car just got fixed and they replaced the old pcm with a stock one. So my car doesn't realize I have 3.73's, a shift kit, and a stall. Easy driving is fine but everything screws up at WOT. It missfires, backfires, and bounces off the rev limiter. Now obviously I need a tune, but I'm REALLY dissapointed with the performance with the new addition of the stall and shift kit anyways. My question is this: Will the tune really help the car out that much? It seemed faster before when it was tuned with the 3.73's, now it has the shift kit and stall as well and seems to be running crappy AND slower. Will the tune help out a lot?? 
If its just when you shift then yes a tune would really help. Also are you experiencing a loss of traction with the new stall and gears? I know my z28 felt pretty quick with the 2.73's just beacues they hooked and went, after the gear change and countless other mods I spin 
.
. The car cannot grip for anything..LOL it's that bad (255's- BFG KDWS) Sometimes it backfires and missires right when I punch it, it does something funny and I'm not EXACTLY sure, but it prolly sticks around 6400 and bounces then shifts. I am just hoping my car is fucked up right now because I was hoping it would be stronger from a roll.
Originally Posted by Hark_Z
The car cannot grip for anything..LOL it's that bad (255's- BFG KDWS) Sometimes it backfires and missires right when I punch it, it does something funny and I'm not EXACTLY sure, but it prolly sticks around 6400 and bounces then shifts. I am just hoping my car is fucked up right now because I was hoping it would be stronger from a roll.
Well there is no reason your car should be seeing 6,400 rpm. That is a problem in its own. You need to go get your car programed for those gears.
Originally Posted by Camaroguy22
Well there is no reason your car should be seeing 6,400 rpm. That is a problem in its own. You need to go get your car programed for those gears.
EDIT: I am going to be shocked if you don't reach 1000 posts by next Friday.
LOL jk
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^I had to get my tranny fixed, no 1st and 4th gear, we traced it back to basically a bad PCM(which was already tuned) and we threw my buddies stock pcm in there and the car shifted fine so I stuck with it. Cant afford the tune yet.
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The PCM contains the shift tables (the shift tables control the shift points on a 4l60E and they're are calculated in MPH so having the wrong tables for your gear ratio will result in high engine speeds) a proper tune will definately help with your WOT shifting problem. I had the same problem when I went from 2.59 to 3.45. I hit the gas and was instantly on the rev limiter. It took me about 30 seconds to realize that I had to change my shift tables since a 65 MPH 1st to 2nd shift would no longer work due to the rear end swap. 
Mike
Mike
Yea, you definately need a tune. These things are real touchy. I got mine done, and it still needs to be tweaked with. It bounces off the rev limiter when it shifts. The shift point needs to be lowered.
Thanks for your replies. My car also wants to die at stop lights with the stall..It just starts shakin so I've been givin it some gas. My friend had a similar prob before his tune.
Originally Posted by Honda Hunter
Or the rev limiter needs to be raised. Real simple.
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If the tranny is sound then it should shift at whatever set and not bounce off the rev unless its spinning alot. Remember the tach on our cars arent accurate either.
Originally Posted by Camaroguy22
With a stock motor you would be actually slowing down your car if you shifted at 6,400. That is way past your ideal shiftpoint and your powerband.
Originally Posted by 1994Z28Lt1
yeah when i had my car dynoed peak power is at 5000-5100 rpm but it only lost like 4 hp all the way up to 5700 rpm thats where i always shift and it seems to do real well take a look at the link in my sig if you wanna take a look at the power band
You nailed that one!
