gets pulled on by a 12.8 at 110 ls1 m6 at a a 30 roll till about 100 by a car when they both trap the same. please explain? the lt1 still has some power laying around on a better dyno tune than the mail order one im working off of now.

 

maybe your tranny didnt start off in a sweet spot........and with his m6 he could of had the rpms in just the perfect spot.

 

what exactly is "pulled on"??

was he behind you and caught up? was he even with you and passed you?

 

Gears maybe? Most M6 guys swap to 4.10's as one of the first few mods. That might account for some gain on a 30-100 run. But it was still a close race so you shouldn't feel too bad. He must have been one hell of a shifter to keep up with/slightly pull your auto. Any average driver would have fallen a car length behind you I would think.

 

i jumped out at first then he caught up and passed his car made 343rwhp and 350tq were mine made almost exactly the same.so is my car not running as strong or is it just that its a m6 ls1 from a roll.

 

you didn't race from a dead stop to a quarter mile. You are trying to compare apples and oranges. Lets say your car is a low end power maker and his is all top end. You get the jump on him and he has to play catch up the rest of the way. In a quarter mile he will never beat you because you crossed the traps at 12.3 sec and he crossed half a sec behind you. If both of you went to lets say 1/2 mile he would have caught up to you and probably passed you. If you start from a 30mph jump, you just lost your edge and he will get you every time. Everything is relative to how both cars are set up not just because you have better times in a quarter you should win no matter what.

 

so from a dead stop i win to 100 but at a roll his advantage and he wins to 100 just so hard to understand being that both cars make almost the same power on the dyno also i guess its m6 to a4!

 

look at your 1/8 mile mph on your timeslip and compare it to his 1/8 mile mph....most likely yours is higher and he makes up his ground on the top end.

 

all depends on how it is set up. You can race a pro stock dragster with 2000 hp against a monster truck with 2000 hp and the dragster will will everytime on the strip but the monster tuck will win everytime in the dirt.

 

i trapped 87mph through the 1/8. not sure what he trapped in the 1/8. just hard to understand the differences.

 

with an M6 he can select a gear that he knows will put him in the power band of RPM's and keep it there until he needs to shift, plus the M6 will keep you going in higher speeds due to the gears (a .50 ratio in 6th) when an A4 goes past the peak power of the engine.

also, a high level converter is mostly for take offs not racing at 100 MPH

 

The head design of the LS1 may have something to do with this as well. Since both cars here are on stock heads (I assume that to be accurate because I didn't see heads in your sig) then perhaps the LS1 peaking at higher RPM's helped give him the advantage since the race was from a roll and went to 100.

Stock LS1 heads flow 245 cmf vs 205 on the LT1. But that is not the real difference maker here IMO. What's more important to the top end is the LS1 heads are a 15 degree head vs the 23 degree on the LT1. This means the LS1 would give a near straight shot at the back of the intake valve. That allows the air to be less turbulent and less restricted on the LS1 vs the LT1. This in turn makes more power at higher RPM's.

Now if my memory serves me correctly (and correct me if I am wrong) the LS1 makes 345 tq @ 4400 rpms. But a LT1 makes it's peak torque at lower RPM's (325 @ 2500 I think but again correct me if I'm wrong). This would kind of explain why LT1's feel stronger down low and LS1's feel stronger on the highway. It could also partly explain why he could pull you a little at higher speeds even though you trap the same as he does.

By going from a 30 mph roll you erased the biggest advantage you have which is your awesome launching abilities (1.6's are very impressive). But even still he had to be a fantastic driver to pull that off. It was still a real good race from two strong F-bodies.

 

we do both have stock heads and i have a edge converter.so if the same ls1 had an a4 i bet it would be a lot closer hell he may not have caught me at all.i guess i need a better tune to start with and if that doesnt get me anymore topend i need some head work or a shot of gas. but really want a better tune some suspension and a better et before i add heads. some weight reduction maybe also want to get close to the 11.90s as possible before anymore motor mods.

 

Randy, looks like your set up is treating you well! What was the weather like when you ran those times? I'm sure that with a better tune and some suspension you should have no problem getting those times. Hopefully I will be getting into the 11s on May 21st.

It's funny because your best 60' is also my best 60'

 

Losing this race has nothing to do with motor differences when you both trap the same and everything to do with gearing.