Meissen's LT1 Build-up Thread

[Transamsfast]

reason being is that 87 octane is fine on these type of engines because the ignition timing is not set. it varies. one reason is due to the knock sensors. as it notices knock from fuel lighting to early(low octane) it de tunes the PCM to less timing which in terms = less hp,
i ran low octane most of my cars life and it was fine.

[SoulTerror]

100 pages!

[my95z28]

reason being is that 87 octane is fine on these type of engines because the ignition timing is not set. it varies. one reason is due to the knock sensors. as it notices knock from fuel lighting to early(low octane) it de tunes the PCM to less timing which in terms = less hp,
i ran low octane most of my cars life and it was fine.

Low CR? since when is 10.5:1 low. Not high for a modified car, but that is pretty high for a stock engine. Your manual says to run premium for a reason. And you really want knock going on it your engine? I know I sure as hell don't. Premiuem is only ~1.50 more per tank if you are completly empty, which you shouldn't be cause then you are starving your fuel pump. If you can't afford an extra 1.50 per tank, you should not be drving an fbody.

[MP81]

I can't wait to run premium! 10:1 CR and Boost.

[PWND3r]

I can't wait to run premium! 10:1 CR and Boost.

I have a story for you.


KA-BOOM!!! My buddy had an SS with forged 10:1 pistons, and rods, with a stage 4 kit and it went bye bye

[PWND3r]

Low CR? since when is 10.5:1 low. Not high for a modified car, but that is pretty high for a stock engine. Your manual says to run premium for a reason. And you really want knock going on it your engine? I know I sure as hell don't. Premiuem is only ~1.50 more per tank if you are completly empty, which you shouldn't be cause then you are starving your fuel pump. If you can't afford an extra 1.50 per tank, you should not be drving an fbody.

Thats a safety precaution. Our Lucerne CXS's, amd G8's say premium also.

I can run 94 on my Camaro without any problems. He should be fine.

[my95z28]

You are telling me that a 10.5:1 motor can run regular 87 octane and have zero timing retarded? I don't believe that for a second.

[MP81]

You are telling me that a 10.5:1 motor can run regular 87 octane and have zero timing retarded? I don't believe that for a second.

I have a story for you.


KA-BOOM!!! My buddy had an SS with forged 10:1 pistons, and rods, with a stage 4 kit and it went bye bye

I'm not running Stage 4.

[kammi10]

you do realize that blowers really like lower compression right

[MP81]

I'm not a retard.

The LSJ runs 9.5:1, I'm only at 10.

And YES it does work. Tons of people are running what I'll be running.

Back to Brian's thread...

[MunsterZ28]

im number 1000 in this thread . hmm my car is going to need a tune. do you have a specific date set B? might roll with you to watch steve do his thing, im positive hes going to be doing my car.

[98blackbeauty]

target to fire up is 3/28/2009. then on from there

[JoeliusZ28]

Low CR? since when is 10.5:1 low. Not high for a modified car, but that is pretty high for a stock engine.

agreed. 10.5:1 is about the most you see until you start looking at direct injection engines.

Brian will be fine running 87 octane but I really dont see why youd want to when a bottle of Octane booster is what, $5?? I wouldnt be "worried" about it but I wouldnt want to wait a full tank of gas before I could get the full performance of my car.

Also (I may be wrong on this) but I think the timing advance/retard is a short term multiplier. Therefore its not just going to detect knock once and thats it. It will be correcting itself constantly.

Is it going to hurt anything? No. ive driven my car untuned for 2000 miles. But its obvious the computer is always readusting its timing, just about everytime my throttle position makes a significant change. It doesnt "learn" and you wouldnt want it to, or you wouldnt get the performance back when you put premium in it.

[nascarnate326]

ive driven my car untuned for 2000 miles..

Speaking of that, when are you getting tuned?

[JoeliusZ28]

Speaking of that, when are you getting tuned?

when i get my wideband working properly this spring - or replace it altogether.