djm_e22

iTrader: (2)

Alright I plan on buying another PCM to use specifically for drag racing with high octane fuel. I only want to dynotune once due to pricing. So since I will be using 110 octane and be able to advance timing will I get any noticable gains over normal timing with le1 heads and a 306 cam all motor? Compression is around 11:1 Thanks for any help.

ss.slp.ls1

iTrader: (36)

Why not just dyno tune it and leave it at that? 11:1 should be fine on premium octane pump gas, no need for race gas.

djm_e22

iTrader: (2)

It is already tuned by pcmforless. But if I can get more horses out of it with advanced timing with 110 octane I'll do it. I'd have one PCM for the street and the other for dragging.

djm_e22

iTrader: (2)

Or is advancing the timing only worth it if my compression was raised?

ss.slp.ls1

iTrader: (36)

I'm not a tuner, but it seems like a lot of hassle for minimal gains.

slick1851

This thread fails

djm_e22

iTrader: (2)

Dang, I feel embarrassed. I really thought two points to high octane was being able to raise the compression and advance the timing which I thought both effected horsepower. Correct me if I'm wrong.

ss.slp.ls1

iTrader: (36)

You can't change your compression. You build your engine with a desired compression ratio. Then your compression ratio will dictate your octane requirements. A dyno tune will optimize your timing and A/F ratio throughout your powerband.

mdacton

iTrader: (3)

it can help if things are inefficient.

there is no need at all to run 110 in anything like that, and since your engine does not NEED it, it will slow you down.

You can probly pick up a bit from a good tune on the dyno from what you have stated you have now. just adding timing and compression does not equal more power. It may sometimes, not on everything.

I have seen cars where you pull total timing out and it did not lose anything, have seen other where 1 degree loses 25hp.

Puck

iTrader: (17)

You don't need 110oct for an 11:1cr 306 build. Remember that higher octane makes LESS power unless it allows you to run timing that would detonate at higher compression ratios. 11:1 is low compression for an LTX, and 306 is a lazy cam lowering effective CR even more and would probably perform just as good on 93 as 110.

Race gas won't make you much faster unless you need it.

djm_e22

iTrader: (2)

That helps alot. Thanks a bunch!!!

7.0 camaro

ive done it. didnt see no gain. i run it for nitrous. but thats it. i have my timing at 40. i have 11-1 and a 306. hope this helps

djm_e22

iTrader: (2)

I know you can't change it. I meant the advantage of high octane is being able to run a high compression engine. Sorry for the confusion.

maddog05

With the car on the dyno you can watch your tuner gradually adjust the many variables. As he tweeks the timing there will be HP and Torque gains with timing advances. As he continue the gains get smller and the engine noise will be perceived by the ecm as knock. then it will retard the ignition timing automatically. YOUR MAX GAINS WILL BE WHEN YOU DESENSITIZE THE Knock MODULE WITH A REISTER OR A complete LT4 SET UP- LT4 SENSOR + module. We are talkng very small. but important gains. Make sure the MAF is clean, the injectors are 30 lbs or slightly more and getting plenty of cold air.