High or low ?

[powerdoctor]

I'm chasing a 1.5 yo around (my son)
I watch my boys every morning while the wife works...
sorry about the mess up , you know what I mean....

Later haters......

[JMo60]

sorry ben, you posted the same time i did

[JMo60]

12.5 :1 is richer than 15:1 FYI. an engine running an AFR of 15:1 under boost is gonna probably burn up, or at least not run well, and very hot

[SappySE107]

I have ran engines both way's and I prefer the high static comp, with the low boost, like a supercharger on an old sbc/ bbc.

The low end power issues below boost is what I hate....

I like a rich mix, about 15.1 for tuning for boost, some say 12.5/ 1 af is ideal...
Seems lean to me...

How the hell do you do this for a living when you don't even know 12.5:1 is rich and 15:1 is lean?

[powerdoctor]

I have ran engines both way's and I prefer the high static comp, with the low boost, like a supercharger on an old sbc/ bbc.

The low end power issues below boost is what I hate....

I like a rich mix, about 15.1 for tuning for boost, some say 12.5/ 1 af is ideal...
Seems lean to me...

[Z26-T]

Yeah, it depends on what you really want. If you don't mind some slight turbo lag while it's spooling to 10+ psi, then lower compression. But if you want power off the line (if you're not power braking/holding in the clutch) then stock compression with lower than 10 psi of boost. "idealy" you can put 10 psi to any engine, according to a few boost books, but you have be able to tune it, adjust your fuel pressure, and add more than what you can stock. And if you look in the "boost" section of this forum, there are other things you can do as well to help prevention of detonation (detonation is what basically blows up your engine). And most of the time, it starts to detonate at your higher rpms/boost, and by that time it's too late.

[IsaacHayes]

Depends probably on the end goal. But I have wondered too. I'd say for a street driven application, low boost (10psi and under), high compression (meaning stock N/A) since you'll have more power and response when the turbo is not spooled up yet.

[Z26-T]

lower compression with more boost, if u can tune it properly. Boost with high compression you start running into major detonation problems, and have to run more octane=tons more for fuel. (by high compression i mean 10+) (lower comp with higher boost id stick around 8.5) But it's just my opinion.

[powerdoctor]

Higher compression engines with low boost ...
Or lower compression and more boost ..... ?