now I don't know if there's an actual correct answer to this, because I know a lot "just depends" on the setup, but in general (if there's a such thing), if you raise compression in a GSR motor to 11.5-12:1 and keep a stock GSR ecu in there, what happens to the A/F ratio? I'm assuming it can only do 2 things, either run leaner or run richer. Which is it?

 

anyone?

 

alright please do a search i see stuff about a/f ratio all the time search and search arcives

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xplanetearth420x &raquo;</TD></TR><TR><TD CLASS="quote">alright please do a search i see stuff about a/f ratio all the time search and search arcives</TD></TR></TABLE>

thanks for the reply, but I actually searched the archives and couldn't find the answer to my question. most of those posts ask about tuning they're a/f ratio, where i'm technically asking a non-tuned a/f ratio question.

 

I would be interested in this, too. I am increasing the compression in my F22 to 11:1 and (initially) will be using stock ECU with stock a/f maps. Anyone know the impact?

 

tuning pro's, where ya at?

 

someone's gotta know!

 

i was wondering this also

 

Well, I'm not an expert, but I'll take a shot and hopefully an expert will correct my errors.

An engine with a higher compression ratio is more efficient and therefore it should require less fuel to produce power.

However, when you increase compression, you also increase the density of the air/fuel mixture, and combustion speed, and lower the vacuum in the cylinder, which should result in a richer fuel mixture.