Reason I'm asking is because I got my head port and polished so I'm getting some more air into the engine, but do you think I need to adjust my fuel reg. to compensate for that or do you think it would be ok since it was rich to start off with???
Anyone got any A/F graphs of a stock gs-r???

 

You will only be getting a little more air in because you are still running stock cams. The difference will be minimal. When you upgrade cams (or go FI) is when you have to start worrying about leaning out.

And yes, I think they do run rich from the factory.

 

I think you would want to get at least an FPR.. and up the fuel pressure a little bit.

I dont' think they run rich from the factory and if you got a head job (no pun intended) you might want a little more fuel...

 

Most every car runs rich from the factory.

 

Yeah I got the B&M fuel reg. and I put it at about 45-46psi. Isn't stock about 43?????
Do you think I am doing more harm then good with changing this????

 

yea stock idle pressure is around 42-43. there really shouldnt be any problem except maybe some smoke and you're running your motor 'dirty'

 

they run rich up in the high revs....every tail a GSR in VTEC?

 

well the reason why hondas have low emissions and good gas mileage is cuz they a tuned to run lean from the factory. maybe not to the point where there can be problems, but that is how it is done.

 

adding fuel can be more benefit for emissions than running lean. running lean increases emissions more than running rich a lot of the time.

to answer your question, a gsr runs at a steady a/f ratio in the lowe rpms, and especially rich after the 2ndary intake runners open up. Dropping your fuel pressure 3psi will probably yield a 5whp gain somewhere in the upper rpms, and probably do nothing of signifigance down low.

-Sam

 

I was thinking, they probably run rich for a reason...cooling.

 

negative. they run rich for a reason: safety. If they ran on a precise lean point that optimized power, that doesn't apply to all weather conditions and gave no margin of error; honda awould have a lot more warrantied motors to tend to. By running the car on the safe side, it gives them some room for error if there is an extreme weather condition or any kind of mechanical disfunction. This same principal applies to speedometers. They naturally come from the factory a little faster than your actual speed... Immagine the number of angry customers honda would have if they tried to make every speedo 100% acurate and some came out showing your speed slower than you were really going. People would be getitng speeding tickets for times they thought they were going slower than they really were. This is the idea behind running slightly rich from the factory.

Cheers

Sam


[Modified by 94goldjungsr, 10:06 PM 8/1/2002]

 

So you think I should just keep it at stock pressure until I get some cams, and then this would be the time I up the pressure.
Or should I maybe lower it to about 40 or 41psi???

 

I say keep it stock.... 42-45. With just a PnP job, you shouldn't really need any more fuel than stock settings...