types1967

i was on the road tonight and hit it wide open boost and she pinged alittle around 5200 rpm,i was told as temp drops i might need to increase fuel pressure so thats what im going to do tommorow!!!!!!!!! this was the coldest out all summer .i guess since the air is cooler it needs more fuel .i dont want to have this fu**in issue.damm im pissed

darrinb

so do u need higher octane or somethin??

types1967

i need to raise fuel pressure since cold air is denser and all summer it was around 75-95 but tonight as temp went down to 59 she started to detonate slightly and thats no good!!!!!!!!!!!

Roleez

It's most likely a slight dip in octane. When air is colder and thus denser, the combustion process is more complete/efficient. Case in point: I live in an area where days average in the low 60s to 70s, and nights are in the 40s-50s. Never once had a problem with knock/detonation on hard acceleration in these conditions. Try refueling w/ another brand of gasoline when you reach 1/4, or pour in a bottle of octane boost w/ the gas you normally use.

ModAddict

Yea Right, you're just trying to tell yourself "get the 3.5 upgrade"

ch1276

I think that is a great idea for you Eric

types1967

well ping is gone after a few gallons of 100

types1967

just raised fuel pressure to 72psi with vaccum pulled so that will do the trick

scalbert

Let me know how the FP adjustment works out for you once you refill.

types1967

will do steve i plan on running 94 octane and then we will see what happens and i can always add 100 octane maybe 3gallon increments to find the sweet spot

Smitty

you always seem to fix your own problems Eric.......

told you days ago, you had some bad gas... I know it is hard, but stick to the same Station and same pump that you always use..

mushutofu

Y would you want to raise your fuel pressure or mess around with that. Doesn't the computer compensate for the knocking with its knock sensor and retard the timing a little to prevent it. 59 degrees is not that cold. San Francisco 59deg is like having a warm day.. My engine doesn't knock.

scalbert

Do you have the supercharger??

The SC kit includes a rising rate regulator and by adjusting the gain you can increase the amount of fuel supplied under boost.

Yes, there is a knock control system but there are times it is lacking. After the VTEC change-over occurs on a boosted engine it goes leaner for a short period. Couple this with the greater timing being thrown at it and knock occurs sometimes.

mushutofu

So for a normal car(not supercharged) i don't have to worry about this right?

danny25

right

Smitty

I take it I will have to switch back to the STOCK temp stat when the weather drops..

JRock

That's weird, I always thought higher temps would lead to more chance of detonation. Hmm. I guess it makes sense though since colder the car runs stronger but that might put it closer to a lean condition.