I may have figured out my detnation and lean AFR problem..... - Page 2

The Rock 326 · 01-18-2006, 05:23 PM

Quote:

Originally Posted by tacbear

NO, you probably have the right one.

But I have the same problem you do.

Italian LX · 01-18-2006, 05:27 PM

Quote:

Originally Posted by The Rock 326

But I have the same problem you do.

You do?

The Rock 326 · 01-18-2006, 08:15 PM

Quote:

Originally Posted by Italian LX

You do?

Well, the going lean, and detonation part.

coupe · 01-18-2006, 09:34 PM

FWIW, I found some good prices on pumps, not Walbro, but seemed pretty decent upon inspection...and not loud at all in car.
I got a regular 255lph 5.0L, In-tank for $69.99

NightHawk756 · 01-19-2006, 05:23 AM

Quote:

Originally Posted by The Rock 326

Well, the going lean, and detonation part.

Your still having trouble Rich? Even after the last attempt to fix it??

QWKSNKE · 01-19-2006, 07:01 AM

Quote:

Originally Posted by The Rock 326

Well, the going lean, and detonation part.

So you have the right amount of fuel pressure but you are still going lean?

Sounds like you need another tune to richen it up

Wall96cobra · 01-19-2006, 07:22 AM

Quote:

Originally Posted by QWKSNKE

So you have the right amount of fuel pressure but you are still going lean?

Sounds like you need another tune to richen it up

that's what I was thinking, it may have been fine on the dyno but when the car is on the street it's under more of a load so you need more fuel.

Italian LX · 01-19-2006, 07:30 AM

Quote:

Originally Posted by Wall96cobra

that's what I was thinking, it may have been fine on the dyno but when the car is on the street it's under more of a load so you need more fuel.

Also, how high was your MAF voltage at the top of the pull? If it was anywhere near the max, then you could likely be pegging your MAF due to the colder air.

You're intake air on the dyno was likely warmer -- not only because of the general weather conditions, but also due to lack of circulation (especially if the doors are closed) -- the warmer air being less dense will register a lower voltage.

TheJeanyus · 01-19-2006, 07:48 AM

Quote:

Originally Posted by Italian LX

Also, how high was your MAF voltage at the top of the pull? If it was anywhere near the max, then you could likely be pegging your MAF due to the colder air.

You're intake air on the dyno was likely warmer -- not only because of the general weather conditions, but also due to lack of circulation (especially if the doors are closed) -- the warmer air being less dense will register a lower voltage.

That's what I was thinking, too.

Scothew · 01-19-2006, 07:55 AM

Yeah I am thinking Rich's car may be adding to much timing or the much denser air is the cause of it, cause most of the time he has the problem is to and from work, which is like 9pm at night and 7am in the morning, so its significantly colder than when the dyno was done.

If Doug takes 2 degree's out, I think he'll be close to set assuming his fuel pressure is fine.

01-18-2006, 09:34 PM	#14
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Re: I may have figured out my detnation and lean AFR problem..... FWIW, I found some good prices on pumps, not Walbro, but seemed pretty decent upon inspection...and not loud at all in car. I got a regular 255lph 5.0L, In-tank for $69.99 __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

01-19-2006, 07:55 AM	#20
Scothew Censored Jihad Join Date: Dec 2004 Location: B'ham, AL Posts: 4,108	Re: I may have figured out my detnation and lean AFR problem..... Yeah I am thinking Rich's car may be adding to much timing or the much denser air is the cause of it, cause most of the time he has the problem is to and from work, which is like 9pm at night and 7am in the morning, so its significantly colder than when the dyno was done. If Doug takes 2 degree's out, I think he'll be close to set assuming his fuel pressure is fine. __________________ Theres only one way to get to Carnegie Hall..... .... Practice.