Dyno Sheet Afrs

[Xrfranjo]

Hey All,

I participated in yesturdays Chrylser dyno day at Micks in Greenacre and found the car to be down on power... I am unsure about the AFRs, can anyone tell me what it is supposed to be or is this normal under full load..

I came third too..

dyno 22-5-11.pdf

[Xrfranjo]

maybe its time for a retune

[Ralph Wiggum]

How much boost? Peak AFR's of 12.3/12.3 aint "bad" as such. I would prefer a little richer (11.8ish) but theres alot of other factors.

Afr's look a little laggy coming onto boost but this could be the technique the tuner used to load it up on the dyno.

[discostig]

Frank: as Tocchi says, "save fuel, tune lean!"

Edit: mine starts in the high 13's at 2400RPM but quickly dips to high 12's at 2800RPM then remains till 3300RPM. From then it descends to just at the top of the 11's from 3700RPM on. I didn't ask him to lean on it hard for mine, I enjoy power and some element of reliability.

Edited 23/05/11 01:13 PM by -SteveR-

[RAP1D]

That is getting a touch lean mate... prob a fuel system issue rather than tune, as I'd say it was tuned fatter than mid 12s

Check the main fuel filter, fuel pump(s) and intank filter... if the fuel system isn't performing as well as it was when tuned, fuel pressure can be lower, so the car may run leaner.

[Xrfranjo]

Thanks guys.... 15PSI, I have walbro and surge with bosch 044... im thinking maybe fuel filter

it is due for a retune in june july as im putting new exhuast on.

I will let every one know the result

[freeze_dk]

Doesn't look as bad as this car on eBay

[Xrfranjo]

OMG....