Brettus Turbo install thread
11-30-2008, 02:13 AM
#204
my tuning was at night - a lot cooler . I was running into a misfire problem then as well so I turned down the boost till it came right . At the track It was maybe 10degC warmer and I don't think i had tested wot runs in 2nd gear which was where the biggest issues were .
12-01-2008, 12:57 AM
#215
Administrator
iTrader: (7)
oh **** Brett, that really sucks! Sorry to hear about the busted engine, hope you can get it fixed soon.
12-01-2008, 01:21 AM
#217
Registered
maybe we should combine our motor together lol it should work
my front housing with your front housing = one good engine.
that really sucks how you f***ed your seal ay. it was gr8 when you drove me on private road.
that pic is allsome
my front housing with your front housing = one good engine.
that really sucks how you f***ed your seal ay. it was gr8 when you drove me on private road.
that pic is allsome
Last edited by yushinrt; 12-01-2008 at 01:24 AM.
12-01-2008, 05:33 PM
#221
Here is a log from my track day showing wot through 3rd and fourth - just for you Swoope 
Only concerned with AFR under 100% throttle here
maximum MAF in 3rd was 310g/s @ 7200 rpm
Maximum exhaust temp 970 deg C
You can clearly see the spike from the AUX valve opening - circled
* Note how the spike changes position in the higher gear
*Also how the AFR gets richer in the higher gear
*In 2nd the afrs were even leaner
So The problems i was having as i remember it :
*I could feel a stumble in third gear as we went through the ports opening - not at all in higher gears
* In 2nd gear It was really bad
*When i opened the ports and went back to 7psi for one session all the problems dissappeared
*Next session after that I upped the boost again (ports still open) and that is the one that killed my motor .
* So the ports were open and i was still getting bad misfires in 2nd above about 6800
My conclusion about what killed it:
I think in 2nd gear (and 3rd to a lesser extent) I was running too lean for elevated boost levels . So I need to tune for around 11.5-12 afr in 2nd and the higher gears will take care of themselves .
Only concerned with AFR under 100% throttle here
maximum MAF in 3rd was 310g/s @ 7200 rpm
Maximum exhaust temp 970 deg C
You can clearly see the spike from the AUX valve opening - circled
* Note how the spike changes position in the higher gear
*Also how the AFR gets richer in the higher gear
*In 2nd the afrs were even leaner
So The problems i was having as i remember it :
*I could feel a stumble in third gear as we went through the ports opening - not at all in higher gears
* In 2nd gear It was really bad
*When i opened the ports and went back to 7psi for one session all the problems dissappeared
*Next session after that I upped the boost again (ports still open) and that is the one that killed my motor .
* So the ports were open and i was still getting bad misfires in 2nd above about 6800
My conclusion about what killed it:
I think in 2nd gear (and 3rd to a lesser extent) I was running too lean for elevated boost levels . So I need to tune for around 11.5-12 afr in 2nd and the higher gears will take care of themselves .
Last edited by Brettus; 12-01-2008 at 06:08 PM.
12-01-2008, 09:49 PM
#223
While down at the dealers to see about a rebuild I managed to wangle a drive in a 2009 .
My impression - soooooooooo slow I could hardly believe it . I'm positive even my NA would have creamed it . Handling felt more precise but than my 03 but overall the car felt more like a luxury car than a sports car .
My impression - soooooooooo slow I could hardly believe it . I'm positive even my NA would have creamed it . Handling felt more precise but than my 03 but overall the car felt more like a luxury car than a sports car .