Power drop off 33 GTST

[TeamKrazy]

i have attached a picture of my power run,

look at the drop in power from about 5500rpm to 6500rpm

does any body know wot is causing that.

i have a avcr running .85

fmic

3" turbo back

it holds boost perfectly thru the rev range

[Sydneykid]

My guess .....it's the standard ECU doing it's rich and retard thing. But check the plugs, particularly gap, as that can make the R&R worse when they start missfiring:cheers:

[Beer Baron]

no idea what is causing the huge dip in power, but I would look at getting it tuned as the AFR is bordering on being too lean (imo) up top at 12.6:1. Actually I'd look into why it's running that lean with stock ecu. possible fuel pump/reg/injector problem or possibly chipped ecu in your car that you are unaware of.

[TeamKrazy]

thanks and thanks

will check plugs

have a safc2 on the way so maybe that will sort it out.

[Mintie]

check ur cat too

[TeamKrazy]

check ur cat too

i have a special custom "hi flow" cat

[benm]

Throw on an exhaust cam gear before you do the powerfc. It tidied up my power curve nicely and for only about $250 fitted/tuned

[Steve]

another 2c worth,

make sure you only have 98 ron fuel in the tank, then disconnect the battery for about 5 seconds and reconnect it.

Also, when was the last time you changed your fuel filter?

[TeamKrazy]

fuel filter is good,

did a ecu reset the night before the dyno run as i had to get the boost all nice and sorted,

had all sorts of spiking issues.

[paulr33]

turn the boost down with stock ecu and those dips will go away

its just the factory boost cut at 0.80 bar ish

[TeamKrazy]

mite try that

thanks

[Steve]

I would love to know why your AF ratios are so lean, especially running stock ecu. It 'seems' like the ecu is pulling timing as the fuel leans out - which would make sense.

Boost cut sounds pretty good too, but why only at 6000rpm? peak torque is closer to 4000rpm.

For a stock ecu, it is making some good power.