Daytondakid13

I have a 2007 hr Z. And the mods I have are k&n drop in filters, berk test pipes, and hks rep exhaust. It's an auto as well, when I try to take off in the Z from a stop I has good low range and as soon as I hit around 2800 rpms the car like bogs/stalls down and as soon as I'm past it it pulls hard again. Is there anything I can do to get rid of that? I have a Cobb access port as well and I am running map 2+ and I sti have the bogging. Thanks.

waikiki35

iTrader: (1)

same here with short ram intake and test pipes... looking for answers too

RMichael

o2 sensor? hole in the test pipe? steel wool missing? sounds like test pipe issue. the ecm might still be adjusting fuel ratio for proper catalyst function.

Daytondakid13

Well I don't have any holes or steel wool in the test pipe I do have a cel from installing them that I just cleared with the Cobb I can also monitor my a/f ratios and it gets down to 10 sometimes at wot idk much about that and do not know if that's bad or not but when I get off after wot it goes directly to 20 so I'm thinking the lest the number the richer the car is running

Deteria

iTrader: (2)

Not sure if this would be the right solution for your problem, but my 07 HR Z had some bolt ons and I got my car UpRev tuned. Before, I had a dip in power due to running lean around 2500 and 3500 rpm and the tune fixed that so I now have a steady power increase all the way up the power band.

Perhaps this bogging you are experiencing is your car running lean around that rpm range.

j3tt2

Could be a knock sensor, I had the same problem when I installed my test pipes. Got my Cobb and figured out there wa a knock sensor throwing a code. I fixed the sensor and now pulling great all the way through. Check whatever code it was throwing and would suggest fixing it. Kay because you cleared it with the Cobb doesn't mean it's fixed

posteddtoasted

ive been having the same problem in my 07 and it started happening more since in put in my test pipes. does the problem happen more when the car is cold?

0jiggy0

iTrader: (13)

You need a tune. Happens to most hrs with test pipes and no tune.

Daytondakid13

I have a Cobb tuner is that not good enough?