Anybody having driveability issues with their cars using COBB 1000cc injectors? My car simply drives awful at low rpm's under load/when boosting. Low rpm roll-ons are really bad. Roll-ons above 3500rpm seem OK. The car runs crazy rich. The inside of my exhaust tips and my bumper are covered in soot. Cold starts are ridiculously rich .

Here are the mods and new parts I have:

K16 billets, IPD plenum, 997 Throttle body, new plugs & coils, COBB 1000cc injectors, COBB mafless Tune(car runs even worse with the MAF installed/tune), Wagner IC, 2.5" intake from 911 Tuning, Sachs 2.5 clutch, new 3.8 FPR, Replaced every possible vacuum check valve & solenoid. AMS waste gates, Standard issue billet DV's, new wheel speed sensors, new fuel filter, new boost sensor, N75 check valves...and probably more.

I've done a bunch of boost leak test...no leaks and absolutely no codes!!

Note: Car ran fine with previous stage 1 tune(basically stock car with tune)

I've been chasing this problems for over 6 months...

 

You need a retune. Tuning is most likely the issue.

 

Agreed, get your logs to a Cobb Protuner and they're straighten you out. Contact Sam @ByDesign

 

We have been trying to chase this gremlin for a while. Magoochi has been outstanding as far as patience and really trying everything. We have swapped tunes from car to car also and it's fine. I wish we had the car here. We will look over some more logs today with a fine toothed comb.

Hang in there bud!

 

Any chance you have a grounded injector?

 

1000cc injectors on 16gs???

 

No K16's with 68mm TiAL wheels. Like an A28. The ID1000's are just a great no-brainer for us. Could be anything I think it's a gremlin in there related to air. We will keep working on it.

 

Im still at 70% duty cycle on 80pounds injectors.

 

I feel you. Many tuners out there feel like these new injectors are better in every way and also allow the customer to move to ethanol with a pump upgrade. I've been pretty impressed with how flexible they are so it makes sense for me especially if it makes sense for Cobb.

 

magoochi,

I have 1000cc cobb injectors, and I'm early into the journey of dialing in my car. I'm working with Sam as well. I have A28 (early gen tial, GT28rs) turbo's, 3.8 bar FPR, fabspeed maxflo exhaust, and everything else stock.

I'm still on the initial mafless map from Sam. I've been slow to get him a full pull log.

Drivability seems 90%. There is some low speed vagueness, but I'll reserve full judgement until I iterate on a few maps.

It does seem moderately rich, but nothing to the degree you're suggesting.

What are your fuel trims at idle?

I would look into a possible exhaust leak pre-02 sensors. Perhaps it's introducing atmospheric air (oxygen) causing the closed loop feedback to add fuel unnecessarily.

 

First time someone has suggested an exhaust leak...I'll look into it. I don't know what my fuel trim is at idle. I have a Durametric coming in a few days perhaps I can check then.

 

I assume you're tuning via Cobb Accessport based on your earlier comments. If so, you already have the ability to see fuel trims live through the device.

You'll want to watch everything in the left column, for banks 1 and 2, to figure out which side is the problem:
Lambda, short term fuel trim, and long term fuel trim.

 

Im running Sambo k16 and COBB 1000 cc injectors. Car purrs like a kitten..

 

I have a set of 1000cc Bosch ev 14 injectors for sale if anyone need some. Same as cobb injectors.

 

My Lambda readings are at 14.6 for both sides. I haven't quite figured out how to look at the fuel trims yet using the COBB