07 GT500, K&N CAI, Diablo K&N tune, feels like it's

[davenportmotorsports]

We have two customers with 07 GT500's. We've installed a K&N intake, and a Diablo with the latest K&N tune. Both cars are having the same problem.

When cruising under light throttle in a high gear, 4th or 5th, the car bucks, and feels like it has a miss. If you give the car more throttle, the buck/miss goes away. The cars run great under wide open throttle, or medium throttle, the only time we have a complaint is under light throttle.

Any suggestions?

Thank you.

[sohfast94]

Could you datalog this for me?

[davenportmotorsports]

Could you datalog this for me?

Both customers cars are gone. I'll check with my tech if he has a datatlog, though he's gone for the afternoon. I'll let you know on Monday.

Thanks for the quick response!!

[kmac1]

Did the cold air intakes come with any type of shield to block turbulent air from hitting the maf/filter assembly? We had the same issue a few years ago when we were testing the JLT kit. The kit they originally sent us was for flow bench testing and missing the shield. It would buck/jerk cruising down the road and would really get bad when a big truck would passby. Monitor the MafV while you are cruising and see how stable it is. It's more than likely the culprit.

Kevin@Diablo

[davenportmotorsports]

sohfast94 - Unfortunately our tech didn't save the datalog of the car. The customer lives out of town so I'll see what I can do about getting the car back.

kmac1 - The K&N kit did not come with a shield. The customer say's the bucking is bad when the hood starts to flutter, though we've found the buck/jerk is at it's worst when you are cruising at about 40 mph in 5th gear at light throttle.
Is the solution changing to a CAI with a shield, or can we fix this in the tuning?

Thanks for any help and advise, we really appreciate it!

[kmac1]

If you have verified its turbulent air hitting the Maf then a shield will be the only fix for that car. You could contact K&N to see if they have had the issue or if they have a fix. It would be ashame to have to change the CAI for this reason, I hope they have something for you or maybe you could make something...

Kevin@Diablo

[davenportmotorsports]

Checked with K&N they don't have a shield for the CAI. We tried a Steeda CAI with a shield on one of the cars. Problem solved!

Thanks for your help guys!!