We have a lemons race this weekend and finished swapping over a z6 head onto our otherwise stock d16a6.

-92 Z6 Head swap
-RPM activated RPM controller wired to give + input to solenoid at 5000 RPMs

PROBLEMS >>>
-When the car is cold it idles and revs fine with excellent throttle response
-When the car is operating temp. it idles fine but throttle response is very poor in low RPMs
-At all times once the vtec controller activates our solenoid, the car bogs and RPMs drop below activation and shoot back to 5K activates and bogs (constant cycle)


So my question are for this race that we have this weekend.

-Can i run the car without vTec? I assume yes
-what would cause such a throtle response issue when the car is at operating temp

Any and all help is appreciated; we just want to go out and race!!

 

pics for attention lol

 

If it's running on the original ECU still that's probably the issue. It may have a difficult time adjusting A/F to an appropriate level for the non/VTEC and VTEC lobes, maybe it's completely out of it's operable compensation for the VTEC lobe and that's why it's doing that. Realistically, maybe it's your best bet to run it without VTEC since the race is tomorrow. I'd double check mechanical timing as well as ignition timing, adjust ignition timing to see if you can get it to run better/smoother. If not, I'd skip activating VTEC. Longevity seems to be the goal of these races anyway. Good luck!!

 

foregoing vtec activation as long as our motor would run properly would be fine by me..

were looking at an 18hr race over 2 days.. longevity is key lol!

what i dont understand is why a good handful of the swaps utilize the pm6 ecu with rpm controller? do i need to use the FPR off the Z6 head? i swapped to my a6 fpr cause the fuel line in was much larger

 

Seems fine when engine cold but not once warmed up?

Have you checked the ECT sensor? 94

 

The old school way to use the RPM activation along with an A6 ECU was to also use an adjustable FPR.
Far from perfect, but it would somewhat compensate for the additional fuel required when vtec engaged.