I just recently installed an aux pump to support E85 for my 2009 ZR1.
I have been running the car on 93 pump dialed in to the best of my ability, ran awesome on 93. Or at least i thought. Its just a simple bolt on car with ID 1050x's
I put the fresh first tank of E85 into it and starting to have all kinds of problems.
When i stab the throttle to gear match, it stumbles rich and chokes it self, not a smooth ramp up in rpm. i tried to reduce some of the higher KPA area evap and impact factor transients for alcohol only and has been starting to help.
The BIG problem i am having is when i go WOT. the car stumbles real bad for a split second, like it cuts power completely, then full power comes back in abruptly and will continue a strong pull the rest of the rpm range. its just the initial stab of the pedal to where this is happening. it appears to be a S()(# ton of fuel that chokes the car judging by the snapshot below.
Other than that, torque is there and feels great driving around and running through the gears light and moderate throttle.
I feel like a noob again on tuning this thing. I feel like ive checked my ID1050X injector data many times and it seems to match up with what ID provides me.
But when i go to E85, all seems out of wack like its injector data or something?
As you can see in the snapshot below as i tip into WOT inj pulswidth will be fine until it hits this point of 36ms!! then come back to a sane level of around 14ms (where it should be) shortly after. thats the point to where i feel it stumble badly and pop back into power.
I thought maybe it was because of my FSCM tuning and affecting something with the secondary pump coming on. but i unplugged it and put the FSCM back to factory setting and still occuring.
Attached is the current tune file
any constructive help would be great. thanks!
BandV ZR1WORKING 2020 CURRENT BEST E85 fscm Working.hpt
wot stumble with high inj ms.PNG