97 Supra on E85 running Problems

Hello there, not to sure if this is the right place for this or not but here we go.

So I would take the vehicle back to the tuner but it's a 5-day drive away and that's not too realistic to do..lol It is a fresh motor built by the reputable shop who tune the vehicle made over a thousand horsepower on a dyno but when I got the vehicle home I started noticing some starting issues on e85. ( Which the vehicle was tuned on). It's a difference of 200 ft and elevation. I wouldn't think that would change it too much.

I thought It was a problem with the haltech ECU had an extra 2500 swapped it out, converted the file from ESP to NSP and the vehicle starts but will not restart when up to operateing temp till vehicle sits for 30 min then it starts fine. I sent the ECU running ESP out to haltech and there's nothing wrong with the ECU works completely fine.

I left the ecu running the NSP file in the vehicle till i got the other one back. With the NSP ecu the vehicle would have a long crank but would start.

i wonder if there is some kind of logic that the NSP has that the ESP doesn't have.. like if the NSP can reference the cam or crank sensor if the other goes out. i have no idea it is strange.

Once I received the ECU back from haltech installed it back in the vehicle. Same thing. Vehicle still will not start with the ECU running on the ESP file..

It has a haltech flex fuel sensor in it. I noticed on the main menu file for the fuel type it was set up for petrol and not flex fuel. Not too sure if that's a big difference or not.. All the other settings seem to be correct from what I can tell.

I feel like it may be a sensor problem with the vehicle and not necessarily the haltech 2500 itself, but I have no idea why it would run on the NSP map but not a ESP map.

Anybody's came across anything like this or have a idea for me to search that would be swell. Thanks for your time.

I haven't played with it myself but I have read in multiple places people introducing bugs/altered settings converting maps from ESP to NSP. You shouldn't need to physically take the car back unless something sounds mechanically broken. You shouldn't even need a live internet connection/remote access, just email the tuner the file and ask them to look over it.

I agree with Michael it sounds like something might be missed or altered in the conversion.

I also agree if you email the tuner they can likely resolve this via a revision or few by emailing files, unless you want to work on the tune yourself.

And it sounds like they perhaps tuned for e85 as a single fuel, rather than a flex fuel system, which can work fine as long as the ethanol content never varies.