Diy flash tune advice


New Member
Nov 28, 2019
Hi, i am new at flash tune, and need your help guys,

So, my hybrid turbo hot impeller side melted.
I am FBO, wmi, using the jb4 BEF, the problem is the afr map was targeting 13.5 afr... I think that contributed to high EGT.. I was shifting at 5800 rpm to achieve max turbo pressure.(100% wgdc all the time.)(23 psi max to [email protected])
Lowering it to 12.1 afr Will signicantly bring EGT down?
Should i limit wgdc to 85%? Will this help?
Our gas is really crap 86 octanes

The turbo use stock manifold with ps2 turbo dimensions.

Twisted Tuning

Platinum Vendor
Oct 25, 2016
New York
Assuming this is an N55 since you mentioned one hybrid turbo. The BEF you were using was targeting 13.5AFR at full load if pretty lean

You legit only have 86oct?


Jan 26, 2018
Houston, TX
13.5 AFR seems right for an Ethanol mix. Adjust your Fuel Maps (Bank 1 & 2) down as Omar suggests. Log your temps before and after.

This is what I've been running with an E20 ish mix of Ethanol.

The JB4 BEF for Pump values are okay and not 13.5 unless you are looking around 3000 rpm.


Oct 28, 2017
Monroe CT
I might be way off be it seems op is talking about the Brazilian “gasolina comum” in which case op is referring to different octane measuring units. Comum in Brazil is 87 IAD / 91 RON. It’s comparable to what’s referred to 91 octanes in the states but it’s E27.

Awesome info cause I knew some confusion had to be taking place and that is much better so a acn 91 would be safe map to start with for him than I would think
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