Findin E85's knock thresh-hold

[turboglenn]

Well, while doing some tuning today i found out where E85 likes to knock ( at least in my car)

I brought the AFR's to 11.5 with alky injection on (M5 nozzle) So i turned alky off and wanted to make sure i would have some margin for safety if i ran out of juice. Well at 12.6:1 i got 2-3* timing pulled from only 1 cylinder, but the results were repeatable. Without an oscilliscope or hooking it's output to my ECU's spare loggin input i can't tell what jug it waws, but #3 tends to be the most knock happy (now clue why)

This mainly happened at and around the peak torque areas (4500 or so) and I would get all timing back by the time it hit 6k or so.

Not that any of this is important, but i know there's other tuners out there that may be interested in my findings ( at least since they were repeatable when tested) And so i thought i'd post it up for whoever may want to know.

As usuall i'l be playing with the tune for a while and posting results as i find them. I should add that it's in the 90's here right now with very high humidity (70%)

Intake temps were starting at around 111* during cruise and rising to a peak of 148* measured at the TB elbow. These temps are including using pre-turbo methanol/water mix through an M5 nozzle (pretty hot if you ask me *yikes*

Advice, input, thoughts, or questions...post em up or just read and go about your day..as i said, this is just for those interested in what i found, not really looking to "solve" anything

 

[bastard dsm]

well here is a vid of that teg i was talking about that ended up making 575hp
on a 255 and 1000cc injecters. im the guy in the camo sweater.

YouTube - Fatty Fab E85 GSR

 

[bastarddsm]

What kind of timing were your running? Whats your C/R. Are you running an intercooler?

I'm putting together a low budget E85 combo to see what happens. I got a n/t shortblock with a head cut like .050" so its about 9.5:1 - 10:1. I'm gonna run the factory ecu and 450's. But with a modded n/t fpr to get the bfp up to about 52psi.. That will make the injectors compensate for the extra fuel needed. I'm not looking to make big big power, but I think 300hp ought to be possible. Any thoughts glenn or bastard dsm?

 

[bastard dsm]

timing was 23deg and idc was high 80's, the 3 bar map was holding us back.
300hp on e85 with 450's might be possible but you will need all the boltons
and do your homework.

 

[TxR6guy]

Hows your Vr4 comming along? i dont see you posting on DallasDsm anymore.

 

[bastarddsm]

well we shall see soon as its back together...I'm amidst an AWD conversion... I think it might be possible. It should certainly make more power than a regulat low comression motor on 93. Its got a china evo 3 gt, and a 255.

 

[bastard dsm]

Hows your Vr4 comming along? i dont see you posting on DallasDsm anymore.

its still down, havnt been working on it ### im broke.