E85 Tuning Question

[Randon_I_Am]

My cars going in to the dyno tomorrow for a "before" run and to get a nice base tune.

Then i'll be filling her up with "Flex Fuel" and doing a bit of self tune before i take it back to the dyno.

I can tune the AFR's no worries my self but just want a tip on the ignition timing...

I've read somewhere that some one chucked in 5degrees over the whole map and then fine tuned WOT.

What have you tuners out there done with E85?

Car in question is:

Rb25det NEO, should see somewhere around the 300rwkw mark.

Cheers Pat

[Randon_I_Am]

Should add running NIStune Ecu.

[JonnoHR31]

ideally you need some sort of dyno to find MBT, as your likely to reach that before it knocks, unlike ulp which almost always knocks before reaching MBT in turbo cars.

if you really wanna do it on the street you could keep doing runs on the exact same bit of road in the same gear and figure out what makes the most power in each area from how fast you move through that section of map (same way some programs give you a dyno graph from logging rpm vs speed), would be a bit sketchy tho.

the other thing that seams to affect timing with e85 a bit is AFR's, the richer you run it the more timing you need for the same result, as the mixture burns slower than a leaner mixture.

[Randon_I_Am]

I could do that, there is a nice empty out of the way piece of road that has been used for doing AFR's. I can also log the runs, I guess I would log TP(load), RPM, Injector duty cycle, and anythjing else...

But being seat of the pants dyno there's just too many things to look at, mainly the road infront...

I'm not looking to get it perfect, when i get it onto the dyno i can get it sweet there. Just want i little bit more untill then as I've read how good this jungle juice is.

Also I probably won't even be looking for more top end power, I'm really interested in getting more low down torque and boost response.

[JonnoHR31]

yer finishing it off on the dyno would be a good idea. its not really a seat of the pants dyno tho, if you throw in more timing everywhere and your run takes a full second less to get from speed x to speed y in the same conditions then your likely making more power, you'd simply do this for each cell, very time consuming and not ideal but it gives you an idea.

until the dyno just throw in a few degrees everywhere and go from there. you can be pretty agressive everywhere off full boost to get it nice and responsive. i'd keep it under 50 degrees on light load til on the dyno tho

[Randon_I_Am]

Cheers Jonno, advice is muchly appreciated.

There's actualy 2 cells in the Stock base map that are on 51, but they're on extremely light load and 3krpm-ish...

I'll concentrate on the mid part of the map where the values are ranging from 40 down to 20 or so.

Can't wait to get the juice in and running

[JonnoHR31]

yer stock map goes up to around 50 in a couple of spots, but with good fuel you can spread this out and go that high on a much larger area of the map.

for example, this is one of my maps running BP98, ignore all the cells with 10, they're not used

Edited October 24, 2010 by JonnoHR31

[STATUS]

does it feel steppy between P16 and P17 (N07 and N08) drops 20degrees in one cell. Pretty aggressive timing map.

[JonnoHR31]

like i said, all the cells with 10 arent used, ever

[DVS JEZ]

does it feel steppy between P16 and P17 (N07 and N08) drops 20degrees in one cell. Pretty aggressive timing map.

looks very aggressive, is that stock boost stock turbo tune? also is that with 98ron?

[JonnoHR31]

was sorta halfway through tuning after going from .82 gt30 on stock manifolded 25 to 1.06 TS gt30 30det. boost is around 22psi

[STATUS]

was sorta halfway through tuning after going from .82 gt30 on stock manifolded 25 to 1.06 TS gt30 30det. boost is around 22psi

Ahh that makes the difference. P16 is your real boost threshold then.