Guys that are running RC 1000cc with E85...

What are you running for scaling on E85?

Currently I am running 835 with 100 oct

I would imagine it would be down around 575 or so on E85? Is this thought correct?

 

You'll probably end up somewhere between 560-575.

 

Well filled up on E85 today.

So far the injectors are at 595 or so to get my cruise and idle trims in check.

Doing some more fiddling tonight.

 

How low was the gas gauge? Probably figure there was at least 0.5 gal of gasoline left, so next time you fill up, you're trims will be high by about 5%. I didn't fiddle too much until my second tank of E85.

 

Indeed, probably had a gallon or so of 100 still in there. I tried to burn it off but couldn't.

 

Pump E85 is E100 mixed down with 87 supposedly, and to be honest I dont know that its that good. It is greasy and not like gasoline, doesnt smell right, and very probably could be some oil base in there as well.

The difference is the E85 that we have mixed always uses good fuel stock since we mix it ourselves. I for instance am running E30-E35 right now, and now that I have my 1600s will be switching to straight E98.

When I mix E85 for tuning I will use 92 generally to mix with, but when I have mixed 87 from across the street it never ends up like pump E85. Our fabricator uses 109 unleaded when he mixes his

 

For the record, stock ECU by itself would not be able to idle and run 1600's. I put in FIC 1600s which if they are anything like the others are 160# (1680's) and you simply cannot run them at low enough IDC to get the car to consistently idle. I tried running it on O2 feedback by itself and that was no dice. I tried playing with all the settings I could find for the Ford Motorsports 160# and if it hadnt been for the MAFT Pro and the fact that I switched it to E85, I would have had to pull them out.

It was a fun experiment though.

My current settings with ECUflash on E85 are:

Scaling- 1392
11.7v- 1.23
14v- 1.096

I completely drained the tank and started over. As the car idle and worked out the trap fuel it seems to be getting better. I can start it up and have it idle at 14.0 pretty consistently with dips either way of almost a full point. It cruises where I have it set at 15.0, WOT is 11.5.

I havent logged IDC but i bet they are barely on the scope. I am waiting for the new big turbo to really put them to use. This was more an experiment for experiments sake than something I needed to or anyone probably really needs to. Its on a single HO pump, but would definitely have been better off on 1200's and a double pumper.

 

Two suggestions:

1) Have you thought about installing either AEM's or FJO's peak & hold injector driver system. Peak & hold offers better pulse width accuracy over the stock injector driver system (hybrid saturated system).

2) I might be able to help out with improving precision in pulse width by accessing the scaling in the ROM code that handles the minimum pulse width.

 

We were talking about that the other day for our fabricator TJ's CRX that is already out of fuel on 1600s and E85 with dual pumps. We werent sure how the AEM would integrate with the stock ECU. We use that on both of the racecars and it works great, but they are on AEMs as well.

We'll need to talk about the code, as thats something that might help with our other "project".

Thanks for the ideas

 

The peak & hold injector drivers are very simple to install. I've got one in my office that I'm going to use to test peak & hold injectors for FIC. There's power, ground, and then the injector pulse signal going to the resistor pack gets fed into the peak & hold driver box, and the four signal wires coming out of the peak & hold box go to the injectors.

 

okay i am new to this ecu flash world. I got ams 780cc injectors which are PTE injectors. My car then was tuned with a bov valve leak and a inner cooler pipe boost leak. my idle was great with my BC 272's . 850rpm. nice loop and always idled smooth. now cause of the new turbo xs bov and all boost leaks fixed my idle sucks. it will bog down to like 11psi vac. and like 12 and even 11 afr then kick back to normal 14.5 afr and 850 rpm and 14psi vac. then drop back down to 500 rpm 11psi vac and 12/11 afr. but my part throttle and full throttle afr haven't changed. I can e mail my map if anyone wants to look at it and a data log too. Does this sound like i need some idle afr/timing/injector adjustments?

 

Hrmm my FIC's 1050cc need a scaling of about 1040cc...

Seems a bit high - what could be causing the problem? potential vacuum leak??

 

Its not that far off from my value, but there is the one thing we talked about. That would affect one cylinder more than the others though.

 

oh the seating thing...

I looked at it again and they all look ok - I dont really wanna pull the rail of again /cry

 

I thought about it, and a leaky seal would cause the trims to go positive and thus require a lower scaling. So, even if one of the o-rings was leaking, it wouldn't explain what you are seeing.