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Old 09-19-2008, 09:19 PM   #1
reddevil
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goes 12.387 @ 116.5

Default 20ish psi, E85 and 800cc injectors = .........

Well I found out how much 800cc injectors and E85 makes….

Not much.

The motor made a max of 288 whp/330ish torque @ 21 psi and ran out of injector @ 6000 rpm.

Turning the boost down to 19 psi was 265 whp with a moderately safe tune. But the MAF was hitting 5 volts with the piggyback adding in voltage up top….

This was done @ PRE on a DynoDynamics dyno. Sorry, neglected to get a dyno sheet. The torqe and power curves were good up until 5000-5500 rpm when I would start to degrade a bit. I was having some missing issues (we were pretty sure it wasnt det), and this could have been old sparkplugs. The AFR line was pretty damn ugly. "Safe" but ugly. The Walbro 255 just wasnt able to pump enough down low 4000-5000 rpm, then the fuel pressure would ramp up some due to the boost level, then the MAF would run out.

Since it may be awhile before I find (if ever) 1200cc sidefeeds, I am switching back to gas, as I have made 100+ more hp with the same setup.

Ah well, I just wanted to see what the injectors and E85 was good for, and now I know.
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Old 09-19-2008, 09:34 PM   #2
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time for a race gas+meth back and some insane twin charged numbers always imprezzife stuff from you
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Old 09-19-2008, 09:40 PM   #3
NickWRX
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Can you explain the MAF and how its almost maxing out? I had this happen with my v7ej205 and a zilla series super 16g on modded stock injectors.
My tuner said the MAF was maxed out and I have never really heard about that. And now that you have said something here in this post I was hoping you could explain it and how to fix it?! Thanks,

Oh and nice torque!!!!
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Old 09-19-2008, 10:13 PM   #4
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I think Red is running an EM system that scales the MAF 0-5V to correlate to 0-800cc flow for his injectors. He may not be reaching the physical limitations of the MAF the ECU makes it look like 5 volts and then it knows it needs 100% injector flow.

Red, feel free to jump in here and correct me but I think we've talked about this before.


Nick, the stock ECU and most of the high dollar standalones don't scale the injectors and MAF voltage together and most don't start maxing out the MAF physically until >20G size turbos unless they have head work and free flowing setups. What kind of EM do you have Nick?
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Old 09-19-2008, 10:16 PM   #5
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Why don't you switch to Topfeeds?
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Old 09-19-2008, 10:18 PM   #6
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I have seen huge #'s on E85 in comparsion to pump gas. I'm sure something was wrong with the state of tune or the tune of your motor (you can run more lean, in terms of lamba, than you do gasoline, and you can add a bit of timing back in too).

If I'm telling you things you already know, and you have messed with that, why not bump up the fuel pressure? I thought I have seen guys run fp's on walbro 255hp pumps pretty darn high (70/80/90 psi, I would have to search).
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Old 09-19-2008, 10:21 PM   #7
reddevil
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Kelly is correct, I am running a basic SMT6 (perfectpower6).

To switch to topfeeds, I would need different heads.
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Old 09-19-2008, 10:23 PM   #8
reddevil
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Its ALL in the ability to flow MOORRRREEEEE fuel.

I am able to make 400 whp on high octane gas, but because E85 requires 30% fuel to make the same power levels, I am limited by the max fuel that I can flow.

Now if I had larger injectors, say 1200cc, then I would be able to go OVER 400whp because I could turn up the boost AND not run out of fuel.
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Old 09-19-2008, 10:28 PM   #9
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Add another 255 in-tank.
example:the buscher double pumper setup.

Will give you a bit more headroom with the injectors you are running iirc.
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Old 09-19-2008, 10:37 PM   #10
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um maxing the maf is just that in the tube u have... the amount of air (the speed) is making the maf say 5v (the maximum voltage) if u had a larger tube, the air would be moving slower making the maf sensor send 3v volts..
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Old 09-19-2008, 10:44 PM   #11
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Its a modifed maf already. 400 whp was only about 4.8ish... premium plus torco.
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Old 09-19-2008, 10:52 PM   #12
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Is 1200cc all you're looking for or do you want some more headroom. I may have found somthing.
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Old 09-19-2008, 11:52 PM   #13
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Let me know what you find. I am gonna start having idle issues.
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Old 09-20-2008, 02:08 AM   #14
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Quote:
Originally Posted by reddevil View Post
Let me know what you find. I am gonna start having idle issues.

no problem
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Old 09-20-2008, 12:07 PM   #15
NickWRX
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Hey Kelly,

Thanks for the reply. I am running an Ecutek ecu. Its on a jdm
ej205 with a good amount of supporting mods. So what you are saying is, the ecu is basically "tricking" the car into thinking it is maxing out the MAF but in reality it isnt?

And Cquirki, you are saying to step up to a 70mm intake instead of my 65mm? Without looking I think thats what I have. An APS 65mm intake. My tuner suggested I go with a bigger intake and thus a bigger MAF. I just think its not necessary because so many other people are making much better numbers, running more than my 17psi with normal intakes, MAF's etc. Just not adding up here?
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Old 09-20-2008, 12:41 PM   #16
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NickWRX, what size are your injectors?
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Old 09-20-2008, 03:53 PM   #17
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maybe i missed it but what kind of turbo?
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Old 09-20-2008, 04:00 PM   #18
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something just seem's amiss here.

Red, what AFR is your target?
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Old 09-20-2008, 04:55 PM   #19
NickWRX
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modded stock wrx's = bout 810cc
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Old 09-20-2008, 06:34 PM   #20
reddevil
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Quote:
Originally Posted by modaddict View Post
something just seem's amiss here.

Red, what AFR is your target?

11.0 ish goal, but my AFR was 11.5-12
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Old 09-20-2008, 06:44 PM   #21
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sorry bro, I don't think it's going to happen on the injectors
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Old 09-20-2008, 07:07 PM   #22
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I think you did it wrong
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Old 09-22-2008, 11:45 AM   #23
thefoos
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turn up the fuel pressure...
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Old 09-22-2008, 02:19 PM   #24
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Quote:
Originally Posted by reddevil View Post
11.0 ish goal, but my AFR was 11.5-12
Uhh, you should be running around 7:1 with E85.
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Old 09-22-2008, 06:42 PM   #25
frdawg
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Quote:
Originally Posted by jblaine View Post
Uhh, you should be running around 7:1 with E85.
Not If he was reading on a display showing gasoline calibrated afr, he would need to do the E85 afr conversion as discussed in E85 sticky to get true E85 afr

Last edited by frdawg; 09-22-2008 at 07:14 PM.
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