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Old 02-19-2012, 11:51 PM   #1
eg33GC
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Default e85 G ecu development thread

I imagine some of you will find this very interesting and appealing.

So far, I have sucessfully converted my G to corn, using nothing more than romraider, logic, and time. I am going to use this thread to document and share my experience.

Equipment:
Stock maf
Apexi intake
cone filter
tdo5
255
PE 850s
D rails
tial mvs
HKS downpipe, straight 3" turbo back to 4" axle back
stock headers
custom ewg up pipe
forge bleeder valve
oem sti ic, splitter, sprayer
no bov
tb/iacv coolant bypasses
ngk v power plugs currently at .028
newage coils
E70 winter blend

I have about 40 miles on a preliminary testing, which has gone great for idling and low load cruising under 2500rpm. I am having issues with my wideband, forcing me to back off on adjusting wot/spool up afr, which happen to be somewhere in the 5:1 region... or 3 full afrs richer than what I want.
Keep in mind I am not scaling these 850s, I am simply modifying the fueling tables for 440s. This keeps unknown variables not defined in the ecu from changing.

Goals:
350whp on the td05. If rob can throw down 287 on pump internally gated, and 69360 can hit 12.5s, 350 externally gated and corn fed with aggression should be feasible.

Specs:
Base map-v2 sti ra 555 rom
Intended afr:
cruising: ~10-10.4 e85 AFR, or around 16:1 as displayed on a gas wideband, .85 lambda
spool up/ moderate load: 9.5-10 AFR e85
wot: 12.5-.8 afr, or 8.5 e85 afr
20psi on stock maf/map- this should be attainable with compensating the last tables the ecu reads past 18psi
high timing values, some up to 30* in high load/boost regions



This rom will be opensource. Meaning if you want to run this, you simply purchase a programmer, 27c1028s, and learn how to use romraider. I will not burn a copy for you uncompensated.

I must stress that this tune is going to be nowhere near the realm of safe or conservative. This is intended to feed my insatiable need to break things and push envelopes.

A big thanks to Paul Mugabi and Rob Files.
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Old 02-21-2012, 02:55 PM   #2
pmugabi
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Which wideband are you using? My LC-1 once ended up with a crazy multiplication factor on it. I had to do some kind of reset to get it working fine.

My initial thinking is that changing the injector scaling would allow the ECU to compensate better for the changes. I think that parameters like cold start enrichment and tip-in enrichment are probably based on the injector scaling. On the other hand all the tables that depend on load would have to be rescaled. I guess without testing we can't know which method works best.

It will be interesting to see if you get consistent AFRs using this approach.

Looking forward to your progress reports.
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Old 02-21-2012, 03:32 PM   #3
eg33GC
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I find that the car starts BETTER in cold weather. The cranking tables seem fine. The enrichment tables however... are terrible. I found the areas for them in the code, but I can't quite figure out how to make romraider create new def files without the .dtd files required. I tried duplicating your .dtd file with your defs but that did not want to work.

I am using an AEM wideband. It is not my first choice.

My sensor was located about 6 linear inches past the exducer. I think I just temporarily fouled it out with literally raw fuel (read 5:1 e85 afr).

The plan is to modify just the fuel cells first. It doesn't help I'm adding an effective 325cc AND switching to a fuel that demands 27-30% more fuel.

The worst part is feeling the car try to make power, but rich knocking from over fueling. It's trying so hard to kick ass
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Old 02-21-2012, 04:28 PM   #4
69subaru360
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You'll max out the MAF.

The rods, specifically the rod bolts, are not going to like that kind of power even if you keep it knock free and don't break a piston. I don't push stock subaru engines that I care about past 300 anymore, I've learned my lesson.
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Old 02-21-2012, 08:00 PM   #5
turboner
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^^Please see first post. He desires to push it to explosion.

I've found with e85 you can keep the spool values very lean but at WOT my cars loved tons of the corn. 10.8 is what the vette loves, while 11.3 seems to be the sweet spot for the dsm. This combined with slightly less aggressive timing I think will save that stock shortblock (hey it's working for the vette).

I wouldn't hesitate to try both though.
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Old 02-22-2012, 02:18 AM   #6
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Quote:
Originally Posted by eg33GC View Post
I find that the car starts BETTER in cold weather. The cranking tables seem fine. The enrichment tables however... are terrible. I found the areas for them in the code, but I can't quite figure out how to make romraider create new def files without the .dtd files required. I tried duplicating your .dtd file with your defs but that did not want to work.
Send me/post on the forum what info you've got on the enrichment tables and I should be able to get you Romraider defs for them.
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Old 02-22-2012, 12:39 PM   #7
eg33GC
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Quote:
Originally Posted by 69subaru360 View Post
You'll max out the MAF.

The rods, specifically the rod bolts, are not going to like that kind of power even if you keep it knock free and don't break a piston. I don't push stock subaru engines that I care about past 300 anymore, I've learned my lesson.
VE is only slightly changed by corn. The great thing is increased exhaust volume that counteracts the wastegate's affects on VE, and will also theoretically reduce the maf voltage's importance as the pressure goes up. That is the beauty of corn.
Worst case scenario? I sacrifice some peak power and richen the last referenced cells. 2 psi difference is only a handful of cfm on this turbo, and that is not going to be an issue.
Uk guys regularly put over 350 to the dyno rollers with PFCs on pump gas.

Last edited by eg33GC; 02-22-2012 at 12:50 PM.
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Old 02-22-2012, 01:45 PM   #8
69subaru360
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Quote:
Originally Posted by eg33GC View Post
VE is only slightly changed by corn. The great thing is increased exhaust volume that counteracts the wastegate's affects on VE, and will also theoretically reduce the maf voltage's importance as the pressure goes up. That is the beauty of corn.
Worst case scenario? I sacrifice some peak power and richen the last referenced cells. 2 psi difference is only a handful of cfm on this turbo, and that is not going to be an issue.
Uk guys regularly put over 350 to the dyno rollers with PFCs on pump gas.
That's CHP in the UK.

If you peg the MAF voltage too long you're going to get a cel and put it in limp mode.
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Old 02-22-2012, 02:09 PM   #9
eg33GC
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Engine dynos measure in chp.
They call bhp our whp.

Unless they go through the trouble of making the dyno convert a wheel power to a theoretical crank power..No.

At any rate, negative feedback stimulates me and makes this all the more worthwhile.Reminds me of when I was one of the first to put an h6 in the gc, so much naysaying back then
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Old 02-22-2012, 02:18 PM   #10
69subaru360
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When you see a UK posting online about power on a dyno it's CHP. That's what their dynos spit out over there and how they compare.
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Old 02-22-2012, 05:48 PM   #11
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I asked JGM tuning about that dissimilarity, and he noted it is equivalent to our whp.
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Old 02-24-2012, 07:05 PM   #12
eg33GC
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12psi on corn is faster than pump on 18 by a long shot.

3rd gear is absolutely brutal.

time to figure out my spark blowout at 20psi now.
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Old 02-27-2012, 09:02 PM   #13
sizzflair
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I might be jumping onto the E85 bandwagon since I'm running DW850s. Just gotta make sure the car is in good running shape with no leaks before I do Keep me updated!
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Old 02-27-2012, 09:07 PM   #14
eg33GC
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youre more than welcome to the current rom. great cruising mpg and rock solid idle, but the wot fueling isn't done.
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Old 02-27-2012, 09:17 PM   #15
sizzflair
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Thanks. I got a Hydra 2.6 that's going to be upgraded to 2.7 soon... once I do upgrade, I'll be getting a whole new tune.
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Old 02-28-2012, 04:12 PM   #16
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Register for dyno day at MAP...sometime near the end of April. I think everyone is going to be there. It'd be sweet to see your car do some pulls.
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Old 03-15-2012, 09:47 PM   #17
eg33GC
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refined the fuel tables.. off boost, slow driving feels much like a pump tune.
I feel the wall of torque will be detrimental though, but damn is it fun.
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Old 03-17-2012, 09:46 PM   #18
eg33GC
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now running an svx maf
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Old 03-18-2012, 12:54 AM   #19
69subaru360
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Quote:
Originally Posted by eg33GC View Post
now running an svx maf
Did you transfer the SVX maf scaling to the EJ20G rom or compensate some other way?
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Old 03-18-2012, 01:13 AM   #20
eg33GC
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both.

the difference in the piping that each are scaled are very different(obv). I added the raw code, then modified the actual scaling with the new maf scaling definitions I added in romraider with Paul's help.

Plan on doing the z32 next weekend. Then we are 20+psi bound for rod failure.

Current progress:
fuel trims for low load cruising are quite rich, about 14.5 gasoline afr
25 peak timing
17psi
7100 rev limit
also fighting a high 1200rpm idle.. won't lower itself. I suspect the tps should be adjusted, or I suppose a possible vac leak, however the gauge is rock solid at 20inhg
Very quick.
Going to do some logs comparing the green label maf and the blue label svx maf. I suspect the svx maf has a good amount of headroom.

Last edited by eg33GC; 03-18-2012 at 01:37 AM.
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Old 03-18-2012, 01:26 AM   #21
69subaru360
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Hmm I might be interested in trying that.
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Old 03-18-2012, 01:53 AM   #22
eg33GC
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fuel economy is 17mpg mixed, with lots of 2-3-4 to 100 wot pulls. This is with the car having issues interpreting load values.. the ecu should not calculate a 1-2* incline at 70mph at 10inhg as nearly 40% load.

I think just changing the maf on a rob tune would be great, although I can never ever recommend gasoline fuels to anyone :P
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Old 03-23-2012, 11:54 PM   #23
eg33GC
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just adding the new maf code without playing with the fuel tables was an utter fail.. the lc1 said 12:1 e85 afr at idle.. yikes.

so this weekend will allow some play time

hitting the 20mpg mixed driving mainly highway mark though

Last edited by eg33GC; 03-24-2012 at 03:29 AM.
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Old 04-10-2012, 05:18 PM   #24
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22mpg
car decides that it prefers to cruise at .9 lambda, it does not respond to any cruising fueling changes. so major mpg lost there, but I've countered it with loads of timing.

oh and what do we have here?
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Old 04-10-2012, 07:33 PM   #25
69subaru360
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What's your car weigh?

107 you're probably making like 270 at typical GC weight.
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