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Old 03-26-2014, 06:43 PM   #1
BoboTheMonkey
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Member#: 224615
Join Date: Sep 2009
Chapter/Region: MWSOC
Location: La Crosse, WI
Vehicle:
2004 WRX
San Remo Red

News 04' VF34 WRX and E85 Tuned by RS Motors

Facility: RS Motors Burnsville, MN
Type of Dyno: Mustang
Baseline # for a stocker at the dyno: Unknown
Boost: 19.5 (gas) and 22 (E85)
Fuel: 91 Octane and E85
Target AFR: Unknown
SAE Corrections: None
Peak HP at RPM: 239 and 278
Peak Torque at RPM: 238 and 290
Mods:
VF34
HKS Hi-power catback
Perrin Catted DP
STI intercooler and Perrin hoses
DW 255lph fuel pump
Cobb SF intake
Grimmspeed Lightweight pulley
Grimmspeed EBCS
FIC 1100cc injectors

For reference, here is my old thread from stage 2 to VF34
http://forums.nasioc.com/forums/show....php?t=2426760

Just got this tune done today and I can say that I am soooo happy with it! I lost what seemed like a lot of daily drive-ability when I put on the VF. I loved the top end, but it seemed really boggy below 3000 rpm. NOT the case with this tune. Spool is instant and throttle response is incredible.This is a low reading heartbreaker dyno, so its more important to look at the gains, than what the final number is. 91 octane to E85 netted 37 horses and 55 ft/lbs! from my previous tune. (61HP and 98ft/lbs!!! from stage 2) The only other things that were changed were injectors and a lightweight pulley.

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Last edited by BoboTheMonkey; 03-26-2014 at 06:59 PM.
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Old 03-26-2014, 08:08 PM   #2
Back Road Runner
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It looks dead on for the 2.0L and fuel type on that dyno. Be happy with the torque. E85 is a great safe fuel to play with. Your biggest shortcoming will be the clutch, and this will limit the boost you can support with E85.
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Old 03-26-2014, 11:12 PM   #3
BoboTheMonkey
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2004 WRX
San Remo Red

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Yea, the clutch has 80k and does have a little slop. I don't expect it to last long... but it holds. I don't launch, so who knows. A couple hard launches and I'm sure it'll glaze and be done. great DD for now. I'll drive my S2K when it's down for the count.
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Old 03-27-2014, 03:03 AM   #4
subaru_gc8
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nice numbers i have a vf23 and have been contemplating taking the e85 jump
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Old 03-27-2014, 03:34 AM   #5
Back Road Runner
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The clutch will be fine up to the point it starts slipping on you. You'll notice this when you're on the highway, put your foot down, and reach peak boost. If you are running too much boost, aka too much torque, the clutch will start to slip a little. It will slip, grab, slip, grab. At this point, you need to start looking at a higher torque clutch. My understanding is the stock 5 speed clutch is good for around 300 wheel ft-lbs but not much more. Since you are running the 2.0L, you have a little more wiggle room versus the 2.5L users that start off with about 70 ft-lbs more off the same fuel. You're simply making up that difference running E85, so now your power band is much more like a 2.5L user on pump, although you'll get a little better top end HP due to the better hp per air volume. You're basically like a 2.5L owner running a good 91 octane tune, and the stock clutch will hold up to that just fine.

You won't really see glazing of any kind. If you do launch the car often, you will get some heat build up and some loss of bite. The clutch will fade some and slip more when hot. However, it won't glaze and will return to normal bite once it cools. You can't really wreck the clutch unless you're blatantly abusing it. Launching the car will be fine. Launch it at redline, I don't care. The clutch will be fine for a couple launches at least with no fuss.

You likely have some wiggle room for boost. 22psi is not exactly aggressive, but I don't know what RS was shooting for as a limit. I don't really know how durable the stock 2.0L internals are for this, so 22psi might be a safe setting prior to rebuilding and upgrading the insides for $$$.

Now start marking down where all the E85 gas stations are in the Cities. I'm not up there too often, but I've favorited one here and there in my nav so I know where to go and not run out of gas.

I should have my car out at RS soon to get an E85 baseline for my current 18G before a turbo swap. I have a 93 octane map from back when the engine was first rebuilt (previous owner). I have yet to get the car up on the dyno for E85. I have a rough idea with road logging, but it's always nice to get a true dyno history as the car gets modified.
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Old 03-27-2014, 03:42 AM   #6
Back Road Runner
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Quote:
Originally Posted by subaru_gc8 View Post
nice numbers i have a vf23 and have been contemplating taking the e85 jump
E85 is nice as long as it's readily available. Mileage will drop a small amount (3mpg myself, 20 to 17), but the lower cost actually saves you money in the long run. The hard part is you then need to find E85 stations anywhere you go. You could probably run poorly on pump gas if you need to, but your air/fuel will be off, and you'd have to keep off boost. It can be good to have a map for pump and a map for E85 available if you truly get stuck or are planning a cross country trip. Then it's just a matter of storing it and having a method to flash the other map if needed.
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Old 03-27-2014, 10:46 AM   #7
BoboTheMonkey
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Quote:
Originally Posted by Back Road Runner View Post
I have yet to get the car up on the dyno for E85. I have a rough idea with road logging, but it's always nice to get a true dyno history as the car gets modified.
^ Part of the reason I really wanted to make sure this got posted. I think a lot of people go a similar route with going stage 2 to VF and then they contemplate E85. Don't see a lot of 2.0's that have done this(with the 34, but the results would be similar on a 30/39/43). They are also getting older, so many people may not want to do it with the higher miles cars. Not a ton of 04's with only barely 80k on the clock. The one smart thing I should have done was to just get 750 or 850cc injectors to begin with. I will run maybe 50% duty cycle max on these injectors. Ron had recommended 750 and above, but said he has had great results with the 1100cc FIC. He tunes a ton of E85 cars, so I trust him. As for the clutch, I have had a vehicle that had a slipping clutch, so I'm pretty familiar there. When it dumps, I will go OEM or maybe at most a stage 1. I'd like my transmission to hold, so OEM may be the route I take.

Last edited by BoboTheMonkey; 03-27-2014 at 11:24 AM.
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Old 03-27-2014, 12:32 PM   #8
Nuke209
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The 2.0 and vf39/30/34/43/48 on e85 that I've tuned put out very similar numbers.

I would put in another OEM clutch and resurface the flywheel when it goes out.
Part # KSB03

cheap on amazon

The stock connecting rods in those motors aren't the beefiest lol.
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Old 03-27-2014, 01:04 PM   #9
BoboTheMonkey
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Join Date: Sep 2009
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Location: La Crosse, WI
Vehicle:
2004 WRX
San Remo Red

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Quote:
Originally Posted by Back Road Runner View Post
E85 is nice as long as it's readily available. Mileage will drop a small amount (3mpg myself, 20 to 17), but the lower cost actually saves you money in the long run. The hard part is you then need to find E85 stations anywhere you go. You could probably run poorly on pump gas if you need to, but your air/fuel will be off, and you'd have to keep off boost. It can be good to have a map for pump and a map for E85 available if you truly get stuck or are planning a cross country trip. Then it's just a matter of storing it and having a method to flash the other map if needed.
Yea, I have two stations in town and one by my parents place. I paid extra to get a gas tune as well. It's the lower one and it's very conservative. I can just flash with my accessport if I can't find any E85. Mpg dropped like you said like 3-4. Here they only sell recreational fuel with no ethanol for premium and it is currently 1.20 a gallon more. So even with the drop in mpg, I am still saving a little.
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Old 03-27-2014, 03:32 PM   #10
Subian
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The 2.0L that could

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Make sure you drain as much fuel out as you can before switching to another type of fuel. You'll still have 2-3 gallons in the tank when the gas light comes on.
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