B8 S4 GIAC Stage 2 E85/93 mix

[sonic32]

I recently had a somewhat lengthy convo with somebody from GIAC and I was reassured the race map was tested with a mix of e85/93 of around E30. I have been testing mixed up to E40 on my car. I have stage 2 GIAC software, roc Euro intake and a bw smaller pulley. I have had different results with the mixes but one thing was consistent that I'm not happy with and that's the sputter on cold starts. It sounds like the car is about to die before it starts on cold starts. I changed my plugs thinking it had something to do with it but it doesn't.
I have gotten lean codes with more than E38 and sometimes misfires before the new plugs. The gas station I get e85 from went from E82 to E88 tested by me, which messed up my mix a little bit.
I was wondering if people would like to share their exact mixes and results and if anybody has this sputter on cold starts.
Also car dyno'ed at 381whp and 345wtq on the race map with 5.9gal e85 and the rest 93. I got lean codes that day and pulled logs and they didn't look too good which leads me to believe that a little too much e85 was added and I could've had more power if the mix was good.
Thank you!


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[S4M3]

what dyno?

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[CELison]

I keep mine at E38. Got misfire codes once. No lean codes. No sputtering on cold starts. Never been on a dyno but your numbers seem low. I did pulls with a b5 that was running 3 sec FATS which is the same as my b5 was running when it made 410awhp on AWE's Mustang dyno. That car beat me by about 2 cars from 40-140. Video is on here.

[sonic32]

what dyno?

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A mustang dyno. On the same dyno an rs5 put down 327whp and 280wtq and a '15 M3 with bolt ons and tune/jb4 390whp.

[sonic32]

I keep mine at E38. Got misfire codes once. No lean codes. No sputtering on cold starts. Never been on a dyno but your numbers seem low. I did pulls with a b5 that was running 3 sec FATS which is the same as my b5 was running when it made 410awhp on AWE's Mustang dyno. That car beat me by about 2 cars from 40-140. Video is on here.

If yours is DSG it can have a lot to do with you keeping up with that b5 s4.

I was hoping to break 400whp on that set up but like I said I think the mix was a little too much. If you don't have an ethanol sensor or didn't test the e85 in not quite sure how you got exactly e38. I've been playing with a lot of mixes. Best mix log wise was on the pump map with 2 gallons of e85 and 10 93 and it corrected the knock correction I was getting with only 93.

[CELison]

If yours is DSG it can have a lot to do with you keeping up with that b5 s4.

I was hoping to break 400whp on that set up but like I said I think the mix was a little too much. If you don't have an ethanol sensor or didn't test the e85 in not quite sure how you got exactly e38. I've been playing with a lot of mixes. Best mix log wise was on the pump map with 2 gallons of e85 and 10 93 and it corrected the knock correction I was getting with only 93.

I have a % ethanol test tube. I calculate the % total ethanol based on that, assuming 93 has 10%. I don't assume the tank is empty when I fill it either. I mix exactly E38 to combine it with whatever is left in the tank.

[sonic32]

I have a % ethanol test tube. I calculate the % total ethanol based on that, assuming 93 has 10%. I don't assume the tank is empty when I fill it either. I mix exactly E38 to combine it with whatever is left in the tank.

So if you have more 93 left in the tank it will dilute the e38 but generally not that much to make a significant difference. Ok I got it now. Thank you for clarifying your procedure.

[CELison]

So if you have more 93 left in the tank it will dilute the e38 but generally not that much to make a significant difference. Ok I got it now. Thank you for clarifying your procedure.

I constantly run the mix. So I assume that what is in the tank is E38. So I'm adding E38 to E38 to have more E38.

[S4M3]

381 is good for mustang dyno

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[sonic32]

381 is good for mustang dyno



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I figured it's ok but I would've expected those number on pump map.

I constantly run the mix. So I assume that what is in the tank is E38. So I'm adding E38 to E38 to have more E38.

The e85 station is about 30 miles away from me so I can't run it on every fill up. Sometimes I venture down there and grab some sometimes I run only 93 hence why my mixtures vary at time. I found that 6 miles after the car showed 0 to empty there was still 1.5 gallons left of 93.

[AudBoost]

I have had different results with the mixes but one thing was consistent that I'm not happy with and that's the sputter on cold starts.

What is the weather like where you live? Has it been particularly cold? And it only sputters on cold starts?
E85 can become thick or slushy depending on how cold it is which will lead to cold start issues. At less than E40 I wouldn't think the concentration would be high enough to be an issue, but if its been really cold it could be the cause.

[CELison]

What is the weather like where you live? Has it been particularly cold? And it only sputters on cold starts?
E85 can become thick or slushy depending on how cold it is which will lead to cold start issues. At less than E40 I wouldn't think the concentration would be high enough to be an issue, but if its been really cold it could be the cause.

Won't be an issue with that % E.

[Silverbullet S4]

Mustang dyno's are heartbreakers. Based on the numbers you posted from the tuned M3 on the same dyno, seems about right though. Go to a dynojet if you want to feel better and see big numbers.lol My old C32 AMG was modded to the nuts and put down similar numbers to yours on a mustang. Went to a dynojet and was reading about 70hp/tq higher at the wheels with all else being about the same.

[ntsantos]

I ran GIAC stage 2 with up to e50 without any sputtering or lean codes. I pushed it up to e57 before I threw a code.

I highly recommend the upgraded hpfp. Not that expensive and pretty easy to install. Then you can run whatever you want.

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[sonic32]

I ran GIAC stage 2 with up to e50 without any sputtering or lean codes. I pushed it up to e57 before I threw a code.

I highly recommend the upgraded hpfp. Not that expensive and pretty easy to install. Then you can run whatever you want.

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You have a hpfp and ran up to e57 with the upgraded hpfp?

[sonic32]

Mustang dyno's are heartbreakers. Based on the numbers you posted from the tuned M3 on the same dyno, seems about right though. Go to a dynojet if you want to feel better and see big numbers.lol My old C32 AMG was modded to the nuts and put down similar numbers to yours on a mustang. Went to a dynojet and was reading about 70hp/tq higher at the wheels with all else being about the same.

I didn't intend to boost my ego so I wanted "realistic" numbers. All in all I'm happy with the car and I'll go back to the same dyno with the OD crank pulley to see the gains from that.

[ntsantos]

You have a hpfp and ran up to e57 with the upgraded hpfp?

I ran up to e50 with stock pump. With the upgraded hpfp now I run full e85.

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[sonic32]

I ran up to e50 with stock pump. With the upgraded hpfp now I run full e85.

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B8 or b8.5? Anything over e35 and I get misfires and lean codes on my 2012 b8

[cspcrx]

I mix 3 - 4 gal of E85 the rest 91 oct E10. Not sure what that makes it and have had no issues, but i am stock.

[ntsantos]

B8 or b8.5? Anything over e35 and I get misfires and lean codes on my 2012 b8

C7 actually, but still 3.0T. It seems that everyone gets different results above 4 gallons. I used to only use 3-4 gallons until I read a post of someone using 50/50 mix and running the GIAC race file, so I tried it and it ran fine. I have a feeling the type of fuel you pump may make a difference also. When I run the Propel brand, I've never had issues. I used a random, non-Propel brand pump once, just a yellow handle pump marked e85, and my car didn't like it, ran like crap.

[sonic32]

C7 actually, but still 3.0T. It seems that everyone gets different results above 4 gallons. I used to only use 3-4 gallons until I read a post of someone using 50/50 mix and running the GIAC race file, so I tried it and it ran fine. I have a feeling the type of fuel you pump may make a difference also. When I run the Propel brand, I've never had issues. I used a random, non-Propel brand pump once, just a yellow handle pump marked e85, and my car didn't like it, ran like crap.

Ah it all depends on the percentage of actual ethanol on the e85. I found that it varies from <e70 up to e90. If you get under e70 it would make sense that you can mix more than me because I tested mine and it's right under 90. I pushed it as far as 6 gallons on an empty tank along with 10 of 93 and it was too much e85 but the calculator put me around e38.

[elpaisacq]

Sorry to revive this... but last night i decided to mix 1 gal of E85 with the rest of 93.... my current setup is Stg2 with UltraCharger and no resonated exhaust with Stock cats... this was last night and the car ran fine and strong all night we were out driving with friends..... Today i drove to a client no problem.... coming back already half way throught the tank the car started to get misfires and sputtering and a weird exhaust noise.... i topped of with 89 and put a fuel treamtent on the car and so far it gradually is getting better... but still after 4 k rpm start throwing codes and such... any idea what else should i be looking at.... the car has 20K miles and no weird stuff is coming out of the tailpipe so far... oil and coolant levels are good so far... and no white smoke out of the tail pipe.... have to mantion that last night it did smoke black a lot...

Thank you in advance for any help you can provide

[bhvrdr]

Sorry to revive this... but last night i decided to mix 1 gal of E85 with the rest of 93.... my current setup is Stg2 with UltraCharger and no resonated exhaust with Stock cats... this was last night and the car ran fine and strong all night we were out driving with friends..... Today i drove to a client no problem.... coming back already half way throught the tank the car started to get misfires and sputtering and a weird exhaust noise.... i topped of with 89 and put a fuel treamtent on the car and so far it gradually is getting better... but still after 4 k rpm start throwing codes and such... any idea what else should i be looking at.... the car has 20K miles and no weird stuff is coming out of the tailpipe so far... oil and coolant levels are good so far... and no white smoke out of the tail pipe.... have to mantion that last night it did smoke black a lot...

Thank you in advance for any help you can provide

You may want to run the tank empty a couple of times and try putting some isoHeet in the car in case you got some bad gas. Happened to me once and it took me about three or four tanks of rented empty and putting ISO heat in there and then I put bg44k in and it got better.

Mike

[elpaisacq]

You may want to run the tank empty a couple of times and try putting some isoHeet in the car in case you got some bad gas. Happened to me once and it took me about three or four tanks of rented empty and putting ISO heat in there and then I put bg44k in and it got better.

Mike

Mike thank you for the info st least it gives me hope

[timmyzr1]

anyone here have tested the GIAC E40 tune?? With the hpfp, that should be pretty safe right?