110 race gas/ 93 and E85 mix???

SR20drag · Mar 12, 2009

I will have my HX35 powered Sr20 on the rollers next Friday and would like some tuning advice from some of the wise old DSM guys. I don't have water/alky injection and will be pushing my injectors to there limits with the HX35. Would you tune it for strait 110 race gas on high boost or would you consider a 80/20% 93 and E85 mix. All I've ever ran is strait 93 octane and I'm trying to squeeze everything I can out of my setup. I have some serious racing coming up in the next 3 weeks and I want my car in the 7.20@96-100mph range at the local 1/8th mile track. I ran consistant 7.6's@93 with my old 345whp Gt2871R setup with stock cams and intake on 93 octane. Surely my goal can be achieved with the HX35, tomie cams, and a high flow shorty intake. Please don't flame me for driving a nissan. It could be worse.

You must be logged in to view this image or video.

Burnett03 · Mar 12, 2009

Either go 110 octane or 100% ethanol. Don't mix 93 with e-85.. It's to hard to know how much you are mixing and to hard to get the tune right because you don't know the exact mixture.

Judaspriest22 · Mar 12, 2009

this is just my opinion, but i always just use 93 oct, because you cant fill up with 100+ oct. like you could in the 80's. and my car is strictly a street car so i want it to make on the dyno what it will be making on my way back and forth to work. but thats my opinion,

personally, do what you want in this situation, dont listen to what other people tell you to do unless it could cuase damaged to your car or waste your money.

JEFFREYCASTGSX · Mar 12, 2009

There are easy ways to get high octane gas, and its cheap. DIY Octane Boosters That will explain an easy way to basically make 100 octane gas at home with stuff you can buy at home depot.

the_mork · Mar 12, 2009

If your injectors are already at their limits then you should stay away from ethanol completely. I think mixing gasoline and ethanol is just asking to knock like crazy one minute and not the next with no predictability. If you could run bigger injectors then I would suggest going for straight ethanol but if not then tune it for race gas and call it a day.

Judaspriest22 · Mar 12, 2009

i dont know about you but i wouldnt want to have to do that everytime i fill up with gas, especially as often as i do.
or do you just mean for the dyno?

snowborder714 · Mar 12, 2009

I agree with Ryan. It will be hard to tell exactly what mixture you have. Plus, it will differ as the seasons change since E-85 does not stay the same all year long.

SR20drag · Mar 12, 2009

the_mork said:
If your injectors are already at their limits then you should stay away from ethanol completely. I think mixing gasoline and ethanol is just asking to knock like crazy one minute and not the next with no predictability. If you could run bigger injectors then I would suggest going for straight ethanol but if not then tune it for race gas and call it a day.

That sounds good to me. I don't drive my S13 much on the street and if I do it will mostly be on 110 if I go that route. If anything I can back the boost down and set 2 tunes on my safc for the steet and the track. I have a JWT rom tune with a SAFC-2 piggy backed for fine tuning.

toofast82 · Mar 12, 2009

If you are pushing it with your injectors, E85 will put you way over idc%. For the dyno, in a pinch, i would run the 110 for better #s than pump. In the future, i would consider getting some "big" injectors and running the E85 as it has a lot to offer us turbo guys. Are you near E85 stations?
Nice setup btw, i followed your holset install thread

SR20drag · Mar 13, 2009

Yes E85 is readily available here. I knew when I got the HX35 I would have to go with bigger injectors(96lb or 1200cc)and retune to reach the full potential of my turbo. JWT has a ford lightning MAF and 96lb injector tune that's good for 200 more whp but I will have to go with a second walbro pump to run the E85. Are there any other modifications I need to make to my fuel supply setup for strait E85???

the_mork · Mar 13, 2009

I'm unsure about a Nissan setup but a lot of DSM guys move to entirely new SS braided lines in order to get the flow up. Probably your largest bottleneck just like ours is the fuel filter and its fittings which can really impede flow. New fuel line and fittings aren't exactly cheap but for a built car they aren't exactly a bank-breaker either.

SR20drag · Mar 13, 2009

So you're saying run -6an braided line and a high flow fuel filter with 2 walbro 255's and I will be ready for Strait E85? Sounds good.

Burnett03 · Mar 13, 2009

SR20drag said:
So you're saying run -6an braided line and a high flow fuel filter with 2 walbro 255's and I will be ready for Strait E85? Sounds good.

Even a single walbro 255 would be plenty if you drop the base pressure a bit lower, but remember this makes the injectors a bit smaller.. What size injectors are in there?

Jpierre655 · Mar 13, 2009

im runnin a tank of 93 to 2 gallons of e85 on 26lbs of boost at 19degrees timing with no knock at all. my car loves e85

SR20drag · Mar 14, 2009

Burnett03 said:
Even a single walbro 255 would be plenty if you drop the base pressure a bit lower, but remember this makes the injectors a bit smaller.. What size injectors are in there?

I've got 72lb msd injectors(about 740cc) with a JWT rom tune and a ford cobra MAF with a SAFC-2 piggy backed for fine tuning. They aren't enough for 93 much less E85 at high boost on the HX35. I think I will need to go bigger before I go strait E85. My only question is, Will a single walbro 255 be enough pump for 1000cc+ injectors and E85??

The Top DSM Community on the Web

110 race gas/ 93 and E85 mix???

SR20drag

Burnett03

Judaspriest22

JEFFREYCASTGSX

the_mork

Judaspriest22

snowborder714

SR20drag

toofast82

SR20drag

the_mork

SR20drag

Burnett03

Jpierre655

SR20drag

Similar threads

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds