[707F6F]

I've searched with no clear answer. I'm Thinking about running a 91 pump gas tune and E85 tune with a pulley swap. Has anyone done this? Essentially I would have 2 tunes and 2 different pulley sizes. Thinking 2.85 griptec for 91 and 2.72 or 2.75 for E85. I plan to track it occasionally and would like the higher power for those days. Let me know your thoughts.

 

[6.4mopar]

Yes many have done it.... Thats exactly how it should be done. On 93/91 No smaller than 2.85 With E on 2.4L Hellcat blower you can go as low as 2.65 keeping the Blower RPM within reason... All this with stock lower balancer.... Don't forget to Pin the crank

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[707F6F]

Yes many have done it.... Thats exactly how it should be done. On 93/91 No smaller than 2.85 With E on 2.4L Hellcat blower you can go as low as 2.65 keeping the Blower RPM within reason... All this with stock lower balancer.... Don't forget to Pin the crank

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Do I need to switch belts when switching between the two pulleys?

 

[6.4mopar]

If switching between 2.75/2.85 you can probably get away on the same belt but if you go any smaller either you would have to add a extra belt tensioner(For Non Clutched Pullies only) or change belt size

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[fumanchu182]

Yes many have done it.... Thats exactly how it should be done. On 93/91 No smaller than 2.85 With E on 2.4L Hellcat blower you can go as low as 2.65 keeping the Blower RPM within reason... All this with stock lower balancer.... Don't forget to Pin the crank

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I run a 2.72 hellraiser with 93. However I have two tunes. One limited in timing and one for racing with 104.

 

[socortes]

Try to get a switch under the hood where you can drain the fuel directly from the rail. I had that setup and it really helped switching back and forth

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[Hossfly]

We are just finishing my build. I’m running a 275 upper and 10 over lower on E85R fuel.
we went metco to ease the tune change to gas if E85R gets hard to find.
it would have to be a must as I love that dat moonshine power

 

[ScLeCo]

I'm running a 2.5 upper on e85, no problem.

 

[Hpmaniac]

Call curt Dusterhoff. He's really got the e85 flex tune dialed in on them. My redeye only had the 3.17 upper on a flex tune and it ran awesome. Actually ran better on the e85 tune than the factory gas tune. These cars just love e85, engine feels crisp and responsive.

 

[Hossfly]

Yeah
curt is who is doing my tuning now.
ive spent a small inheritance on the old girl so I elected to get the weak part of these motors behind me. Parts are in the machine shop now with head work, boring 10 over with some head work. I went with Ross custom built pistons with huge ring lands and a set of Awesome Manley rods.
I can throw the kitchen sink at it now. I’m looking at the latest generation of whipped now.
ive spent the piggy bank right now but the whipped and fuel system is next.
shes gonna be strong for sure. I will never go back to gas unless im unable to get the E85R race fuel that’s available here in Vegas For 4.00 per gallon. I was running a 285 upper Dusteroff tuned and the car was fast but I wanted more. Knowing the inherent weakness in these motors with the pistons and rods I felt the need to eliminate that and not be limited on blower and boost issues that could arise.
we should have it back on the street December 10 th or close to it.

 

[707F6F]

Yeah
curt is who is doing my tuning now.
ive spent a small inheritance on the old girl so I elected to get the weak part of these motors behind me. Parts are in the machine shop now with head work, boring 10 over with some head work. I went with Ross custom built pistons with huge ring lands and a set of Awesome Manley rods.
I can throw the kitchen sink at it now. I’m looking at the latest generation of whipped now.
ive spent the piggy bank right now but the whipped and fuel system is next.
shes gonna be strong for sure. I will never go back to gas unless im unable to get the E85R race fuel that’s available here in Vegas For 4.00 per gallon. I was running a 285 upper Dusteroff tuned and the car was fast but I wanted more. Knowing the inherent weakness in these motors with the pistons and rods I felt the need to eliminate that and not be limited on blower and boost issues that could arise.
we should have it back on the street December 10 th or close to it.

So I finally found a shop that will rent their dyno. This would allow me to have remote tuning done. If it would be remote it would be dusterhauff only. I've never done remote tuning so it makes me nervous. How many hours do you think it would take him?

 

[Hossfly]

I’m doing the remote with dusteroff and I’m impressed
works like a dream.
he looks at the data and makes the changes as needed as he goes
usually about 3 rounds

 

[Hossfly]

Be sure and have him doe your tranny If it’s an a8

 

[707F6F]

I’m doing the remote with dusteroff and I’m impressed
works like a dream.
he looks at the data and makes the changes as needed as he goes
usually about 3 rounds

3 rounds as in pulls? Did you go flex or ??

 

[Hossfly]

Actual on road pulls and he takes the data after each run and adjusts from that.
im straight e 85r
i don’t think if I understand my engine builder that with the 275 upper and 10 over lower I have the option of gas.
not sure about flex tune on my setup but I would say it’s not an option.
he remote tuned my setup with just a 285 upper and standard bottom and it was great.
car was flying

 

[parttimer]

I run a 2.8 on flex tuning now, I have a 2.65 for straight E85 and use the same belt.

 

[707F6F]

I run a 2.8 on flex tuning now, I have a 2.65 for straight E85 and use the same belt.

Did you need an additional Idler pulley?

 

[parttimer]

Nope, everything else is normal.

 

[Hossfly]

that sounds about right. When you and the 10% lower things go to happening

 

[coanan]

Looking at a future build on my Trackhawk
So. running a 2.85 upper, ATI 10% lower, ID1050X inj., MMX 95mm TB, and 3" cat-back is a very big no on 93??
1 7/8 Kooks long tubes, maybe.

Long tube headers and a 3" cat back on my car, boost dropped a good 2-3 lbs.