Is Boost Better or Timing Better?

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  1. #1
    Senior Member Array GodStang's Avatar
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    Default Is Boost Better or Timing Better?

    Ok on 93 octane I am ~18.5psi and either 16 or 17 degrees timing if I remember correctly. Switching to E85 will I be better adding timing, adding boost or a mix of the two? What would be the optimum combo on E85 and a 2.8LH Kenne Bell?

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    05 BOSS 302 Array 05yellowGT's Avatar
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    There shouldn't be anything stopping you from from upping the boost AND increasing timing with E85. Just make sure you are working with full summer blend E85 to get all the benefits from it.

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    Senior Member Array GodStang's Avatar
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    Ok. Any ideas how far I can go. This is southeren SC so we have the best stuff most of the year.

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    05 BOSS 302 Array 05yellowGT's Avatar
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    I'd just ease up on the tune and see what the car likes. My combo is a bit different being a 3v and a Procharger, but my car made great power with 23 degrees of timing and 27psi of boost as an example.

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    Senior Member Array gnxs's Avatar
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    Quote Originally Posted by GodStang View Post
    Ok on 93 octane I am ~18.5psi and either 16 or 17 degrees timing if I remember correctly. Switching to E85 will I be better adding timing, adding boost or a mix of the two? What would be the optimum combo on E85 and a 2.8LH Kenne Bell?
    I would imagine the 2.8 KB is going to want to see alot more than 18.5 psi before it really hits its sweet spot, so you'll definitely need to crank up the boost. Then you can experiment with what kind of timing the car likes.

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    Senior Member Array GodStang's Avatar
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    Quote Originally Posted by gnxs View Post
    I would imagine the 2.8 KB is going to want to see alot more than 18.5 psi before it really hits its sweet spot, so you'll definitely need to crank up the boost. Then you can experiment with what kind of timing the car likes.
    The problem is I am pulleyed for 25psi but cams, stroking, and other things only see 18.5 or so.

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    05 BOSS 302 Array 05yellowGT's Avatar
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    Sounds like you need a 3.6LC then!

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    Senior Member Array GodStang's Avatar
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    Dont think they make it for the Cobra...

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    Senior Member Array gnxs's Avatar
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    Quote Originally Posted by GodStang View Post
    The problem is I am pulleyed for 25psi but cams, stroking, and other things only see 18.5 or so.
    What kind of pulley combo are you running? I have cams (fairly tame though), headers, and Stage 2 ported heads and I'm hoping a 4 lb. lower, 3.65 upper gives me 22-23 psi with E85.

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    Senior Member Array GodStang's Avatar
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    3.75/6lb = 18.5 and at the very end will hit a little over 19.

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    Senior Member Array gnxs's Avatar
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    Quote Originally Posted by GodStang View Post
    3.75/6lb = 18.5 and at the very end will hit a little over 19.
    Perhaps the stroker motor is the real culprit. The 3.75 upper is pretty large, what about going to a smaller upper?

    I have a 6 lb lower I could use to replace the 4lb I have on there and a 3.40 upper to replace the 3.65, but hopefully neither will be required for me.

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    Senior Member Array GodStang's Avatar
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    Right now I am seeing 15,773 blower rpms at 6500 rpms and the blower is only rated to 16000 rpms. So I may be out of room with this blower and may only be able to add timing. I would like the E85 swap to be worth it but if I can only run maybe 20psi max that may suck.

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    05 BOSS 302 Array 05yellowGT's Avatar
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    The increased timing you are able to run vs. pump gas will be golden. Combine that with the evaporative cooling properties of E85 and you can also reduce the amount of timing pulled based on intake temp as well from what I have seen on my car with much increased knock tolerance than for instance, a 105 octane unleaded race fuel.

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    Senior Member Array Towelly's Avatar
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    Quote Originally Posted by 05yellowGT View Post
    The increased timing you are able to run vs. pump gas will be golden. Combine that with the evaporative cooling properties of E85 and you can also reduce the amount of timing pulled based on intake temp as well from what I have seen on my car with much increased knock tolerance than for instance, a 105 octane unleaded race fuel.
    Are you mixing your own E85 or are you getting summer blend from the pump?

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    05 BOSS 302 Array 05yellowGT's Avatar
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    I'm getting it straight from the pump, but I measure the ethanol content of every tank so I know what I'm dealing with.

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