Proposal For Comptech S/C'ers
02-14-2002, 12:35 PM
#41
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[QUOTE]Originally posted by Rspec99
[B]Wes (or any other SC users out there with a boost gauge) would you mind helping me out by charting the boost levels at different rpm's?
[B]Wes (or any other SC users out there with a boost gauge) would you mind helping me out by charting the boost levels at different rpm's?
02-14-2002, 04:03 PM
#43
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[QUOTE]Originally posted by marcucci
[B]
Yes. Expect to pay over $1000 for a new blower. I was VERY lucky to find an unused M90 for $280.
[b]
Are you talking to me?! I wouldn't be the person to design it, and I suspect UL would defer that task, too.
[B]
Yes. Expect to pay over $1000 for a new blower. I was VERY lucky to find an unused M90 for $280.
[b]
Are you talking to me?! I wouldn't be the person to design it, and I suspect UL would defer that task, too.
02-14-2002, 04:27 PM
#44
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Do you know what gen your blower is? I know the Gen II blower, which I don't have, has a much mroe efficient inlet and discharge port.
As for intake manifold design, I defer that to others as well. What I know about intake manifolds can be summed up with:
Short runner = high rpm
Long runner = low rpm
Wide runner = rotate the torque curve up on the high end (but don't change location of torque peak)
Short runner = rotate the torque curve up on the low end
Big plenum = more power
I can tell you taht on forced induction manifolds, particularly supercharged units like an Eaton, you have to be very careful to ensure proper flow distribution between runners. A friend of mine ran some CFD simulations (computational fluid dynamics) on my JR manifold and found that the #4 runner flows significantly better than the rest, primarily because the location of the blower discharge port is off-center in the intake manifold plenum. JR tried to compensate by kinking the number 4 runner, but it still runs leaner than the rest (required a creative solution to get around).
As for the S2K intake manifold, we now have a plug of the inside of the stock unit, so we'll take some measurements and run a simulation when we can. Don't know if it will help much for FI though.
BTW, Justin, if you really like methanol, I'd recommend purchasing a standalone injection system. The Aquamist ERL system is spec'd to handle methanol without issue and the price isn't bad. you'll need to inject directly into the manifold, which requires two nozzles to get proper distribution. The system comes with a Hobbs switch which means it won't activate till you're under boost. You will run rich if you don't tune the fuel. A mixture of 75% meth/25% H20 works very well if you can lean out the gas injectors (I use a standalone ECU on my SC'd app).
Meth gets a little expensive though when you go through a quart every couple hundred miles. I've been thinking about running it only on track with a race program.
UL
[QUOTE]Originally posted by marcucci
[B]
Yes. Expect to pay over $1000 for a new blower. I was VERY lucky to find an unused M90 for $280.
Are you talking to me?! I wouldn't be the person to design it, and I suspect UL would defer that task, too.
As for intake manifold design, I defer that to others as well. What I know about intake manifolds can be summed up with:
Short runner = high rpm
Long runner = low rpm
Wide runner = rotate the torque curve up on the high end (but don't change location of torque peak)
Short runner = rotate the torque curve up on the low end
Big plenum = more power
I can tell you taht on forced induction manifolds, particularly supercharged units like an Eaton, you have to be very careful to ensure proper flow distribution between runners. A friend of mine ran some CFD simulations (computational fluid dynamics) on my JR manifold and found that the #4 runner flows significantly better than the rest, primarily because the location of the blower discharge port is off-center in the intake manifold plenum. JR tried to compensate by kinking the number 4 runner, but it still runs leaner than the rest (required a creative solution to get around).
As for the S2K intake manifold, we now have a plug of the inside of the stock unit, so we'll take some measurements and run a simulation when we can. Don't know if it will help much for FI though.
BTW, Justin, if you really like methanol, I'd recommend purchasing a standalone injection system. The Aquamist ERL system is spec'd to handle methanol without issue and the price isn't bad. you'll need to inject directly into the manifold, which requires two nozzles to get proper distribution. The system comes with a Hobbs switch which means it won't activate till you're under boost. You will run rich if you don't tune the fuel. A mixture of 75% meth/25% H20 works very well if you can lean out the gas injectors (I use a standalone ECU on my SC'd app).
Meth gets a little expensive though when you go through a quart every couple hundred miles. I've been thinking about running it only on track with a race program.
UL
[QUOTE]Originally posted by marcucci
[B]
Yes. Expect to pay over $1000 for a new blower. I was VERY lucky to find an unused M90 for $280.
Are you talking to me?! I wouldn't be the person to design it, and I suspect UL would defer that task, too.
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