Forced Induction Superchargers | Turbochargers | Intercoolers

Meth vs nitrous on a roots

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Old Jul 7, 2010 | 10:56 AM
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Default Meth vs nitrous on a roots

What are the pros and cons of each?

Since it is on a roots boost will be pretty set by the pulley I am thinking pull a few degrees and spray vs having to run meth all the time
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Old Jul 7, 2010 | 12:09 PM
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I would run meth with a roots to keeps iat's down...is it a built motor? I know FI and boost like a little more ring gap.
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Old Jul 7, 2010 | 12:17 PM
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416/418. 9.3 cr all forged

Nitrous cools the temps and I have read meth on a roots doesnt do much.
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Old Jul 8, 2010 | 10:45 AM
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I had meth on a roots/cam cts-v. It got totaled and I bought another ctsv with a roots without cam/meth. The difference in the upper rpms is substantial. You won't be spraying meth all the time, just when boost gets up high, which is when temps rise. I guess I'm saying it worked very well for me. I'm planning to put the meth kit and cam from the totaled car onto the new one.

I wouldn't add nitrous because you're going to have to add fuel somehow, and get that setup reliable and predictable. Methanol is like upping the octane of your fuel and it cools down the air.
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Old Jul 8, 2010 | 10:48 AM
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Did you spray the meth before the tb?
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Old Jul 8, 2010 | 10:53 AM
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Originally Posted by 3.8redbird
Did you spray the meth before the tb?
Yes, it was spraying into the elbow about 6 inches in front of the tb.

Both meth and n20 will cool the charge, but meth allows you to run more timing due to the higher octane where nitrous will cause you to need to pull more timing and add more fuel.
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Old Jul 8, 2010 | 11:01 AM
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thanks bud
thats what the original plan was just read a few posts saying it doesnt really work
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Old Jul 8, 2010 | 07:35 PM
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Run meth and use it as the fuel for your nitrous system. A 50 shot will react like a 100 shot with the blower, and the meth will still do its trick.

Jim
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Old Jul 9, 2010 | 12:14 AM
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Originally Posted by DeltaT
Run meth and use it as the fuel for your nitrous system. A 50 shot will react like a 100 shot with the blower, and the meth will still do its trick.

Jim
Hmmm options are endless lol.

how fast is meth used? It will be boost refenced but at driving 50+ miles on one tank of meth might get hairy. Dont want to run out of meth halfway home and go boooom
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Old Jul 9, 2010 | 12:45 AM
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Its pretty much instant but I would reference it a decent bit before you need it.
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Old Jul 9, 2010 | 04:25 AM
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Originally Posted by DeltaT
Run meth and use it as the fuel for your nitrous system. A 50 shot will react like a 100 shot with the blower, and the meth will still do its trick.

Jim
How would you set that up? Could you use the meth without the NOS as well?
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Old Jul 9, 2010 | 06:09 AM
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Originally Posted by 3.8redbird
Hmmm options are endless lol.

how fast is meth used? It will be boost refenced but at driving 50+ miles on one tank of meth might get hairy. Dont want to run out of meth halfway home and go boooom
you only have to use the meth when youre racing or going wot.......regular driving you dont use it.

I like the nitrous/meth idea.......seems like a winner.
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Old Jul 9, 2010 | 07:36 PM
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Originally Posted by stevegrizzle
you only have to use the meth when youre racing or going wot.......regular driving you dont use it.

I like the nitrous/meth idea.......seems like a winner.
The supercharger im going with will have a very small pulley on it. Im thinking 22psi. I should have all of that by 3000rpm. Thats not very high. I would have to be very light on the throttle.

So boost reference the meth pump to 300rpm before full boost. 3.93 or 3.73 rear gear with an atuo is gonna be slow sailin on the freeway.

100% meth on 93 octane will give me about 108oct right?
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Old Jul 9, 2010 | 09:13 PM
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400+ cid and you're hoping for 22psi out of a roots blower? What blower are you going to use?
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Old Jul 9, 2010 | 11:01 PM
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Kenny Bell 3.6LC
or bigger.

Yes 6 bolt heads and 9.0-9.3 cr
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Old Jul 10, 2010 | 07:43 AM
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Originally Posted by 3.8redbird
Kenny Bell 3.6LC
or bigger.

Yes 6 bolt heads and 9.0-9.3 cr
K Bell and Whipple are twinscrew blowers. Roots type blower include Maggies, E'brock, and the blowers used on ZR1 vettes and CTS-V caddies. Twinscrews and Roots superchargers, while both sitting on top of the motor, are totally different breeds of cats.
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Old Jul 10, 2010 | 07:51 AM
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using nitrous and meth at the same time is not going to improve much. I would use meth on a supercharger. if it was a big turbo and required some spooling time then I would consider nos.
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Old Jul 10, 2010 | 10:54 AM
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Originally Posted by old motorhead
K Bell and Whipple are twinscrew blowers. Roots type blower include Maggies, E'brock, and the blowers used on ZR1 vettes and CTS-V caddies. Twinscrews and Roots superchargers, while both sitting on top of the motor, are totally different breeds of cats.
It is in fact a roots derived twin screw. Does this change the effect of the meth?
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Old Jul 10, 2010 | 12:25 PM
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If you could plumb a direct port meth setup then it would work just like on centri/turbo cars
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Old Jul 13, 2010 | 02:42 PM
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Originally Posted by 3.8redbird
It is in fact a roots derived twin screw. Does this change the effect of the meth?
The Lysholm twinscrew is not derived from the Roots. They are a totally different animal. The twinscrews are air movers that actually have some internal compression while the Roots are simply air movers. That's what makes the twinscrews more efficient (a simplified description). You made a good choice.

Jim
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