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

 

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.

 

416/418. 9.3 cr all forged

Nitrous cools the temps and I have read meth on a roots doesnt do much.

 

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.

 

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.

 

thanks bud
thats what the original plan was just read a few posts saying it doesnt really work

 

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

 

Its pretty much instant but I would reference it a decent bit before you need it.

 

How would you set that up? Could you use the meth without the NOS as well?

 

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?

 

400+ cid and you're hoping for 22psi out of a roots blower? What blower are you going to use?

 

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.

 

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.

 

It is in fact a roots derived twin screw. Does this change the effect of the meth?

 

If you could plumb a direct port meth setup then it would work just like on centri/turbo cars

 

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