Givin my current configuration, would I see greater gains in hp/tq with a water meth upgrade OR buying a nice set of Nismo headers? Any advice would be great. Thanks in advance.

My mods:

Vortech Supercharger 10-12 psi
GTM Stage 1 longblock (rated up to 600 hp)
GTM Stage 1 cam
GTM Stage 1 heads
550cc injectors
Walbro fuel pump
Motordyne plenum spacer
Stillen dual exhaust/ high flow cats
Stock exhaust manifold
GTM spec ECU flash

 

Meth!!!!!!!!!!!!!!

 

meth + smaller pulley and retune. IMHO.

 

Smaller you mean less psi? Why? Wouldn't the meth allow for more "safe" boost?

 

Smaller pulley = More boost.

 

Correct. I'm runnin the 2.87 pully right now. Which I thought was the smallest. I'm trying to get more hp not necessarily more boost, which I believe i'm maxed out on anyway, less I want to upgrade to T-trim or Si.

 

meth injection is great. however, dont just expect to make more HP once you bolt it on. you need to tune for it. how much power did you make with your current set up?

 

I assume retuning his GTM spec flash, for use with meth will be an issue..

 

He will get the most benefit by retuning one of the five maps as one optimized for methanol.

 

Meth is over rated and risky, stick to normal 93 octane and racegas.

 

What happened man? You used to love meth? I think 50/50 is fairly safe.

 

This is my second Z and I bought the car already modded. I was so happy with the Z platform that I wanted one that was FI. So forced induction is new to me. I never personally saw the dyno sheet so I don't want to make any claims but the previous owner aledged 420rwhp.

Which leads me to my next question. I just walked in the door, got back from the 76 station and added a 50/50 mix of 100oct/91oct. I have low compression pistons. question is: am I making more hp due to the 50/50 mix without changing anything else? Or am I simply lowering the detonation threshhold?

 

How exactly is water/meth risky? To my understanding it is just the opposite. Lower internal temps/ lowering detonatiion threshold doesn't sound risky to me.

 

I would b!tchslap any Greddy car on these forums them on racegas me on pump and meth.

Meth!

 

As long as you don't ingest it, it doesn't catch on fire, and it doesn't explode, 100% meth is pretty safe. LOL. If I really were going to use 100% meth, I'd use real fuel lines, -an fittings, and port injection. Since I use plastic hose and quick disconnect fittings, I'll stick to 50/50, which is at the border of what is considered flammable (imagine a leak onto an exhaust manifold).

 

Pumps can give out, lines can have leaks, run out of methanol, spraying error, its just alot can go wrong and if it isn't spraying during wot your screwed cause you will lean out and somthing bad could happen.

Chit if you want my methanol kit Ill give you a great deal on it, I never had any problems. Sharif just was more comfortable with pump gas.

 

^^ Definitely want to run a failsafe (or two) with methanol. I have my Haltech rigged to output a signal if boost > 8 psi and the AFR is above 12, which then cuts the boost solenoid and drops to spring pressure (and out of the METH map region). The aquamist setup I have also triggers a failsafe and cuts boost when the flow sensor detects too little or too much flow.

Respect the meth! Ever seen vids of a methanol fire? It's freaky - invisible flame - people on fire but you can't see it. Check this out:

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Just a word of caution, and the reason you won't ever see a w/m injection company recommend anything more than 50/50...

 

I gained 20whp with Meth. Most of it was a result of advancing the timing. I'd like to think I would still be ok if my meth failed but DZ350Z10 brings up some good points. I think on a turbo'ed car you have more risk as boost is often raised while people run their meth maps. Us supercharged guys just have our timing raised. I do check my meth pump & system by doing a boost pressure test and making sure my pump activates and sprays. I do this about twice a year. Always keep an eye on that AFR gauge too!

 

^ my point exactly, your compensating for fuel enrichment with methanol. You could of had that same gain with a higher octane fuel. Fuel delivery systems are more reiliable than methanol systems.

 

This is a reasonable argument...

I agree with this argument...

what are the comparitive gains between meth on a supercharged setup and a set of nice headers? If he's only getting 20whp with meth, and would get 10 out of a set of headers, is the added risk/effort worth it? Especially if he could run race gas and have a map for it?