water meth?

[jprentice94]

Okay so I've been looking into a water methanol injection kit and from what I've read on a turbo you can add big amounts of boost but on a high compression engine you cannot turbo it because of the compression so if you used a water meth kit couldn't you add more boost then the 4-5 psi of the high compression motor such as 5-12 psi

 

[Flash]

Water injection does 2 things,
1. It cools the intake charge.
2, It effectively increases the octane.
Both things allow you to run more compression or boost within reason.
A good intercooler helps too.

 

[malohnes]

x2 what Flash said.

I use one without boost, 50/50 mix of water and Methanol and it definitely helps with pinging. My Wideband shows a distinct richening when it is needed. I used a kit that has a controller made for NA engines and runs off the MAF sensor. Nitrous Express uses rebranded Snow Performance units. They work quite well. With boost, turbo or supercharger, it will make a substantial difference in drivability, reliability and performance.

 

[jprentice94]

I have a z with 10.5:1 compression and stock on an na you can only run about 5 psi so i was thinking. With water meth i could do 10 psi and itd be pretty quick with a tune just needs a few more hp

 

[jprentice94]

Do you have any problems with your setup

 

[malohnes]

The only problems I had was tuning the turn starting set-point until I realized I started with a jet way too big despite using the smallest jet that came with the kit. Once I figured that the jet size was the core problem, I purchased the smallest one the sell and then the set-point tune was much easier. I'm sure a CPU tune would be very advantageous, I have not done so. Once a rebuild comes my way, I'll work on boost. I won't mess with boost on a high mileage stock build.

 

[jprentice94]

Thanks for the info

 

[jd4242]

I have a z with 10.5:1 compression and stock on an na you can only run about 5 psi so i was thinking. With water meth i could do 10 psi and itd be pretty quick with a tune just needs a few more hp

Who told you couldn't run more than 5 with 10.5:1? What kind of FI is it and do you have a IC? Have larger injectors, tune?? The compression may not be why you cant go above 5lb and w/m wouldnt help any in that case...I ran 10Lbs on my 10.67:1 motor with just ic and good tune.but I have all supporting mods to allow it to run that.what I'm getting at is just because you add w/m doesn't mean you can throw another 5lbs at it safely. ..

 

[jprentice94]

I'm finishing my ex up and starting it so I'm going to do 3 inch exhaust probably a stand alone get turbos injectors and water meth injection it is naturally aspirated with 10.5:1 and the tt version is 8.5:1 comp I figure instead of running 15 -18 psi I could run 10 with stock turn is being more efficient and it would be pretty quick still I was mainly worried about stock internals

 

[jd4242]

I'm finishing my ex up and starting it so I'm going to do 3 inch exhaust probably a stand alone get turbos injectors and water meth injection it is naturally aspirated with 10.5:1 and the tt version is 8.5:1 comp I figure instead of running 15 -18 psi I could run 10 with stock turn is being more efficient and it would be pretty quick still I was mainly worried about stock internals

Huh I don't understand that at all..I'm not one to correct anyone on grammer but throw some ""periods"" in there or something! !! But I think your saying the ex is 10.5:1 NA?? How are you coming up with that? The max boost is 10Lbs at 10.5:1you will blow gaskets after that, now matter if you have ic or water meth.

 

[jprentice94]

No my ex is sas now so just finishing it. My 300zx z32 is 10.5:1 and that's what I am talking about.

 

[jd4242]

No my ex is sas now so just finishing it. My 300zx z32 is 10.5:1 and that's what I am talking about.

Oooo well every motor is going to be different but to go up 5lbs just from adding w/m may be a lot to ask.personally I would think just 5lbs of boost on anything over 10:1 needs a ic or w/m.going up to 10lbs would need a ic and w/m maybe just to make it stable.o and a good tune.I don't think just w/m on 10lbs and high compression would be enough ,but turbos and that motor I really know nothing about

 

[jprentice94]

What I've read is people running like 26 psi from 16 just adding wm so I figure a few things and a big intercooler and 10 doesn't seem to far of fetch

 

[jd4242]

What I've read is people running like 26 psi from 16 just adding wm so I figure a few things and a big intercooler and 10 doesn't seem to far of fetch

Should be able to do it with just a ic and good tune.just richen it up and back timing off.at what point are they having to add w/m to be able to go up in boost? You would need to see what your boost/compression would equal in a 8.5:1 motor.. 26lbs is just crazy even at 8.5:1 and water meth.I know nothing about those motors tho.

.I do know I'm going from 10lbs@10.6:1 to 16lbs and I had to add forged bottom end and w/m ontop of my ic just to make it stable.but 16lbs at that compression is probalby like 20lbs on a 8.5:1 motor, never done the math and its a ford ohv

But every motor and FI is different. Boost is just a measure of restriction so what one person gets away with may be totally different. His 10lbs may be moving less air into the cylinders than your 5lbs

 

[jprentice94]

Hmm overlooked the air changes I would love to bore it 30 over and do cp pistons and maybe even shorter rods or stroke it but can't find a crankshaft and do some head work but with the na motor I figure 10 psi with wm and let it ride while I get a tt motor and build it

 

[jprentice94]

Btw what does ic mean

 

[jd4242]

Btw what does ic mean

Intercooler

 

[jprentice94]

Lol