LT4 supercharge and N2O
Thread Starter
Teching In
Joined: Feb 2005
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From: Memphis,Tn
LT4 supercharge and N2O Howdy all! I'm sorta new to LS1 tech but i did a search and really didn't find what i was looking for so i'll ask my question here- I've got an all forged LT4 383 stroker setup. AFR 210 LT4 heads with lt4 intake 58MM TB and i'm running a modified Vortech S Trim about 15 psi with a front mount pre cooler like an ATI. My question is i want to run a 150 shot of N2O- i bought a wet zex kit for an lt1 but how would i set this up? What cam recommendations can you make for this? This is going into my 94 Z28. I'm driving my 00 Ram Air for my daily until this is complete. I need some advise because i have a serious vandetta against a certain toyota supra and a couple of cobras... Any advise would be greatly appreciated... 
150 shot is a TON, esp if you are turning that S trim up a bunch. the cylinder pressures will be enormous. i would be very surprised if you can keep the heads on it even on race gas ( a must) for very long. tune will have to be perfect as well.
personally i wouldnt run more than a 75 shot.
personally i wouldnt run more than a 75 shot.
Thread Starter
Teching In
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From: Memphis,Tn
Well with the dish pistons my CR is about 8.5:1. So i was thinking that about 12-15 psi for the street would be fine. Maybye even 10.I was reading Camaro performers and GM HTP magazine and there 3 camaros running between 10-15 psi w/100-150 n2o. Of course one of them is a 9 second "street car" but the other cars seem real life. How big of a shot is recommended then? 75 at the most? I'm open to criticism-i'd rather hear it here than calling a tow truck picking up pistons off the street....
Thread Starter
Teching In
Joined: Feb 2005
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From: Memphis,Tn
Also the head unit is modified for more boost. I forgot to mention. Do i need to retune for N2O or just setup for the charger and tune that up and then put the shot on top like you would a car w/o a charger weith no additional tuning for n2o?
what was "modified" to make an s trim support more boost (or do you mean cfm)?
like i said before, the tune is the key when creating huge cylinder pressure.
its a really bad idea. 15 psi out of an strim on a 383 isnt enough? what are your goals?
like i said before, the tune is the key when creating huge cylinder pressure.
its a really bad idea. 15 psi out of an strim on a 383 isnt enough? what are your goals?
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Thread Starter
Teching In
Joined: Feb 2005
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From: Memphis,Tn
Well the s trim has a new impeller that moves alot more air. I'm not really sure of the specs and i need to call Vortech for that... But My goal is to humilate a certain toyota supra and a copuple of cobras that live in my area. Also to have a real fun street car to boot. I know i won't be the fastest but i won't be the slowest either..... 
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your going to have probably 600-650 hp. That's pretty damn fast. You have almost the same setup as me. Only difference is you have vortech and I have ati intercooled procharger. Same boost and everything. Same engine setup. It is gonna haul *****. I would go 75 shot if anything. Buy an extra set of the same heads, cause your gonna need em.
Thread Starter
Teching In
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From: Memphis,Tn
extra set of heads..? 
Do they not seal well or what problems should i expect with these heads? The supra i'm tackling has about 650hp already so i figure the N2O will put me over the top on him at least on him. The cobras with me driving in reverse i've got them but the supra is talking alot of smack....
Do they not seal well or what problems should i expect with these heads? The supra i'm tackling has about 650hp already so i figure the N2O will put me over the top on him at least on him. The cobras with me driving in reverse i've got them but the supra is talking alot of smack.... 
Originally Posted by blackcars
extra set of heads..? Do they not seal well or what problems should i expect with these heads? The supra i'm tackling has about 650hp already so i figure the N2O will put me over the top on him at least on him. The cobras with me driving in reverse i've got them but the supra is talking alot of smack....
Do they not seal well or what problems should i expect with these heads? The supra i'm tackling has about 650hp already so i figure the N2O will put me over the top on him at least on him. The cobras with me driving in reverse i've got them but the supra is talking alot of smack....
Thread Starter
Teching In
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From: Memphis,Tn
Well let me ask this then- If i drop the N2O what level of boost can i push with 93 octane on the street w/ 8:5.1 or 8.1? I wasn't going to run o rings or anything like that but i was going to use cometic gaskets for the buildup. 
