Nitrous build help
Thread Starter
Staging Lane
Joined: Apr 2019
Posts: 63
Likes: 4
Nitrous build help Looking to put together a nitrous setup for my 2WD S10, and have no experience with nitrous whatsoever. I currently have an LQ4 with CNC'd 243's with 2.08 valves, LS6 intake, FAST 36 injectors, and a Comp Cam 235/245 608/614 112+2, backed by a TH400 reverse manual with a brake, and a 9" with full Caltracs suspension. This will primarily see track duty, and also sports Hoosier DR2's 28x10.5
My questions are this-
1. What are the theories when it comes to gear ratio? Tall to stay in the nitrous pull or short for quicker acceleration
2. What are the theories when it comes to compression ratio and or valve sizing? Am I over-valved at 2.08?
3. Should I ditch the injection and do a Carb'd setup?
4. Converter theories, big stall small dia. or not so much?
Remember that this truck will be for the track and run on race fuel, done caring about streetability. Currently it has 3.70 gears and a FTI 3800 converter, have not used the brake yet. At 5400ft elevation it ran 7.80 in the 1/8th with a slight spin at the line, second pass out it lost 2nd gear and is currently apart getting trans fixed. Would like to re-vamp this thing and get it to run mid-low 6's on the juice. If that means building a different engine entirely so be it, make some suggestions!!
My questions are this-
1. What are the theories when it comes to gear ratio? Tall to stay in the nitrous pull or short for quicker acceleration
2. What are the theories when it comes to compression ratio and or valve sizing? Am I over-valved at 2.08?
3. Should I ditch the injection and do a Carb'd setup?
4. Converter theories, big stall small dia. or not so much?
Remember that this truck will be for the track and run on race fuel, done caring about streetability. Currently it has 3.70 gears and a FTI 3800 converter, have not used the brake yet. At 5400ft elevation it ran 7.80 in the 1/8th with a slight spin at the line, second pass out it lost 2nd gear and is currently apart getting trans fixed. Would like to re-vamp this thing and get it to run mid-low 6's on the juice. If that means building a different engine entirely so be it, make some suggestions!!
You shouldn't have a problem running low 6's with a nitrous 6.0 in a s10. What is your race weight? I imagine you have plenty of clearance under the hood? If so I would sell the ls6 intake and get a 4150 style intake (super vic). The nitrous distribution is much better through that style plate. I like the 4.11s that I run with a 28in tire. I trap 115 spraying a 250 pill and they seem perfect. They even do well on me prep style races
Thread Starter
Staging Lane
Joined: Apr 2019
Posts: 63
Likes: 4
I have actually not weighed the truck, it is as it came from the factory plus the additional goodies, it was built originally for a fun little cruiser but when I shattered the 4L80 on the dyno and put the TH400 in instead that changed it up. I have now decided to just race the truck given that I live 45min from the nearest town, making cruising more of a chore and racing more fun.
There is plenty of underhood clearance currently, but the truck is going to get heavier with the addition of a cage over the winter. Low 6's may seem easy for guys at sea level, but I'm telling you at 5400' in Montana that is asking a lot. VERY few cars locally are capable of it. There is a handful of guys that are high-mid 6's, but only full on tubbed cars under that. My only full pass was 91mph in the 1/8. Made 485ftlbs and 424hp at the wheels on a notoriously low reading dyno through a loose convertor, I was not shooting for numbers, just wanted a good tune in it.
Are you suggesting going to a carb then?
I am the ONLY guy at the track here with an LS....... (most days)
There is plenty of underhood clearance currently, but the truck is going to get heavier with the addition of a cage over the winter. Low 6's may seem easy for guys at sea level, but I'm telling you at 5400' in Montana that is asking a lot. VERY few cars locally are capable of it. There is a handful of guys that are high-mid 6's, but only full on tubbed cars under that. My only full pass was 91mph in the 1/8. Made 485ftlbs and 424hp at the wheels on a notoriously low reading dyno through a loose convertor, I was not shooting for numbers, just wanted a good tune in it.
Are you suggesting going to a carb then?
I am the ONLY guy at the track here with an LS....... (most days)
I forgot you are at that high of elevation. I have a 4150 super vic and accufab throttle body I am installing on mine. I would be lost with a carb, but some people love them. Was your FTI converter speced for this set up? I think you will be surprised how far the stock 6.0 will take you with the right combination.
I would swap to a gen 4 rod and some decent pistons. Maybe sell the 243's for some ls3 heads. Super vic/4150 plate set up and a standalone for the nitrous fuel. I wouldn't be scared to spray that set up with some 400hp pills with the right tune up. Might have to get the converter tightened up...
Thread Starter
Staging Lane
Joined: Apr 2019
Posts: 63
Likes: 4
I called FTI directly for the converter, but more than likely will change that up also as at that point I had not intended to use a brake. Why the head change? Do you think they will make enough of a difference over a Stage 3 CNC'd 243 with 2.08 valves to justify?
I had not even thought about doing something like a Super Victor with a throttle body, which is funny because I have a brand new 250 shot plate system, and a 5 gallon fuel cell for a stand alone system that I was trying to figure out how to use. Would my injectors plug into that intake and what fuel rail would I need? The Rods and pistons make sense and would be happening at some point for sure.
I had not even thought about doing something like a Super Victor with a throttle body, which is funny because I have a brand new 250 shot plate system, and a 5 gallon fuel cell for a stand alone system that I was trying to figure out how to use. Would my injectors plug into that intake and what fuel rail would I need? The Rods and pistons make sense and would be happening at some point for sure.
