help with nitrous and th400
help with nitrous and th400 my car has a th400 in and 3600 stall, it has the 90mm plate kit from nos jetted at 150. on the dyno i only gained 80 hp and 43 ft not very happy with that. looking to see what other people are getting with th400 and spray thanks for the help
Rule thumb is that a TH400 will eat around 40hp to the rear wheels,My car on a 150 shot rated at the wheels gained 110 to the tire.Also stalled Auto's Dyno wierd because of the converter and what not
BTLFEDSS
BTLFEDSS
Something's definately not right. I have got a TH400 with a 4k stall ATI converter and a 12 bolt with 4.11's. On motor, my car put down 355rwhp (It had put down 400rwhp with the old T-56). On a 150 shot it put down 511rwhp through the TH400, and I had lots of room to lean it out more but still have stock guts and a stock bottom end, so I don't want to puck my luck. My point is, I put an extra 156 rwhp down on a 150 shot through a TH400, and I could make more on the 150 shot, but choose not to. I have an 85mm plate from Nitro Daves, as well as his stand alone fuel system and some other goodies. I run 110 octane in the stand alone, and 93 in the tank. You need to check your AFR and your timing. Is someone tuning it for you? Or was it just a dyno run?
TECH Fanatic
Joined: Nov 2001
Posts: 1,064
Likes: 0
From: CA
I have a 408ci / TH400 with 4K TCT stall w 3.73s and all the other goodies. Simple dual nozzel system
N/A dyno last year was 479rwhp/534tq
With a 200shot I only gained 130 or so it said
I think I was blowin through the converter on the dyno cause it def feels like a 200shot at the track
Few ideas to toss out...random ideas
1. keep in mind that th400/stall eats up more than you think
2. what tires where you dynoing with (size matters)
3. A/F
4. Enough fuel
5. Compression
6. Full bottle/purged/heated properly
7. what cam are you running, might need to change it up
8. What RPM does it activate/deactivate; spraying though shifts i assume
9. Screw it and put some bigger pills in
10. What motor are ya runnin, tune?
11. Toss some TR8's in there
12. I wish it wasn't snowing
but with a 150 blast and a TH400, those numbers seem about right
Let us know boss
N/A dyno last year was 479rwhp/534tq
With a 200shot I only gained 130 or so it said
I think I was blowin through the converter on the dyno cause it def feels like a 200shot at the track
Few ideas to toss out...random ideas
1. keep in mind that th400/stall eats up more than you think
2. what tires where you dynoing with (size matters)
3. A/F
4. Enough fuel
5. Compression
6. Full bottle/purged/heated properly
7. what cam are you running, might need to change it up
8. What RPM does it activate/deactivate; spraying though shifts i assume
9. Screw it and put some bigger pills in
10. What motor are ya runnin, tune?
11. Toss some TR8's in there
12. I wish it wasn't snowing
but with a 150 blast and a TH400, those numbers seem about right
Let us know boss
Seemspretty bad output to me. I see 200 to the wheels on 250 hits with most stuff Ive done with TH400s.
Can be lots of things, tune, camshaft, exh system, exh port, converter, trans etc etc. A decently working engine that size on 150 hit Id expect around 600 rwhp, maybe a little less
Can be lots of things, tune, camshaft, exh system, exh port, converter, trans etc etc. A decently working engine that size on 150 hit Id expect around 600 rwhp, maybe a little less
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Regular
Joined: Oct 2004
Posts: 411
Likes: 0
You're not getting power out of a kit so you think changing trans and converter will help?
NO. Make it work. The fact that your 150 hit is making 43lb-ft at the tire means there is something big time wrong. You should pull 5-6 degrees, not 2. It would have been a long day of tuning if that was my car. A quicker burning flame wants less lead to make max power. Check your jets and solenoids again. I really hope your trans/converter aren't damaged. Check the fluid level? Is that a Yank SS3600? If so that shouldn't be an issue.
NO. Make it work. The fact that your 150 hit is making 43lb-ft at the tire means there is something big time wrong. You should pull 5-6 degrees, not 2. It would have been a long day of tuning if that was my car. A quicker burning flame wants less lead to make max power. Check your jets and solenoids again. I really hope your trans/converter aren't damaged. Check the fluid level? Is that a Yank SS3600? If so that shouldn't be an issue.
Mike I will be running a tcs 4500 vert with my th400. The vert came with the car, so I'm going to see what it will do. The tranny is a brand new coan rmvb with a brake. I bought it for my camaro and then came across this stang, so it's going in there for a few tears and then I'll switch to a glide. I think the 400 will be better for street cruising though.
Next year I am putting a edelbrock plate kit on it, I got it used off this site cheap. I will be spraying 150 to 200 through it. But I'm running all motor the first year to get everything down pat on the car first.
Next year I am putting a edelbrock plate kit on it, I got it used off this site cheap. I will be spraying 150 to 200 through it. But I'm running all motor the first year to get everything down pat on the car first.
a th 400/stall robs alot of power but there is no way it should only pick up 6x rw on 150 pills. if it is not a nitrous vert and blowing through it that will skew the numbers but who knows, big stalled autos almost always dissapoint on the dyno.
LSA aint a magic number, and your motor has no idea what lsa your cam is. Have seen 250 rwhp on a "225' shot on a 112 lsa camshaft.
the cam may or may not be right, but its not the lsa's "fault"
What are you talking about! overlap itself wont cause lack of gains in power you should see. Have ran 20 more degrees overlap than this in nitrous motors.
LSA aint a magic number, and your motor has no idea what lsa your cam is. Have seen 250 rwhp on a "225' shot on a 112 lsa camshaft.
the cam may or may not be right, but its not the lsa's "fault"
LSA aint a magic number, and your motor has no idea what lsa your cam is. Have seen 250 rwhp on a "225' shot on a 112 lsa camshaft.
the cam may or may not be right, but its not the lsa's "fault"
Everyone has an opinion your running too much overlap for that size shot.
LSA doesnt matter? its a direct correlation to valve overlap! also a 112 on a 230 ish cam is going to have more overlap than a 230 ish on a 114. So basically your saying overlap has nothing to do with it huh?
Everyone has an opinion your running too much overlap for that size shot.
Everyone has an opinion your running too much overlap for that size shot.
The cam I did for the car that won last years pump gas drags has more overlap than that. 9.0s at 3600 lbs on double the nitrous, Take it for what its worth. Last edited by GrannySShifting; Mar 25, 2008 at 05:56 PM.
