automatics w/ nitrous?
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
If the trans is healthy, you should be fine. The 85 model year has a smaller forward sprag and lo-roller clutch than the 87 and up units. This makes them a bit weaker. Also, the 3-4 pack is set up much looser on the earlier 700r4's. If you hurt the trans, be sure to address these things during the next refresh. Also, upgrade the reaction shell and pump while you are in there.
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
Thanks for the good word Steve
I finally built one for myself. Just about identical to yours but with a different 3-4 clutch pack. I never used the one that I installed in my trans. I guess I will be the test mule for it.
Got a nice 9.5 inch converter as well. As soon as the snow melts(May
) I hope to put it in.
I finally built one for myself. Just about identical to yours but with a different 3-4 clutch pack. I never used the one that I installed in my trans. I guess I will be the test mule for it.
Got a nice 9.5 inch converter as well. As soon as the snow melts(May
) I hope to put it in.
Advanced
Joined: Feb 2007
Posts: 62
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From: jackson ms
automatics are all that we run in drag racing and we shoot the house down with automatics. you will never back fire the kit unless it does not make the shift before the rev limiter kicks in and saying that you have no other problems.
Jon
Jon
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Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
Melting Slicks
Joined: Oct 2003
Posts: 2,951
Likes: 3
From: Mount Vernon OH
Nitrous with an Automatic
Automatic with nitrous. There are a few answers to your question and I will give you a couple of thoughts.
1. I ran a 1985 with a stock trans and spray and launched the car on nitrous and never had an issue and I got VERY greedy with the nitrous.
However, the car was essentially stock except for some minor bolt ons.
2. If your trans is weak or if you have modded your car already beyond the nitrous you may quickly find that your trans is not up to the task when you spray it.
Best of luck!
Sam
1. I ran a 1985 with a stock trans and spray and launched the car on nitrous and never had an issue and I got VERY greedy with the nitrous.
However, the car was essentially stock except for some minor bolt ons.
2. If your trans is weak or if you have modded your car already beyond the nitrous you may quickly find that your trans is not up to the task when you spray it.
Best of luck!
Sam
Instructor
Joined: Feb 2007
Posts: 197
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From: Carriere Mississippi
Just make sure you dont hit the rev. limiter, if you do, you will lean out and fry something. Cause, thats what the rev. limiter does is cut the fuel, and then its a good chance youll hear a boom
I think nos with autos is pretty cool, they are consistant as hell
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
I've been spraying a 125 shot for several years with my stock 700r4. My chip is supposed to stiffen the shifts and it hits pretty hard. I've had no problems but I do alot of routine maintenance.
I would think the simple risk of human error (read mis-shifts and reaction tenths lost in shift gaps) would actually make automatics safer with N2O than manuals. JMO
One more thing, but the l98 has a very high rev limiter. I think it's like 9 grand or something, so you wont be hitting it, but my memory may be off so yall correct me if Im wrong. I've taken a long break from my Vette learning to stunt my crotch rocket.
I would think the simple risk of human error (read mis-shifts and reaction tenths lost in shift gaps) would actually make automatics safer with N2O than manuals. JMO
One more thing, but the l98 has a very high rev limiter. I think it's like 9 grand or something, so you wont be hitting it, but my memory may be off so yall correct me if Im wrong. I've taken a long break from my Vette learning to stunt my crotch rocket.
Last edited by skateparkdave; Jun 19, 2007 at 03:43 AM.
Drifting
Joined: Jun 2001
Posts: 1,997
Likes: 1
From: Lake Ozark MO
I hate the automatic for curvy driving. It sucks *****.
But for drag racing and nitrous it's the cats ***. The auto willl act as a clutch and help save the components downstream (drive shaft, u-joints, etc.). The tires are the cap on the bottle. Make sure they allow enough slip to save everything in front.
As for the engine itself... in the interest of longevity you need to run the ratio pretty fat... 12:1 will be safe. You may not win a prize but you will drive back home.
But for drag racing and nitrous it's the cats ***. The auto willl act as a clutch and help save the components downstream (drive shaft, u-joints, etc.). The tires are the cap on the bottle. Make sure they allow enough slip to save everything in front.
As for the engine itself... in the interest of longevity you need to run the ratio pretty fat... 12:1 will be safe. You may not win a prize but you will drive back home.
Thread Starter
Instructor
Joined: Jan 2007
Posts: 131
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From: Silver Spring MD
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
12-1 ratio is Air to Fuel ratio.
All the off the shelf systems will be this or richer (11-1)...unless you have modified your engine then the ratio could be off. In that case, a wide band o2 sensor is the answer found at a dyno.
You will have no problems with your plans.
All the off the shelf systems will be this or richer (11-1)...unless you have modified your engine then the ratio could be off. In that case, a wide band o2 sensor is the answer found at a dyno.
You will have no problems with your plans.
Thread Starter
Instructor
Joined: Jan 2007
Posts: 131
Likes: 0
From: Silver Spring MD
I just got my trans rebuilt at ATI in baltimore, overseen by the owner (distant familly friend). he moved back the shift points...
no real engine mods, just full exhaust (w/stock headers)
so in summary, error free, I launch, wait till ~3k rpm hit it and hold it untill im done?
say i buy the nos kit for tpi, it will be ~12:1 AF ratio?
since my trans hits harder (rebuilt = upgrade) will my rear end go (dana 36)? or is it pretty safe back there?
I read about pcv breathers, are they breathing exhaust? or is it "clean" enough to breath under the hood without getting stuff dirty, or does it really matter? are they safe/clean to use in a dd?
no real engine mods, just full exhaust (w/stock headers)
so in summary, error free, I launch, wait till ~3k rpm hit it and hold it untill im done?
say i buy the nos kit for tpi, it will be ~12:1 AF ratio?
since my trans hits harder (rebuilt = upgrade) will my rear end go (dana 36)? or is it pretty safe back there?
I read about pcv breathers, are they breathing exhaust? or is it "clean" enough to breath under the hood without getting stuff dirty, or does it really matter? are they safe/clean to use in a dd?
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
Nitrous: That is correct...no need to let off with an automatic once underway...the beauty of the trans!
D36's are durable enough for what you are doing by far...it is the tremendous shock from high stall converter/sticky tires or a stickshift that breaks things.
Breathers...why would you change them? No performance to be gained...and you loose emission compliance besides messing up the outside of your engine (more than likely). My LT4 runs stock breather setup and turns 7000 rpm and 455 HP.
D36's are durable enough for what you are doing by far...it is the tremendous shock from high stall converter/sticky tires or a stickshift that breaks things.
Breathers...why would you change them? No performance to be gained...and you loose emission compliance besides messing up the outside of your engine (more than likely). My LT4 runs stock breather setup and turns 7000 rpm and 455 HP.