1000hp and auto tranny.

[92awdgsx]

How would a W4A33 hold up to the HP Shep and Glazer are putting down? What are the weak links when you get to that HP? What kind of stuff would you start breaking? What kind of stuff does Russ break? Just wondering how much HP they are capable of. Is it a matter of clutches slipping or breaking hard parts?

 

[napkinthief]

well at 1000 hp and WOT the fluid gets hot so quick it just seizes the whole tranny

otherwise, the tranny would never catch a gear in D because of the extreme engine power

 

[TURFNNSURF]

92awdgsx,

Have you been to the ATDSM website? http://www.ecanfix.com/~atdsm/index.htm
There is a bunch of info that will help you research the power handling of the AT in a DSM.

Also, Russ has a website for his racing team VRC with dyno's of his AT putting down 567 AWHP that is about 750HP at the crank assuming a 23% drivetrain loss. That's not to shabby for an AT. http://www.vrcracing.com/performance.htm

As for parts breaking, YES, it's going to happen. When you make that much power, you break stuff. It's the price paid for going fast. For more down to earth DSM'ers with basic mods and upgrades on cars making about 300 to 375 crank HP the stock AT can do a pretty reasonable job, with only minor upgrades as a shift kit and end clutches.

For example. My AT is daily driven at 21psi making around 350+ crank HP. The trans has 131K miles on it and had a shift kit and end clutches installed 30K miles ago and it still shifts perfectly. When it was pulled 10K miles ago to put in the IPT high stall TQ converter, I asked to have it inspected for wear, NO abnormal wear was noted at the time. IMHO, AT's in general were built with more abuse in mind from the factory, to deal with a wide array of driving styles and conditions encountered during its service life. This gives me a sense of security driving my car every day.

 

[JohnTSI]

We are running 9.79@141 on a stock 1G trans in the automatic car here. Has a translab shift kit and hughes 4200 stall, it is switched with switches and has no TCU.

 

[92awdgsx]

well at 1000 hp and WOT the fluid gets hot so quick it just seizes the whole tranny

otherwise, the tranny would never catch a gear in D because of the extreme engine power

Do you have any idea what you are talking about? WTF It is not physically possible to do that. You do know that there are GM trannys running over 1200hp. They have tranny fluid in them too. Auto trannys have been being raced for many years now, and the problem you are talking about has never been an issue. I've been building GM race trannys for 10 years now, and have never seen or heard of that happening before. I don't like to be rude, but you are an IDIOT.

 

[92awdgsx]

92awdgsx,

Have you been to the ATDSM website? http://www.ecanfix.com/~atdsm/index.htm
There is a bunch of info that will help you research the power handling of the AT in a DSM.

Also, Russ has a website for his racing team VRC with dyno's of his AT putting down 567 AWHP that is about 750HP at the crank assuming a 23% drivetrain loss. That's not to shabby for an AT. http://www.vrcracing.com/performance.htm

As for parts breaking, YES, it's going to happen. When you make that much power, you break stuff. It's the price paid for going fast. For more down to earth DSM'ers with basic mods and upgrades on cars making about 300 to 375 crank HP the stock AT can do a pretty reasonable job, with only minor upgrades as a shift kit and end clutches.

For example. My AT is daily driven at 21psi making around 350+ crank HP. The trans has 131K miles on it and had a shift kit and end clutches installed 30K miles ago and it still shifts perfectly. When it was pulled 10K miles ago to put in the IPT high stall TQ converter, I asked to have it inspected for wear, NO abnormal wear was noted at the time. IMHO, AT's in general were built with more abuse in mind from the factory, to deal with a wide array of driving styles and conditions encountered during its service life. This gives me a sense of security driving my car every day.

All the stuff that you posted I already know, but thanks for trying to help. I was mainly just asking to see what people making close to that HP have broke so far so i know what to make stronger before i put the tranny together. I'm building one right now that needs to hold up to that power. I'm having a special input shaft made and a special converter made so far. I'm also having a special flex plate made. I think I'm going to have to have a rear clutch housing made too, because i think its just going to split. We'll find out. Oh, and i posted on john's forum (IPT) but he won't answer my post.

 

[92awdgsx]

We are running 9.79@141 on a stock 1G trans in the automatic car here. Has a translab shift kit and hughes 4200 stall, it is switched with switches and has no TCU.

I know that its possible to do what you are doing on a stock tranny, thats why i don't think there is going to be that much of a problem with the stronger parts i'm getting made. We will be using an aftermarket shifter with micro switches attached to shift, also with no TCU. He doesn't want it to be push button, he likes to shift.

 

[napkinthief]

Do you have any idea what you are talking about? WTF It is not physically possible to do that. You do know that there are GM trannys running over 1200hp. They have tranny fluid in them too. Auto trannys have been being raced for many years now, and the problem you are talking about has never been an issue. I've been building GM race trannys for 10 years now, and have never seen or heard of that happening before. I don't like to be rude, but you are an IDIOT.

happened to a friend of mine in a mustang, he had nearly 800 whp, and a day at the track seized his tranny, im not like some people, i dont have to waste my time making stuff up

 

[92awdgsx]

Then he obviously didn't have a big enough tranny cooler. First time i've ever heard of that. Its a Ford, that probably why. Usually you will just fry the clutches.

 

[92awdgsx]

I hate to break it to you but, There is no chain in a DSM AT AWD.