disregarding comfort, how much can you put through a 5hp-19 auto trans?

[rockcandy]

99% for 1/4mile racing purposes...

I know a few attempts have been made to put big power through an auto with failed results. Things like "smooth shifts" destroy auto transmissions under high power. Has anyone made an attempt with valve body mods, higher stall converter, full line pressure, and hardwired it for a shift box? I've got 4 of these I'm willing to blow through sometime in the future to find out....

[hodrosS42001]

99% for 1/4mile racing purposes...

I know a few attempts have been made to put big power through an auto with failed results. Things like "smooth shifts" destroy auto transmissions under high power. Has anyone made an attempt with valve body mods, higher stall converter, full line pressure, and hardwired it for a shift box? I've got 4 of these I'm willing to blow through sometime in the future to find out....

I know you have been trying to find this out, and I am interested as well. There is a post on Audiworld somewhere of a guy with a Tiptronic and k04's with meth and electronic dumps and fueling etc who held 22psi on pj k04's.. he had a updated torque converter and valve body.. I dont think the transmission clutches were built though... he ran between a 12.1-12.2s 1/4 that was the biggest power I have seen in all my research put through a tiptronic... and it probably didnt last long.

[DxC]

I have a stage 3 auto that's just starting to undergo tuning. I have 517 tc and 517 vb. giac tip chip ... But stock clutch packs and tranny. We'll see

[dannyn424]

theres a couple 517's out there :).. BTW PSA, IPT sucks...

[rockcandy]

BTW, I'm talking 700whp+.

Not ko4 power levels.

[DxC]

Lol well start at k04 power levels first. They aren't even lasting at 400whp why jump to 700

[Scotty@Advanced]

BTW, I'm talking 700whp+.

Not ko4 power levels.

Perhaps with custom carbon or kevlar clutch packs and real high line pressure, but high line pressure will split the clutch drums. At these power levels it will be a very expensive experiment.

[rockcandy]

Perhaps with custom carbon or kevlar clutch packs and real high line pressure, but high line pressure will split the clutch drums. At these power levels it will be a very expensive experiment.

Probably, but unless you know of an awd auto trans that will hold up under our cars, its worth a shot. If I'm going to go through $3k worth of clutches and synchros every season may be the story of my life, but an auto to pull better times would be killer.

[rockcandy]

Lol well start at k04 power levels first. They aren't even lasting at 400whp why jump to 700

Ko4 power is for the birds. I want an auto trans solution.

[hodrosS42001]

If there was a 3-5k trans solution to hold 400+ awhp reliably I feel like it would have been done already.. there is a market. There are alot of A4/S4 Tiptronics out there that wouldn't mind that cost to keep up with the big boys.

[rockcandy]

If there was a 3-5k trans solution to hold 400+ awhp reliably I feel like it would have been done already.. there is a market. There are alot of A4/S4 Tiptronics out there that wouldn't mind that cost to keep up with the big boys.

Not so sure. It takes some dedicated folks to drop $5k on an iffy solution. If drums breaking ends up being the wall, I don't see why that can't be handled with the know how and equipment. Keep in mind 99.9% of audi owners wouldn't want to drive their car with the trans I imagine it taking. The amount of whining I've come across in the auto threads about shift quality makes that apparent.

[s4cappa]

didn't someone try to do this before i believe the car was being built at 034 he dumps massive money into a trans and nothing ever came from it.

[dannyn424]

517 told me at the time the trannies were the same ones in the porsche turbos of that era and that they built one for a wms porsche turbo......350+ whp in an auto is fast as there are perfect shifts and you just stab the throttle

[airjawed]

I'm with you on this one.... we need to be able to run big power in an auto. Just look at all the cars coming out now with 4 second 0-60 mph... they aren't all manuals.

I think a lot of the attempts at running with more power were failed due to not really being a comprehensive attempt at it. Wish I understood it more but I don't have access to any transmissions. What I do see in other applications is that the damage usually happens during power transitions. This can come in the form of from the engine side or the reverse can also happen.... hit a bump or a landing and the trans gets a 'whack' from the other end.

I used to go throw primary gears in my RC car applications a lot. I then when to a brushless motor setup and that actually made more power. But I went through fewer gears. Why? One was the motor itself had less inertia in it. The other reason is that the gearing ratio was different. This put less strain forward and backward through the 'trans'.

[Scotty@Advanced]

517 told me at the time the trannies were the same ones in the porsche turbos of that era and that they built one for a wms porsche turbo......350+ whp in an auto is fast as there are perfect shifts and you just stab the throttle

The 996 911 turbo got something entirely different.

The 5HP19HL which is a very different trans from the Audi 5HP19FL was used in the N/A 911 porsche cars up to ~2002. The 5HP19FL was used in the boxster.

The 5HP19HL in the rear engine cars was so troublesome that Porsche went to the turbo transmission in most cars after 2003.

[hodrosS42001]

The 996 911 turbo got something entirely different.

The 5HP19HL which is a very different trans from the Audi 5HP19FL was used in the N/A 911 porsche cars up to ~2002. The 5HP19FL was used in the boxster.

The 5HP19HL in the rear engine cars was so troublesome that Porsche went to the turbo transmission in most cars after 2003.

What would be the options if you just went rwd?

[rockcandy]

What would be the options if you just went rwd?

turbo 400. I'd pay to have an adaptor made for it if I knew I could get the car to hook up. For street use though, awd is king which is why I want to go down this road at some point.

[hodrosS42001]

turbo 400. I'd pay to have an adaptor made for it if I knew I could get the car to hook up. For street use though, awd is king which is why I want to go down this road at some point.

yeah it would be pointless. There has to be another trans that would fit with an adapter plate.

[dannyn424]

Thanks Scotty.

[rockcandy]

yeah it would be pointless. There has to be another trans that would fit with an adapter plate.

Rwd can hook up. It isn't pointless. It just makes the "you get what you pay for" rule very obvious for tires. My problem is the ifs designed to operate as an awd application. The angles are all wrong for 2wd. Maybe my long term solution is a gm trans and a solid axle mated to an audi powerplant. I don't want to see it going that direction though....

[airjawed]

2 engines.... 2 trans...

I think someone did a build with an engine in the back of an avant. Do that but leave and engine in the bay up front. Joking.

[Scotty@Advanced]

What would be the options if you just went rwd?

Going rear wheel drive you have just about any front engine rear drive transmission available..

700R4, E4OD, C4, C6, Torqueflight, Allison.. All can be modified for huge power.

[Timtheguru]

2 engines.... 2 trans...

I think someone did a build with an engine in the back of an avant. Do that but leave and engine in the bay up front. Joking.

I remember seeing about 15 years ago someone doing that in a tiburon.

http://www.modifiedcartrader.com/for-sale.aspx?i=15435

[ChrisGS4]

A standalone computer for a dual clutch trans would be awesome. Constant smooth acceleration and staying in boost the whole time should be possible. I would imagine the programming would be a very high budget deal though.

[8520]

Disregardcomfort_aquirehp.jpg

[Scotty@Advanced]

Another option is to use a 5hp24, it can handle more power but it's not a drop in by any stretch of the imagination.

[hodrosS42001]

can't the 7speed dual clutch from an old tt or something fit? That has to be a small transmission....

[erisch]

can't the 7speed dual clutch from an old tt or something fit? That has to be a small transmission....

I think that thing could barely handle 250ftlb, let alone the 700 he wants to push through there.

[hodrosS42001]

I think that thing could barely handle 250ftlb, let alone the 700 he wants to push through there.

Even with a better set of clutches? Or the newer dual clutches in like the ttrs.. could be the answer. Some newer dual clutch with an adapter.

[erisch]

For his project you'd probably want the one from the Veyron, I heard it's pretty cheap ;)

[hodrosS42001]

For his project you'd probably want the one from the Veyron, I heard it's pretty cheap ;)

Might as well build a new car all together. Or once again just buy an e55+supercharger kit and sun your 9's

[GunSupplier]

Even with a better set of clutches? Or the newer dual clutches in like the ttrs.. could be the answer. Some newer dual clutch with an adapter.

The TT (and TT-RS, Golf GTI, MKV R32, etc.) all have a transverse engine layout and use Haldex AWD, whereas all Audi S4s have a longitudinal layout and use a permanent Torsen based system. Completely different engine/transmission layout.

That's part of the reason there are so few "theoretical" transmission choices that work. Up until the B8 S4 with S-Tronic, VW/Audi did not produce a longitudinal dual clutch automatic (I'm not counting the Veyron for obvious reasons).

The only autos available prior to the S-Tronic were all traditional torque converter ZF units. The "strongest" ZF unit that Audi has put into a road car is most likely the 6HP26A that went into the C6 RS6 which produces 479 lb-ft. They also used it in the Continental GT of which some editions produce over 500 lb-ft.

Like Scotty said about the 5HP24, though, good luck getting it to fit.

*Edit*
I should say that there will be versions of the ZF 8HP (the 8HP90) coming out that can handle as much as 730 lb-ft of torque, but again, not really realistic whatsoever.

[naudlee]

merc trans... anyone figured a way?

[hodrosS42001]

merc trans... anyone figured a way?

This