TH400 used in 1200 RWHP combo for 2 years teardown.
03-08-2013, 10:17 PM
#1
TH400 used in 1200 RWHP combo for 2 years teardown. We did a teardown today of a TH400 I built a couple of years ago for a Modular Motor powered Cobra.
The car started out running high 8's in the 1/4 mile and is now running 8.teens.
We're working on helping the car get into the 7's by using aluminum drums, lightweight planets, additional rollerizing of parts, some friction reducing mods, and other upgrades.
It was built 2 years ago as an OEM case, Griner G10 valve body, stock shafts, billet forward hub, 36 element Super Drum.
There's been some debate on other forums about clutch pack friction materials, smooth vs. radial grooved vs, waffled facing of the clutches, and other build techniques.
The frictions and steels came out like new.
This unit gets datalogged on passes so we were able to watch shift timing. It is also "bumped" into the staging lights using the transbrake and that creates additional stresses.
It also had borderline low pressure for the power it eventually saw as the wick was turned up on it.
The car started out running high 8's in the 1/4 mile and is now running 8.teens.
We're working on helping the car get into the 7's by using aluminum drums, lightweight planets, additional rollerizing of parts, some friction reducing mods, and other upgrades.
It was built 2 years ago as an OEM case, Griner G10 valve body, stock shafts, billet forward hub, 36 element Super Drum.
There's been some debate on other forums about clutch pack friction materials, smooth vs. radial grooved vs, waffled facing of the clutches, and other build techniques.
The frictions and steels came out like new.
This unit gets datalogged on passes so we were able to watch shift timing. It is also "bumped" into the staging lights using the transbrake and that creates additional stresses.
It also had borderline low pressure for the power it eventually saw as the wick was turned up on it.
03-09-2013, 12:30 AM
#3
Smooth frictions in the forwards and directs. Radial in the intermediate due to the super drum and the availability of clutches with that setup.
All High Energy material.
It's tractor trans/hyd oil. This car spends some time on the brake under load and the tractor fluid handles the sheer and heat better.
All High Energy material.
It's tractor trans/hyd oil. This car spends some time on the brake under load and the tractor fluid handles the sheer and heat better.
03-09-2013, 12:46 AM
#5
As shown here, the stock shaft in a TH400 is amazingly strong. Typically it doesn't break. When it fails, it's usually the cast iron forward drum that actually fails, at the splines where it mates to the input shaft.
This being a turbo combo, it's a bit easier on shafts than an equivalent HP/weight N2O combo, or even N/A combo of equal power.
In SOME instances I recommend the tractor trans/hyd fluid over ATF.
03-09-2013, 01:42 AM
#7
I like to install a billet shaft in the 4L80E at ~750 FLYWHEEL HP or anytime it's in the customer's budget.
I have some guys running my Stage 2 (no billet) builds at over 1000 RWHP but I don't recommend it. Most that are getting away with it are turbo combos.
He's putting down around 1200 RWHP. He goes by fullblown03 on youtube, you can check out his videos. He has several track videos and some dyno vids.
