auto trans question with turbo 
auto trans question with turbo
I using a 4l80e with a standalone computer for shifting very nice, but dont expect big hp #s but do expect great track numbers. Example Mighyty mouse 8.73 on 17s. Some people think autos are cheating. I call it safety at that power level.
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
TH350 with a billet sprag has made it 5 or so years, most of it behind 700 rwhp, with no failures. Use a tall gear, like 2.50 - 3.00 for highway driveability. Expect to lose 150 rwhp from a comparable M6, but run the same mph but quicker et at the track.
with 300 gears wouldnt it be blowen through the converter the whole time. i was thinkin bout a th400 w a trans break but they dont have lock up converters so id be blowin thriugh the converter on the top side and on the hwy isnt that harsh on the trans
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
A proper turbo converter will be pretty tight. With 1000 ft-lb of torque, it has to be tight to keep the stall speed around 4000 rpm. I'm running a 10.5" converter for that reason.
Sounds like a good set-up, if you want it to be street friendly and keep your overdrive, FLT makes some pretty amazing built 4L60E's that have been proven to run 9's and better. If not another good option for boost TH400 as stated above but it will not be as street friendly with no overdrive. Zombie had a 2.75 gear installed in his and he claims excellent street and highway manors on his 370ci rearmount St-80 set-up.
Trending Topics
Depends on what your opinion of street friendly is and what your budget is like.
If you dont mind bad gas mileage and turning some rpm's on the expressway then go th400.
If you want something more streetable and money is tight I would do a 4l60e from a proven company. If you have some money to spare do a 4l80e and never look back.
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
4L80E! Strength of 400 with an OD. The more power you make, the better the parts have to be to hold up to that power, so it won't be cheap! A 4L60E would be on the ragged edge, where a 4L80E is right at home.
I'm the odd man out though since very few are willing to try my crazy ideas.I'm a cheap bastard though which is why I tried my setup (which works very well to everyones surprise). The other solution would be a 4L80 if you have the $$$.
So is 20+ MPG and turning 2400 RPMs at 70MPH with a TH400 and a 3600 RPM stall considered good. That is what my car is doing I'm the odd man out though since very few are willing to try my crazy ideas.
I'm a cheap bastard though which is why I tried my setup (which works very well to everyones surprise). The other solution would be a 4L80 if you have the $$$.
I'm the odd man out though since very few are willing to try my crazy ideas.I'm a cheap bastard though which is why I tried my setup (which works very well to everyones surprise). The other solution would be a 4L80 if you have the $$$.
dang 20 plus mpg is great to me im gona be running a 28 tall tire not sure what your running but your setup would be nice. unforchanantly im not rich so the th400 will be my rought. what converter is that and what gears?
scared of a 4l60e my buddy had to rebuild his bout once every 3 months with 400hp camaro. and the 4l80e would cost me bout five grand wouldnt it?
It's a PTC converter that Dusty Bradford spec'd out for my setup. It stalls around 3600 but is nice and tight for normal driving. I'm running 28" tires with 2.75 rear gears, I cross the traps at 6900 in 2nd gear. If you do a setup like this with a transbrake, i'd have the tranny builder keep the 2nd gear intermediate band for safety incase you forget to shift to 3rd after a pass. Dont' want the drum popping out on you.
It's a PTC converter that Dusty Bradford spec'd out for my setup. It stalls around 3600 but is nice and tight for normal driving. I'm running 28" tires with 2.75 rear gears, I cross the traps at 6900 in 2nd gear. If you do a setup like this with a transbrake, i'd have the tranny builder keep the 2nd gear intermediate band for safety incase you forget to shift to 3rd after a pass. Dont' want the drum popping out on you.
thanks man been alot of help
$5000.00?!? 
"If you want to play, than you have to pay!"