why can't turbo th400 cars be dyno'd?
#21
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I've been more and more interested in th400 cars lately, but unfortunately I know very little about them. I could just call and ask what a shop would recommend, but i like to do a lot of research before i make any decision so that I know what they are talking about. Anyone got any links that explain in detail what all the options do or how they work?
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it seems to me like the TH400 is an amazing tranny because a lot of the experienced people on this site have them, but man, i just cant get away from my M6 on the street. BUT, when i do a race car when i graduate college, it will def have either a TH400 or a glide. i like reading about the TH400's just in case i ever mught wanna switch my M6 later in the years to one. good comments on this thread and a lot of knowledge to be harnessed
#23
I have a TCI Competition TH400 in my car. RMVB, T-Brake, the works. I plan to hit the dyno several time since I dont seem to leave anything alone. I have been told several times to always leave the trans in 3rd after a pull and let the rpms fall before down shifting. Same goes for the street unless like said above you downshift from 3rd to 2nd on the throttle. I dont run a super huge stall, Just a Yank 3000. I hope it doesnt explode but if it does oh well. I will go back to a full manual 4L80E and get my OD back .
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Originally Posted by Pro Stock John
Jim @ Speed Inc. seems pretty adept at dynoing T400 cars. I have not personally watched him dyno a T400 in a while, but I think he's very careful to load the drivetrain before flooring it. That being said, many dyno operators would point out that a T400 car will dyno 100rwhp less than a similar M6 car.
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Originally Posted by HAMRHEAD
That's why dyno numbers only tell half the story. Plenty of people out there make claims off just dyno numbers.
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Originally Posted by iroctt
Wonderbread
I'am curious he dropped from 10.4 to 9.7 ET how did the trap speed change?
I'am curious he dropped from 10.4 to 9.7 ET how did the trap speed change?
#31
Originally Posted by andereck
Powerglide. Ask for it by name. T400's are HP sponges and only slightly better than a C6.
#35
Originally Posted by Wonderbread
Ive seen exactly that happen, a board member, GIMP98TNT had a M6 in his car with spray, the car with the M6 made 435ish RWHP NA and 650ish on the bottle,after the car was dynoed with he M6 the next year he changed to a TH400 and changed nothing else but the trans, put it back on the same dyno and the car only showed 350 RWHP N/A and 500 on the same nitrous shot/tune. Even though the numbers dropped, his best time with the 6 speed was 10.40, now with the TH400 and a brake the car has a best of 9.73.... a little more nitrous has help that number but the trans made a huge diff.
#36
I ran a powerglide in my small block street car for quite a while and some of my buddies gave me **** and said the car would be even quicker with a 3 speed. I picked up a great deal on a fresh 400 and had a friend disasseble it for a TCI brake. The powerglide was already running a turbo spline converter and I borrowed a crossmember and driveshaft from a friend for the 400 in the Camaro.
Driving the car was a bit more fun with an extra gear but I didn't dig the reverse pattern and 2nd gear overrun was weird. The TCI brake will apply reverse in any shifter position, including park!
Dragstrip performance was disappointing but expected. The car went only .05 quicker and lost 1.5 mph. In my way of thinking what I gained in ratio I lost in parasitic drag. I just love the powerglide I suppose and they're dirt simple. Your mom could put one together.
YMMV
Mike: Wow! I had no idea your car was that fast.
Driving the car was a bit more fun with an extra gear but I didn't dig the reverse pattern and 2nd gear overrun was weird. The TCI brake will apply reverse in any shifter position, including park!
Dragstrip performance was disappointing but expected. The car went only .05 quicker and lost 1.5 mph. In my way of thinking what I gained in ratio I lost in parasitic drag. I just love the powerglide I suppose and they're dirt simple. Your mom could put one together.
YMMV
Mike: Wow! I had no idea your car was that fast.
#37
Originally Posted by squealingtires
curiosity has caught me. What exactly happens internally in the TH400 during the 3rd to 2nd down-shift? What is the failure? What is the fault?
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Originally Posted by squealingtires
curiosity has caught me. What exactly happens internally in the TH400 during the 3rd to 2nd down-shift? What is the failure? What is the fault?
http://www.chevelles.com/forums/show...1&postcount=19