TurboZ28408

iTrader: (18)

Th400 guys .. im having an issue with my th400 .. brand new coan th400 with pro torque 3200 stall converter. 9" rear with 3.00 rear end gears new lq4 iron block, dynos 632 in 2nd gear, 3rd gear dyno sees less mid range and same peak. driving on the street 1st feels great, 2nd feels great but 3rd feels like its just there for the ride and the cars not accelerating very heavily at all. is your car like this or should i look into loose converters or possibly a slipping transmission ?

OUTLAWZ RACING

iTrader: (9)

Looks like it looses boost then picks back up. Id say converter slip it may not be able to hold the power.

jay_rich

iTrader: (8)

Wierd, my TH400 pulls like a rapped ape in all gears. I have a looser stall too, 3600 superstreet fighter tci.
mine made similar numbers but on 8psi through my old 383 LT1.

Whats your setup?

Jay

TurboZ28408

iTrader: (18)

built 6 liter, 3.00 rear end, ST80 turbo 15 psi, patriot heads, 60lb injectors, rails, 044 fuel pump, 230/232 cam

MaxxMitchell

iTrader: (15)

on the street, is the boost/timing staying the same in 3rd as it is in 2nd? My guess is the converter as well. My car doesnt loose anything going into third gear.

TurboZ28408

iTrader: (18)

correct .. boost and timing is the same through all gears

black98ws6ta

iTrader: (77)

I would take it to the track, and make some assessments based on what it runs. Every car Ive ever been in feels faster in a lower numerical gear pending traction.

slow67

iTrader: (2)

How big is the exhaust side of the ST80? It is possible it has backpressure issues as well.

TurboZ28408

iTrader: (18)

ST-80 turbo that has a T-4 housing, race cover and 1.00 ar

Zombie

iTrader: (2)

My 3rd feels just a tad weaker than 2nd gear.

cjmatt

iTrader: (4)

any knock in 3rd gear that would cause it to pull timing? 1:1 with 3.00 gears is pretty high of a ratio. what size tire you got on it? Are you sure it doesnt just feel slower even through youre picking up good mph? Is it making the right amount of boost in 3rd? Your turbo could be too big and out of its efficiency range at lower rpms

cjmatt

iTrader: (4)

oh also, you get torque multiplication running a dyno in anything other than a 1:1 trans ratio. You have to make sure that the dynojet is calibrated for the correct gearing if its in another gear or itll read differently

TurboZ28408

iTrader: (18)

they asked me what gear it was setup for so im pretty sure that it was inputted into the equation, but ill ask to confirm