4.11 or 3.73 GEARS?
Drifting
Joined: Apr 2005
Posts: 1,918
Likes: 451
From: Central NJ
An 8" converter is good to about 800 hp after 800hp you would move up to a 9" and so on.
Thread Starter
Intermediate
Joined: Dec 2012
Posts: 30
Likes: 0
TEKTRANS
Do you happen to know what diameter torque convertor did the TH400 come with?
Taking into consideraion your recommendation of ideal 2700-2800 stall, I was looking at the convertiors available on Summit Racing and almost all are either 2400 or 3000. Given that I have a relatively mild cam (256/262 advertised duration) would the 3,000 one be too much?
Also, how beneficial is it to change the flexplate at the same time of the convertor? Some of the combo packages also sell the convertor with a deep tranny pan...not sure how much useful this is though for what I am trying to accomplish (quicker acceleration).
Thanks
Do you happen to know what diameter torque convertor did the TH400 come with?
Taking into consideraion your recommendation of ideal 2700-2800 stall, I was looking at the convertiors available on Summit Racing and almost all are either 2400 or 3000. Given that I have a relatively mild cam (256/262 advertised duration) would the 3,000 one be too much?
Also, how beneficial is it to change the flexplate at the same time of the convertor? Some of the combo packages also sell the convertor with a deep tranny pan...not sure how much useful this is though for what I am trying to accomplish (quicker acceleration).
Thanks
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
ScottyP/TEKTRANS:
First of all, thanks to you both on your insight, I appreciate it.
I'm taking note of the advice on the transmission upgrade (700r4) for future modifications.
I did have a follow-up question to TEKTRANS' question as to when I'd like my motor to waken up. Ideally I'd like that to happen at launch. My car idles around 600 rpm. Taking into account the my L75 stock camshaft specs (below in bold), what torque convertor should I use, based on my stock engine, to help me go 0-60 quicker? Would it be a noticeable improvement such as lower gearing? Aside from the extra heat in the transmission, any downside?
I read an article on JEGS which said that, "most street-driven performance cars with 350 foot pounds of torque or more (mine has 350lbs of torque) need a 2400 RPM unit...."
Thanks again guys!
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range:600-4,800
Intake Duration at 050 inch Lift:194
Exhaust Duration at 050 inch Lift:203
Duration at 050 inch Lift:194 int./203 exh.
Advertised Intake Duration:262
Advertised Exhaust Duration:256
Advertised Duration:256 int./262 exh
First of all, thanks to you both on your insight, I appreciate it.
I'm taking note of the advice on the transmission upgrade (700r4) for future modifications.
I did have a follow-up question to TEKTRANS' question as to when I'd like my motor to waken up. Ideally I'd like that to happen at launch. My car idles around 600 rpm. Taking into account the my L75 stock camshaft specs (below in bold), what torque convertor should I use, based on my stock engine, to help me go 0-60 quicker? Would it be a noticeable improvement such as lower gearing? Aside from the extra heat in the transmission, any downside?
I read an article on JEGS which said that, "most street-driven performance cars with 350 foot pounds of torque or more (mine has 350lbs of torque) need a 2400 RPM unit...."
Thanks again guys!
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range:600-4,800
Intake Duration at 050 inch Lift:194
Exhaust Duration at 050 inch Lift:203
Duration at 050 inch Lift:194 int./203 exh.
Advertised Intake Duration:262
Advertised Exhaust Duration:256
Advertised Duration:256 int./262 exh
Scott
Drifting
Joined: Apr 2005
Posts: 1,918
Likes: 451
From: Central NJ
TEKTRANS
Do you happen to know what diameter torque convertor did the TH400 come with?
Taking into consideraion your recommendation of ideal 2700-2800 stall, I was looking at the convertiors available on Summit Racing and almost all are either 2400 or 3000. Given that I have a relatively mild cam (256/262 advertised duration) would the 3,000 one be too much?
Also, how beneficial is it to change the flexplate at the same time of the convertor? Some of the combo packages also sell the convertor with a deep tranny pan...not sure how much useful this is though for what I am trying to accomplish (quicker acceleration).
Thanks
Do you happen to know what diameter torque convertor did the TH400 come with?
Taking into consideraion your recommendation of ideal 2700-2800 stall, I was looking at the convertiors available on Summit Racing and almost all are either 2400 or 3000. Given that I have a relatively mild cam (256/262 advertised duration) would the 3,000 one be too much?
Also, how beneficial is it to change the flexplate at the same time of the convertor? Some of the combo packages also sell the convertor with a deep tranny pan...not sure how much useful this is though for what I am trying to accomplish (quicker acceleration).
Thanks
If given the choice of a 2400 stall or a 3000 with your motor I'd have to agree with Scottyp99 and go for the lower 2400 stall speed.
New sfi flexplate at that power level I dont think is neccessary. If the trans starts running hot you could always look into a finned deep trans pan later.
