TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Old Oct 18, 2003 | 09:33 PM
  #1  
D Stroy H8's Avatar
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Joined: Jan 2002
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From: Las Vegas, NV
Car: 1990 Iroc-Z
Engine: L98
Transmission: 700R4
Not your everyday estimation

So - ever since I got my transmission rebuilt up a little, the governor has allowed WOT shifts too high. For instance, the one I notice most is 2nd to 3rd, because it is shifting at about 6100rpm. So, in the near future I am bringing the car into a shop to have the B&M governor recal kit installed, and they will take care of all the necessary trial and error to achieve 5500rpm WOT shifts. About how much ET do you guys think I am losing currently or how much time do you guys think I will gain after adjustment? I was figuring b/w 2 and 4 tenths of a second.
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Old Oct 19, 2003 | 08:24 AM
  #2  
kevinc's Avatar
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Joined: May 2000
Posts: 2,963
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Car: 1982 Z28
Engine: LS1
Transmission: T56
Only if you can answer this simple question:

"How long is a piece of string?"
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Old Oct 19, 2003 | 09:17 PM
  #3  
D Stroy H8's Avatar
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Joined: Jan 2002
Posts: 1,370
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From: Las Vegas, NV
Car: 1990 Iroc-Z
Engine: L98
Transmission: 700R4
Hehehe - ok yeah, good point.

What I am aiming to clarify here, is since the TPIs powerband basically is useless anywhere above 5500 rpm, and if the transmission is pulling the engine up to 6100rpm, I am going to see gains once I get it to shift at 5500rpm. Undeniably correct, no?
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Old Oct 20, 2003 | 03:39 PM
  #4  
kevinc's Avatar
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Joined: May 2000
Posts: 2,963
Likes: 3
Car: 1982 Z28
Engine: LS1
Transmission: T56
I get ya, and yes you should pick up some time on the 1/4 mile. I wouldn't swag more than maybe a tenth or two but very repeatable.
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