TBI to TPI swap
Thread Starter
Member
Joined: Mar 2006
Posts: 130
Likes: 0
TBI to TPI swap
Ok I have a TPI L98 motor but a buddy of mine on http://www.z28.com is wanting to rebuild the TBI and and he found a complete TPI motor that needs a rebuild and possibly the harness but he is concerned that he would have to swap out the fuel pump. Any info on this would be great. Thanks
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The pump will have to be changed, but that's no big deal. Just a few hours of work.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Because the TBI pump doesn't put out enough pressure to suppy the TPI.
If it's a complete TPI system, it will have the right regulator already. The pump doesn't really matter that much, it's whether it can produce enough pressure and flow that determines if it will work.
If it's a complete TPI system, it will have the right regulator already. The pump doesn't really matter that much, it's whether it can produce enough pressure and flow that determines if it will work.
Joined: Feb 2001
Posts: 13,756
Likes: 560
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
To elaborate on what Five said a TBI pump will produce no more than 15psi of fuel (lucky if you get 12). This is assuming stock fuel line size. TPI, like any other MPFI system, requires in excess of 45psi. You will need to swap fuel pumps. I would look at the Walbro units. They are cheaper, stronger, and seem to last longer than GM pumps. I had my walbro 255L pump shipped to my door for $97.
Last edited by ShiftyCapone; Apr 4, 2006 at 08:40 PM.
Thread
Thread Starter
Forum
Replies
Last Post
Sanjay
Engine/Drivetrain/Suspension Parts for Sale
1
Aug 12, 2015 03:41 PM