LT1 question!
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Originally Posted by jerome1979
I'm a neewbie in fuel injection, but i want to know if a Lt1 system can be put onto a ZZ4 engine?
what about optispark vs HEI?
......
what about optispark vs HEI?
......
I'm doing a similar swap, and finding that there are a lot of things that have to be done to install an LT1 manifold on a Gen1 block, like the ZZ4.
An easier and cheaper fuel injection swap would be either TPI or TBI. They can be found everywhere, and are set up for cars with HEI already.
TBI has more potential for power, and is readily available on everything from cars, to vans, to trucks.
To learn more about LT1 swaps, check out http://lt1intake.com/services.htm
Good luck.
Thread Starter
Racer
Joined: Apr 2005
Posts: 465
Likes: 1
From: FRANCE (Lyon)
[QUOTE=Durango_boy].......................
TBI has more potential for power, and is readily available on everything from cars, to vans, to trucks.
...................[\QUOTE]
Why TBI is better than TPI? i alway belive that was TPI better than TBI
good luck too for your swap
TBI has more potential for power, and is readily available on everything from cars, to vans, to trucks.
...................[\QUOTE]
Why TBI is better than TPI? i alway belive that was TPI better than TBI
good luck too for your swap
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Originally Posted by jerome1979
Why TBI is better than TPI? i alway belive that was TPI better than TBI
good luck too for your swap
good luck too for your swap
It has more potential, because a TPI manifold will get winded at high RPMs with a 350. It was originally designed for the 305, and later adapted to the 350.
If you go any bigger than 350 you run into problems with running out or air and fuel for large heavy breathing engines.
TBI is basically an electronically controlled 750 cfm carb. They can be modded to get to over 850 cfm, so adding them to a larger engine is a good option.
Plus, I hear it's easier to reprogram a TBI system for modifications.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Originally Posted by I'm Batman
Not really any difference in reprogramming, at least between the TBI and TPI (and the TPI computer can drive a modified LT1 without the OptiCrap distributor). The TPI intake does get winded early, but the LT1 (and the aftermarket LT1 clones for TPI systems) seem to avoid that problem.
I just wish those after market alternatives were not so expensive. That's why in the end, wanting EFI, I chose a factory LT1 style setup.
Team Owner
Joined: Oct 2004
Posts: 23,831
Likes: 10
From: Springfield MO
St. Jude Donor '07
Not really any difference in reprogramming, at least between the TBI and TPI (and the TPI computer can drive a modified LT1 without the OptiCrap distributor). The TPI intake does get winded early, but the LT1 (and the aftermarket LT1 clones for TPI systems) seem to avoid that problem.
Thread Starter
Racer
Joined: Apr 2005
Posts: 465
Likes: 1
From: FRANCE (Lyon)
If i take an used TBI system, can i add a 4 injector TB in place of 2injector TB and make it run ?!
i need 4 injector because i have a ZZ4 385fast burn with hot cam kit so it develop 430hp@5800 and GM require a 750cfm carb so a 2 bore seems to be "short" in CFM !?
i need 4 injector because i have a ZZ4 385fast burn with hot cam kit so it develop 430hp@5800 and GM require a 750cfm carb so a 2 bore seems to be "short" in CFM !?
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Originally Posted by jerome1979
If i take an used TBI system, can i add a 4 injector TB in place of 2injector TB and make it run ?!
i need 4 injector because i have a ZZ4 385fast burn with hot cam kit so it develop 430hp@5800 and GM require a 750cfm carb so a 2 bore seems to be "short" in CFM !?
i need 4 injector because i have a ZZ4 385fast burn with hot cam kit so it develop 430hp@5800 and GM require a 750cfm carb so a 2 bore seems to be "short" in CFM !?
Do some research, but I'm pretty sure you can get 850 CFM from a modified TBI throttle body.
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Pro
Joined: May 2006
Posts: 576
Likes: 1
From: Baytown Texas
Originally Posted by Durango_boy
I just wish those after market alternatives were not so expensive. That's why in the end, wanting EFI, I chose a factory LT1 style setup.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Originally Posted by Crazy81
Thats why I bought a LS1. After researching the aftermarket for EFI and TBI conversions, I found that I could buy a complete LS1 for about the same amount I would spend on just the aftermarket setup.
Yep...but you can do a TBI conversion from salvage yard parts, and a few hundred for a custom chip.
Much cheaper than a complete LS or even an LT, if done the bone yard way.