Paragus77

Is it possible? My friend has a Caprice, and I think it would be pretty bad *** with TPI ontop of it.

tenpin842

What year Caprice?
The newer ones have LT1 motors in them. In that case....leave the LT1 in it.

88SS6SPEED

iTrader: (2)

Sure it is possible and pretty easy for that matter. Like mentioned, if it is a94-96 it would have either an L99 4.3L LT-1 look-a-like, this would be the code on the SPID located in the trunk lid. This the white sticker located on the roof of the trunk. If it is the 5.7L LT-1, it would also be on that SPID. If this Caprice is an 87-93 model, with either the LO3 5.0L TBI or the LO5 5.7L TBI, it would be really easy to convert it to a TPI, and with the already existing TBI harness. It just takes some meticulous re-pinning of the TBI harness and the (Green or Yellow 32 pin 7730 connector) from the 90-92 TPI 7730 ECM, and some minor re-wiring of the under-hood wires, and it will work fine. I've done a few of them, and a few LO3 TBI RS Camaro's. There is a plethora of information on such swaps, and just simply ask for help with well thought out questions, and you will be very successful in your project. HTH's.

Paragus77

It's an 88, i guess my next step is a search, lol.

thx for the quick response

Kevin91Z

iTrader: (1)

A Caprice/Impala forum would be your best bet. I'm sure its been done before.

Toyota h8r

without getting rid of the swirlport heads your porlly not going to see much to any performance gains.....

i know because guy i know slapped a tpi setup on a 89 fullsized blazer and got a ton of tq added and lost top end hp

tried bumping fuel pressure/tuning it/advanced timing...everythign and still ran like poo. Ended up pulling the tpi off and running a holley carb and never looked back. I may even do the same after adding up how much its gonna cost to build my 327tpi project up from stock setup right now

Paragus77

I don't think it is a TBI, he just rebuilt the carburetor, which TBI's don't have, right? I'm gonna check the VIN today to see what the car came with, be cause it definitely still has the original engine.

Toyota h8r

oh i thought i read it was a 89 which is all tbi(friend owns a junkyard...lol)

but yah 88 had the LG4/305 and a weak 350 carb'd(smog motor).

putting a tpi unit on either motor will see more tq but almost no gain in horsepower due to the tpi is lacking in cfm flow. iirc tpi flows like 250-300cfm stock and a quadrajet flows in the neighborhood of 750cfm

id stick with the carb if your looking for performance and having to spend a ton of money to upgrade from stock tpi later to match a carb's performance

Paragus77

so his car would benefit more a performance carb?

Toyota h8r

if the owner of the car has a boat load of money id go tpi.

but since the car is a carb'd car already id suggest looking into a dual plane edelbrock performer rpm intake and edelbrock 600cfm carb


also, is this a dd car or a weekend bruiser? kinda big detail

Paragus77

DD, but he does not care about gas mileage or anything, he just wants to smoke his tires like my LB9, lol

FormulaL98

Then tell your buddy to look for a good dual-plane manifold and a carb to to put on it, a cam swap too (hydrolic flat tappets can be had for about 100 bones with the lifters). Steeper gears could be had from the junkyard, as well as possibly a used posi. A little 100 shot of nitrous would do that Caprice right also!

Toyota h8r

cool someone agrees with me lol

Paragus77

Awright! We'll be hunting riceboys in that boat, er beast, in no time! lol.

Killerzracing71

Im in the process of that conversion into a 92 Caprice Wagon, its been done before found it on a forum somewhere.

But thats irelavent since your freinds isnt the same anyway

Ursula91

can you direct me to where where I can find specific information in regards to the re-pinning and harness mods required to do this. Please

to be more specific I want to swap a 91 tpi 350 into a 91 Caprice 5.0.

Tuned Performance

iTrader: (92)

746 to 730 ?

https://www.thirdgen.org/forums/tpi/...d-density.html

Fred SS

iTrader: (3)

You should also check out a website named "chevythunder.com". Allot of TPI swap information there.

Good Luck.

Vader

Been there:



Done that:



The real benefits are better reliability, more consistent starting and running, more torque available for heavy bodies with lower (numerical) rear gearing, better cruising fuel mileage, and cleaner operation. Presuming the B-Body already has a TH700-R4 transmission, the low ratio first gear should help overcome almost any low ratio rear axle, and the OD range of the trans is going to help a lot with cruise economy. If the car has a TH200-4R (1988 may be a little late for that trans) the rear gears really need to be investigated.

If the car has a ridiculously low axle ratio, as some did, changing to 3.08 or slightly higher gearing will help the low end.

Fast355

iTrader: (2)

My 88 Fleetwood had the Vin 9 307 and a 200-4R with 2.53 gears.

Ursula91

So going from the tbi to tpi in the b body are the throttle cable and kick down cables interchangeable as well?

Tuned Performance

iTrader: (92)

The cables will be to short.

Ursula91

where can I find appropriate cables?

Tuned Performance

iTrader: (92)

For the throttle cable you might be able to use one off a thirdgen or lokar.
the throttle cable will be determined by year 85-88 or 89-92 wrap around style.
rockauto.com sells the tv cable or you can do lokar for both. The lokar uses a stud so if you use a throttle cable by them you need there tv cable.

Ursula91

ANyone out there who has used the Lokar what lengths and or part #’s?? Please and thank you

Tuned Performance

iTrader: (92)

For throttle cables they have 24 or 36 and are cut to fit if you want it shorter.

https://www.lokar.com/throt-cable-kickdowns.html