carb to tpi is it worth it?
carb to tpi is it worth it?
A friend of mine is parting out his camaro 87 has tpi and only wants $500 he says it easy to change over however i dont know if im capable or how much a repair shop woud charge is this a job that would take a few days i have reman engine in it so its not stock 85 camaro
Member
Joined: Nov 2003
Posts: 257
Likes: 0
From: Wellington, Kansas
Car: 92Z28
Engine: L98
Transmission: A4
I wouldn't suggest the swap. It will require a bunch of wiring, troubleshooting, and cost you more than the car will be worth. I would suggest buying a TPI car if you want TPI.
JMO,
Charlie
JMO,
Charlie
Senior Member
Joined: Sep 2000
Posts: 560
Likes: 1
From: Austin TX
Car: 91 RS Convertible
Engine: 355
Transmission: 700R4
Axle/Gears: 2.73 peg leg
It's really more involved than I thought it would be which is why I abandoned the project after a few months of getting nowhere fast. You really need a donor car for all the necessary parts that you forget (sensors, relays, throttle/tranny cables, VSS, etc.). If you can buy the whole car from your friend, that would be the best option, then you could sell off what you didn't need to do the swap after it was done.
Supreme Member
iTrader: (1)
Joined: Feb 2000
Posts: 7,964
Likes: 4
From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
No need to buy the entire car, just get the TPI, every sensor, all the wiring, every relay, etc...
It looks very modern once you do the swap,
Before,

After,

You will need a fuel pump and you can use the sender and pump from your friends car or you can do as I did and put an inline pump under the car.
It looks very modern once you do the swap,
Before,

After,

You will need a fuel pump and you can use the sender and pump from your friends car or you can do as I did and put an inline pump under the car.
Last edited by Zepher; Jan 13, 2004 at 11:48 PM.
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Supreme Member
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From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
Originally posted by JRoy91RS
I gotta say, that's a very clean-looking swap. It looks stock. Nice job
I gotta say, that's a very clean-looking swap. It looks stock. Nice job
I put about $2200 or so into the car while doing the swap.
I put the TPI heads on, a Crane Cam, SD ecm, bought a programmer, did suspension and exhaust, wheels and tires.
Here is a vid of the car with the TPI on it,
http://www.transamws6.com/video/ZepherWS6.mpg
Senior Member
Joined: Nov 2003
Posts: 586
Likes: 1
From: Gary, In USA
Car: '85 Camaro
Engine: LG4 305
Transmission: T-5
If you are just going to swap that only it is probably not worth it. If you are using that as your jumping off point for more upgrades (power adder(s))then it is probably very reasonable.
If it works then you get a huge boost up the learning curve as you will learn all kinds of stuff doing it.
If it doesn't work, then you will have learned a lesson at $500 that costs others 2-4x as much to learn.
Plus if you friend is saavy enough to do a clean removal of EVERYTHING, then you already have someone with some experience with what goes where.
I've never done it, but I am looking forward to it for the jumping off point with the 350 I will be purchasing.
If it works then you get a huge boost up the learning curve as you will learn all kinds of stuff doing it.
If it doesn't work, then you will have learned a lesson at $500 that costs others 2-4x as much to learn.
Plus if you friend is saavy enough to do a clean removal of EVERYTHING, then you already have someone with some experience with what goes where.
I've never done it, but I am looking forward to it for the jumping off point with the 350 I will be purchasing.
Supreme Member
iTrader: (1)
Joined: Feb 2000
Posts: 7,964
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From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
I was able to install my TPI onto this guys Camaro in about 8 hours. That included removing the carb setup, installing an inline pump, and running some fuel lines. Oh we also had to drill the intake for the earlier style heads too.
Doing it your very first time will probably take a few days or so.
I worked on mine for a looong time, but I was doing more than a TPI swap.
Doing it your very first time will probably take a few days or so.
I worked on mine for a looong time, but I was doing more than a TPI swap.
Joined: Jul 1999
Posts: 12,089
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
I wouldn't suggest the swap. It will require a bunch of wiring, troubleshooting, and cost you more than the car will be worth. I would suggest buying a TPI car if you want TPI.
It's really more involved than I thought it would be which is why I abandoned the project after a few months of getting nowhere fast. You really need a donor car for all the necessary parts that you forget (sensors, relays, throttle/tranny cables, VSS, etc.). If you can buy the whole car from your friend, that would be the best option, then you could sell off what you didn't need to do the swap after it was done.
If this is whats considered hard, we got issues guys.
-- Joe
Member
Joined: Nov 2003
Posts: 257
Likes: 0
From: Wellington, Kansas
Car: 92Z28
Engine: L98
Transmission: A4
Originally posted by anesthes
What??
You guys are lazy. Months? I sold a TPI setup to my buddy brad, and he got everything working in his '69 camaro over a weekend. "Months?"
If this is whats considered hard, we got issues guys.
-- Joe
What??
You guys are lazy. Months? I sold a TPI setup to my buddy brad, and he got everything working in his '69 camaro over a weekend. "Months?"
If this is whats considered hard, we got issues guys.
-- Joe
Senior Member
Joined: Sep 2000
Posts: 560
Likes: 1
From: Austin TX
Car: 91 RS Convertible
Engine: 355
Transmission: 700R4
Axle/Gears: 2.73 peg leg
Yeah, anesthes, I don't think you can really call me lazy when I spent every spare moment I could swapping out an engine and trying to get the induction working properly when I had almost no help and little experience and inadequate tools. If it weren't for the guys on this board helping me I would've gotten nowhere at all with my swap. Part of my problem was that I bought a gimp wiring harness and then tried to adapt it to make it work. I built most of my car with my bare hands with hardly any help, and I worked hard and researched hours. I don't think you can say that exemplifies laziness. Looking back, I would've done things much differently, and I think that now the swap wouldn't be as difficult because I would buy all the correct parts first and would definitely go speed density, but now I can't afford to so I am sticking with carb.
Supreme Member
iTrader: (1)
Joined: Feb 2000
Posts: 7,964
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From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
I got a lot of help with my swap from the members here on the board as well as a ton of help from John Millican.
I spent quite a bit of time on the phone with John trying to diagnose some issues I had. He also did the MAF to SD harness conversion for me.
I spent quite a bit of time on the phone with John trying to diagnose some issues I had. He also did the MAF to SD harness conversion for me.
Joined: Jul 1999
Posts: 12,089
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Not lazy at all and don't like the attitude. I just don't see doing that swap as being practical when the TPI cars are so plentiful and cheap.
Yeah, anesthes, I don't think you can really call me lazy when I spent every spare moment I could swapping out an engine and trying to get the induction working properly when I had almost no help and little experience and inadequate tools. If it weren't for the guys on this board helping me I would've gotten nowhere at all with my swap. Part of my problem was that I bought a gimp wiring harness and then tried to adapt it to make it work. I built most of my car with my bare hands with hardly any help, and I worked hard and researched hours. I don't think you can say that exemplifies laziness. Looking back, I would've done things much differently, and I think that now the swap wouldn't be as difficult because I would buy all the correct parts first and would definitely go speed density, but now I can't afford to so I am sticking with carb.
If your saying "the hardest part is collecting all the parts" well then ok sure. But if he has everything, whats the big deal?
I've done the carb to TPI conversion, I've converted from MAF to SD, and just went from '730 SD to '749. I don't know what the big deal is. And i'm not even a "real" mechanic.
I got a lot of help with my swap from the members here on the board as well as a ton of help from John Millican.
I spent quite a bit of time on the phone with John trying to diagnose some issues I had. He also did the MAF to SD harness conversion for me.
I spent quite a bit of time on the phone with John trying to diagnose some issues I had. He also did the MAF to SD harness conversion for me.
In the end, my point is please. If someone asks for help or whatever in doing something, don't shoot it down. If you can't help them, or give them optimistic information don't bother at all.
I think he should get it. $400.00 is a good deal if he gets EVERYTHING from the donor car (including trips back if he forgets things).
Then his next mod might want to be a SD conversion (took me about an hour). Then perhaps a HSR after that, and put the TPI setup on ebay for $200.00 or so.
These arn't new ideas....
-- Joe
If you will be swapping from CC carb to TPI, yes, it would be very much worth it (priced a replacement CC carb yet?)
Expect about a week down time on the car (always estimate over in case of surprises)
Find out what all sensors you'll need and cables (trans, throttle, etc) and start slowly. Put the TPI on the engine but don't tighten it up, leave it loose. Then run the wiring by just laying it out on the engine and hook to sensors and such (to figure out the routing you need). Next remove (don't cut) the old engine wiring harness and stary perminantly installing the new one. Then remove the TPI, put the gaskets on and install it perminantly and hook up the wiring to it and plumbing.
For a nice slow easy approach like this I would estimate 3 days, but give yourself a week incase of problems.
Expect about a week down time on the car (always estimate over in case of surprises)
Find out what all sensors you'll need and cables (trans, throttle, etc) and start slowly. Put the TPI on the engine but don't tighten it up, leave it loose. Then run the wiring by just laying it out on the engine and hook to sensors and such (to figure out the routing you need). Next remove (don't cut) the old engine wiring harness and stary perminantly installing the new one. Then remove the TPI, put the gaskets on and install it perminantly and hook up the wiring to it and plumbing.
For a nice slow easy approach like this I would estimate 3 days, but give yourself a week incase of problems.
Joined: Jul 1999
Posts: 12,089
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Another recommendation:
There are some places where the harness connects to the firewall connector block. I'd completely remove the harness, then lay it out on a table.
Then lay out the completly removed TPI harness. Any connections to gauges/fuse power/etc splice from your existing connector block ON THE TABLE. BE careful, label stuff, etc. When you're done you'll have that factory tpi look, and you won't spend $3,000 finding a car as good as yours, but with TPI as oddly suggested above..
-- Joe
There are some places where the harness connects to the firewall connector block. I'd completely remove the harness, then lay it out on a table.
Then lay out the completly removed TPI harness. Any connections to gauges/fuse power/etc splice from your existing connector block ON THE TABLE. BE careful, label stuff, etc. When you're done you'll have that factory tpi look, and you won't spend $3,000 finding a car as good as yours, but with TPI as oddly suggested above..
-- Joe
Senior Member
Joined: Sep 2000
Posts: 560
Likes: 1
From: Austin TX
Car: 91 RS Convertible
Engine: 355
Transmission: 700R4
Axle/Gears: 2.73 peg leg
One of my problems was I was swapping from TBI in a 91 to an 85 TPI system and nothing seemed to work right. The harness was labelled, but it had also been hacked up pretty good. There must've a short somewhere because it caught fire and screwed everything up. I realize this isn't typical of TPI swaps, but I got so frustrated after that fire that I ditched it and made money selling everything on ebay. It seemed like everytime I turned around, there was something else I needed to complete the swap. The junkyard didn't have crap, and I had to buy a lot of new parts at the dealership (this was before I knew about GMpartsdirect.com). I think that I probably could do the swap now in a weekend, if I had everything I needed, and I am definitely wiser about everything that I need, but that doesn't mean I was lazy then.
Joined: Jul 1999
Posts: 12,089
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Did you read the TBI to TPI swap conversion I wrote up ? step by step to repin the TBI harness to TPI.
-- Joe
-- Joe
Member
Joined: Nov 2003
Posts: 257
Likes: 0
From: Wellington, Kansas
Car: 92Z28
Engine: L98
Transmission: A4
Originally posted by anesthes
Thats a really lame way of thinking. Replace the car to change induction and ecm? What if he likes his car?
Thats a really lame way of thinking. Replace the car to change induction and ecm? What if he likes his car?
Originally posted by anesthes
In the end, my point is please. If someone asks for help or whatever in doing something, don't shoot it down. If you can't help them, or give them optimistic information don't bother at all.
-- Joe
In the end, my point is please. If someone asks for help or whatever in doing something, don't shoot it down. If you can't help them, or give them optimistic information don't bother at all.
-- Joe
Jamesmc03;
If you like the car I would consider it as I stated above if it's a labor of love, do it. If not you may be in for a lot of work/expense and Murphy likes swaps like this, so just don't think for $400 you will be running optimal on a car that has a motor and computer that aren't matched and expect the unexpected to pop up. I like my TPI car, and it would be a big improvement in your car, but it will be a big job and would cost you a bunch to have it done for you.
Good luck,
Charlie
Member
Joined: Sep 2002
Posts: 292
Likes: 0
From: Lehigh Valley, PA
Car: 1986 Pontiac Firebird S/E
Engine: LG4 TPI Conversion
Transmission: 700r4
Axle/Gears: 3.42 SLP Posi 10 Bolt
Question for Zephyr
Hey Zeph,
Do you have a p/n on that Holley fuel pump, and list of stuff and prices on what you used for a fuel pump setup?
I'm going to do the conversion too, and I found a severe lacking of a Tech Article to swap in TPI in place of a carb... I don't mind writing one, and I really like the clean install you have.
Do you have a p/n on that Holley fuel pump, and list of stuff and prices on what you used for a fuel pump setup?
I'm going to do the conversion too, and I found a severe lacking of a Tech Article to swap in TPI in place of a carb... I don't mind writing one, and I really like the clean install you have.
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