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quad-to-tbi conversion?
- Thread starter jsrail
- Start date
juanblzer
1/2 ton status
It's not that hard to do... if you have the right help (thanks forever Mark).
The Tbi intake needs to be altered a bit to fit the older angle on the heads. That is a major PITA even with a dremel (I actually bought one for this purpose, after I killed Marks). Make sure you get all wiring available from the donor to make your life easier. You might have a little trouble dialing it in but then angles here you come. /forums/images/graemlins/grin.gif
The Tbi intake needs to be altered a bit to fit the older angle on the heads. That is a major PITA even with a dremel (I actually bought one for this purpose, after I killed Marks). Make sure you get all wiring available from the donor to make your life easier. You might have a little trouble dialing it in but then angles here you come. /forums/images/graemlins/grin.gif
Thanks for the tip. Do you think its worth the hassle? I just hear many horror stories about the aftermarket set-ups. I only have about 30K on the crate and hate to waste it by buying another used motor, etc. Could a machine shop grind the intake? How much grinding is involved?
Jay
85 Jimmy
Jay
85 Jimmy
Juan is right. Pretty easy especially if you have a donor vehicle. The manifold drilling is not that big of a deal. We have done a couple that way with good results. As long as your crate motor has a fairly stock cam , you will be pleased with the TBI.
Juan,
So how is it running now. Any smoking guns?
So how is it running now. Any smoking guns?
juan and azblazor:
Thanks to both you guys for the info. I think I'll start looking for the parts soon (need some tires and wheels first). Would you guys care if I emailed you after I've collected these parts....I'm sure I could use the help.
Jay
Thanks to both you guys for the info. I think I'll start looking for the parts soon (need some tires and wheels first). Would you guys care if I emailed you after I've collected these parts....I'm sure I could use the help.
Jay
Hossbaby50
3/4 ton status
I converted my truck to TPI awhile back. As said above the 4 holes at the center of the manifold need to be opened up. I used an air grinder with a drill bit in it to open my holes in the manifold. It was a bi*ch for sure. It took alot of time and alot of compressed air. I personally would look into having a machine shop open the holes to save the hassle.
FI is DEFINITLY worth the time. You get more MPG, more torque, more HP's, more throttle response, and the ability to run at any angle. FI is a huge advantage in the rocks. You don't have to worry about the carb loading up or stalling at high angle which is a definite plus.
Harley
FI is DEFINITLY worth the time. You get more MPG, more torque, more HP's, more throttle response, and the ability to run at any angle. FI is a huge advantage in the rocks. You don't have to worry about the carb loading up or stalling at high angle which is a definite plus.
Harley
84_Chevy_K10
Banned
If you guys saw the video of me from the most recent badlands run you'd really appreciate your EFI. I was doing awesome all day long, but when I was fighting the carb to run I was having a really rough time.
Hossbaby50
3/4 ton status
Yep, I have seen carbs in action on the trail. They do ok to a point. Alot of problems with carbs is the tuning but they are still only good to a certain point. A poorly tuned carb is a nightmare on the trail, and depending on what you wheel a properly tuned carb can still be a nightmare. That is why EFI is so worth it.
I ran my Qjet for many years but in nothing to extreme. It did pretty well for most things but I did get it to start cutting out on a steep loose hill climb which was kind of unnerving since very bad things could have happened if it stalled. It made it up the hill by feathering the pedal so the accelerator pumps kept it running but it was not fun.
Harley
I ran my Qjet for many years but in nothing to extreme. It did pretty well for most things but I did get it to start cutting out on a steep loose hill climb which was kind of unnerving since very bad things could have happened if it stalled. It made it up the hill by feathering the pedal so the accelerator pumps kept it running but it was not fun.
Harley
Sorry to be stupid, but what drilling are you guys talking about? I'm about ready to start the install of a TBI on my Q-jet K5 and am unaware of any grinding/drilling, etc.
84_Chevy_K10
Banned
If you want to install the factory TBI intake you're going to have to make it fit. I'm just going to use an adapter instead.
Hossbaby50
3/4 ton status
The center 2 bolt holes on each side of the manifold don't line up between FI heads and Carb heads so you must open them up to get them to fit.
Hossbaby50
3/4 ton status
TBI vs TPI
TBI:
cheaper install
easier install
originally on K5s
not much room for more power over a stock/mild motor
TPI:
More power & mileage then TBI
Little harder install
More money for install
Option to add more power to the system
TBI & TPI are about the same to price purchase a system, but TPI will cost more in the end. You get more power though and a little better mileage with TPI. TPI looks cooler too /forums/images/graemlins/thumb.gif
Both are good options but make an informed choice so you don't kick yourself in the end. I personally lean toward TPI because that is what I swapped to and I love it. Worth every penny. It was a night and day differnce from a carb.
http://coloradok5.com/forums/showflat.php/Cat/0/Number/1092752/page/0/view/collapsed/sb/5/o/all/fpart/1
Harley
You can see a pic of my motor in my webshots below.
TBI:
cheaper install
easier install
originally on K5s
not much room for more power over a stock/mild motor
TPI:
More power & mileage then TBI
Little harder install
More money for install
Option to add more power to the system
TBI & TPI are about the same to price purchase a system, but TPI will cost more in the end. You get more power though and a little better mileage with TPI. TPI looks cooler too /forums/images/graemlins/thumb.gif
Both are good options but make an informed choice so you don't kick yourself in the end. I personally lean toward TPI because that is what I swapped to and I love it. Worth every penny. It was a night and day differnce from a carb.
http://coloradok5.com/forums/showflat.php/Cat/0/Number/1092752/page/0/view/collapsed/sb/5/o/all/fpart/1
Harley
You can see a pic of my motor in my webshots below.
[ QUOTE ]
The center 2 bolt holes on each side of the manifold don't line up between FI heads and Carb heads so you must open them up to get them to fit.
[/ QUOTE ]
Oh. /forums/images/graemlins/thinking.gif I'm keeping my intake and everything and using an adapter to get the TBI on. I didn't realize the adapter was doing much except making up for the spread-bore. I'll know more when the kit shows up in the mail, hopefully this week.
The center 2 bolt holes on each side of the manifold don't line up between FI heads and Carb heads so you must open them up to get them to fit.
[/ QUOTE ]
Oh. /forums/images/graemlins/thinking.gif I'm keeping my intake and everything and using an adapter to get the TBI on. I didn't realize the adapter was doing much except making up for the spread-bore. I'll know more when the kit shows up in the mail, hopefully this week.
Hossbaby50
3/4 ton status
I bought my system off a local CK5'er. He ran it for awhile then decided that he wanted a new chanllenge an installed a Vortech motor and 4L60E tranny in his Jimmy. So he sold me his old TPI system.
When you get a FI system make sure you get everything available from the donor vehicle if at all possible. Wiring, ECM, manifold, distributor, all sensors, all relays, throttle body, air intake setup, etc.
Once you get closer to making up your mind on what you want and a purchase start searching for info. There is alot to learn about installing FI and you don't want to learn as you go. I tried, and it sucked. I can fill you in as much as possible to if you need me too.
Harley
When you get a FI system make sure you get everything available from the donor vehicle if at all possible. Wiring, ECM, manifold, distributor, all sensors, all relays, throttle body, air intake setup, etc.
Once you get closer to making up your mind on what you want and a purchase start searching for info. There is alot to learn about installing FI and you don't want to learn as you go. I tried, and it sucked. I can fill you in as much as possible to if you need me too.
Harley
Hossbaby50
3/4 ton status
No
TBI was the same (I think) from about 87-95
TPI was 85-92. There are 2 forms of TPI though, and several variations in the early years. The ones you want are 87-89 TPI or 90-92.
87-89 was MAF (uses mass airflow sensor)
90-92 was MAP (uses manifold absolute pressure sensor)
Both have there pro's and con's. I run MAF and I know people who run MAP. Both work well. The link above is a MAP setup. MAF is a little easier to swap since you don't have to have custom chips burned. If you do a search there is alot of info on TPI on this site and alot more on www.thirdgen.org
Harley
TBI was the same (I think) from about 87-95
TPI was 85-92. There are 2 forms of TPI though, and several variations in the early years. The ones you want are 87-89 TPI or 90-92.
87-89 was MAF (uses mass airflow sensor)
90-92 was MAP (uses manifold absolute pressure sensor)
Both have there pro's and con's. I run MAF and I know people who run MAP. Both work well. The link above is a MAP setup. MAF is a little easier to swap since you don't have to have custom chips burned. If you do a search there is alot of info on TPI on this site and alot more on www.thirdgen.org
Harley
