So I have a TPI system and a running 89 350.
Worth it to do this and what advice would you have on improvements.
Worth it to do this and what advice would you have on improvements.
CK5
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Tbi 350 to TPI ?
- Thread starter imiceman44
- Start date
Great truck engine.
Martin
Martin
That's engine number 3 for another vehicle.
I want the roller engine in the overland vehicle.
Are you saying to put the TPI instead of the vortec system?
I have it
No.
I have an L31 complete that need a rebuild.
I have a TPI system only.
And I have a tbi 350 that runs but could use some attention.
So I trying to figure out what to use to get 2 running engines each for a different vehicle.
I never care for high horsepower, just high torque as low as possible in the rpm range. That's it pretty much.
The L98 is the engine they should have put in the trucks.
Dyno charts of unmolested L98s and L31s are hard to find, but the L98s appear to better the L31 on torque production on low end. Kind of to be expected with long, small runners.
Tuning TBI and TPI is basically the same animal. Antiquated, kind of painful. But the tool for one will do the other. Probably a lot easier to learn (and install is better) if both are MAP, and not MAF TPI and TBI (Which is MAP). Pretty easy conversion to MAP with TPI IIRC.
Dyno charts of unmolested L98s and L31s are hard to find, but the L98s appear to better the L31 on torque production on low end. Kind of to be expected with long, small runners.
Tuning TBI and TPI is basically the same animal. Antiquated, kind of painful. But the tool for one will do the other. Probably a lot easier to learn (and install is better) if both are MAP, and not MAF TPI and TBI (Which is MAP). Pretty easy conversion to MAP with TPI IIRC.
Big thing: knock sensors are apples and oranges. Ensure you have one for TPI.
And, if I IIRC, the TPI does NOT use the ESC module like the TBI. (Electronic Spark Control)
I have a tpi unit I bought in 94 for the 87 r10 I had then.
Still have it, with a new in the box BBK 1000 cfm throttle body I bought then.
And some overly worked SLP runners...
Lol
My garage is full of expensive junk!
And, if I IIRC, the TPI does NOT use the ESC module like the TBI. (Electronic Spark Control)
I have a tpi unit I bought in 94 for the 87 r10 I had then.
Still have it, with a new in the box BBK 1000 cfm throttle body I bought then.
And some overly worked SLP runners...
Lol
My garage is full of expensive junk!
Some reading material...
www.hotrodders.com
L-31 Vortec to TPI?
is it possible to change the spyder injector style manifold of a L-31 5.7L Vortec V-8 to TPI without major hassle. i recently picked one up at the scrap yard and was wondering what it would take to swap out injection styles if at all possible. Also i will probably be making the 350 into a 383 w/...
Just as I thought, too expensive to do on a vortec.Some reading material...
L-31 Vortec to TPI?
is it possible to change the spyder injector style manifold of a L-31 5.7L Vortec V-8 to TPI without major hassle. i recently picked one up at the scrap yard and was wondering what it would take to swap out injection styles if at all possible. Also i will probably be making the 350 into a 383 w/...
My plan is to use it on my 89 tbi engine.
I think it's the best improvement on that engine after I freshen it up
So those parts you speak of, are they not in the plans anymore and you want to sell them or you're just saying you have similar plans?
Still on my someday list....
I'll give you first crack if I wind up selling them.
I'll give you first crack if I wind up selling them.
TPI had some component changes from '85-92. Mine uses a separate ESC module. I want to say maybe the change in '90 to MAP eliminated that. You don't want the early MAF setups that had some sort of separate MAF controller. Realistically I don't see a reason to go with anything other than MAP.
I might pick your brain once I get ready to do it.
I know my setup is the late 80s but the harness is a mess and I'm not sure if I have the ecm.
So I will need some parts I had read about the different setups and I was not sure what worked best for my system
No problem. At some point I plan to convert to MAP, but until the MAF dies I don't have a lot of motivation to do so. But the MAP setups are more refined. I think the ECM for those (original number, not the reman number) ends in '730. The MAF ECM ends in '165. It's common to see a GM replacement number though, because every time a vehicle with an ECM doesnt run right, it's the ECM. 
Well on the last 3 vortec vehicles I got not running the ecm was the problem but it was a different kind of problem.No problem. At some point I plan to convert to MAP, but until the MAF dies I don't have a lot of motivation to do so. But the MAP setups are more refined. I think the ECM for those (original number, not the reman number) ends in '730. The MAF ECM ends in '165. It's common to see a GM replacement number though, because every time a vehicle with an ECM doesnt run right, it's the ECM.
those aluminum housings tend to oxidize really bad in salty environments and the white fuzz travels to the circuit board and causes problems
I'm guessing maybe that has to do with electricity? The master cylinder in that photo isn't nearly as bad!
