TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Ok so i have been reading up and looking into this swap for a while now just have one question. Are any of these vehicles modified prior to the computer swap? I am asking because selling the wife on a tuning program probably wont happen with all of the parts. I am wondering if a 'modified' TPI will be able to run the stock 01-02 van flash for a while before the tune funds are saved up. I dont have a daily driver but i would like to drive it a bit. Just wondering how much i have to be negotiating for with the wife.
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it cost me just over $1,300 including all new sensors and paying someone to weld in the 2nd O2 bung. i also needed another balancer. any other questions let me know
I drove my 383 Formula on the stock van tune. Ran flawless. It only made 238RWHP on the Van tune lol. Once tuned we were over 360+ at the wheels.
I'm going on 3 years with this swap. It is the best investment I have ever made. I would do this swap to a stock motor as well. Its "that" good. People say subframe connectors should be the first suspension mod, well this should be the first engine mod.
I drove my 383 Formula on the stock van tune. Ran flawless. It only made 238RWHP on the Van tune lol. Once tuned we were over 360+ at the wheels.
I'm going on 3 years with this swap. It is the best investment I have ever made. I would do this swap to a stock motor as well. Its "that" good. People say subframe connectors should be the first suspension mod, well this should be the first engine mod.
Did PCMforless in NC do the dyno?
How many runs did it take?
Thanks,
Ron
No, Jamy from the old LSRacing Chips down the street did it for me when Akron horsepower was still around . I think it took 4-5 runs only for both of my cars. Before the swap Him and I would spend a day at the dyno together all day working with the old MAF then SD system.. We looked at my runs from the last few years and I had 90+ dyno pulls lol. Not bad for a 40K mile 383 still living lol. I helped him out and the shop with customers cars so the dyno sessions and tune was always free. Made it nice.
Amazingly I just stumbled onto this thread looking for this very conversion. As for the mods to the harmonic balancer, do I understand that the earlier Vortec balancer can be used instead of modifying the later one? Many of us may be running a hi perf balancer and I doubt the early Vortec balancer is. How much material must be milled of the balancer snub? Thanks. -Bob
Amazingly I just stumbled onto this thread looking for this very conversion. As for the mods to the harmonic balancer, do I understand that the earlier Vortec balancer can be used instead of modifying the later one? Many of us may be running a hi perf balancer and I doubt the early Vortec balancer is. How much material must be milled of the balancer snub? Thanks. -Bob
Oops, never mind - I found it in the thread.
Yeah, the thickness of the reluctor ring you're putting in needs to come off balancer.
i seen on here about switching to an lt1 throttle body with the OBDII swap just wondering what the benefits would be i know my idle now surges up an down pretty bad.
Last edited by obeymybird; 10-09-2009 at 02:17 AM.
the rest of my sensors are on the way just put in my order to mike for my harness im real getting pumped about this swap its been on the back burner for a long time now anyone on here use hp tuners might neede a hand down the road.
I wish I would have went with hptuners. Last I knew (about a year ago) EFI still didnt support my L67, which they claimed "soon" when I ordered it. HP also supports the truck I bought earlier this year. UGH.
It seems that (based on phone calls and conversations) that HP Tuners is slightly more popular then EFILive. I've always used EFILive and LOVE IT. We also have Craig Moates' RoadRunner PCM, so that's just the icing on the cake.
EFILive, HP Tuners, LS1Edit, Tunercat OBDII...doesn't really matter much. Each will just about do what you need. Although LS1Edit is not as powerful as EFILive (for example), I know LS1Edit users who stay true to the product because it's what they know and have worked with it to get the job done.
I do like EFILive's licensing better than HP Tuners.
Mkos,
In your opinion, what was the biggest reason that you picked up 122 hp. over the Van tune? Was it V.E. and Timing or was the P.E. Delay the biggest holdback?
Jeff
Quote:
Originally Posted by Mkos1980
I drove my 383 Formula on the stock van tune. Ran flawless. It only made 238RWHP on the Van tune lol. Once tuned we were over 360+ at the wheels.
i seen on here about switching to an lt1 throttle body with the OBDII swap just wondering what the benefits would be i know my idle now surges up an down pretty bad.
Swapping to a LTx TB will yield no benefits, only more issues
The casting is the same as a TPI TB, some places are a bit different. It uses the newer style TPS and IAC sensors which will need new connectors. It lacks the front vacuum port on the bottom. The throttle cam is different, but functional (sort of). The coolant lines are aimed slightly different (swap that piece if you want)
Surging idle suggest big vacuum leak and TPI's are prone to them with so many gaskets and surfaces to install correctly. Check that first
I have spent the last few days reviewing this thread and wow! an idea that i thought would end up in the dump bin actually turned out to be what it was meant to be! I really do find it amazing how you guys brought the SBC "BACK TO THE FUTURE" ahahhahaha. anyways.
Right now, i got an 85 Z28 with the god awful almighty LG4. (canadian, no pcm) Im looking at doing a swap to a 350 or 383, something along those lines. With this system... Now, i have virtually nothing prepared, and im hoping to get this all done on a budget of around $5000... i basically want big power, with the same or better driveability i get from my LG4, with the same or better MPG (might not be possible, even if its not itll be worth it)
Based on what ive seen and the results ive read, its been figured out to work, and to be reliable. This will be the last engine upgrade (or only lmao) my car will see for probably years to come. My car is a daily driver, and always will be, which is what makes this swap so intresting.
My friend has a 350 SD tpi, and its cammed and tuned. but i guess his cam is too lumpy, becuase in open loop (the cold one), the car surges at idle really badly. and i dont want that, I want the stereotypical EFI setup. Turn key, put in gear, WOT, perfectly smooth or close to .
So my question to you guys is, I realize no one here has a stock tpi behind their system here. So what are you running, and more specifally. What cam? and what cam do you recommend?
well i have all my parts and wildside's harness will be here tomorrow the car is in the body shop right now though should have it back in a week. im really pumped up on doing this swap im so worried about the start up though we have hp tuners but its new to us.
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