TPI Vortec 350
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
TPI Vortec 350
Just wanted to post a few pictures of the little project I have nearing completion. Its a 4-bolt main Vortec 350 block, with same mild Reed Custom grind roller cam with 1.6:1 full roller rockers that were in my 305, Ported 906 vortecs, Edelbrock 3817 Intake, Stock runners, a Ported plenum, stock throttle body, and Doug Thorley Tri-Y headers. I will be running it on the 7730 for now, but have plans to switch to an 0411 and OBDII setup as soon as I make sure the engine is running properly. Its just simpler to get it running and cause as few potential problems as possible.
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Car: 1991 Z28 - 2000 Z28
Engine: L98 - LS4
Transmission: 700R4 - 4L60E
Axle/Gears: 3.23's - 3.73's
Re: TPI Vortec 350
Hey, that base manifold looks familiar. Glad someone is putting it to good use.
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Car: 89 jaguar xjs convertable
Engine: 89 L98 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.23 dana 44
Re: TPI Vortec 350
Question? With all of that work. Why run a stock runner on it? Just curious.
#4
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TPI Vortec 350
Because my cam is designed to run from Idle-5,000 rpm and the stock runners won't restrict the engine with that RPM range. The transmission is also calibrated to upshift about 5,000 rpm @ WOT and I have a fairly tight 2,600 rpm stall torque converter and 3.08 gears.
I got it running last night and drove it this afternoon. Even with minimal tuning changes, the thing easily lights the tires up and pulls STRONG all the way from off-idle to the 5,000 rpm upshifts in the 700r4.
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TPI Vortec 350
It is a Vortec block, but GM machined it and built it originally to HD TBI replacement specs. I ran it with several different cams and heads before getting greedy for power, leaning out, and destroying a couple of pistons. It now has a set of forged flattop pistons, a balanced rotating assembly, total seal rings, and a milder cam with ported vortecs on top.
The 0411 is an OBDII ecm and runs full sequential. I am running the L31 timing cover, crank reluctor, and crankshaft position sensor. It will be running a L31 vortec distributor as well. The 0411 is also programmed to run off of an 85mm MAF and is compatible with the TPI sensors. I won't be running alot of the OBDII sensing, but some I will be. I am looking for a decent, cheap, used 4L60E to beef up and swap into the van as well. I programmed the PCM for Normal/High performance mode shift points.
The 0411 is an OBDII ecm and runs full sequential. I am running the L31 timing cover, crank reluctor, and crankshaft position sensor. It will be running a L31 vortec distributor as well. The 0411 is also programmed to run off of an 85mm MAF and is compatible with the TPI sensors. I won't be running alot of the OBDII sensing, but some I will be. I am looking for a decent, cheap, used 4L60E to beef up and swap into the van as well. I programmed the PCM for Normal/High performance mode shift points.
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#8
Re: TPI Vortec 350
Fun ain't it! Cool seeing your motor come together, I'm sure you catch many a person off guard with it out of the hole.
#9
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TPI Vortec 350
The only issue I have run across is with the OBDI ECM, I am having trouble with the idle. It wants to roll up and down. I checked the timing, IAC, Minimum air, searched for vacuum leaks, made a nice platue on the timing/fuel @ idle, but the surging persists. Hopefully I will get it licked tommorrow. So far I have gotten the thing to pull like a BEAST through the gears.
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TPI Vortec 350
The only run I have been able to safely make while datalogging with any success was a 10-80 mph run from a 2nd gear WOT roll-on. I even left it in drive and the transmission short shifts into 3rd @ 4,400 rpm. Still moves out nicely though. Its ALOT quicker brake stalling it to 1,200 launching it hard, letting the trans shift 1-2 @ 5,200 and shifting the trans into 3rd at about 5,300-5,500 rpm.
Are you saying I need to make a road trip and bring my prom tuning knowledge in exhange for said 4L60E core?
Are you saying I need to make a road trip and bring my prom tuning knowledge in exhange for said 4L60E core?
#12
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TPI Vortec 350
The ML550 is a nearly 5,000 lbs SUV with a 382 HP 5.5L V8 and 7 speed automatic trans. 0-60 in under 7 sec.
Last edited by Fast355; 10-21-2008 at 03:09 PM.
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Car: '87 S10 Blazer & '91 RS
Engine: L98 & L03
Transmission: 700R4 & T5
Axle/Gears: 10 Bolt/3.73/3.42
Re: TPI Vortec 350
Fast, How effective is the '427 at controlling MPFI? I baught one for my 92 RS, but that car is long gone, and the PCM may never get used. I'm growing partical to a 4L60E over the 700-R4. Are there any advantages using the '427 over a '730/AUJP bin? -Jim
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TPI Vortec 350
I ran my TPI 305 in my van on a modified 427, several others run them, and another member has even run his boat on it.
http://s105.photobucket.com/albums/m...05BoatMPFI.flv
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TPI Vortec 350
It still needs some desperate help on the WOT upshifts in the 700r4, but here is what it runs like. 1-2 upshift is bouncing off the 6K rev limit and the 2-3 upshift is only @ 5K. 1-2 should be happening about 5,700 and 2-3 about 5.5K. I don't think I will ever get that right without the 700r4 going away for a 4L60E.
#17
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TPI Vortec 350
I did ALOT of tweaking to the .BIN that is running it and I have it running GREAT now. It was mediocre before compared to now. WOT power hasn't changed so much, its refinement at part-throttle and idle that makes a world of difference out on the road.
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Car: 67 Firebird Convertible
Engine: LB9
Transmission: 700R4
Axle/Gears: 3.55
Re: TPI Vortec 350
Fast, what are you using to scan and do graphs?
Thanks,
Ron
Thanks,
Ron
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