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01-28-2010, 08:44 PM | #1 |
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Join Date: Oct 2009
Location: warrenton , Oregon
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what do you thank of tpi
i want to put a tpi set up on my 72 gmc and wanted to know what everyone has to say
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my dads web site www.batauto.com 72 gmc fleetside long box 2wd for now going on 4x4 fram soon with tpi 350 91 s-10 blazer 4x4 with tbi 350 94 s-10 blazer all time 4x4 4.3 vortec 1960 3/4 factery 4x4 longbox |
01-28-2010, 08:58 PM | #2 |
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Join Date: Jul 2008
Location: Vancouver
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Re: what do you thank of tpi
I dont own one, but have been a gm tech for years, I recall them as a decent set up, limited in rpm and horsepower(240 hp) in oem form. A MUCH better set up is a lt-1 or a ls motor in my opinion...
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01-28-2010, 09:26 PM | #3 |
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Location: Sammamish, WA
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Re: what do you thank of tpi
Don't
If you want FI, you're far better off with one of the aftermarket systems than trying to retrofit a factory setup. FAST EZ-EFI Edelbrock Pro Tuner EFI Holley Avenger EFI ...and others. It seems like retrofitting factory EFI will be cheaper...but by the time you get the wiring harness and tuning squared away you'll be in for some coin. It CAN be done, for sure - but you gotta work for it. |
01-28-2010, 10:09 PM | #4 |
Its a Truck Thing......
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Re: what do you thank of tpi
I would also do it if it wasnt so expensive.....
Smitty
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71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 69 C30 Former Motor Home, Flat Bed time 70 G20 Red-E-Kamp Conversion "I'm your Boogy Van" |
01-28-2010, 10:36 PM | #5 |
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Re: what do you thank of tpi
Got $3500.00? That's about what it will take for a closed loop system. An open loop is cheaper but not much better than running a carb. If I still had the 350 in my 67 this is how I would go for the same money. The cool factor is way up there! Four DCOE 48 Webers!
Last edited by Fitz; 01-28-2010 at 10:38 PM. |
01-28-2010, 10:43 PM | #6 |
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Re: what do you thank of tpi
I love mine had it now since 1989 and haven't had any major problems with it.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
01-28-2010, 10:56 PM | #7 |
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Re: what do you thank of tpi
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01-28-2010, 11:39 PM | #8 |
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Location: warrenton , Oregon
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Re: what do you thank of tpi
ok cool the tpi is off a 89 305 h.o.p. and its all free all i have to do is pull it out and put it in and deal with the computer and stuff but it works. and i have a tbi set up i got off a 90 chevy i need the intake for it im just can figer out what to do
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my dads web site www.batauto.com 72 gmc fleetside long box 2wd for now going on 4x4 fram soon with tpi 350 91 s-10 blazer 4x4 with tbi 350 94 s-10 blazer all time 4x4 4.3 vortec 1960 3/4 factery 4x4 longbox |
01-28-2010, 11:48 PM | #9 |
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Re: what do you thank of tpi
It works with a stock, emissions 305. You're going to learn pretty quickly that the factory TPI computer has limited ability to be reprogrammed and burning EPROMS gets expen$ive. $575 right out of the gate just for programming...and programming that won't be quite right. Figure 2-3 tries to get it right with instrumented dyno runs at $250/hour. Trust me; I've been there.
Tuned Port Induction Specialties This is why an aftermarket system, although initially more expensive, will virtually always end up being cheaper in the end. If you feel like you gotta go this way, at least look at an aftermarket harness and computer. Painless Performance TPI harness. Still looking at more than $1500 by the time it's all hooked up. And you know you need to plumb an EFI-capable electric fuel pump with return, right? Last edited by Ticker; 01-28-2010 at 11:58 PM. |
01-29-2010, 01:44 AM | #10 | |
Fun Stuff
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Re: what do you thank of tpi
Quote:
Jay |
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01-28-2010, 10:48 PM | #11 |
blood type; Retumbo
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Re: what do you thank of tpi
I'm not sure the performance is much better than a Throttle Body setup. TBI is cheaper and sooooo simple/reliable.
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01-29-2010, 12:02 AM | #12 |
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Location: Sammamish, WA
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Re: what do you thank of tpi
Here's a good link if you're moving forward with this:
http://tpisuburban.edgesz28.com/suburban-home.htm |
01-29-2010, 12:40 AM | #13 |
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Location: texas
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Re: what do you thank of tpi
DO IT.....ESPECIALLY IF YOU HAVE EVERYTHING....they are right....its not a huge monster for power but its a million times more reliable than a carb or tbi.....do it i support you...i use to drive one everyday and was completely satisfied now i put one in my 68 and its sweet
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01-29-2010, 01:04 AM | #14 | |
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Re: what do you thank of tpi
Quote:
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01-29-2010, 01:46 AM | #15 |
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Join Date: Oct 2009
Location: warrenton , Oregon
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Re: what do you thank of tpi
i have a s-10 blazer 4x4 with a 350 thats tbi and i have problems with it my bigst problem is that it just dosnt have power i cant get it to slip a tire so the tpi is looking realy good i dont have much money. i have a 3 month old baby so im just trying to get it figerd out and then done and i dont get it i dont know i had to mess with the computer i thout if i pulled it and just droped it in. it would work im not much of a computer guy if it got a carb on it i can work on it so it a big new step for me
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my dads web site www.batauto.com 72 gmc fleetside long box 2wd for now going on 4x4 fram soon with tpi 350 91 s-10 blazer 4x4 with tbi 350 94 s-10 blazer all time 4x4 4.3 vortec 1960 3/4 factery 4x4 longbox |
01-29-2010, 07:52 AM | #16 |
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Join Date: Feb 2008
Location: Shelbyville, KY
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Re: what do you thank of tpi
From what I've picked up on the F Body forums, the TPI itself does not make a big power difference over TBI, and is more limited as the runners are tuned for a set RPM use. All 305 TPIs are HO. Otherwise you have a tbi. In addition to smaller fuel injectors ( witch can be fixed by upping fuel pressure) the knock sensor is not the same as 350.
TPI is a great set up for a stock motor although TBI will give better torque. This is why trucks always got TBI. You really need to read up on everything involved before you make a decision. The third generation f-body forum is a good place to start, because that is where the motor in question was orginally installed......... |
01-30-2010, 03:17 AM | #17 | |
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Re: what do you thank of tpi
Quote:
Last edited by jayman68; 01-30-2010 at 12:24 PM. Reason: clarification |
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01-30-2010, 01:27 AM | #18 |
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Location: Eliot, Maine
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Re: what do you thank of tpi
tpi is better for high end horsepower, but tbi is the best all around and gives the advantages of fuel injection with nearly the simplicity of a carb. the only way to get truly better power is with direct injection.
the best bang for a small block is to hog out a tbi intake to mate with the larger throttle body off a big block truck. right now i plan to replace the rochester 2 barrel on my 72 burb with a q-jet. i will get better mpg and throttle response AND wake up that little 307. when i get my 406sb in it will really make a difference. but a hybrid tbi setup like i mentioned previously would be marginally better and have automatic adjustability for changes in altitude, etc. i do like how the factory tbi system looks like an old school carb setup when the air box is on top. there is a kit out there ($$$) that looks just like the tbi setup but with multiple injectors and a fuel rail down each side on the intake.....the looks of the carb, the throttle response of the tbi and the extra precision from having multi port injection. the 80's corvette style fuel injection does look awesome though, especially when chromed out. |
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