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#1 |
Senior Member
![]() Join Date: May 2004
Location: Queen Creek, AZ
Posts: 1,005
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TPI system
I have a chance to get a TPI from an '86 IROC with a 305.. Is the TPI compatible with a Comp Cams 268 in a 350?? Should the chip be replaced?? Any other input??
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#2 |
Registered User
Join Date: Feb 2002
Location: Vacaville, CA
Posts: 2,746
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Re: TPI system
Which 268 cam they make at least 6? At the very least you would need a new chip at worst the vacuum will be too low for the MAF sensor to be able to set the idle.
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#3 |
Registered User
Join Date: Mar 2004
Location: Lexington, KY
Posts: 865
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Re: TPI system
You'll also need to upgrade the injectors to like a ...22lbs injector I believe.
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#4 |
Senior Member
![]() Join Date: May 2004
Location: Queen Creek, AZ
Posts: 1,005
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Re: TPI system
I know I would need to replace the injectors. I would have to look up the specs on the cam, but I know it has a .454 lift.
Last edited by 53burb; 01-31-2006 at 03:54 AM. |
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#5 |
Senior Member
![]() Join Date: May 2004
Location: Queen Creek, AZ
Posts: 1,005
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Re: TPI system
Didn't get it.
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#6 |
Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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Re: TPI system
Yeah, if it wasn't an EFI cam, you'd have had a lot of trouble getting it running.
I've got an XE262-H in my truck, and the TPI won't run with it. I'm pulling it out, and getting a smaller EFI version that makes power down low, instead of up higher like the 262
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
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#7 |
Senior Member
![]() Join Date: May 2004
Location: Queen Creek, AZ
Posts: 1,005
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Re: TPI system
I'm still looking for a TPI. I think you mentioned before not to use an '85 TPI. Is it possible to use a TPI, and still have a large cam?? I guess not. This would be on a '69 Burb. I was planning on using headers, 3.08 gears, 26" tires, and 400 tranny. Which cam do you recommend for this??
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#8 | |
Registered User
Join Date: Jan 2004
Location: NH
Posts: 2,266
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Re: TPI system
Quote:
Pros- with your setup, heavy vehicle, higway gears. The TPI is an excellant choice for this type of application because it has great lowend tourque capabilities. The biggest problem you will have with factory type setups is more to be with the ECM, the ecm in some cases are not reprogramable or you have to get chips for and sometime this can run up some dollar usage because you are relying on someones tuning ability and hope he gets it done on the first try, some will offer a reprograming resonable or free. With the factory ECM the biggest issue in selection of the cam is because of vacuum, if it sees a low vacuum signal it will keep trying to compensate and will set codes, casue real eradic running, dumps fuel to compensate, also tries to adjust timing as well to compensate. Even with aftermarket ECM's to control the fuel injection big lumpy cams are still a big chore to deal with, but you can still do it.
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1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them" |
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#9 |
Keep On Truckin'
Join Date: Mar 2003
Location: Buda, Texas
Posts: 1,354
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Re: TPI system
Go buy the TPI Fuel Swappers Guide. Cheap investment for anyone doing or thinking about swapping over to a TPI setup. It helped me a bunch doing my swap.
http://www.amazon.com/gp/product/188...Fencoding=UTF8
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Just Passin' Thru Some projects are like herding cats; others are like putting out fires; this one was like herding cats on fire..... |
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#10 |
Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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Re: TPI system
Actually, you can easily run a larger cam with the setup. Biggest thing is to make sure that it is designed for a fuel injection system, and has a higher numerical LSA to match. The problem you'd have with the 268 is valve overlap. The overlap allows 02 straight into the exhaust, which causes the 02 sensor to detect an extreme lean condition, and pour fuel into the engine to compensate. However, that just makes things really rich, and will make the engine run terrible. Once you get it into the higher RPMs, she'll be better, but will definitely still require a custom chip for your engine.
But, you have to keep in mind that a stock 350 with a stock TPI intake runs outta breath by 5000 rpm, at the very latest. You can get other TPI intakes such as a super ram, or have an LT1 intake converted to fit your 350, and then run a larger cam, but you just have to remember to keep the cam matched to what the heads / intake are capable of ![]()
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) Last edited by Russell; 02-03-2006 at 03:50 PM. |
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#11 |
Registered User
Join Date: Feb 2002
Location: Vacaville, CA
Posts: 2,746
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Re: TPI system
^ What Russell said. The best of both worlds is a TPI setup with a modified LT1 intake manifold (Look here: http://www.lt1intake.com/services.htm). It shouldn't be that hard to come by I am seeing more and more of them in the salvage yards. I would get your EFI setup first and then call around to the cam manufactures and see what they reccomend.
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#12 |
Senior Member
![]() Join Date: Sep 2004
Location: N.W. Arkansas
Posts: 456
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Re: TPI system
I've been looking for a TPI unit for my 383 for a while. It's low compression with a Crane 266 duration .440/.440 cam.
I plan on installing a 87 Corvette 700R4 and a F++d 9" posi/disc 3.0 rear. I think when I ordered the cam it was listed as "not computer compatable". Anyway, I'm totally inexperienced at this stuff and think for performance and economy, a TPI would be a good way to go. Any comments or suggestions welcome. Leads on TPI's? I just ordered the TPI Swappers Guide.
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69 GMC 3/4 ton LWB 383 TH400 Dana 60 '84 300ZX '79 Nova (for sale) |
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#13 |
Senior Member
![]() Join Date: May 2004
Location: Queen Creek, AZ
Posts: 1,005
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Re: TPI system
You can look on ebay, craigslist.com, or thirdgen.org. Those are the places I have been looking at.
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#14 | |
Registered User
Join Date: Jan 2004
Location: NH
Posts: 2,266
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Re: TPI system
Quote:
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1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them" Last edited by Bowtie67; 02-04-2006 at 06:50 PM. |
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#15 |
Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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Re: TPI system
One more thing to add here:
Do yourselves a favour, and don't buy a setup off ebay, or thirdgen. No matter how complete they state it is, you'll always be missing something, and it will always cost you a lot to replace those missing somethings. Your absolute best bet is to put some money down on a good running TPI 3rd gen with a 350, swap all the EFI parts over, then put a carb onto the third gen's engine, and re-sell it. The initial cost may be moderately high, but in the end, you'd pay far more for all the little bits and peices. Say you spend 3000 on a good running car, then re-sell it for 2500, you're only out 500, and you have absolutely everything you need for your truck. While I on the other hand, bought all the bits and peices, and I am nearly 1200 US into my swap ![]()
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
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#16 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: TPI system
I have had this setup now for over 16 years and couldn't ask for a better running truck. Man it's nice jump in it in the morning crank it up and go.
When I did my swap it was far and few on here and hardly any advice was know of. Street & Performance helped me in everything I needed. 86 camero 305 HO motor completely rebuilt to stock V-6 ferrio computer with S&P chip 700-R4 trans 4-10 rear gears 42 gallon fuel tank in back ![]() ![]()
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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. |
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