questions for converting to TPI
Last summer I picked up a TPI set up off an 88 Z28 Camaro. My intention is to use it in my 69 GMC with my sb 350 and the T5 transmission already in use. Im new to the TPI and Fuel injection world so naturally I have many unanswered questions.
So basically I think I have everything to do the swap except for the PCM which was gone before I found the car. http://img241.imageshack.us/img241/6715/p1080352lb0.jpg http://img241.imageshack.us/img241/3996/p1080347qg2.jpg The set up is off a 305 so Im guessing I need to find a 350 pcm. to make it work with my 350. I pulled the whole under hood wire harness out of the engine bay all the way back to where the pcm was, I cut nothing. Im hoping that this is all im going to need as far as wiring is concerned but I have no idea what wires I need to keep and which ones to discard. Im also aware that I must use a high pressure fuel pump and return line. what pump and tank to use is a huge question in my mind for I want to install the tank behind the rearend. I have a plastic foam filled 10 gal tank I would like to use but Im not sure if I can get a high pressure pump to use with it? Im also thinking I will probably have to machine my heads to accommodate the fuel injector notch. correct me if Im wrong. Ive also read a little something about different manifolds using different angle blot holes or missing a couple entirely. What should I expect to find when bolting the manifold onto early heads? So as you can see I have quite a bit of work and questions ahead of me but Im guessing this is the best place to ask for help. any help is always greatly appreciated :) |
Re: questions for converting to TPI
if you seach Tune port injection conversion or just Tuned port injection, it'll lead you to a thread that I started a few months back that will have all the info you should need. Also check out www.chevythunder.com. Lots of useful information on there.
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Re: questions for converting to TPI
Great I'll check that out too.
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does it look like everything I need is here besides the pcm?
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I'm at work, and will more detailed when I go home, but you will also need injectors, they are bigger for the 350, you can use the 305 PCM, it just has to be reflashed/reprogrammed. I will try to answer the rest of your questions after I get home.
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Please do the search and look for my old thread, everyone that I've spoken with about the harness swears that painless is horrible and they give other manufacturers that are supposed to be better. And he is correct about the injectors
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I ran a painless harness and it was plug and play. I really liked mine
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Re: questions for converting to TPI
I bought this book. A lot of good info...
http://cgi.ebay.com/ebaymotors/TPI-H...Q5fAccessories LockDoc |
Re: questions for converting to TPI
buying that book. :) thanks!
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I just got done reading your thread. very good info. Cant wait to start researching some of those sites on there too. Im going to try and gather as much as I can as well as try and clarify some things on here.
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Re: questions for converting to TPI
Sorry should have mentioned my engine combo. My 350 has a mild cam and flat top pistons.020 over. My heads are mid 70's big valve smogers (not the best I know). the engine is about 9.5 to 10 -1 compression. Im Using a Moroso windage tray, Im running the stock 11inch flywheel.
it has long headers and 2.5 inch exhaust. Rear end is soon to be a 4.56 ratio. right now its a 3.90. rear tires are 295 50 15's Im going to be changing the cam to work with better with my combination. I have no idea what the specs are on it cause I lost the damn cam card, but I know its very mild, about 17hg's at 600 rpm With my combo will I need more than 22lb injectors? Quote:
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I am curious, everyone that I've spoken with says you can't run an aggressive cam at all with a TPI. Have you heard something different? And if so please enlighten me.
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mmm...you should tell me more...I'm already running the vortec 350. Can you get me all of his engine specs? And tune port specs as well?
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Ok so ive been hearing more and more about the use of vortec heads on older short blocks. Isnt there quite a bit of modifying that needs to be done to run these heads? Forgive me but Im uneducated about the years in which the heads changed can someone clarify this. Im also reading up on things and finding that some people are using LS1 intake system on the older styles. how similar are the blocks and heads form generation to generation. Maybe there is a informative web site someone cant point me too that explains this.
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Re: questions for converting to TPI
Im guessing its because of the restrictive RPM curve people have been mentioning. Bigger cam = higher rpm power range.
I do have a book Ive been reading into a bit called Tpi swapers guide it has some info in it about installing bigger throttle bodys and bigger intake runners to get that higher Rpm Operating range, but Ive only glanced through that section. Quote:
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Torque: 380 ft/lbs @ 3500 rpm Compression Ratio: 9.1 to 1 Block: Cast Iron 4-bolt, 4.000" Bore Crankshaft: Cast Nodular, 3.480" Stroke Heads, Chamber Size: Vortec Cast Iron, 64cc Chamber Valves (I/E): 1.940"/1.500" Camshaft, Lift (I/E): 0.435"/0.460" Hydraulic Camshaft Duration @ 0.050" I/E: 212/222 degrees Intake Manifold: Aluminum Dual Plane (Deluxe and Turn-key models only) |
Re: questions for converting to TPI
Hope that helps
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Re: questions for converting to TPI
he didn't use a roller block...see everytime I talk to someone about putting an after market cam in my truck it's above 485 lift. But otherwise I do believe I smell what you are stepping in. Did he have it dyno tuned as well? Or just a generic chip burned for it?
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Re: questions for converting to TPI
one of my main concerns is the gas tank and fuel pump issue. I hear that baffles in the tank are necessary. what types of tanks work best for this conversion?
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awesome! then I can just use my aftermarket foam filled tank then :)
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Re: questions for converting to TPI
You will need over a 100 PSI inline pump. They are pretty pricey.
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Re: questions for converting to TPI
I am almost positive that 90 PSI is what the TPI runs at.
I bought a tank with an inline pump from boardmember fuelcellguy. I had a TPI from a 305 and had the chip reprogrammed by Brian at tpichips.com. I told him what I had for a motor, and what I was elminating from my TPI (such as smog), and he reprogrammed the chip accordingly. I bought my ducting for the intake from jagsthatrun.com. I reused the stock harness. I bought the factory Helm manual and it was a HUGE help. I elimated what I didn't need from the factory harness. I highly recommend using the factory harness, going through it to eleminate what I didn't need taught me a TON about how the system worked. It really did help with my swap. I forgot to add, but you probably already know this. You will need to modify the middle four bolts on your intake to work with your older style heads. It's not a major mod, just something to keep in mind. |
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LockDoc |
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I did a little research and found that the TPI runs at 35-47 PSI. The stock system will actually start at 35 PSI and then have one bump-up to 45 PSI. Thought I should correct what I wrote earlier since it wasn't correct. |
Re: questions for converting to TPI
Great! this is such a huge help. :)
on the 4 center bolt holes what exactly do I need to do to them to make it work with the early heads? do I just take a file or drill to them to them and ream them out to the proper angle or do I need to drill new ones. If I have to drill new holes is there a need to weld up the old ones? I already have a 87 + manifold so I'll just use that. I guess Im missing the mass airflow sensor on here. What are my options? do I have to run one? Also on a different note my friend had a set of 86 + heads off a 350. Do these heads have the correct bolt angle and should I use these heads over my mid 70's heads? |
Re: questions for converting to TPI
will it hurt anything to run more pressure than I need? whats the deal on this?
I can easily get a hold of a z fuel pump. Quote:
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also where the hell do I place the O2 sensor If Im running long tube headers? I think I read something that said no more than 15 inches away from the head.
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would this up grade help increase mpg
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yes! 18 - 20 mpg's from what Ive read.
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Tpi factory settings are about 40 to 45 PSI. Anything more and it makes the injector over spray.
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On the fuel pressure - the fuel pressure regulator will handle the pressure, so the pump should crank out more PSI, and the regulator will back it down by sending fuel back to the tank. I have read that if your pump is too powerful, the fuel return line can't handle the extra fuel and you end up with problems.
On the O2 sensor. You should find in reading that if you use long tube headers you will want to use a heated O2 sensor. I don't know the exact distance, but I do remember reading that a heated O2 sensor will help when the O2 sensor is behind long tube headers. On the gas mileage. I found my mileage improved a little bit, but certainly not enough to pay for the conversion. The other problem was the low end torque made it more fun to get into the pedal. |
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The only problem with it is when you do it in front of johney law :) or when you break something in the process.
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so far Ive read quite a bit from the chevythunder.com website. I think I have most of it figured out now but still some questions remain. the biggest of which is the gas tank situation. I want to use a in tank pump and I want to use a tank that fits between the rearend and the bumper. what tank am I going to need.
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