TPI Systems

[oldvet]

The TPI systems on the 89/L98 engine. will these systems fit any 350 blocks/heads. I,am thinking of swapping my l98 for a 350 thats already built. Does all 350/383 stroker have places for the antiknock sensore and such things.? What must I check before buying? I would like to keep my wiring, computer etc, without having to do any modifications.

 

[vetteboy86]

Pretty sure all the TPI systems from 85 to 89 are the same. In 90 or 91 they went to a speed density system instead of using the Mass Airflow sensor. I think the wiring is probably different, and the computer is different for sure.

 

[oldvet]

Pretty sure all the TPI systems from 85 to 89 are the same. In 90 or 91 they went to a speed density system instead of using the Mass Airflow sensor. I think the wiring is probably different, and the computer is different for sure.

.
I,am asking if the TPI on my engine will fit any 350 block. I just want to swap my block out and keep my TPI.

 

[WhalePirot]

bye bye TBI; Hello TPI

I put one on my 406; an early 70's block. It has all the sensors and is setup to look like an '87 with a '90 (speed density) ECM, if that helps some.

You may have some programming issues it the cam, heads and such are much different from the stocker.

 

[Edmond]

.
I,am asking if the TPI on my engine will fit any 350 block. I just want to swap my block out and keep my TPI.

The TPI will fit any Gen I 350. It will not fit onto anything like the LT or LS motors. Well, it might fit on there physically but it wouldn't work.

 

[oldvet]

I put one on my 406; an early 70's block. It has all the sensors and is setup to look like an '87 with a '90 (speed density) ECM, if that helps some.

You may have some programming issues it the cam, heads and such are much different from the stocker.

Thanks for the info. The reason I,am asking is because there are plenty of beefed up short blocks on ebay with plenty more horsepower, and sinse my block seems to be burning oil, I was thinking of going that way. But I would like to keep my TPI system, only because I like the looks. I would probaly defeat my purpose, so maybe I should go with Carb system. Decisions, decisions,, etc.

 

[oldvet]

The TPI will fit any Gen I 350. It will not fit onto anything like the LT or LS motors. Well, it might fit on there physically but it wouldn't work.

Thanks for your reply.

 

[SPANISHVETTS]

I put one on my 406; an early 70's block. It has all the sensors and is setup to look like an '87 with a '90 (speed density) ECM, if that helps some.

You may have some programming issues it the cam, heads and such are much different from the stocker.

What won't fit can be made to fit. As Whale indicates the programming can be fun but with a bit of trial and error you can work it out.

 

[Mad-Mic]

your tuning won't be so bad. your stock tune will be adequate as long as you don't go with to nasty of a cam. 383 ZZ409 cam is about as big as you want to go. Don't forget to add 24 lbs injectors and change your fuel filter and add an adustable fuel pressure regulator and read your plugs. Then you will be fine till you can find someone to burn you a chip.

FYI my friend has an 85 C4 with 383/SR/ZZ409 cam/195 AFR's/3500 stall on stock D36 w/3.07 gears on ET Streets and skinnies up front running 11.7's at 118+ mph. All this on a stock chip.

all the chip does is lets you adjust the parameters of spark/fuel curve/ overall advanced timing curve/fans and a few other minor things. it also adjusts your Air Fuel Ratio. If the parameters are set like they are now at a stock setting then the AF will only have so far to go from one side to another and if it can't compensate as far as it needs too then it removes the parameter caps and goes to a ALL Rich setup just like if your MAF or O2 sensor went bad. This is where Old School tuning comes in with your adjustable fuel pressure regulator and reading the plugs. Same thing with Timing. It only adjusts for overall advanced timing. base timing is set by YOU. more advance in your base timing the better as long as you don't get knock.

Once you get all that dialed in you get with a reputable chip burner and give him your info of your motor and get a dyno run in with AF and send him all the info. with a well burnt chip on a STOCK motor you *Could* pick up 20-30 rwhp. on a modified or modified stroker you *Could* see upto 30+ rwhp.

 

[oldvet]

Thanks for your response.

 

[oldvet]

your tuning won't be so bad. your stock tune will be adequate as long as you don't go with to nasty of a cam. 383 ZZ409 cam is about as big as you want to go. Don't forget to add 24 lbs injectors and change your fuel filter and add an adustable fuel pressure regulator and read your plugs. Then you will be fine till you can find someone to burn you a chip.

FYI my friend has an 85 C4 with 383/SR/ZZ409 cam/195 AFR's/3500 stall on stock D36 w/3.07 gears on ET Streets and skinnies up front running 11.7's at 118+ mph. All this on a stock chip.

all the chip does is lets you adjust the parameters of spark/fuel curve/ overall advanced timing curve/fans and a few other minor things. it also adjusts your Air Fuel Ratio. If the parameters are set like they are now at a stock setting then the AF will only have so far to go from one side to another and if it can't compensate as far as it needs too then it removes the parameter caps and goes to a ALL Rich setup just like if your MAF or O2 sensor went bad. This is where Old School tuning comes in with your adjustable fuel pressure regulator and reading the plugs. Same thing with Timing. It only adjusts for overall advanced timing. base timing is set by YOU. more advance in your base timing the better as long as you don't get knock.

Once you get all that dialed in you get with a reputable chip burner and give him your info of your motor and get a dyno run in with AF and send him all the info. with a well burnt chip on a STOCK motor you *Could* pick up 20-30 rwhp. on a modified or modified stroker you *Could* see upto 30+ rwhp.

Thanks for all the info.

 

[WhalePirot]

maybe I should go with Carb system.

No...Don't do it! :cry

Besides, I am not sure it will simplify things all that much, overall. I truly love the loping idle of my 406, at 850-900 rpm, where not one expert said it would ever run. I get decent fuel economy when I am not IN it hard and the car passed CA smog testing. The motor shreds the tires and all but one hot bike, so far. Try all that with a carb!

Even the amatuers know this car is not to be toyed with.

 

[oldvet]

No...Don't do it! :cry

Besides, I am not sure it will simplify things all that much, overall. I truly love the loping idle of my 406, at 850-900 rpm, where not one expert said it would ever run. I get decent fuel economy when I am not IN it hard and the car passed CA smog testing. The motor shreds the tires and all but one hot bike, so far. Try all that with a carb!

Even the amatuers know this car is not to be toyed with.

Thanks for the info. Still haven't decided. I just had the heads redone after the gasket broke. Check compression yesterday with after the engine sat all night. Didn,t warm it up. I had 155 lbs pressure on all four cyclinders. So I,am getting a gut feeling that the guys who did my head messed up when he put them on or the heads weren,t check thoroughly. ???????? I don,t get any smoke on start up, then about 1 minutes after the smoke starts to ooze out the tailpipe. as it gets hotter the smoke get thicker.

 

[Chris Kennedy]

Thanks for asking this question. In my own case, I would probably not be looking for an uprated engine, but simply for an L98 replacement engine from another Corvette.

/s/ Chris Kennedy

 

[bossvette]

TPI

there are basically two baseplates, two plenums, two Throttle bodys; early and late or MAF /Speed density they can be switched around to put an early MAF system on a pre 89 (roller cam) block or vice versa. If you were to put your 89 system on early heads you will have to elongate the two center bolts in the baseplate for instance or buy an early baseplate.

Street and performance http://www.hotrodlane.cc/ has a real good video on TPI systems that details rebuilding and modifing them to suit; what works with what and what the differences are. click on the link for TPI video on the home page for a preview

I have done two TPI conversions and would not put a Carb on anything I was going to drive :ugh Carb whats that

 

[Edmond]

Carb whats that

I think food has carbs. :L

 

[oldvet]

there are basically two baseplates, two plenums, two Throttle bodys; early and late or MAF /Speed density they can be switched around to put an early MAF system on a pre 89 (roller cam) block or vice versa. If you were to put your 89 system on early heads you will have to elongate the two center bolts in the baseplate for instance or buy an early baseplate.

Street and performance http://www.hotrodlane.cc/ has a real good video on TPI systems that details rebuilding and modifing them to suit; what works with what and what the differences are. click on the link for TPI video on the home page for a preview

I have done two TPI conversions and would not put a Carb on anything I was going to drive :ugh Carb whats that

thanks, this will help in making a decision.