Will a TPI 305Hypertech Chip Work on a 350?
11-03-2014, 05:05 PM
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Car: 89' Formula, 77' Vette, 71 Lemans
Engine: TPI 350, Supercharged 350, Pont 400
Transmission: 700R4, TH400, TH400
Axle/Gears: 2.73, 3.08, 3.73
Will a TPI 305Hypertech Chip Work on a 350?
Doe's anybody know why or if a Hypertech chip that will work on a TPI 305 not work on a 350? Seems like just a marketing trick just to sell more chips. Anybody tried it? It's practically the same engine except for the bore. Let me know what you think....
11-03-2014, 07:07 PM
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Car: 91 formula ws6
Engine: 355 tpi OBDII
Transmission: 4l60E
Axle/Gears: 2.73 with 4th gen brakes
Any given engine displacement has its needs at any given range. A 305 needs a lot less fuel at 2500 rpm then a 350 at 2500 rpm. The programming is different to show that. That's only one spec but hopefully you get the point.
11-04-2014, 08:45 AM
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Car: 89' Formula, 77' Vette, 71 Lemans
Engine: TPI 350, Supercharged 350, Pont 400
Transmission: 700R4, TH400, TH400
Axle/Gears: 2.73, 3.08, 3.73
Re: Will a TPI 305Hypertech Chip Work on a 350?
That's a given. But wouldn't the 02 Sensor tell it, it's running lean and adjust the injector pulse? I'm not trying to be a smart A** just asking the question. I'm putting a TPI 350 out of a C4 Vette in place of my TPI 305. That's why I'm asking. I already have the chip for the 305.
11-04-2014, 09:54 AM
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Car: 91 formula ws6
Engine: 355 tpi OBDII
Transmission: 4l60E
Axle/Gears: 2.73 with 4th gen brakes
There's a lot more involved, but I'm not the expert. Ill step aside and let a senior member explain. I know a lot has to do with knock and timing.
11-04-2014, 10:44 AM
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Car: 89' Formula, 77' Vette, 71 Lemans
Engine: TPI 350, Supercharged 350, Pont 400
Transmission: 700R4, TH400, TH400
Axle/Gears: 2.73, 3.08, 3.73
Re: Will a TPI 305Hypertech Chip Work on a 350?
I spoke with Hypertech. They said the Fuel/Air ratio is different and so is the timing curve. Sucks! I have a chip for the vette engine and one for the formula engine. And I can't use either one. Unless I use the wiring harness and computer for the vette. I have a 1989 Formula and I bought a 1990 Vette engine. Come to find out. In 1990 the corvette TPI engine changed from MAF to MAP so it's completely different. Oh well. I guess I'll have to buy the one for the Pontiac 350. I think that sounds a lot easier than rewiring the car. Any suggestions on who makes the best one these days for that year???
11-04-2014, 11:33 AM
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Car: 89 Formula
Engine: 383 SBC/HSR
Transmission: 700R4
Axle/Gears: 3.73
Re: Will a TPI 305Hypertech Chip Work on a 350?
I have an 1989 350, ADS Chip I can sell you. It's the same as Hypertech.....it was in my 1989 Formula 350, with 700R4.
Let me know if want it. I can send you a pic if you want.....comes in the original box.
Let me know if want it. I can send you a pic if you want.....comes in the original box.
Last edited by heat seeker; 11-04-2014 at 11:46 AM.
11-04-2014, 02:05 PM
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Car: 89' Formula, 77' Vette, 71 Lemans
Engine: TPI 350, Supercharged 350, Pont 400
Transmission: 700R4, TH400, TH400
Axle/Gears: 2.73, 3.08, 3.73
Re: Will a TPI 305Hypertech Chip Work on a 350?
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11-04-2014, 04:29 PM
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Car: 89 Formula
Engine: 383 SBC/HSR
Transmission: 700R4
Axle/Gears: 3.73
Re: Will a TPI 305Hypertech Chip Work on a 350?
I'll take $85 - shipped to your door. I'll PM you my payment Info.
I can ship it out tomorrow morning.
I can ship it out tomorrow morning.
11-09-2014, 10:10 AM
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Re: Will a TPI 305Hypertech Chip Work on a 350?
That's a given. But wouldn't the 02 Sensor tell it, it's running lean and adjust the injector pulse? I'm not trying to be a smart A** just asking the question. I'm putting a TPI 350 out of a C4 Vette in place of my TPI 305. That's why I'm asking. I already have the chip for the 305.
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