I'm wondering what the difference is between the TPI system on a 305 and a 350 is. I know that the 350 set-up comes with different injectors but is that the only difference between the two? The only other thing that i can think of that would be different would be the computer set-up.

The reason I'm asking id that I'm looking for a new thirdgen to put a 350 in and the 305s are cheaper to get hold of.

So can someone please give me info on converting it over to work on a 350?

Also, what is the maximum power levels I can use with the stock TPI?? I'm thinking about getting a ZZ430 block for it. Should be fun


Thanks for the help.


RMK

 

PROM is different, injectors are different (19# as opposed to 22#) . TPI hardware is exactly the same.

 

ZZ430? I thought they were limited production, and sold out? Am I thinking of something different?

------------------
If you live in Southeastern US, check us out!
South East Thirdgen


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Ported Plenum,
TB Coolant Bypass,
SSM SFC,
Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
KYB Shocks

'97 Bonneville SSE

 

I don't think GM offers the ZZ430 either, but if you add the LT-4 Hot Cam kit to the Fastburn 385HP 350, you end up with a ZZ430.

But forget about using the TPI system with a ZZ430. IMO, it is a mismatch to the LT-4 Hot Cam and the Fastburn heads won't bolt up to the TPI intake base.

 

The ZZ430 was a limited run by GM but there are still companies who will build you one to the same specifications as the one offered by GM.

Have a look at:
http://www.sallee-chevrolet.com/Chev...V8s/PUZZ4.html

For more info.

Also, is the TPI going to be cabable of working with this motor without siamised runners or anything like that?

Thanks again.

 

Thanks for the info. What about a new manifold? I sem to remember hearing something about GM bringing out a new manifold for the TPI so that it could be hooked up. Maybe not though.

RMK

 

Aren't the knock sensors and ESC modules different between the 5.0 and 5.7 also??

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Kevin Irving
85 Trans Am WS-6, 305 TPI, custom burned '86 PROM with '87 "165"ECM, Accel Supercoil & 8.8 Wires, MSD 6AL, Aluminum Driveshaft, TB Coolant Bypass, Ported Plenum, Modified MAF, Cyclone Fuel Pump, JET Airfoil

http://www.geocities.com/transam85tpi/TransAm.html

 

Yep the KS sensor are supposed to be different also.

 

What exactly are the knock sensors and ESC modules? I'm not familiar with them.

 

Scoggin Dickey is coming out with an intake manifold for TPI cars, that will work with the Vortec and Fast Burn heads. Check their message board here. They say it will be ready at the end of the year, or the beginning of next year.

The knock sensor "listens" for detonation in your engine, and the ESC sensor (built into the computer on speed density cars) tells the computer to back off the timing to stop the detonation.

 

Can anybody prove with factual information other than different part numbers that the knock sensors ARE different?

Knock sensors create a frequency that varies with engine kock. It is up to the PROM to interpret the freqeuncy to consider what is "normal" and what is not "normal". Therefore, the sensors should be the same, but up to the PROM to determine.

------------------
If you live in Southeastern US, check us out!
South East Thirdgen


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Ported Plenum,
TB Coolant Bypass,
SSM SFC,
Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
KYB Shocks

'97 Bonneville SSE

 

The PROM does not have any sort of frequency sensing equipment. I believe the knock sensor creates a voltage based on resonance. The ECM then analyzes this voltage. The 305 and 350 most certainly DO have different part numbers because they are tuned to specific resonant frequencies.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

I have wondered a long time about this knock sensor question. I would think that the 350 knock sensor would be less sensitive than the 305, on the basis that the 350 would be noisier since it is larger. Now based on this theory, could we find a 454 knock sensor that would be even less sensitive?
Of course no one really seems to even know what the difference really is. Opinions?

 

Well, shame on me, no, the PROM doesn't have any frequency reading ability for the knock sensor, and that is what the ESC Module is for, but it would seem that the sensor should be universal, and then the ESC Module would be "tailored" to each individual motor.

------------------
If you live in Southeastern US, check us out!
South East Thirdgen


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Ported Plenum,
TB Coolant Bypass,
SSM SFC,
Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
KYB Shocks

'97 Bonneville SSE

 

The 305 and 350 blocks have a different resonant frequency that the knock causes. The knock sensors are specifically tuned to "hear" a very narrow frequency band centered at the resonant frequency. I'm not a Knock Sensor expert, but I know beyond a shadow of a doubt that they absolutely are different. My 350 knocked with the 305 sensor and threw codes. I bought a 350 sensor (different part number) and it stopped knocking.

It doesn't have anything to do with sensitivity, so a 454 knock sensor will not do you much good. If you want it less sensitive, run a layer or 2 of teflon tape over the threads before you install it.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah