quick90rs

iTrader: (3)

I just got a TPI setup from an 1989 Trans Am GTA with a 350. It is going into my 305 1990 Camaro. My plan is to get a chip with VATS deleted for an 89 trans am GTA with a 350. As long as the injectors are the 350 injectors and the MAF is from a 350. And the knock sensor is from a 350. I should be fine putting all of this on my 305 correct? Will I need any other sensors? Like the VSS? Thanks

quick90rs

iTrader: (3)

Since I need a PROM anyways I am going to buy this one here:
http://www.summitracing.com/parts/MVC-189202V/

It has the VAT disabled its for a 350. I just want to make sure that as long as i am running all the 350 sensors and 350 TPI setup 350 computer and harness and 350 MAF and all that it will be ok on my 305 motor.

quick90rs

iTrader: (3)

Is there an easier way to bypass VATS then getting this chip? Id rather get a stock PROM all i want to know is with all the correct sensors can I put a 350 tpi setup on my 305 using the 350 Computer and PROM and sensors injectors and MAF from a 350.

supamand23

should be fine but think your gonna need a fuel pressure regulator because the 350 needs more fuel than the 305

quick90rs

iTrader: (3)

what type of fuel pressure regulator should i get? A part number or link would be amazingly helpful

supamand23

im not really sure but there is already one on the fuel rail its round an black mabe you can fine a ajudtable one or get one for the 305 or just buy 305 19lbs injectors that would work to whatevers cheapest

quick90rs

iTrader: (3)

I've been told. I cant use the 19 injectors with the 350 computer and PROM. also the cam and heads are OEM from a 305.

elco86

I am not sure on the whole injector thing, I would wait until someone knows the answer to it, but I can tell you that you need a knock sensor for a 305 not a 350, the MAF as far as I know is the same, as far as the prom is concerned I am pretty sure you will need a prom for the 305 not a 350 due to the difference in the knock sensor, A/F ratio and timing there may be other things but I am not sure. TPS, IAC, CTS, IAT are the same for both motors, the O2 I am pretty sure is also but not 100% on that. You should continue searching this site for all the definite answers, or wait for someone else to say for sure. Good luck and have fun.

Grants89iroc-z

if i understand this right, your putting the 350 in place of the 305?
Im running a 350 tpi in place of my old 305 tpi, the only thing i have changed so far is the knock sensor. im running 305 heads, injectors, same computer.

quick90rs

iTrader: (3)

The engine is a 305 LB9 with LB9 heads. I plan to put the tpi setup from a 350 ( just the tpi system) on the 305 engine. Using the 350 injectors,harness,PROM. and 350 knock sensor. Would putting that on my 305 work?

vetteoz

iTrader: (13)

Wrong ;
the 350 injectors are bigger , so more fuel flows at the SAME pressure
The amount of fuel required is supplied by the computer according to the information( tune ) on the Prom; that is why you need a 305 prom on a 305 engine

vetteoz

iTrader: (13)

Correct
Unless you get a custom tune you NEED a 305 prom and 305 injectors in a 305

vetteoz

iTrader: (13)

Easy done.
http://www.joestradingpost.com/vats/89_passkey.htm

iroczen

the knock sensor from maf car and a map car look the same but my not function the same ive seen people have the wrong one and keep getting code 42 also the easiest way around vats if you have to is to take a resistance reading of the key go to radio shack buy one for dirt cheap and solder it inline it will think the right key is always in the ignition

iroczen

the 350 injection will run on the 305 but will probably be rich the injectors spray more fuel for the bigger displacement 350 might be a little much for the 305

Guest

As far as sensors only the knock sensor is different, and having used the 'wrong' one before in both cases (305 and 350) I would not lose any sleep over it. The operation of the knock retard when there was knock and when there was not seemed to be working just fine in my experience. I suspect the minor difference in frequency of sound transmitted through the block is not a big deal. Also, everyone is going to tell you that you HAVE to have the right sensor to pick up that particular frequency, but there is a mountain of evidence of things like exhaust pipes hitting frames and the like triggers the knock sensor. There is also the whole gear drive argument, that the frequency of noise from the gear drive (entirely different than the noise from knock in a 305 or 350) is going to set off the knock sensor but you gotta have the right sensor to pick up the frequency of knock. Its a bunch of nonsense. Cant hurt to use the one for a 305 (you already have one in your 90) but I dont think its a make/break deal.

The injectors and prom, as you know, are also different. You have a few options.

One is to run the 350 chip and live with it. The timing tables and some other things are slightly different between the 305 and 350.

Another is to run the 305 chip, and have the injector constant changed for 22# injectors rather than 19# injectors.

Or, you could get some 19# injectors and run a 305 chip.

Any of those, of course, you're going to have to do something about the VATS if your car is not equipped with it.

The 22# injectors on an otherwise stock 305 may run a little rich at idle, but thats about it.