doing a th350 swap
09-01-2012, 09:13 AM
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Car: 87 iroc z
Engine: 5.7 tpi
Transmission: 350 turbo
Axle/Gears: stock for now
doing a th350 swap
have a couple questions on the swap. im pretty sure i have everything to make it happen, except having concerns on where to tap my vaccum off of my tpi intake
09-02-2012, 12:29 AM
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Car: 87 iroc z
Engine: 5.7 tpi
Transmission: 350 turbo
Axle/Gears: stock for now
Re: doing a th350 swap
ok. the one to the fuel regulator is more to the top of the plenum correct? because i cant think right off hand where the one to the ac comes off at on that side
09-02-2012, 11:01 AM
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Car: 87 iroc z
Engine: 5.7 tpi
Transmission: 350 turbo
Axle/Gears: stock for now
Re: doing a th350 swap
alright. i got the crossmember and torque arm kit from spohn. a driveshaft that is 3 inches longer than my stock one for the 700r4. and im having a local shop build the 350 trans. and is the non lock up style, didnt know if that will affect me? dont really think it will but im not as fimiliar with the whole computer/fuel injected scene. so my question is, will the th350 non lock up style be compatiable with me "tpi system"
09-02-2012, 11:16 AM
#7
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Car: 87 iroc z
Engine: 5.7 tpi
Transmission: 350 turbo
Axle/Gears: stock for now
Re: doing a th350 swap
oh i got too lookin at my intake and has no vaccum port there, heres a pic of my intake in that general area
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09-02-2012, 12:05 PM
#10
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Car: 87 iroc z
Engine: 5.7 tpi
Transmission: 350 turbo
Axle/Gears: stock for now
Re: doing a th350 swap
oh ok got ya, didnt pay attention to the "disregard the red circle". and 'utilityguy2' could you shed some light to the question regarding the non lock up convertor trans?
09-02-2012, 04:35 PM
#13
Re: doing a th350 swap
The vehicle speed sensor is in the transmission tail shaft on passenger side usually. It has a two wire electrical connection. I don't know if your car had the mechanical speedometer with the yellow buffer box or the VSS. If you have the mechanical cable going to the speedo then the VSS is built into that and is 2000 pulse per mile but if the car was originaly a electrical tranmission mounted VSS then it was a 4000 ppm unit.but either way the ECM needs that pulse per mile speed input to work correctly. Also makes a difference if you converted to SD from MAF and changed from 1227165 ECM to a 1227730. I don't know what you had before the 350 but you are most likely going to need a Memcal programmed for the change also.
09-02-2012, 05:47 PM
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: doing a th350 swap
MAF TPI and TBI ECM used 2000 pulse input ; from VSS or buffer
09-02-2012, 06:47 PM
#15
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Car: 87 iroc z
Engine: 5.7 tpi
Transmission: 350 turbo
Axle/Gears: stock for now
Re: doing a th350 swap
it was a 305 tpi car. when i swapped the motor i used the computer from that car, has the mechanical speedo. not sure on the ecm # thats in the car now but the 305 one was the 1227165. it still has the MAF. not sure what the sd is tho. im havin the trans built this week. should i tell him i need a 2000ppm vss? sorry this is new to me
09-02-2012, 07:51 PM
#16
Re: doing a th350 swap
I'm not sure which ECM you are using, as that helps define what hardware is required for the VSS.
The VSS sensors that go into the trans are all 4 pole magnetic units (4000 PPM).
The VSS sensors that go into the speedo cluster are all 2 pole optical units (2000 PPM).
The MAF TPI & SD TBI ECMs require a 2000 PPM input. These ECMs were used with both the optical VSS and the magnetic VSS. When used with a magnetic VSS a 4-OUT Buffer box was also used. This box buffered the VSS signal and presented it to the cruise, ECM, and speedo (when required). It generates the 2000 PPM signal for the ECM to use.
The SD TPI & SD MPFI ECMs (the '7730) require the 4000 PPM VSS signal. The ECM acts as the 4-OUT Buffer and sends pulse streams to the speedo & cruise. And uses the signal internally.
The optical VSS unit is a digital output.
The magnetic VSS unit is an A/C signal output.
The 4-OUT Buffer converts the A/C VSS signal to digital signals.
RBob.
The VSS sensors that go into the trans are all 4 pole magnetic units (4000 PPM).
The VSS sensors that go into the speedo cluster are all 2 pole optical units (2000 PPM).
The MAF TPI & SD TBI ECMs require a 2000 PPM input. These ECMs were used with both the optical VSS and the magnetic VSS. When used with a magnetic VSS a 4-OUT Buffer box was also used. This box buffered the VSS signal and presented it to the cruise, ECM, and speedo (when required). It generates the 2000 PPM signal for the ECM to use.
The SD TPI & SD MPFI ECMs (the '7730) require the 4000 PPM VSS signal. The ECM acts as the 4-OUT Buffer and sends pulse streams to the speedo & cruise. And uses the signal internally.
The optical VSS unit is a digital output.
The magnetic VSS unit is an A/C signal output.
The 4-OUT Buffer converts the A/C VSS signal to digital signals.
RBob.
I believe RBob is correct, so my statement should also be correct. If we are both wrong then I'm sorry about that.
09-02-2012, 07:56 PM
#17
Re: doing a th350 swap
it was a 305 tpi car. when i swapped the motor i used the computer from that car, has the mechanical speedo. not sure on the ecm # thats in the car now but the 305 one was the 1227165. it still has the MAF. not sure what the sd is tho. im havin the trans built this week. should i tell him i need a 2000ppm vss? sorry this is new to me
Last edited by utilityguy2; 09-02-2012 at 07:59 PM. Reason: added info
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