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
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Put a T into the vac line that runs to the A/c from pass side rear of the plenumOriginally Posted by ddrury14
where to tap my vaccum off of my tpi intake not the line going to the fuel reg
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
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There are two vac ports on the plenum ,side by side above the fuel reg ( disregard red circle in pic )Originally Posted by ddrury14
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 
ok. thanks man, been very helpful!
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"
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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That's the manifold with fuel rail, not the plenum which is above that. look above the red circle. two little pipes sticking out of the ribbed plenum.
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?
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The turbo 350 shouldn't be a problem but does it have a VSS (vehicle speed sensor)? That you need.
that i have no idea. never heard of it honestly
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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.
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4000 pulse only used on '90+ SD ('730 ECM ) TPIOriginally Posted by utilityguy2
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. MAF TPI and TBI ECM used 2000 pulse input ; from VSS or buffer
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
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MAF TPI and TBI ECM used 2000 pulse input ; from VSS or buffer
Here is what RBob had to say about it in another post:Originally Posted by vetteoz
4000 pulse only used on '90+ SD ('730 ECM ) TPIMAF TPI and TBI ECM used 2000 pulse input ; from VSS or buffer
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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.
Originally Posted by RBob
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.
I believe RBob is correct, so my statement should also be correct. If we are both wrong then I'm sorry about that.
Member
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No,you have the mechanical speedometer with the 4 output buffer then you are OK. it should already be wired into the ECM. SD is speed density but don't worry about that. You are using MAF and the 1227165 so you're good to go except for maybe a re-programming of the Memcal because of larger injectors.Originally Posted by ddrury14
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