1G Q45 throttle body guys help? (Tps, and iac questions)

[Geeb]

I just bought a jmf drag/q45 for my 1990 dsm. I'm just going to lead off with, I'm not great with electrical.. I'm sure this stuff can be easily explained, if someone can just help me out.

First off I'm not sure which part of the tps I'm supposed to wire out to the harness. The 3 prongs that are on the tps itself that looks like the square style connector, or the 3 prong (more of a circle) connector that's hardwired into the tps. -Check the first pic to see which I'm talking about. Index finger is the box one, middle finger Is the rounded wired one.

Or do I use both? -See second pic of diagram. Is that how it's supposed to be wired? I know its from an evo website. Regardless of which, can anyone explain it a little further, in layman's terms?
--ps. I didn't get any pigtails with the TB, so I'm trying to figure out which one I need, or if I need both.

Second off.. I saw a lot of people talking about cold start issues due to the butterfly valve and needing coolant lines for it to work properly.. And also saw a lot of people blocking off the coolant lines or deleting them permanently. Mine are welded shut. How will this affect the cars driveability?

I was under the impression that the cold start issues were caused by the throttle bodies lack of IAC(isc)? Because of this, I ordered a part to remote mount the stock dsm iac.. Will doing this clear that up? Or are there additional issues that make cold start ups and low speed driveability less than fun..

Basically all my questions lead to, what do I have to do to install this, and how do I get it to behave as close to normal as possible...

Thanks guys.

 

[Eddie Tsi]

I just bought a jmf drag/q45 for my 1990 dsm. I'm just going to lead off with, I'm not great with electrical.. I'm sure this stuff can be easily explained, if someone can just help me out.

First off I'm not sure which part of the tps I'm supposed to wire out to the harness. The 3 prongs that are on the tps itself that looks like the square style connector, or the 3 prong (more of a circle) connector that's hardwired into the tps. -Check the first pic to see which I'm talking about. Index finger is the box one, middle finger Is the rounded wired one.

Or do I use both? -See second pic of diagram. Is that how it's supposed to be wired? I know its from an evo website. Regardless of which, can anyone explain it a little further, in layman's terms?
--ps. I didn't get any pigtails with the TB, so I'm trying to figure out which one I need, or if I need both.

Second off.. I saw a lot of people talking about cold start issues due to the butterfly valve and needing coolant lines for it to work properly.. And also saw a lot of people blocking off the coolant lines or deleting them permanently. Mine are welded shut. How will this affect the cars driveability?

I was under the impression that the cold start issues were caused by the throttle bodies lack of IAC(isc)? Because of this, I ordered a part to remote mount the stock dsm iac.. Will doing this clear that up? Or are there additional issues that make cold start ups and low speed driveability less than fun..

Basically all my questions lead to, what do I have to do to install this, and how do I get it to behave as close to normal as possible...

Thanks guys.

Tps is connected to the pigtail connector on the tb side,(middle finger in your first pic) at least that how I use to have mine connected. Isc relocation kit will help with cold start and drivability. Without it I had to pedal the gas on cold start and driving before the engine warmed up. Even with the isc the car would stall occasionally on hard stop.I eventually switched to the S-90 tb due to a boost leak on throttle shaft seal, also the S-90 unit, so much simpler. Plug and play, no ill effect.

 

[Geeb]

I wanted a s90. But I got these 2 so cheap.I figured I'd give it a test run n see whats up.. I'm still gathering parts. Once I get everything I basically need/want I'll start the overhaul. Ugh I have so much $ invested already and yet a ways to go. Oh well, I'll get there.

Thanks for the input.

If anyone else can chime in I'd appreciate it.

 

[Geeb]

Anyone else have any input? I've heard people say either one so far and just want to know anyone with any experience please help guys.

Wire it to middle finger or index? See pic...

Or does anyone make an adapter these days for a dsm tps to work in the q45?

Thanks guys...

 

[DSMPT]

Anyone else have any input? I've heard people say either one so far and just want to know anyone with any experience please help guys.

Wire it to middle finger or index? See pic...

Or does anyone make an adapter these days for a dsm tps to work in the q45?

Thanks guys...

The 3 wires pigtail with middle finger is for the TPS and one from the connector with index finger is for the idle switch.
You can use the pigtail connectors in link below and a TPS pigtail connector from 90 throttle body. Those make the work so much easier. (That is I did for my 90 gsx)
Hope this helps you,
http://www.ebay.com/itm/Wiring-Spec...ash=item463a4f53ee:g:wMoAAOSwPe1T4ym2&vxp=mtr
http://www.ebay.com/itm/TPS-throttl...ash=item25bb1357dd:g:78MAAOSwaZdXIWh3&vxp=mtr

 

[Geeb]

Idle switch?most people just don't use that 1 at all I thought it was TPS pigtail only...?

 

[DSMPT]

Idle switch?most people just don't use that 1 at all I thought it was TPS pigtail only...?

If you don't need it, just don't use it. Forgot to mention that if I recall correctly one of pin on the open/close switch need to be connected to the ground or a 5V source.

 

[Geeb]

If you don't need it, just don't use it..

How do you know if you need to use it or not?

 

[DSMPT]

Idle switch?most people just don't use that 1 at all

Well you said that. I used that as a throttle close/wot switch for EMS.

 

[Geeb]

Only reason I said that was because most people I asked said "use the wired part, disregard the rest"

Are they wrong? I already got a pigtail for the middle finger one in the pic up there (rounded, not boxed) wired into my tucked wire harness where the stock 3 wire tps connector was wired into...

Where would the boxed connector get wired into? You said you only used it for a WOT/throttle close switch? Does that basically tell your ems when you have your foot off the pedal and when your to the floor?

 

[DSMPT]

Only reason I said that was because most people I asked said "use the wired part, disregard the rest"

Are they wrong?

No, they are not wrong, they are right. At least you need the 3 wire pigtail connected to make the TPS worked properly.

Where would the boxed connector get wired into?

If you don't need to keep the idle switch then just disregard the boxed connector.
If you use the stock ECU and want to keep the idle switch then use 2 pins from the boxed connector, the middle and the bottom. Connect the bottom pin to the idle switch wire on the harness side and the middle one to the ground. this makes the bottom pin grounded when the throttle is closed.

You said you only used it for a WOT/throttle close switch?

Yes right, I use it as a WOT switch. (using 2 pins from the boxed connector, the top and the middle).

The top pin : Wide open
The middle pin : Ground (or if I remember correctly also 5V source)
The bottom pin : Closed

 

[Geeb]

Good info thanks man... Never heard of or saw anyone using the second (boxed) connector.. So that's interesting.. I'm using a 1990 ecu but with ecmlink....

I just hope that I can get it to have a smooth idle and get it to behave at lower speeds when I take it on the street.

 

[DSMPT]

If you have ECMLink then you will be able to have a smooth idle. Good luck!

 

[Geeb]

Yup. V3. Thanks again man