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Old 04-11-2010, 07:04 PM   #1
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Default Throttle body compatibility NB to NA

I collected a few extra parts this weekend, including an NB throttle. My car has an MP62 on the '94 1.8L engine. The factory throttle body is still sticking on me despite cleaning it twice and polishing the inside. It doesn't stick off the car, but the moment it's bolted to the supercharger it becomes a pain in the ***. I can't explain it, it just doesn't open and close smoothly.

SO, I want to try dual throttle bodies with the NB body (cleaner, newer, smoother all around). I would like the NB body (w/TPS) bolted to the NA intake manifold, and the NA body bolted to the supercharger inlet.

My questions:
Will the NB throttle body bolt up to the NA intake manifold?
Is the NB TPS output same as the NA TPS output? i.e. If I can't bolt the NB throttle body to the NA intake manifold, can I at least use it to replace my sticky NA throttle body?

Sorry, rattling this off my head as I think of it. Ask questions if that all didn't make sense. thanks!
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Old 04-11-2010, 07:49 PM   #2
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Until you sort out that sticky problem don't go adding complexity by going dual throttles. Remember DTB means using both throttle bodies and they both have to move freely and smoothly.

I don't know about interchangeability but you should just try it - it'll fit or it won't.
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Old 04-12-2010, 02:11 AM   #3
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Have you checked to make shure the throttle plate is not hitting something. I have not read other threads about your problems.

Have a great day,
Jared
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Old 04-12-2010, 10:09 PM   #4
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Yes. That was what I found the first time. It was hitting the brake line and holding open. Now it's just sticky. I'm not too worried about it. At least it's not a Toyota .
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Old 04-13-2010, 04:11 AM   #5
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AFAIK all 1.8 throttle bodies are interchangeable. I've had my '94 TB on a '94 IM, a '99 IM, and a 2002 IM.
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Old 04-13-2010, 05:32 AM   #6
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That is wierd. It works just fine out of the car? I not then may be the shaft is bent. As far as hitting something what about inside of the TB or IM?Just a thought.

Have a graet day,
Jared
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Old 04-13-2010, 09:41 AM   #7
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Quote:
Originally Posted by Savington View Post
AFAIK all 1.8 throttle bodies are interchangeable. I've had my '94 TB on a '94 IM, a '99 IM, and a 2002 IM.
Aflak! Change my insurance to get my throttle body to work!?
Sorry, what does the acronym mean?

Thanks for the info Savington. It sounds like my best bet is to go out this weekend and test fit it.

Yeah, Jfornachon, I have trouble understanding it right now too. I would hate to pull it apart again, but it almost looks inevitable to pull the shaft and figure out what's bad.
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Old 04-13-2010, 10:51 AM   #8
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Originally Posted by cymx5 View Post
aflak! Change my insurance to get my throttle body to work!?
sorry, what does the acronym mean?
gfe (Google fskin exists)
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Old 11-29-2011, 08:34 PM   #9
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Sorry to bring back such an old/dead thread, but I have a question that seems relevant to the original post:

Will the IAC valve from a 99 throttle body function the same as the valve from a 97 Miata (are the ECU controls for the valves similar)? Will a 97 TPS fit on a 99 throttle body?

In other words, could you swap a 99 throttle body onto a 97, reuse the 97's 4-wire TPS on the new throttle body, and have it work normally without changing a bunch of other things? Looks like I might have to change the connector on the harness for the IAC valve, but would the valve itself still function about the same?
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Old 11-30-2011, 05:12 AM   #10
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Quote:
Originally Posted by jnshk View Post
Will the IAC valve from a 99 throttle body function the same as the valve from a 97 Miata (are the ECU controls for the valves similar)?
They run at wildly different frequencies. At best the 99 valve will be rather noisy in operation, at worst it'll have horrendous resolution and will provide really poor idle control. But other than that they work the same way i.e. they're both PWM controlled 2 wire solenoids.

Quote:
Will a 97 TPS fit on a 99 throttle body?
Nope.
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Old 11-30-2011, 08:09 AM   #11
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Thanks for the clarification!
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Old 12-02-2011, 04:50 AM   #12
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If you're re-using the bolts from your 94-97 throttle body, one of them will be too short. It's annoying.
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