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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 02-18-2009, 01:07 AM   #1
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RB q45 throttle body on rb25det???

I have a series 1 rb25det in my s13 and i dont know how to install the q45 (90mm) throttle body. I know it fits directly but i would like some reassurance, any pics or advice would be great, btw its stock cept for 3" tbe runs like a dream
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Old 02-18-2009, 07:08 AM   #2
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You're using the greddy intake right? It's just a straight foward r/r.
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Old 02-18-2009, 09:18 AM   #3
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fits directly only if you are using a greddy (style) intake manifold. also the tps is the same so u can use either q45 or rb25 with your S1 incase it didnt come with one
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Old 02-18-2009, 12:01 PM   #4
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no its the stock over the top manifold, will the throttle cable from the rb fit the q45 or do i need to swap it out?
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Old 02-18-2009, 12:41 PM   #5
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The Q45TB is not bolt on, what are you doing? It's probably too big to fit in the stock location.
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Old 02-18-2009, 12:49 PM   #6
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It does not bolt on to the stock manifold. It's only a direct bolt on to the Greddy (style) manifold
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Old 02-18-2009, 03:49 PM   #7
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oh my bad from what ive heard its a direct bolt on to the stock mani i guess that idea is a fail thanks anyways guys
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Old 09-30-2009, 03:22 PM   #8
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they make an adapter
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Old 10-01-2009, 05:42 AM   #9
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they make an adapter
Doesn't matter it's too big to fit the stock location.
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Old 10-01-2009, 08:31 AM   #10
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Of topic since it is on a ca18det but may give you an idea.





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Old 10-03-2010, 01:46 AM   #11
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Quote:
Originally Posted by Popscribble View Post
I have a series 1 rb25det in my s13 and i dont know how to install the q45 (90mm) throttle body. I know it fits directly but i would like some reassurance, any pics or advice would be great, btw its stock cept for 3" tbe runs like a dream
Does the Q45 throttle body TPS fit a series 2 RB25det?
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Old 10-03-2010, 04:52 AM   #12
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Does the Q45 throttle body TPS fit a series 2 RB25det?
From what ive heard no it wont, it uses a differnet voltage signal
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Old 02-26-2014, 06:43 AM   #13
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Bringing up an old topic here! I have a s1 rb25 with a greddy intake and a q45 tb and I guess im missing the idle air control valve?

Im not sure where it even goes...

Anyone know what year q45 throttle bodies are used with rb25 so I could get one??
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Old 02-26-2014, 07:08 AM   #14
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Also could anyone provide a pic showing where the iacv goes on the q45 tb??
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Old 02-26-2014, 07:12 AM   #15
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Quote:
Originally Posted by lazyeyes13 View Post
Also could anyone provide a pic showing where the iacv goes on the q45 tb??
iacv goes on the intake if im not mistaken
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Old 02-26-2014, 07:25 AM   #16
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well the guy that had it before me has some lines on the throttle body plugged up so maybe that's got something to do with it...

I just don't see anywhere that it could go... Ill post a pic of the plugged up lines later
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Old 03-04-2014, 02:42 PM   #17
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The RB25 IACV is normally located underneath the Greddy manifold with the adjustment screw facing the passenger side strut tower. It should be turned all the way clockwise and then backed out 1/4 to 1/2 turn.

As far as the Q45 TB goes, it has a secondary spring assembly on the throttle plate that needs to be removed in order for the engine to compensate correctly. Also, there are two vacuum lines that need to be capped on the TB so it doesn't bleed unmetered air into the system.
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