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View Full Version : q45 throttle body on rb25det???

Popscribble
02-18-2009, 01:07 AM
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
eh?
02-18-2009, 07:08 AM
You're using the greddy intake right? It's just a straight foward r/r.
ANVIL
02-18-2009, 09:18 AM
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
Popscribble
02-18-2009, 12:01 PM
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?
eh?
02-18-2009, 12:41 PM
The Q45TB is not bolt on, what are you doing? It's probably too big to fit in the stock location.
timlush
02-18-2009, 12:49 PM
It does not bolt on to the stock manifold. It's only a direct bolt on to the Greddy (style) manifold
Popscribble
02-18-2009, 03:49 PM
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
beats13bob
09-30-2009, 03:22 PM
they make an adapter
eh?
10-01-2009, 05:42 AM
they make an adapter

Doesn't matter it's too big to fit the stock location.
shogun!
10-01-2009, 08:31 AM
Of topic since it is on a ca18det but may give you an idea.

http://200sx.kicks-ass.net/shogun/img461875c994644.jpg

http://200sx.kicks-ass.net/shogun/img4a886950cdfb0.jpg

http://200sx.kicks-ass.net/shogun/img4a886951686cd.jpg
Kinugawa turbo
10-03-2010, 01:46 AM
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?
Sileighty_85
10-03-2010, 04:52 AM
Does the Q45 throttle body TPS fit a series 2 RB25det?

From what ive heard no it wont, it uses a differnet voltage signal
lazyeyes13
02-26-2014, 06:43 AM
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??
lazyeyes13
02-26-2014, 07:08 AM
Also could anyone provide a pic showing where the iacv goes on the q45 tb??
ultimateirving
02-26-2014, 07:12 AM
Also could anyone provide a pic showing where the iacv goes on the q45 tb??

iacv goes on the intake if im not mistaken
lazyeyes13
02-26-2014, 07:25 AM
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
Darius
03-04-2014, 02:42 PM
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.