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Rb25 Throttle Body

tm_r33

By tm_r33,
in Engines & Forced Induction

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tm_r33 Experienced

tm_r33

Posted
Posted

Hey all.

Im currently finishing off the new engine for my track car. The car is a series 2 r33 gtst and its a rb25/30 not that it should make a difference though. I have a greddy manifold on it and am looking around on the net for a throttle body.

I want one that bolts on to greddy manifold as im dont want to weld different flange on like some of the cheap shit requires.

Now I have noticed that some of the throttle bodys to suit rb25 and greddy plenum are specific to series one tps.

Now are they meaning that series one and series two r33 have different tps?

Or do the mean that the neo rb25 is a series two rb25 and they are calling all r33 gtst engines a series one rb25. I know of a few differences between s1 and s2 r33 gtst rb25 but havnt noticed the tps being different.

Can some one tell me where they have bought an 80mm inside diameter TB that suited a greddy or greddy style plenum and interfaced correctly with their tps and throttle cable etc in a s2 r33 gtst

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https://www.sau.com.au/forums/topic/358214-rb25-throttle-body/
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Jack88 Experienced

Jack88

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Posted

You will need a S13 silvia throttle cable as the R33 one isnt long enough and once fitted sits on too much of an angle. I bought a 80mm throttle body from a ebay store for my 25/30 ( im also runing the Greddy manifold) and insted of welding the spacer to the plenum that came with it i had the throttle body bolt holes re drilled so it would bolt right onto the plenum( the bolt hoels were only about 2mm out anyway. I also had a gouge machined out on the face of the throttle body to hold a O ring so it seals up against the plenum nicely and wont leak. Another issue with the ebay throttle bodys is the spindle that inserts into the TPS is too small and has alot of free play so you dont get an accurate reading from the TPS so you have to have the spindle built up with small welds then sanded to fit inside the TPS snugly.

The series one TPS is spindle driven and has one plug fixed to the side of it with another on a 5cm fly lead coming out of it. Series two TPS have two plugs fixed to the plastic body of the TPS and the way they mount to the throttle body is different ( When i bought my Greddy manifold it had a R34 TPS on it and its completly different to the series one R33 unit. I think the R33 series two TPS is the same as the R34 one. Also the pin out on the series one and two TPS is different so they are not plug and play but can be rewired to work.

Save yourself the hasle and just get the TPS which suits your engine loom.

NYTSKY Grand Master

NYTSKY

Posted
Posted

I have just upgraded to a Q45 throttle body so my Greddy throttle body adaptor is for sale.

Bolts straight onto the Greddy plenum and allows you to keep the standard throttle body.

Also has the Greddy logo on it to match the plenum :)

$100 Delivered.

tm_r33 Experienced

tm_r33

Posted
  • Author
Posted

Thanks for the info jack88. so by the sounds of it I should be searching for an r 34 gtt throttle body?

Do I uee sr20 or ca18 s13 throttle cable?

Ia also dont like the idea of the spindle being poxy and having play on cheeap items so it lools like ill have to buy jap which I bet will cost an arm and a leg. Any local options?

Thanks for the offer nytsky but im after an 80mm item. Will an aftermarket Q45 TB fit my wiring or do they suit S1 r33?

tm_r33 Experienced

tm_r33

Posted
  • Author
Posted

I just assumed all these q45 TB I see on ebay was dodgy after market replacements for the q45. I didnt think they was genuine. And if I use one that means I need to rewire it cause s2 plugs are different and so is the pin layout. I was hoping someone made a plug and play sort of throttle body for series 2.

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