Rb25 Plenum & Tb Experiment

[a31rb25]

Doing a bit of research I discovered that the A32/A33 Maxima has a 72mm TB, which is the size I want to use on a forward facing plenum when I get one.

Would anybody with a suitable plenum (Greddy, Plazmaman, etc) on their RB25 be willing to lend a hand to see if this TB will fit? If my idea works it could save a few people hundreds of dollars as you wouldn't have to buy a billet CNC item for silly amounts of cash.

This won't be until after Xmas but let me know if you're happy to help out - i'll bring beers.

[TiTAN]

you can get an adapter to fit the stock throttle body to the Greddy plenum or just fit a Q45 throttle body. why go to the effort of reinventing the wheel?

[a31rb25]

you can get an adapter to fit the stock throttle body to the Greddy plenum or just fit a Q45 throttle body. why go to the effort of reinventing the wheel?

Having spoken to Plazmaman they recommended the 72mm TB over an 80mm or 90mm item for better response, so that's what i'm planning on using. Given that a lot of Nissan parts are interchangable I'd thought I'd see if this would work on one of their plenums. If the bolt hole locations are different I'll see how much TRD will charge to machine an adapter plate. The last thing I had them machine for me was insanely cheap, so I doubt this will cost much. All up I reckon it would be cheaper than a Plazmaman TB ($500) to buy the part I want & have an adapter machined.

Why spend $500 when i don't have to?

[zebra]

why not just buy the plenum from plazmaman that fits the std TB?

and of course he will tell you that "his" 72mm squillion dollar TB is better than an ebay 80mm one or the standard one.

In my experience changing throttle bodies on car that doesnt have ITBs does sweet FA especially boosted ones....there are plently of 350rwkw+ rb25s running around with the standard intake/TB combo

[a31rb25]

why not just buy the plenum from plazmaman that fits the std TB?

and of course he will tell you that "his" 72mm squillion dollar TB is better than an ebay 80mm one or the standard one.

In my experience changing throttle bodies on car that doesnt have ITBs does sweet FA especially boosted ones....there are plently of 350rwkw+ rb25s running around with the standard intake/TB combo

Standard TB is 60mm, 72mm should give better response - that's the aim for the car as I'm not into dyno figures & dick measuring kw contests, I just want the car to be very responsive for drifting.

Naturally Plazmaman have given me a sales pitch to sell their own TB at 3billion % mark up, so I'm trying to find an alternative. If my plan doesn't work i've lost all of $60 getting the part from Japan (Aussie wreckers wanted $110 or more incl delivery) and can still put the standard TB on.

I've never heard of anybody trying to do this before so I thought I'd give it a shot. Somebody has to think outside the box, otherwise we'd all get ripped off more often.

[zebra]

Im all for giving it a go mate

just saying that dont expect a massive difference, do you have a pic of how the cable mount etc are.

the maxima is FWD so the donk is mounted East-West so while the bolt holes might line up, but there may be a lot of stuffing around getting the cable to line up properly

[a31rb25]

R33

A32

The plug location is different as are some of the lines, but we'll see what happens once I get the plenum. The TB should arrive from Japan in a couple of weeks - i'm buying a few parts at once but most of the shops shut down over the end of year break and don't open until next week at the earliest.

Edited December 31, 2009 by a31rb25