Drop in injectors for GSX-R Throttle Bodies?

Bow · Post by **Bow** » Thu Jul 06, 2006 3:58 am

Does anyone know of any injectors that will drop straight in to the GSX-R Throttle Bodies?

I am looking for something around 350cc and up for use on an NA 2.4L Nissan 4-banger.

I have the 2002 GSX-R 750 Throttle bodies (Keihin).

ptownsin · Post by **ptownsin** » Thu Jul 06, 2006 4:36 am

Honda S2000 are 390cc I think (from memory) but Blackbird and Hayabusa are slightly bigger than the 750 ones if it's just a bit more poke you need. I got the info from here http://www.cbr1100xx.org/forums/lofiver ... t5760.html when I was looking at replacements but the 150hp I need is easily supplied by standard injectors as proven on the dyno

Paul.

Bow · Post by **Bow** » Thu Jul 06, 2006 9:01 am

Thanks Paul.

You think the stock GSX-R 750 injectors will support around 200hp and an engine redline of about 7200 rpm?

The 2002 GSX-R 750 was rated for around 140hp a 12,700 RPM.

MarkW · Post by **MarkW** » Thu Jul 06, 2006 9:15 am

750 injectors should see 200bhp easily

Don't foget because bikes rev so high theres more fuel flowing, the gsxr 600 that are rated at 30-40cc/min less are good for 180ish

Bow · Post by **Bow** » Thu Jul 06, 2006 9:18 am

Mark,

That is great news!

I have been beating myself silly looking for injectors and I didn't want to bore out the Throttle Body injector ports if at all possible.

my manifold is slowly coming together, and if the Stock GSX-R 750 injectors will work, I will save a nice chunk of change!

Bow · Post by **Bow** » Thu Jul 06, 2006 9:59 am

UPDATE:

I just got off the phone with RC Engineering.

I was told that all of the Suzuki Injectors, from the GSX-R 600 to the Hayabusa, flow about 240cc at 43psi.

He told me I could probably get away with the stock injectors by adding an adjustable regulator to up the pressure.

MarkW · Post by **MarkW** » Thu Jul 06, 2006 12:01 pm

thats good to know. I seen somewhere the 600's were 240 and the 750's 270 but obviously not the case

Bow · Post by **Bow** » Thu Jul 06, 2006 5:56 pm

yeah, but what I don't get is that the stock Nissan injectors used on my 2.4l are 270 cc and inject just in front of the valves...

so I have trouble seeing 240cc's working about 6 inches away from the valves, where the ITBs are located...

Know what I mean?