MCX Rx1 rear mount jetting question.

[MRFUSION]

Is anyone going richer than 135 main jets on their mcx rear mount. When I hammer the throttle from a standstill I go lean to over 13 on my a/f but if I release the throttle for a split second and hammer it again I gain major rpm and my a/f goes down to 12.4. Anyone seen this on a Mcx system. All jetting is stock except I am trying Hurricanes cv springs. Thanx for any help. Shad

 

[Ted Jannetty]

Is anyone going richer than 135 main jets on their mcx rear mount. When I hammer the throttle from a standstill I go lean to over 13 on my a/f but if I release the throttle for a split second and hammer it again I gain major rpm and my a/f goes down to 12.4. Anyone seen this on a Mcx system. All jetting is stock except I am trying Hurricanes cv springs. Thanx for any help. Shad

What year is the sled?

 

[rxrider]

That is what we have seen happening on our sleds, by going from stock springs to Hurricane's springs we went lean just as you say, almost exact #s. '03 RX-1 with MCX rear mount turbo.

 

[MRFUSION]

Thats what I was wondering too. I will go back to the stock springs and give that a try. By the way it is a 03 Rx1. Thanx for all the help guys. Shad

 

[Skydog]

Yea i tried like every spring under the sun. Stock was best on my Sled. 03 Rx1 rear mount Turbo.

Skydog

 

[rxrider]

Skydog - you were absolutely right about the springs, after doing the same all the springs there is routine (while the silver kinda worked) I found that the stockers were the best, and even better the stockers cut down 20 millimeters had better throttle response, but it is a band aid either way. Go with Hurricane turbo springs and be done with it, you may have to jet up. The turbo springs are as stiff as the stockers and a lot longer.

 

[TT]

That is what we have seen happening on our sleds, by going from stock springs to Hurricane's springs we went lean just as you say, almost exact #s. '03 RX-1 with MCX rear mount turbo.

But did they clear up the rich midle when boost builds on the MCX kit?

 

[rxrider]

Mine was rich up to 7000 rpms where it cleared out, it ran almost perfect AFRs from 7000 and up, so I would say I had a low end rich condition from take off to about 6000 rmps where boost started to build, at 7000 rpms it made 10 lbs and 16 lbs shortly after.