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From Doo talk-Mach rules

R

RX1 Yooper

TY 4 Stroke Junkie
Joined
Apr 14, 2003
Messages
540
Location
Marion, Michigan
the results are in :
i own a 03 zr 900 stock and unstudded(for now)

its my radar gun, a stalker pro that tests good with the tunning fork

we were out today aprox -10 to -12 celcius

05 900 108mph
03 900 114mph first run blew belt
03 900 114mph second run blew a second belt
05 f7 done up, i think with an f8 kit? 120mph
rx1 112mph
f7 107 mph
mach z 120.7 first run
mach z 122mph avg run
mach z 124.1mph best run of the day was later in the day, it seemed like the hotter it got the faster it ran consistent at the end of the day 123-124 mph
 

That was my RX-1. I ended up runing 114.5 at the end of the day. That Mach z stock only ran 112 but with minor clutching he was able to get 124 consistently.
 
Is yours stock? Tell us what you did to dial 'er in. Pretty respectable times.
 
I have ECP filters and stage 2 clutching. I ran 111mph my first run with engine reving at 10100 rpm. I took a .9 grams out of the tips of the HH and I ran 114.5 mph with engine rpm at 10,300. I fI had more time I probably could have brought the rpm up to 10,700 and gained a couple more mph. I also did some testing with my engine tensioner connected and then disconnected and found no difference in top end but when you punch the throttle with the tensioner connected the sled has much better throttle responce. My speedo was reading 132 on my last run.
 
That's good to know, as I have the exact same sled and setup. I had my sheaves machined though for overdrive. Did you by chance try the stock weights? I was surprised that the HHs were actually lighter than the stockers.
 
RX1 Yooper said:
I thought the RX had the widest power band in the industry. Why did 200 rpm make such a difference?
Click to expand...

Powerband has nothing to do with MPH when the clutches are approaching full shift 1:1.

By dropping .9 grams from the tip of the arm, that allowed the engine to increase RPMs by 200. If you calculate the FORCE IN LBS created by 200 RPM, it is greater than the FORCE created by the original cam arm weight @10100. Force increases by the square of the speed for a given mass.

This tells him that he is not generating enough force to "squeeze the clutch" against the resisting forces of the pressure spring in the primary and/or the spring in the secondary, and/or the chaincase gear ratio (ratio too high) for the HP of the engine. (HP not torque)

Power band has nothing to do with this scenerio.
 
jtssrx said:
MPH is equal to RPM at full shift. So if your clutched are at 1 to 1 then the higher your RPM is the Higher your MPH will be
Click to expand...

jtssrx-

This is correct but doesn't appear to apply to this situation because after he took tip weight off the RPMs came up. This tells me that the clutches were not yet at full shift ratio 1:1. If he ran farther on the later passes, that may account for the increase in MPH as well, if he was @ 1:1, I agree. If thats the case, I would expect the RPMs to drop on top (loose RPMs) until he reached 1:1, because the tip of the cam arm was a gram too heavy. He didn't say that happened, so I'm going on the info he gave.

Sounds like he needs a primary clutch spring with less tension on top, at least...
 
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