2005 RX-1

[Dukester]

LB! Great post. I feel the same way. We have three kits in our group and all three seem much snapper, BUT in actual runs against simular clutched sleds, in our group they really aren't noticeably faster. Maybe a sled length at the snap of the throttle.

I feel they are some times iritating to drive. When you go over large repeative swoops in the trail it is hard to hold the throttle steady enough to prevent surging and their snappy instant responce makes it even worse.

I know when you change the clutching, like has been sugested, the top end is slightly better but the rpm is 10500 to 10700 which in my opinion is too high for high mile trail use.

 

[LazyBastard]

That extra length can probably be attributed to the 2 extra on-top ponies that the kit *does* provide.

 

[QCRider]

That extra length can probably be attributed to the 2 extra on-top ponies that the kit *does* provide.

Is it that or is it that the motor spins up to peak quicker (albeit fractions of a second quicker) due to less restrictive intake at WOT, therefore the ECP sled gets a split second advantage?

In theory, I do agree with what you are saying, but in practice the ECP sleds have been reported to be quicker to top speed. By the way, I am not ruling out the "Playing Cards in your bicycle spokes" effect here. I know my bike was DEFINITELY faster with those cards in there when I was a kid! It must have been faster, right? I mean it SOUNDED so fast!

I think the truth is that the ECP kit does help the sled spin the motor up a little quicker, but the sound adds to the experience.

JMHO

 

[STAIN]

so you are saying the ecp kit affects throttle response and not power? Regardless I am still strongly considering one, any advantage is still an advantage right?

 

[LazyBastard]

You should probably think about what the "Duke" said... that its too sensitive to the throttle at lower speeds with the ECP kit, which is exactly predicted by the theory I came up with. There are better ways to come up with the difference than by screwing with the way it reacts to throttle - ie, increase traction, lower gearing - ideally, lower gearing with overdrive clutching, that would rock.

 

[Boston RX1]

LB, could you give us more detail in your last post, "ie, increase traction, lower gearing - ideally, lower gearing with overdrive clutching, that would rock". I can figure out the traction part, but the gearing and overdrive clutching has got me curious. Thanks.

 

[LazyBastard]

Well, the primary clutch on RX1 doesn't close all the way. An overdrive clutch will have its faces ground slightly to force the belt to ride up to the top, which means less motor spins per track movement. Dropping the gearing (change the gears in the chaincase) will have the opposite effect. Since overdrive clutching won't change the bottom, the lower gearing will take off harder, but the overdrive clutching will get the effective gearing back to where it started so that it won't loose top end.

 

[Boston RX1]

This is exactly what is happening to my sled. I have it geared down and have lost top end. Is this something that can be purchased or is this a mod I have to do? If I have to do or have it done, what do I need to know on how to do it?

 

[LazyBastard]

You can buy overdrive primary from mcbperformance.com for $129. Claimed 5 mph. cbperformanceparts.com for $119.

 

[Mighty]

This is all kind of crazy, forget that it only sounds quicker, it is quicker. The kit works plain and simple!

I ran my Warrior with and without the kit. With the kit I get the jump on my buddies machZ, without the kit he gets the jump. With the kit I stay in front of him after getting the jump. Without the kit I never catch him after he gets the jump. We ran in every possible condition you can imagine and the results were always the same. Can I draw this picture any clearer

I'm still stock clutched to boot :shock:

 

[LazyBastard]

Its because you are still stock clutched! It jumps only to 9300ish rpm out of the hole and pulls up from there. If you had it hitting 1000 rpm higher, you would get a WAY BIGGER jump out of the hole, and you would find your filter kit to be somewhat useless.

It helps a BAD SETUP to be not quite so bad.

 

[SUPERTUNER]

You should probably think about what the "Duke" said... that its too sensitive to the throttle at lower speeds with the ECP kit, which is exactly predicted by the theory I came up with.

Firstly, I cannot believe someone is actually complaining that the throttle response is too good! (insert icon of SUPERTUNER shaking his head here) I know!!!...I am going to design a kit that slows down the rate of acceleration of your engine! Then all you armchair engineers could have something "real" to complain about.

In the latter part of LB's response he admits that his statements are only "predicted theory". At least he is honest and tells you all that he has no real world testing of the product. Opinions are like a$$holes...everyone has one. Only problem is, my testing both on dyno and in field are grounded with serious technical backup and it is quite clear to me that LB and most folks really don't understand CV carburetors very well.

LB...I am not slamming you and I admire good thinkers but sometimes it is better to think the whole thing through and conduct some testing to offer some real technical help...not conjecture.

"Sometimes it is better to remain silent and be thought of as a fool than to opens ones mouth and remove all doubt."

Now to add some real serious proven technical input to this post and this is a poll... How many of you think that just because you have 10 RX1's in a row that all have the same time on the engine and all stock clutching that each and everyone will run exactly the same?

Isn't it reasonable to think that one is going to be the fastest? Not in LB's world. But thanks for the input.

Freddie

 

[Mighty]

So what you are saying (LB) is that getting more air into the engine doesn't help at all? I'm really glad to hear that cause now I can take off my open filiment breather off my vette because it gets dirty too quick and doesn't really help

I wonder if dumb #*$&@'s with blowers sticking out of their hood realize they don't need that either, just a simple air cleaner housing off a 74 nova with the 1 1/2 inch snorkle will do

 

[QCRider]

This is all kind of crazy, forget that it only sounds quicker, it is quicker. The kit works plain and simple!

Mighty, read closely, I actually agree that the kit would be quicker. My point about sound is that it ADDS to the experience.

 

[SUPERTUNER]

I wonder if dumb #*$&@'s with blowers sticking out of their hood realize they don't need that either, just a simple air cleaner housing off a 74 nova with the 1 1/2 inch snorkle will do

Yea...imagine that! Dick Lahaie, Kenny Bernstein, Kaliita, Force, Prudhomme and all the other NHRA Tof Fuel and Funny car racers have been wrong all this time. I can;t wait to get on the Top Fuel message board and poke fun at them!

Unbelievable.