|By Scottaride on Sunday, December 22, 2002 - 08:23 pm:|
I recently purchased a set of the shorter SP type Velocity Stacks and have been doing some comparisons. Here is what I've found.
(For your information; I have a 01/02 RSV with Renegade Duel Hi mount slipons with +02 chip, an Evo race air kit, PC111 with a custom map that was made with the SP velocity stacks in place, and the airbox intake from the 2000 model RSV.)
Anyway, the PC111 fixed my 3000-5000 flat spot and it was mapped with the SP stacks. Then I did before and after Dynos with the SP and then the standard velocity stacks in place. It showed there is not much difference between them on the dyno. The SP stacks made 1 hp more in top end and made 1-2 hp less from 3000-7000 rpm, which doesn't seem like much of the difference.
However things were quite different in the real world and the SP stacks felt like they made 5-10 hp less in the midrange. Out on the road the STANDARD velocity stacks were considerably stronger in the mid range, yet they didn't appear to lose out at all in top end compared to the SP stacks.
Rather than simply doing a seat of the the pants test, I did a number of side by side comparison roll-ons with a friend on his CBR1100 Blackbird. We have bike to bike intercoms so it is very easy to get the timing perfect for the roll-ons. These roll ons were done in 4th,5th, and 6th gear at varying revs.
With the SP velocity stacks in place the Blackbird would immediately get a slight jump ahead (about a bike length) in all gears and at any revs between 3000-7000. And he would steadily and consistently pull away from me. Basicly he kicked my butt.
With the standard velocity stacks back in place the positions reversed and the RSV would actually pull slightly ahead of the Blackbird. (Much to his disgust ) This was most evident when we were at lower revs (3000-5000) and if we begun the roll on at 5500-7000 the two bikes would basically remain side by side. In 6th gear roll ons the RSV would be slightly ahead from 100-175kph, and then once we reached 175kph the Blackbird would immediately (and strongly) begin pulling away (as it hit its main power band).
We tried a few roll ons at 7000 and 8000 rpm but couldn't really decided if the SP stacks had given any improvement in the top end in the real world, but at these revs the Blackbird kicked my butt.
The effect of the SP velocity stacks might possibly be noticeable on the racetrack, but in the real world I personally would be sticking with the standard velocity stacks. This is obviously just my personal opinion based on my experience with my bike and it's set up, but I was warned by Jorge at Renegade that purchasing the SP velocity stacks was a waste of time. Maybe I should have listened to him.
I hope this info helps and dont hesitate to give your personal comments or experiences (As if you guys ever hold back)
PS: I fell off on the weekend. Bugger!
|By Powermaster on Monday, December 23, 2002 - 12:57 pm:|
oH dEAR tHE velocity stacks I mean
~BTW I am meteaing our Sevilklian poster Friday.
|By Powermaster on Monday, December 23, 2002 - 12:59 pm:|
I just my duke
|By Powermaster on Monday, December 23, 2002 - 01:03 pm:|
I just my duke
|By Scottaride on Tuesday, January 07, 2003 - 05:12 am:|
Anyone want to buy some cheap (As new) SP Velocity stacks?????
|By Crmc33 on Tuesday, January 07, 2003 - 07:46 am:|
No tar, Ive already got some egg cups
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