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Old 06-17-2015, 10:23 PM
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I'm convinced so I've got a set of 8x1.3mm pistons on order for my TKI3. Can't wait to try them out.
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Old 06-18-2015, 07:43 AM
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Depending on your track I would give the 5x1.5 a try with orange springs. I put mine on last week and man the car was hooked up. Right spads
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Old 06-21-2015, 09:18 PM
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I am very impressed with these in my tekno sl48 on 4s ran my regular pistons first then these I gained a lap car was just planted way more traction.I am getting set for my b5m now for sure.
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Old 08-27-2015, 10:57 AM
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Is VRP out of town or something? I ordered a set of pistons last week and have gotten no confirmation/tracking, or replies to my emails.
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Old 08-27-2015, 05:24 PM
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Originally Posted by inpuressa View Post
Is VRP out of town or something? I ordered a set of pistons last week and have gotten no confirmation/tracking, or replies to my emails.
Hi, could u pm me yr order details? I will ask someone to check it up for u.
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Old 08-27-2015, 05:50 PM
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Originally Posted by adrictan View Post
Hi, could u pm me yr order details? I will ask someone to check it up for u.
PM sent thanks
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Old 08-28-2015, 12:27 AM
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Need a little help regarding # of holes and size of holes. The formula for computing Area is A=3.1416(pi) x radius squared. A piston of 8x1.2=9.04 and 6x1.4=9.23. As you can see, both are not far off in terms of total 'hole' area and if I were to use the same oils on both shock setups they would probably feel the same on the bench.
The question then is when would it be best to use 8,6,5 holes? Is it a question of track bumpiness? Or big jumps that need more pack?
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Old 08-28-2015, 04:34 AM
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Let me try to explain according to the setup guides.

A larger piston hole is better for rough track handling
A smaller piston hole is better for smooth track handling.

Smaller piston holes have more pack, less chance of bottoming out.
Larger piston holes have less pack, more grip and stable over bumpy surfaces.

Smaller hole pistons require lighter oil and have slower weight transfer, less responsive, and will land large jumps better.
Larger hole pistons require heavier oil and have more weight transfer, increase transfer, more responsive, and absorb bumps better.
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Old 08-29-2015, 04:02 AM
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Ran the 6 x 1.3 VRP Pistons in our Mugen MBX 7R today..... very happy with them

Cheers

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Old 08-29-2015, 03:58 PM
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How about # of holes - when would it be best to go 8,6,5? On my mp9, I've almost always used 8 x 1.3 or 8 x 1.2 if I needed more pack, but on the rc8b3 I see setup sheets that use 6 x 1.3 and 8 x 1.2 or 1.3. Ive also seen Ty Tessman use 5x 1.5 on his kit.
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Old 09-02-2015, 10:44 PM
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The XRay guide has further explanations.
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Old 09-03-2015, 10:21 AM
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Originally Posted by rfy View Post
How about # of holes - when would it be best to go 8,6,5? On my mp9, I've almost always used 8 x 1.3 or 8 x 1.2 if I needed more pack, but on the rc8b3 I see setup sheets that use 6 x 1.3 and 8 x 1.2 or 1.3. Ive also seen Ty Tessman use 5x 1.5 on his kit.
Don't forget flat vs tapered also. Actually, the compression rate is different between them due to the fact that the tapered piston is thinner (less surface area). This equates to less pack. That's why VRP's tapered pistons don't look so, but instead, thins out the piston so it will mimic the compression rate of tapered ones. Rebound is controlled by their unique design.

Source:
Originally Posted by icecyc1 View Post
My results from a shock dyno show very little if any effects from a tapered piston... it depends if it's a tapered piston (no effects) or tapered hole (some effect depending on design).

The concept that is marketed is that the piston provides a different rate of damping in compression as compared to rebound. On a dyno, this would create a higher/lower force on the the top half compared to the bottom half. This was clearly shown with a valved piston. It was also shown with CSI pistons (tapered holes plus tapered piston). It was not as evident with a basic tapered hole piston.

What is consistent, given the same hole size (say 6 x 1.3) for a flat piston, and compared to the "same" (6 x 1.3) tapered hole piston, the tapered hole will have less damping in both compression and rebound than the flat piston (with the same viscosity oil). So, this could appear to give the illusion of "faster" due to the taper, but you really changed the entire shock to behave as if it has lighter oil with no significant C:R ratio effects.

Here's a link to the presentation where I show the results. My signature is the link to the site where the presentation resides for more shock dyno data.
https://drive.google.com/file/d/0B-9...BXMzI4SE0/view

cheers

Last edited by inpuressa; 09-04-2015 at 10:27 AM.
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Old 09-03-2015, 09:40 PM
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Can someone please post a link to their website as i cant seem to find to. Cheers.
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Old 09-04-2015, 02:51 AM
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http://www.visionracingproducts.com
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Old 09-04-2015, 06:54 AM
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Amain is now carrying VRP products as well.
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