RPM Fade Suggestions

[kfa670]

I have fought RPM fade with my 12' XP since even before I put the turbo on. It refuses to run around 7900 rpm. It will hit 79-8000 and runs awesome and then fades back to 76-7700 on a long pull. Here is what I have:

Aerocharger @ 10psi
Straight AV gas

200/290 primary spring with about 22 grams maybe 23 I can't remember, 1mm oversized roller, DJ's mountain ramps, clicker 5

XP purple 231/300 secondary spring
NC-D2 helix

21:51 gear


Basically I can hit 79-8000 on the initial stab but it always fades back. Just curious if anyone has any tricks to get the clutching a little more consistent. I added a small amount of weight to the primary this year to keep it from over revving in clicker 4 but now most likely will take that back out. What I'm wondering is how to battle the "fade". I'm wondering if things are just starting to wear out and need a rebuild (clutches, reeds maybe too but it starts and idles fine)... I probably have about 2000 miles on the sled.

Thanks for any suggestions

 

[Wheel House Motorsports]

If it has always done this, slightly more finish rate on your secondary spring should help it hold rpm as you shift out.

 

[Dynamo^Joe]

Pg 76 Aaen tuning handbook #2007
More engine speed towards top end
Go from the 200/290 to a 200/230.

Raising the final force of the primary spring from xxx/290 to xxx/320 will increase the pounds by about 13 at midrange tracks speeds.

2012 800e's had poor stators that would fail the stator voltage test when heated up.
I did testing on a 154 to where i had the recoil off and put a heat gun on the magneto and as the stator heated up, my fluke multimeter showed diminishing voltage below 15.
I had buddy crank the engine over by a rope on the clutch.

Low voltage, low power to everything including injectors. I would be looking at your AFR gage when the engine speed starts to drop and see if the values are increasing over 12.8~13.0

 

[kfa670]

Thanks for your input Joe! Have a lot of miles on your clutch kit it has worked really well.

And wouldn't you know it, my original stator went out last year so there is a new one in it now. I will look at AFR close next time.

I have a 320 spring. Try that first? Or go with secondary first