srx clutch guru's

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turbor

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Mar 21, 2007
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mirabel,qc
ok, i've got a question for you guys, ive got 40-10 h/c's red spring 5.8g heel, 8g tip (mrviper ported motor) 51-37helix, green spring. I did a setup last week with 7g tip, when i snapped, rpms went to 8600-8700 sometimes and stayed there. green spring was at 60. raced my buddys atttack on soft snow, always got him by a lenght up to 100mph. Now i added 1gram more to lower the rpm's and it killed the machine, i had to go up to 80 to get some rpms back up and control the shift, anything under 80 and it overshifts . Now with this setup it goes to 8300rpms and slowly climbs to 8400-8500, i tought that should be perfect, but you can feel the machine lost its snap, and i raced the atack again, and now on harder snow, and he his killing me now, he pulls away now. what gives, it was overevving and was way faster than now that its itting peak rpms, anybody can explain this too me? trying to understand! damm atttacks theyre fast!
 

Here is something to try
5 grams heel
3.2 gram bolt inner & tip
Green secondary spring at 80 wrap.

or

Tighten your secondary 10-20 degrees with the 1st set up. Your probably slipping the belt in the secondary.
 
turk can you explain why my second setup with the rpms pretty dead on is way slower than my first tho. first setup even tho its slipping the belt in the seconday a little (thats what i tought also) is way faster than setup 2, that what i dont understand. Turk, mr viper suggest to never put anything in the center hole for an srx, and you do, care to explain? I'm open minded and more than willing to try, hell as long as its fast lol, i really enjoy reading on this site and LEARNING! I think i have taken my clutches apart like 10 times in the last few days, today my buddys stock 02 srx witch i was spanking big time with setup 1 last week was only one machine behind my ported 01, you can imagine how i got teased all day, not fun #$%&*

also adding more heel weight, i know lowers engagement, but does it change after also, i was at 5.3 with setup 1 and 5.8 with setup 2 Thanks!

also im using the stock 01 srx rollers is that ok?
 
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heel weight will effect the mid range and topend rpm to some extent but it effects the response of the engine more, this is where your probally getting a zip taken out of the engine, try and lighten up the heel a little bit.

The thing with tuning is to keep notes on set ups, this way you can see exactly which way is worjking vs not working, if you slow it down then just go back to what you had before, everyone slows them down when tuning, its normal, then you can go back and fine tune with very small increments to find the sweet spot.
 
Put it back

If you left it alone with the 7 grams in the tip you may have found that it was dead on RPM wise with the added traction. The softer snow and spinning may be what was causing the over rev when you raced him the first time. Just a thought.

Madmatt
 
thanks guys i put 7g back in and put the grren spring at 70 (was at 60 before with that setup) going to go and test later today
 
well i think i'm dead on now or very close, went to my test strip, with 6.75g exactly in tip 4.8 in heel,green spring at 70wrap. From a Dead stop, i goes to 8400-8500 and at about 70mph starts to climb to 8600, i saw up to 8700 but didnt have the time to look at the mph, had to stop lol. Now i need to retest with the same atttack that will tell me if i gained or lost lol. Also the snow was pretty loose, will it change my setup alot when the snow is hardpack? Thanks guys, im trying to get ready we have alot of races over here every tuesday nights, i want to go spank some f7's and attacks and apex's hehehe
 
ok, i will wait until its harpack to test some more. I think thats what got me all lost, beginning of season whe had 2 major big snow storm, so there was LOTS of snow but it was LOOSE snow, no hard base at all, and i was out tuning my setup, adding weight everytime i went out. suddenly it rained, then got colder, we got a hard base and bam all of the sudden i was undereving big time. when its hard out i want to test the green spring at 60, its now at 70 and controlling the shift perfectly, so i want to see if i can get away with 60
 
me to!!!!

Mine seems to the same way.At launch rpm's go to 8400,may drop slightly when it grabs and then climbs to 8500 dead on.Still dealing with soft snow.I have 8 grams in tip and I think 6-7 g in the heel.Getting a brand new gram scale,should off been here by now from E-bay.Then I can really weigh things exactly and fine tune.
 
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to you to blue! and to all the nice pleople on this site!

I feel dumb now but happy in another way. I had a little free time this morning, decided to clean my p/v'S guess what, i found the culprit, there was one pulled....... now i know why the attack was killing me and my sled felt slow... when i put i back together,i changed 2 p/v's the third one the previous owner had repaired i dunno how, it looked glued, anyhow thats the one that failed. Now what pisses me off, im sure my clutching is going to be off again? RPMS will go up no? I had about 700miles now on the p/v's At about how many miles do you guys clean them? i tought 600 should be more than ok, well they where really gummed. I'm using motul shyntetic oil. Im going to try and find some amsoil next time.
 
well yep the culprit was the p/w, changed it, cleaned the 2 others, checked adjustments, went back for a ride and the overevinng i was having with this setup came back, but so did the arm ripping power! :2strokes: when i zap it it goes to 8600 and then slowly climbs to 8700-8800-sometimes 8900. the snow was still loose, around how mutch will hardpack lower the rpms? i was going to put 1gram more on the tip, but im affraid if i do so it might be underevving when it will be hard pack, what do you guys think?
 
My experience has been the opposite. In the loose stuff, the track can't grab traction and spins violently, and the torque feedback thru the track into the helix is not enough to stop the primary weights from shifting out prematurely. Hard pack, or put differently, good traction, creates tons of load on the drive train and hence big torque feedback thru the helix. This effectively 'holds' the clutching in a lower gear and gives higher rpm. My setup is 40/10 HCs with no heel weight, 6 grams in the center, no tip weight, and the gray spring. Loose snow gives 4000 rpm launch, 8000 in the middle and 8300 as it settles in.
 
also another question, my track is 1" hacksaw, i ordered 96 woodys goldigger stud that will be here any day now, 1.175 in lenght, that will change my rpm, wont it, also the track will be heavier making me loose some power no? so might be bang on the way i am, maybe i should wait until i get the studs on the track before i add some more weight?
 
studs will slow ya down to a certain extent, but i dont think 96 would take a whole lot off. I ran 144 last year on the stock track and could still pull 113 mph in a radar run. To me though its not about the top end, i want a really good hole shot so it all depends on what ya want
 
no i didnt mean slow me down on top speed, i meant putting studs in the track is going to add rotating weight, thus making me loose some hp, so making me loose some rpms? am i right?
 
hardpack or wet snow will pull it down a little but you need more weight yet, 87-8900rpm is way,way too much
 
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