Testing with TD GPS/Dragy

[ROCKERDAN]

In the next few days I have some more testing planned.

I have a 35/39 dalton reverse angle to test (I ran this last year).
I have a dalton 41/35 that should be here tomorrow morning.
I have the full ulmer stage 2 kit I will test also.
If I'm really up to it I may throw the stock 21 tooth back in to see if I get up to speed quicker.

I can see where the 35/39 may help with the top over rev....I know some were running it last yr. Keep us posted on that. I think if your running less then 16.5psi there is a big difference where you clutch things.

41/35 is gonna need a really big early spool tune or it will be poochy down low with that steep start angle.

I wish I could do quick back to back runs with 21 vs my 22.....such a pain to change them out fast though.

Dan

 

[DMCTurbo]

Ok tested the 35/39 Dalton reverse helix this morning. This was the only change, same 6-1 wrap.
I did a baseline run to get a good comparison, same day/same condition.
Dalton black/teal primary spring
Dalton dtya1s with 1.3 gr slug
Dalton black orange secondary at 6-1
Stock helix
22/41 gearing
Stock 1.25 with 192 dull Megabites.

660'. 100.3 mph
1000'. 111.5 mph
1320'. 116.4 mph
2000'. 121.7 mph

35/39 helix, all else the same.
660'. 101.8 mph
1000'. 112.2 mph
1320'. 117.1 mph
2000'. 122.4


Now I'm going to install Ulmers full kit and head back to the lake.

 

[ROCKERDAN]

Ok tested the 35/39 Dalton reverse helix this morning. This was the only change, same 6-1 wrap.

I did a baseline with what I ran yesterday first as its a little cooler today. Same track conditions.
660'. 100.3 mph
1000'. 111.5 mph
1320'. 116.4 mph
2000'. 121.7 mph

35/39 helix, all else the same.
660'. 101.8 mph
1000'. 112.2 mph
1320'. 117.1 mph
2000'. 122.4


Now I'm going to install Ulmers full kit and head back to the lake.

 

[DMCTurbo]

What setup for first run? be best to put your entire setup when testing into notes.

thnx
Dan

Edited my post

 

[ROCKERDAN]

So what do your rpms do with reverse angle vs the stock helix?

Are the revving less on top?(I would think so)

top rpms stock vs top rpms with reverse?

thx
Dan

 

[Lusemeat924]

What does the Ulmer kit consist of? Helix angles? Spring rates?

 

[ClutchMaster]

I can see where the 35/39 may help with the top over rev....I know some were running it last yr. Keep us posted on that. I think if your running less then 16.5psi there is a big difference where you clutch things.

41/35 is gonna need a really big early spool tune or it will be poochy down low with that steep start angle.

I wish I could do quick back to back runs with 21 vs my 22.....such a pain to change them out fast though.

Dan

Dan,
I think you will find gearing back down will get you literally nothing as far as acceleration goes.
I had some proof of this just last weekend. I rode with two Cat F1100 guys both tuned D&D PT 240hp. One Cat had stock gearing the other actually had increased gear reduction, this was recommended by AC to help with the belt destruction issues.
I was running 13.5~14psi so not much difference in hp than those cats. My gearing however is extremely high 24t top, 41t bottom. From a rolling start about 20mph it was pretty even all three sleds to about 75mph, then both cats fell off quickly. We repeated this race a couple times throughout the day with same results. Conditions were about average and we all have studs.
Funny thing is the Cat with the highest gear ratio never really jumped us off the line at all, but was certainly the first to fall off at speeds over 80mph.
Here’s my theory, if you can’t put the power to the ground (traction) with the gearing you currently have, how is putting more track torque down low gonna help matters?
Even with my huge top end gearing I still have little traction below 50~60 mph.
Sidewinder has decent gearing for stock tune, but add 60~80hp and it’s way over geared. M2C

PS
those cat guys running PT couldn’t believe I was running a pump gas tune (I actually was under boosting should have been 15psi) I gapped them by a football field in a little over a mile.

 

[DMCTurbo]

So what do your rpms do with reverse angle vs the stock helix?

Are the revving less on top?(I would think so)

top rpms stock vs top rpms with reverse?

thx
Dan

With the 35/39 it pulled my rpm down to 8850-8950.

I removed the 1.3 gram slug to bring my rpm up 100 or so rpm but my speeds went down slightly.

 

[DMCTurbo]

What does the Ulmer kit consist of? Helix angles? Spring rates?

Ulmer pink spring 30/90(not sure how he measures this because it's a lot stiffer than that I believe)
STM 60ys weights
STM 42-36 helix (I again believe these are measured different and I think compared to Yamaha angles this is more like a 48-40, just my opinion)
Red cat secondary spring

 

[DMCTurbo]

Ulmers kit
STM 60ys heel empty, mid empty, 2 tungsten and 4 washers in the tip.
Ulmer pink primary spring.
STM 42-36 helix
Cat red secondary spring at 9-1

660'. 99.6 mph
1000'. 111.3 mph
1320'. 116.5 mph
2000'. 121.5 mph

Clutches were cool and clean.
Rpms steady around 8900. Seen 9000 on launch probably due to spinning.

 

[DMCTurbo]

My Dalton 41-35 helix just came in.

The first picture shows the stock helix (on the left) next to the STM 42-36.

The second picture shows the stock helix next to the Dalton 41-35.

To me the STM is way steeper than the Dalton. They should compare very similar when backed up next to the stock helix.

 

[DMCTurbo]

Just an FYI

This same track I'm testing on when plowed down to bare ice I would consistently run 124-125 in 2000'. Just goes to show what resistance an inch or 2 of snow causes. I think with a 1 inch track and better studs I'd be pretty close to getting into the 130 club on the bare ice.

 

[Lusemeat924]

Ulmers kit
STM 60ys heel empty, mid empty, 2 tungsten and 4 washers in the tip.
Ulmer pink primary spring.
STM 42-36 helix
Cat red secondary spring at 9-1

660'. 99.6 mph
1000'. 111.3 mph
1320'. 116.5 mph
2000'. 121.5 mph

Clutches were cool and clean.
Rpms steady around 8900. Seen 9000 on launch probably due to spinning.

Are you seeing much difference between the different secondary springs? Im going to try the cat red today hopefully.

 

[ClutchMaster]

Are you seeing much difference between the different secondary springs? Im going to try the cat red today hopefully.

What helix?

 

[Never Satisfied]

Can you overlay ET's? Not sure 1 MPH means much. Also, if it is faster at 88-8900 that's where I'd run it.