[fiver]

2003 F7 Standard. 75 miles on sled, 25 miles on belt. 160 pound driver, softest spring setting, coupler block on 1. 170 studs. 136 1.175 Woody's Traction Masters in the middle, 34 1.205 Chisel Tooth studs in the closed windows of 1" track. 1/2 mile glare ice. 50' roll out, then nail it. Fuel switch on ethonal mode 92 octane fuel in tank. Stock clutching 3600 engagement, 8060 shiftout. 1st run 112 mph. 2nd run 111 mph. D&D 3800 engage, 7820 shift. 1st run 111 mph. 2nd run 111 mph. Tighten secondary to 5th hole, RPM @ 7960. 1st run 111 mph. 2nd run 111 mph. Fuel switch to regular mode, down. Same D&D clutching, no changes made except to fuel switch. 1st run 113 mph. 2nd run 113 mph. Found belt going all the way to top of primary clutch. I believe this thing is out of gear in 1/2 mile glare ice. It won't go any faster. Gear sled way up to 24/39. 1st run 116 mph. 2nd run 115 mph. Shift rpm 7720. Belt 5/8" down on primary. Made changes to weights, springs, and helix. Don't think it will pull this gearing on the big end. 23/40 is probably the way to go like BYOFFCR has said. D&D clutching pulls hard at bottom and midrange. Should work well on trails for corner to corner bursts and short drags under 1/2 mile. Would like to see more rpm. They pull the motor for acceleration. It does that well!

 

[Super 8]

Did you try loosening the secondary on the stock clutching? This might surprise you in having the same results, just my .02.

 

[ods dan]

that thing was way over revving 7800 max..

 

[ods dan]

at least some of the time, I meant

 

[F-5 sno-pro]

Now do it with an f5

 

[byoffcr]

1 in track 1/2 mile on ice, 105 - 1.20 ice picks trying to dial in for radar runs.. Vf3 reeds,air box mod took +3 keyback out , lost top end, DP clutch kit same as on trail kit , geared 23/40 118 mph 3/4 miles 122- mph 7875 RPM 17degrees above this sled should really come alive at 10-15 below will lower our redar sled & make other changes I sure, but this is a good starting point for all u trail & lake runners . This is what wife & I will run for trail we have a 3 rd F7 for radar runs , 318 miles on motor of test sled Running Blue Marble oil These runs are made with 91 oct. in reg mode I can see 92 oct. in winter at this distance .--1000 ft runs I ll run 87-89 oct & see what happens I had mod stockers that wouldnt run with these sleds So dont give up guys Enjoy Remember this is just a trail set up with good back shift Dont know what we will do in 1000 with changes & no backshift Probley shaved track ect Timming changes for short runs 500- 660

 

[F7Hooligan]

Stock F7 with 1" track and 153 studs. 450 miles with 89 octane gas. 220# rider (me).109 in 3/4 mile. Could've squeaked a couple more mph out of her but I ran out of room. That's fast enough for me anyhow-all in all a very good Chrismas Eve ride.

 

[Goin' For Snow]

Nice report

 

[Goin' For Snow]

Originally posted by The Outdoor Shop@Dec 22 2002, 07:59 PM
that thing was way over revving 7800 max..

According to GLS, those r's are exactly what he described. Slight overrevs, up to 8100 on the long haul.
IMO, if its going to overrev, that would be the conditions for it. Glare ice,about the only drag are the melting hifax.

Pat