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guess I’ve been watching too many amateur vids on here lately, nice to see someone neither sawing the steering wheel back & forth nor sliding around, great job there bud 👍
Originally Posted by trackjunkie
(Post 4883923)
i had my first track event last weekend with the new clutch setup. the clutch felt amazing on track. shift was lightning quick and effortless. can feel the synchro doesnt have to work very hard, with the low inertia of the small disks. also probably because the rpm drop so fast that synchro doesnt have to do much to match the speed of the disk to the engine. getting the car moving from a stop is a pain. have to rev it up pretty high and ease off the clutch or it will stall. idle is also not very stable sometimes. i did drive it on the street for about 300 miles to break in the clutch and and final drive. definitely not DD friendly. getting on the trailer is not as bad as i thought. i pull the car up the ramp to line it up. then back up about 5 feet and get a running start up the ramp. didn't have to slip the clutch much. if you're car is primarily a track car, i would highly recommend this setup. it would probably make the tranny last longer also.
my tranny was grinding going into 5th at the last event last year. and i never had to use 6th on track. with the new clutch setup, i can bang into 5th without any issues. and getting into 6th is a breeze also, which i have to do a lot now with the 5.1 FD. here's a short vid from last weekend. https://www.youtube.com/watch?v=8-22uHZntPU |
Originally Posted by TeamRX8
(Post 4914826)
guess I’ve been watching too many amateur vids on here lately, nice to see someone neither sawing the steering wheel back & forth nor sliding around, great job there bud 👍
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Just posting this here. For anyone looking for a flywheel with some additional MOI over the superlight Mazdatrix aluminum flywheel for improved launching and low speed drivability, there’s a company in England that offers chromoly race flywheels for the RX8.
The Mazdatrix aluminum 7.25” flywheel weighs a crazy 2 kg. The chromoly one offered overseas is 3.4 kg and the starter teeth are integrally machined from the same piece of billet chromoly material rather than a separate ring gear attached to it. https://cimg2.ibsrv.net/gimg/www.rx8...a8255453f.jpeg Chromoly flywheel for 7.25” race clutch I’m waiting on the 5.5” info and will post it later. They also have an 8.5” and OE clutch version too. |
nice find
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sooooo ... those guys never got back to me, which is understandable as the UK has even more issues going on over there than we do here, but Mazdatrix finally did get back to me. They can have a steel version made from 9.5 lbs. - 22.0 lbs; $750 with welded stock starter-ring gear, $900 with an integral ring gear
but I decided to instead upgrade the 5.5” clutch to a 3-disc for some additional MOI that it and the longer mounting bolts provide. It also has 90% of the surface area of a 2-disc 7.25” clutch for longer wear durability, but without adding too much weight/inertia of the larger clutch. . |
that's too bad, the chromoly flywheel did look like a very quality piece.
i did clutch dump the car a couple times last weekend at the rack. where they put us on in hot grid was slightly up hill. so when they send us out, i kept stalling if i try to take off normally with low rpm and slightly slipping the clutch. i just rev up to around 4-5k and dump the clutch. it wasn't to launch the car but just to break the tire lose and not have to slip the clutch or stall. i'm also only running 245 R7 tires, but if you run wider A7 tires and try to launch in a way that it would hook up, then that's a different story. |
that’s pretty much SOP
since I’m not planning to run steamroller tires/wheels, then not having that extra 30- 35 lbs of rotational weight along with lower effective gearing is going to help as long as there’s some wheel spin off the line, then high rpm launching is nothing new for me :) . |
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