Blyton 19th Sept

[jeffw]

OK....makes sense. Still a nice run.

[AdamR]

Haha, yeah I realised that after I'd finished uploading the vid, really couldn't be bothered to correct it... Watching it back annoys me cos of all the mistakes, so tried to keep away from it!

It's amazing how crap the 888s are when cold compared with sprint tyres. A full 'flying' lap (warm tyres) was faster than the shortened standing start lap (cold tyres) even though you're travelling significantly less distance, which surprised me. Turns out the used slicks were marginally slower than 888s too, which I always suspected but had nothing concrete to base that on.

Also didn't realise how difficult it would be to get the car off the line cleanly with the lack of inertia in the engine and open diff, takes what feels like an age to hook up. Still, gives plenty of stuff to tinker with

Shame about your footage Adi, just means you'll have to go again

[jeffw]

I have to say my mind was boggled when you said 61 secs and I had to check the footage. The fastest I've seen a kitcar going round the sprint circuit was 65 sec (the outright lap record is 54 secs by a F1 engine Gould) so when you said 61secs

Avon ZZR sprint tyres make a big difference (about a sec). My best ever was a 66.5 sec run, there is more to come though through Bishops and Port Froid for me. If you watch the quick guys they are much faster than I am through Bishops and don't lift at Port Froid.

[adithorp]

Some good news from Danny Keenen at MK, I'm unlikely to have damaged anything but the starter motor (so not the sprag gear) as he's never seen a BEC do anything else. Easy swap once I get the throttles off for access and I have a spare on my old motor.

Adam, those mistakes on your run are hardly noticable... well not compared to my first one... that wouldn't have looked out of place at a drift event!
Would be interesting to try it again with another degree of rear camber and some good tyres just for a bit of closure. Sure there's a couple of seconds to be had

Jeff, I tried PontFroid without lifting a couple of years ago. Still dizzy from a +90mph 720 spin! Was about 100m down the concrete apron when I stopped... passenger wasn't impressed!

[jeffw]

Would be interesting to try it again with another degree of rear camber and some good tyres just for a bit of closure. Sure there's a couple of seconds to be had

I'll make a sprinter of you yet

[jeffw]

This is interesting

https://www.youtube.com/watch?v=h58xqQ3C3_E

Barry is very quick (64.67 run) but it never occurred to me to go as far off the track as he has.....need to re-think my lines !

[AdamR]

Haha, sorry Jeff, that was my fault for being a numpty

Not lifting through Port Froid... wow, you'd need a serious lack of power or loads of downforce for that I think! It's doable in a Mk1 MX-5 but didn't feel anywhere near on Saturday. Cornering speed was about 95-96mph (GPS) for me and from the data it doesn't look like there's much at all left in the car to increase that speed. So, I don't fancy trying like Adi did

Good news about the starter Adi - your drifting sounds mega too, really wish the video had worked!

Been playing around with http://www.vsusp.com this morning and there is something very weird going on with my car regarding roll centre migration at the front. It certainly helps to explain how it feels on track (awful ) and why Procomp recommended the springs rates they did, despite them giving sky high wheel frequencies. Lots of tinkering to be done over winter...

[pigeondave]

@AdamR

Is that a link to your suspension geometry or the general startup window.

Tim Hovered also looked in to the Fury's suspension but never took it any further, but it was a race chassis.(yes it was a few years ago, no im not a weirdo who trawls the web looking for all things Fury related)

http://hoverd.org/Tim/suspension-of-disbelief/

Also if you hunt about, one of the guys here have done a wheel rate calculator that might be of use.

http://www.neileverett.madasafish.com/m ... ampers.htm

and look for the spreadsheet on the above page if the below link doesnt work
http://www.neileverett.madasafish.com/d ... eights.xls

Also dont forget to check the bump steer if youre on sierra uprights. they'll go toe out in bump (Adi can confirm?) unless you sort it.

[AdamR]

Thanks for the links Dave! I have seen the wheel rate calculator before (then went on to do my own), but the rest are new, will be having a read through later.

Bump steer - yes, I investigated that recently. It was terrible!

This is a before:



25mm Bump: Right wheel toes in by 20 minutes, left wheel toes out by 6 minutes - total steer 26 minutes to the left.
25mm Droop: Right wheel toes out by 28 minutes, left wheel toes in by 10 minutes - total steer 38 minutes to the right.

Got it to this with a small amount of work (one 3/16" shim under the rack on the driver's side):



Bump: Right wheel toes out by 4 minutes, left wheel toes out by 6 minutes - total steer 2 minutes (as both in the same direction).
Droop: Right wheel toes out by 9 minutes, left wheel toes in by 10 minutes - total steer 19 minutes to the right.

But since then I've fitted some solid rack clamps, so it will need re-investigating. Ideally I would like a smidge of toe out on bump to help the car turn in, but we shall see if that's doable without unrealistic amounts of tweaking!


My current geo is here: http://vsusp.com/?tool=2d#0.8%26project_name%3AFisher%20Fury%20Target%26trim%7Bbody_roll_angle%3A0%7Cfront.left_bump%3A0%7Crear.left_bump%3A0%7Cfront.right_bump%3A0%7Crear.right_bump%3A0%7D%26front%7Bframe.susp_type%3A0%7Cframe.bottom_y%3A12500%7Cframe.center_to_upper_mount_x%3A31000%7Cframe.bottom_to_upper_mount_y%3A27500%7Cframe.center_to_lower_mount_x%3A29500%7Cframe.bottom_to_lower_mount_y%3A5700%7Ccontrol_arms.upper_length%3A19500%7Ccontrol_arms.lower_length%3A25980%7Cknuckles.hub_to_upper_x%3A13800%7Cknuckles.hub_to_lower_x%3A10200%7Cknuckles.hub_to_lower_y%3A9000%7Cknuckles.hub_to_upper_y%3A14000%7Cknuckles.hub_to_strut_axis%3A14000%7Cknuckles.strut_incl%3A8000%7Cwheels.offset%3A1000%7Cwheels.diameter%3A1300%7Cwheels.diameter_expl%3A35000%7Ctires.size_convention%3A0%7Ctires.section_width%3A18500%7Ctires.aspect_ratio%3A6000%7Ctires.diameter_expl%3A50000%7Ctires.width_expl%3A7620%7Ctires.compression%3A0%7D%26rear%7Bframe.susp_type%3A0%7Cframe.bottom_y%3A15000%7Cframe.center_to_upper_mount_x%3A24300%7Cframe.bottom_to_upper_mount_y%3A22000%7Cframe.center_to_lower_mount_x%3A15800%7Cframe.bottom_to_lower_mount_y%3A5500%7Ccontrol_arms.upper_length%3A33400%7Ccontrol_arms.lower_length%3A44000%7Cknuckles.hub_to_upper_x%3A12500%7Cknuckles.hub_to_lower_x%3A11200%7Cknuckles.hub_to_lower_y%3A8000%7Cknuckles.hub_to_upper_y%3A12000%7Cknuckles.hub_to_strut_axis%3A14000%7Cknuckles.strut_incl%3A8000%7Cwheels.offset%3A2000%7Cwheels.diameter%3A1300%7Cwheels.diameter_expl%3A35000%7Ctires.size_convention%3A0%7Ctires.section_width%3A20500%7Ctires.aspect_ratio%3A6000%7Ctires.diameter_expl%3A50000%7Ctires.width_expl%3A7620%7Ctires.compression%3A0%7D%26pref%7Bdiag1.px_per_mm%3A200%7Cdiag1.front_or_rear%3Afront%7Ctab.active%3A0%7Cunits%3A1%7Cshow.f%3A1%7Cshow.ca%3A1%7Cshow.k%3A1%7Cshow.w%3A1%7Cshow.t%3A1%7Cshow.rc%3A1%7Cshow.ic%3A1%7Cshow.fvsa%3A0%7Cshow.tl%3A0%7Cshow.kpil%3A0%7Credraw_during_drag%3A1%7Cchart.x_axis_center%3A0%7Cchart.x_axis_window%3A10%7Cchart.x_axis_num_steps%3A21%7Cchart.x_axis_field%3Atrim.body_roll_angle%7Cchart.y_axis_fields%3A%5BFR%5D.general.roll_center.y%7D

The car is at about 2deg/g body roll at the moment, hence the huge amounts of camber... ARBs are on the ever-growing 'todo' list...! Thanks again for the links.

[pigeondave]

I have a Rob Farley ARB if you'd like to try it.
Its not on the car as i got a flasher one now.