Blyton 19th Sept

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AdamR
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Re: Blyton 19th Sept

Postby AdamR » Tue Sep 22, 2015 11:18 am

Cheers for the info gents!

Adi - I'm on 180 rears (just about bottoms out gently on the road), fronts are unknown but look about 170-200 range. Chassis balance feels a few % too oversteery and spring rates in this range would tie in with that. I would love some posh shocks with independent compression adjustment so I could get away with softer springs (for better grip) but can't justify them on this car!

Jeff - cheers for that. I thought you were around those numbers, makes sense given the extra weight.

Simon - sounds like you had got it properly sorted then!

Has anyone else done all the roll centre migration calculations for their car? I got some spring rate recommendations from Procomp, which were pretty much the same as you guys are using, but it means the front wheel rates come out crazily high - it now makes sense given the front roll centre migration during roll and bump, though. I am wondering if it's a case of 'they all do that' or mine is a bit weird... I've never seen what is meant to be a well-handling car have such a variable front roll centre location before!

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dopdog
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Re: Blyton 19th Sept

Postby dopdog » Tue Sep 22, 2015 11:36 am

I had all the calculations done for my car and cpm. With the weight of my car I ended up with 150lb on the front and 130lb rear with progressive bump stops.

Had to adjust the dampers a lot but seems to be OK?

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AdamR
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Re: Blyton 19th Sept

Postby AdamR » Tue Sep 22, 2015 11:41 am

Thanks Simon. Guessing that puts you somewhere around 110-120cpm front and 95-105 rear? That's what I was going to aim for (I like a 'soft' car), but Procomp were recommending more like 140 front and 115 rear. Different strokes for different folks, I guess...!

Looks like I can move the lower wishbone chassis pickups upwards around 6-7mm to make a big change to the roll centre migration, so it'll be time to get busy with the welder when I get chance.

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dopdog
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Re: Blyton 19th Sept

Postby dopdog » Tue Sep 22, 2015 12:27 pm

AdamR wrote:Thanks Simon. Guessing that puts you somewhere around 110-120cpm front and 95-105 rear? That's what I was going to aim for (I like a 'soft' car), but Procomp were recommending more like 140 front and 115 rear. Different strokes for different folks, I guess...!

Looks like I can move the lower wishbone chassis pickups upwards around 6-7mm to make a big change to the roll centre migration, so it'll be time to get busy with the welder when I get chance.


I think that is about spot on, also the car has zero droop on the front that acts like an anti roll bar so shifts the weight very well in cornering.

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dopdog
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Re: Blyton 19th Sept

Postby dopdog » Tue Sep 22, 2015 12:28 pm

also a softer car allows you to ride the curbs and just float around, none of this bumping around lark :lol:

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AdamR
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Re: Blyton 19th Sept

Postby AdamR » Tue Sep 22, 2015 1:46 pm

Thanks. I've also played around with zero droop, wasn't quite sure what I made of it - maybe time to re-investigate at some point :)

Yep, many advantages to softer cars if you can deal with the reduced response to your inputs!

Don't suppose you have any in-car vids online anywhere Simon? Edit: Don't worry, I successfully stalked you out on YouTube :lol:
Last edited by AdamR on Tue Sep 22, 2015 3:46 pm, edited 1 time in total.

jeffw
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Re: Blyton 19th Sept

Postby jeffw » Tue Sep 22, 2015 2:56 pm

I think there maybe pictures when Simon launched it at Debden.....or maybe not !

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dopdog
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Re: Blyton 19th Sept

Postby dopdog » Tue Sep 22, 2015 5:21 pm

Ha we dont talk about that, all of the vids are with the rock hard springs, never driven it on the soft settings :D

jeffw
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Re: Blyton 19th Sept

Postby jeffw » Tue Sep 22, 2015 7:16 pm

lol....so how the hell do you know if it worked or not :shock: 8-) :?

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dopdog
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Re: Blyton 19th Sept

Postby dopdog » Tue Sep 22, 2015 9:21 pm

Its all in the maths,

Not just theory did the same with my striker just before I got my first FTD in it. Check out some of my old times at north weald in it ;)

I can guarantee that it will be quicker and put in better times than before but alas we shall never know :roll:


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