I like the comparison to the heavy trailer on the rear.
I will try a few bags of cement on the bonnet and see what differance it makes
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| Twini Suspension settings https://www.ausmini.com/forums/viewtopic.php?f=2&t=77048 |
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| Author: | IndigoBlueCooperS [ Sun Jun 03, 2012 7:12 pm ] |
| Post subject: | Twini Suspension settings |
Hi all, I am trying to set the suspension up on the Twini. I would like a bit more feel in the front as it floats around a bit. I am going to increase the caster, but would like to know what others run? For other settings I have about ½ degree negative camber all around, and a touch of toe in front and rear. I know it's not the normal Mini, but am interested in any thoughts. |
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| Author: | Beanie [ Sun Jun 03, 2012 9:28 pm ] |
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If you can dial in some more camber ... -1.5 degrees and 5-6 degrees of castor .. Beanie |
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| Author: | low n blown [ Sun Jun 03, 2012 9:36 pm ] |
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camber wont give you the sense of feel you are looking for but the castor certainly will. That will affect how much the car wants to straighten up out of a corner. Check your toe setting as well both front and rear. Standard is enough on the front, and you would want a little toe in on the rear or it will feel skittish in the back end. If there is added weight in the bum you may want to stiffen up the back-end but thats just a guess. Speak to Fred Sayers. He races a twini and would be offer better advice. |
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| Author: | IndigoBlueCooperS [ Sun Jun 03, 2012 9:45 pm ] |
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Fred Sayers? - Anyone have his contact details? |
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| Author: | drmini in aust [ Sun Jun 03, 2012 9:48 pm ] |
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I reckon you want a little toe-out on the front, as it's a standard Mini setup there. |
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| Author: | TheMiniMan [ Sun Jun 03, 2012 9:57 pm ] |
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Fred doesn`t race the twini normally, it`s Billy Westermans thing & they`ve been playing with the handling for quite some time, only lately have they had any glory & i`m not sure they`re totally ontop of it yet & if you have "toe-in" at the front then i`d set that to --> "Toe-out" first, maybe 1/16th to start with & yes about 4deg of caster is fine for nearly every occasion But!!!... the camber depends on a pile of things--> what tyres you run what spring rates you have how stiff the body-shell is your driving style & what you`re using the car for -->but a half deg would be good for starters , just to get you feeling things out |
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| Author: | simon k [ Mon Jun 04, 2012 11:35 am ] |
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very interesting... with the extra engine in the back it'd be like driving a normal mini with a heavy (over the ball) trailer, or 6 bags of cement in the boot. I've done both of those, and I think I know the floaty feeling you're talking about can you stiffen the back-end? maybe hydrolastic top arms at the back and rubber top arms at the front... |
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| Author: | Morris 1100 [ Mon Jun 04, 2012 3:58 pm ] |
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I would leave the camber and castor alone for a while and just play with the toe settings. I think that most of the feel will come from that area. |
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| Author: | IndigoBlueCooperS [ Mon Jun 04, 2012 11:35 pm ] |
| Post subject: | |
I like the comparison to the heavy trailer on the rear. I will try a few bags of cement on the bonnet and see what differance it makes .
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| Author: | TheMiniMan [ Tue Jun 05, 2012 11:59 am ] |
| Post subject: | |
i can tell you that (after you`ve sorted your light/loose/darty front end) that you may want to play both front & rear bump steer... Billy & i have had some awesome disscussions & have played around a fair bit on the rear & found remarkable improvements with his twinny doing this i can`t say much about your particular car as i havn`t driven it,,, & you may not have the same type of limited-slip rear diff as Billy does,,, but it`s definately worth a look at if you have any trouble with it being too pushy, then suddenly changing to too loose 
bump steer on all minis isn`t pretty, they`re not a perfect geometry by any means, & when i set-up my rack on my buggy i made sure it had "ZERO" bump steer,,, yep,,, you read it right--> "ZERO" !!!! & it`s just awesome to drive,,, perfectly stable , very predictable, & it just does everything i want it to,,, so this is where i`d spend my time with your car, setting up the bump-steer (front & rear) as best you can (once you`ve sorted the light front end of course)
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| Author: | IndigoBlueCooperS [ Tue Jun 05, 2012 8:13 pm ] |
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The Twini is set up as a road car, and is very neutral to drive. No pushing and pulling, minimal understeer or overseer. The engines have the same power / torque curve (well so the dyno states) and are set up to accelerate in unionism. Both hit WOT at the same time. Standard diffs front and rear, and obviously the same gear ratios. Two orange clutch’s which is a little heavy in the traffic. There is a little bump steer from the rear. Hit a pothole, and it takes a small step to the left (or right). I have no easy way of adjusting this so will live with it. What car doesn’t move a bit when you hit a pot hole? As for the normal alignment settings, I will have the caster set to around 6 or 7 degrees, and a touch of toe out front and rear, with ½ degree negative camber all around. Hopefully this makes the difference I am after. It will be interesting to see how Bills car goes when he has it sorted. Thanks for all the ideas – See you in Hay
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| Author: | TheMiniMan [ Tue Jun 05, 2012 8:43 pm ] |
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i`d just have toe-out at the front only the rear i would set at either 1/16th toe-IN , or set it straight ahead i don`t like toe-OUT at the rear of any car (but that`s just me) especially if it`s already stepping out over bumps i`d definately be making the rear arms with adjustable mounting points to set the rear bump steer tho, placing the rear-outer steering joints (for want of a better description for the things) in the spot where the least bump steer is possible,,,but again , that`s just me. have fun man & hope all goes well Bills Twinny is allready pretty awesome so i think he`ll probably leave it how it is now, just my guess tho.
cheers Matt edit--> Oh & sorry i won`t be at Hay, no license, no time, & no money 
Looks like i won`t even get to Valla for the big VW meeting this August either
i`m a sad sad man right now
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| Author: | simon k [ Wed Jun 06, 2012 9:56 am ] |
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I reckon straight ahead toe at both ends. For equal balance cars (like Alfa GTV's with a transaxle - guy I work with has one and thinks it's the best car ever built), they have their wheels straight up and down and straight ahead. If there's any alignment issue they'll bump steer bump steer at the back will also mean squat and droop steer. I'll see you at Hay - I looked at your car at Minis At The Mill a few years ago (2009 maybe?) and was very impressed. Was GR doing your motors a couple of months ago? if so, I was there when he dyno'd the second one
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| Author: | IndigoBlueCooperS [ Tue Jun 12, 2012 8:23 pm ] |
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Well, Set the Caster to 6 degrees, Camber -1/2 all around, And a touch of toe out on all the driven wheels. Tracks well on the road and handles the bumps with minimal bump steer. Did the tip to Hay and back without issue. Can't say the same about my driving skills and two WD's at the moterkhana, but it was great fun. |
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