Japfest silverstone 2017

Huw

Club Member
Great on-board vid John. Were you questioning the blockers parentage at 6:15 in the vid?
Shame I missed this weekend it would have been good to catch the action and catch up.
 

Rob Gaskin

Treasurer
Staff member
Site Administrator
That's quite lairy.

It's a lot more exciting to watch than F1!

Also you don't seem to have the overtaking problem they have.

I think you need to change those budget 175/80/14 crossplies now though.

My overall comment is the same as always with your videos John - you are too fast for those type of events/sessions.
 

Mr Ex Jnr

Club Member
Haha fun to watch. You Soon catch up to some packs of novice driver all over track very quick car your z do with some gripy tyres for that hard cornering
 

johnymd

Club Member
A little lairy but good fun was had. I enjoy finding the limits of traction and zeds are very predictable when you cross the limits as there's never any drama. Just slides a little but never seams to want to actually change ends. It has happened to me a long time ago when the setup wasn't quite as good as if currently is.

The tyres are r888r's which are normally very good. They are over a year old now so probably not at their best.
 

Rob Gaskin

Treasurer
Staff member
Site Administrator
John, studying this video from a car roadholding point of view your car seems really 'oversteery'. I know your speeds are very high and you have lots of power but the back seems to step out of line even with the power off.

When I was doing my trackdays my car was quite neutral and if I got things wrong i.e. entered a corner too fast it would understeer or four-wheel drift to the outside of the track. I honestly can't remember having oversteer. If I was drifting and missing the apex I could lift a little just to bring the front tighter but it wouldn't get the back to come around. It was very safe in that respect and like you say these cars are great handling cars - they want to help you out!

Your video at 4.55 when you are at Copse, you tighten your entry a little and the back comes around really fast. If you spectate there during a race the people who get brave and enter too fast end up on the tarmac over the kerb on the outside they very rarely oversteer. At 7.25 you end up by the outside kerb but again it's the back-end that starts it. I'd be interested to hear what Matt (racer) thinks about your 'set-up' he knows the car better than me.

Are your rear tyres the same type as your fronts and what about rear stiffness? Perhaps it's a bit stiff? Tyre pressures?

When you took me around Spa your car behaved differently than this - the only issue seemed to be the rear becoming a little 'lose' under severe braking when the nose was pinned to the ground i.e. into the esses before the pits, or into the first hairpin.

It's a very entertaining video, I really enjoyed it and you were good at 'catching it' with the opposite lock. I also am not underestimating your speeds, the G forces must have been really high - I can see something swinging under the dash that shows the cornering forces.

Jason Plato makes it look easy:

https://youtu.be/DxJqzLLooko?t=8
 
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jonbills

Membership Secretary
Site Administrator
It did seem to go quite early at 4:55. Maybe on the brakes still?
Anyway, very entertaining. Looks a lot of fun.
 
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