Recent content by John LNZ

Thanks Mike - what are your thoughts on the moment arm theory which Bob Bolles talks about regularly. Whilst working on our roll centre migration we are also trying to keep our right front camber change to the minimum. We run about 3.5 deg negative with about 0.7 loss through 2.5 deg of roll and...

Hi Mike, I have been working with the Performance Trends programme to assist in re-design of front suspension on our dirt cars. I am particularly looking at my front roll-centre migration. We run a stacked right front spring and as such have 2.5 deg of roll. I seem to have quite a lot of...

Hi everyone, Can anyone point me to any audio books on Holley carburettor tuning - great to have something to listen to on long drives! Thanks in advance

Hi Ranger Mike I have a query please. What are the effects of the front roll centre migrating either right or left during roll? I know it will change the loading of the front tires but would like to understand it further. Thanks John

Hi Mike. I'm working on some wheel rates - what do you think about measuring out to the ball joint or out to the tire contact patch to do the calculation? It seems the contact patch is more relevant than the ball joint to me, and would like your thoughts on this. We seem to have found a nice...

Hi Mike Happy New Year to you from NZ. A couple of questions for you please. I can't seem to find any information on how to find anti-squat in a typical sprint car rear end layout - radius rod on top, torsion arm on bottom. In our situation we use a lift bar instead of torque tube. Can you...

Hi Mike, thanks for the reply. Sounds like we are on the same wavelength on the polar moment. We have done some work with the four bar and have found some gains using it. However we find the car is too inconsistent and we are unable to hold a tidy line. In New Zealand Speedway, every track has...

Thanks Mike. I would like to give you a little more information on the car. The front suspension is very close to a late model set up - 3 1/8 front roll centre slightly to the right. We use the same front tyres as a late model, shocks are open. We use the new Bilstein with any valving options...

Hi, I have a couple of questions please: What do you think about raising the centre of gravity to promote more forward bite via balast placed above the rear axle? This is for a New Zealand Super Saloon which is closest to a US dirt late model in design. Runs on a flat slick 1/4 mile track with...

Hi Mike. A question for you please... We have a car that is still struggling for side-bite on a flat slick trac. I am considering reducing my front roll couple by either reducing my right front spring or lowering the rate of my swaybar. I figure that this should transfer more weight onto the...

Hi Mike. I am a new member to this forum. I am a racecar fabricator in New Zealand. Have found your posts on this site really interesting as I am very much into the physics and the effects it has on racecar set up and construction. I build various types of cars for dirt oval racing...