Lotus size R888s have just become available in the colonies and I’ve got a set being mounted tomorrow. As we’ve no experience with these yet, can anyone who’s run them recommend hot pressures for track work?
If the weather holds (no ice or sleet), I’m planning to put them on track the day after tomorrow.
which ever gives you the best grip
no straight answer
you will get answers from 22 front hot to 28 front hot
it also depends how many laps you do in one go some people only do 4 or 5 some people do 20 in one go.
So its best to find out what works for you.
which ever gives you the best grip
no straight answer
you will get answers from 22 front hot to 28 front hot
it also depends how many laps you do in one go some people only do 4 or 5 some people do 20 in one go.
So its best to find out what works for you.
Well, yeah, but we don’t even have a good starting point to work from as mine will most likely be one of the first sets mounted on a Lotus here.
Most any experience passed along is better than going in blindly.
As to usage? 25 minutes to 60 minutes non-stop playing rabbit/greyhound with well-prepped track and race cars (mostly Vipers and GT3s).
Start with 20psi front & 22psi rear, & come in & check/adjust every 4 or 5 laps (assuming 2 mile+ lap), until car feels okay for you.
Or get a cheap pyrometer and measure the temp spread across the tyre when you come back in.
Hotter in the middle and the tyre’s rounded indicating lots of pressure, cooler in the middle and edges are taking the brunt of it.
Some have said you’re looking for an even temp across the tyre, others that you want a degree of difference. Thoughts anyone?
Ian
I would have thought that an even tyre temp across the tread would be ideal as this would indicate the largest contact patch and most available grip.
Of course the car’s geo will have a large part to play also…
You normally aim for a 10 degree spread across the tyre, with the inside 10 degrees hotter than the outside and the middle of the tyre mid way in temp showing that the pressures are correct.
Sean - is that an ideal spread or just a pragmatic one based on known geo setup?
I guess circuit layout will also have an influence on results obtained.
Its based on camber as well, obviously the more camber you run the bigger the difference you will see between inside anid iutside, but 10 degrees is what you normally aim at with camber.
just keep an eye on the middle of the tyre.
most people i test have the middle to soft and it gives a lower temp then both the inside and outside edge.
People just seem to run to soft because of forum sheep like advice imho.( every one sets a temp because it works on one car)
So as I stated above no straight answer, you need to find out what works the best for your car.
Toyo even say 28 hot is the best temp which is hotter than the A048.
Toyo even say 28 hot is the best temp which is hotter than the A048.
Temp or pressure?
woops my mistake pressure
ofcourse 28 might be ok on some cars and too hard on others