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Post by andrewa on Nov 26, 2014 19:28:48 GMT
I'm taking the 1800 to Goodwood on 5th Dec for their end of season trackday which is basically a charity fundraiser organised by the circuit marshalls ( I believe Lord March lets them have the track for free for the day). I'm running 175/70/14s on my car and on the road run 34 psi at the front and 30psi at the back. Looking at this contemporary test I'm about 10 psi too low all round!!!!!!
www.bluestreaksix.com/austin1800/Page21.html
Be interested in views / opinions / suggestions...seems a touch high to me....
Cheers Andrew
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Post by Penguin45 on Nov 27, 2014 0:44:53 GMT
I don't honestly know the answers to this one, Andrew. The Wolseley runs 165/14 80s at 30/26, but then I don't tend to do a lot of chucking.....
Reading the article tells us that the car ran on 13" wheels, so smaller. The higher pressures would encourage the front of the car to break away, which for tarmac racing might be desirable, I'd think, if it was in a controllable fashion. Bear in mind that it is a nose heavy car anyway.
I was surprised at the comments about the change of handling simply by removing the spare wheel. It doesn't weigh that much in relation to the overall weight of the car.
All I can really say is that if you've got a few practice laps before the timing gear is switched on, experiment. 32/28 and see what happens?
Chris.
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Post by dave1800 on Nov 27, 2014 1:29:33 GMT
I think if you run the tyres at the pressures suggested in the link that it is probably a bit close to their maximum. One of the authors of that report recently told me that he now runs 185/70 14" tyres at 34F 32R but that's on 6" rims. I'm not sure if he has the other mods such as shocks and anti roll bar etc on his current cars. The higher pressures will of course help the tyres run cooler but it is in December and I'm not sure how many laps you will be doing. I think you will need to experiment a bit and get the best balance for the way you like to drive. I see the car they used had the suspension lowered by reducing the pressure. That affects the front end geometry so will alter the handling too. I believe it was a Mk1 car so again there may not be a direct read across. Don't forget to check the tie rods  Sorry there isn't a simple answer to your question. Regards David I'm taking the 1800 to Goodwood on 5th Dec for their end of season trackday which is basically a charity fundraiser organised by the circuit marshalls ( I believe Lord March lets them have the track for free for the day). I'm running 175/70/14s on my car and on the road run 34 psi at the front and 30psi at the back. Looking at this contemporary test I'm about 10 psi too low all round!!!!!!
www.bluestreaksix.com/austin1800/Page21.html
Be interested in views / opinions / suggestions...seems a touch high to me....
Cheers Andrew
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Post by andrewa on Nov 27, 2014 14:31:40 GMT
Thanks for that - I'm inclined to start as suggested by Chris and see how it goes. I'm looking forward to seeing how it performs without getting too carried away and warping discs/hurting it too much. Weather forecast cold but dry. Will report back in due course!
Thanks for the suggestions gents.
Andrew
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Post by dave1800 on Dec 9, 2014 3:54:18 GMT
Nice write up again in LOCI mag! How did things go at Goodwood on 5th and what tyre pressures did you settle on in the end?
Regards
David
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Post by andrewa on Dec 9, 2014 13:50:43 GMT
Thanks David - haven't seen it yet.
Will do big update soon - just waiting for piccies from Friday!
Don't want to spoil it but car was awesome.
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Post by indianajones on Dec 9, 2014 19:09:03 GMT
Oh this is gonna be good  -Andrew |
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Post by andrewa on Dec 9, 2014 20:51:52 GMT
Apparently it's going to be in Classic Car Weekly (not the one that's out today) - next weeks.
Still waiting for photos....
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