Escort Sigma 1600 Race Car

[Roadsport]

Re: Escort Sigma 1600 Race Car

Yes they were running too high. I ran them at 2,0 bars cold and now that im older and wiser I'm running considderably less.
That cured the excessive pressure build up during the track time.
The car weights 870kg's what sort of pressure would you recommend?

[dug112y]

Re: Escort Sigma 1600 Race Car

i run a fwd fiesta of similar weight and depending what it is i stagger the pressures( i.e if its more right handers the left hand side tyres do more work and get hotter than right hand side tyres).... but i start around the 22 psi mark.

[Graham]

Re: Escort Sigma 1600 Race Car

Maybe stiffer front springs are worth a try next year, just from looking at the pics??
Might just be the angle of the pics though, guess it must handle pretty good..

stiffer front springs would keep the front flatter, which would improve traction out the bends

[Roadsport]

Re: Escort Sigma 1600 Race Car

Would a stiffer ARB do the same?
Exiting a corner at higher speed is pretty much the key to improve laptimes.

[Roadsport]

Re: Escort Sigma 1600 Race Car

i run a fwd fiesta of similar weight and depending what it is i stagger the pressures( i.e if its more right handers the left hand side tyres do more work and get hotter than right hand side tyres).... but i start around the 22 psi mark.

Do you leave the harder worked tyres harder or softer than 22psi?
Harder tyre should warm less but may end up with more pressure due to the higher starting pressure.

[Roadsport]

Re: Escort Sigma 1600 Race Car

Ordered some new bits for the upcoming clutch update.

Had some change of emails with Steve from SBD and were planning on going with the 7,25 double organic disc dlutch.
I'm very tempted yet have a tiny doubts. I've contacted the manufacturer to ask for theyr recommendation for my car.
I'd absolutely love an organic clutch. The accurate clutch feel would pretty much guarantee lightning smooth, fast grid starts! Another advantaged in light weight low powecar.
Steve also suggested I'd go for the hydraulic clutch but I have to decline. With the price of this clutch and added price of hydraulic conversion I just can't come up with the money.
But however I needed to resolve the dodgy release bearing issue. I need to use a round face bearing due to using 7.25" clutch. I've so far used an Opel CIH bearing with somewhat questinable outcome. DNF in its third full event. So after hours of web searcing I found a the good old Burton boys had the perfect solution! I have been talking about this release bearing issue to alot of engine builders and reseller but no one has this kit nor did tey know about this.


The bits I ordered

[Graham]

Re: Escort Sigma 1600 Race Car

looking at your tyre pic again suggests to me you have two wear issues, one being over inflation hense the wear on the inside but also the shoulders are heavily scrubbeed suggesting under inflation but that could be the tyre tuck, i'd be looking at keeping the same tyre but using it on a wider rim to stretch it more, that should allow you to reduce pressure a bit and keep the tyre well supported on the rim

[Roadsport]

Re: Escort Sigma 1600 Race Car

I believe this outer wear is due to tyre tuck. The inside of the tyre lifts and the uter shoulder wears down. It has been doing that despite the excessive pressure. Hence the camber modification.
Now the wider rim idea might be worth lookin into. Alltough regulations only allow 8inch wheel which I currently have and an +/- 0,5" tolerance.
So I can only bend the rules upto 8.5 inch wheel? Do you recon that worth the investment? Mind that I'd only need to purchase wider inner halves of the rim.

[Graham]

Re: Escort Sigma 1600 Race Car

an extra .5 inch on rim width is well worth having

[Roadsport]

Re: Escort Sigma 1600 Race Car

Compomotive has discontinued the split ML rims so nooo wider rims for me....unless i can use some other makes inner rims.
Wouldn't a lower profile help too?

[Graham]

Re: Escort Sigma 1600 Race Car

from converstaions i've had with compomotive they buy in the rim sections, so you might get suitable from elsewhere, image perhaps?

[Roadsport]

Re: Escort Sigma 1600 Race Car

I've asked Superlite and Image now. We'll see. Thanks for the tip Graham.

[Roadsport]

Re: Escort Sigma 1600 Race Car

http://www.youtube.com/watch?v=RSZBRuAXDH0&feature=related

[exboyracer]

Re: Escort Sigma 1600 Race Car

There are some very interesting looking cars in that race

[Group4_Mark2]

Re: Escort Sigma 1600 Race Car

I like the beetle. seems to be fast too.