XR6 Turbo Circuit Racer

[Greg Rust]

Good shit.
I did Astra PS on the XW. Was a good thing. I ended up wiring it with a switch so could start the car and then flick it on and also use it when engine not running to help move it around

[Komdotkom]

You may already know this but the Redline power steering fluid is the fucking business and you really have to try to boil it. Heat can be an issue with the Astra pumps depending on where you mount it but the redline magic juice fixed all my issues.

[ahk068]

You may already know this but the Redline power steering fluid is the fucking business and you really have to try to boil it. Heat can be an issue with the Astra pumps depending on where you mount it but the redline magic juice fixed all my issues.

I'll try this. I won't get time to fit the Astra pump before the next round so decent fluid should help.

I've been looking at the coilover set up. No one in Hobart has a set of corner scales so I've been researching Mumford beams which I reckon I can make. Anyone done this before?

[ahk068]

Mca's arrived and have been fitted. Race Primes with 20/10 springs as recommended by Mca as I have no idea. I filled the driver's seat with sandbags to get ride heights level as the old ones were ugly. Front is similar height, rear slightly lower.

It's about to be sent for a wheel alignment and I'm keen for input. Last time out on a really hot track it understeered like a bitch on entry of low speed corners (hairpin at symmons) but is very good medium speed corner (end of sweeper at symmons). It runs a 28mm whiteline adjustable front bar set on hard with the same rear bar albeit 24mm set on soft.
Toe I have no idea, -5 Front camber, -2 rear camber. We were going to set front/rear tow at zero and see what happens. Thoughts?

2nd, new rear coilover is captive design so spring no longer sits on lower control arm. I'm hoping this means i can ditch standard lca and make a chromoly rod or similar. I'll need to however mount the sway bar to it and I'm not sure it the bump stops will be needed now. Any ideas are welcome.

[hiddeous]

It will be interesting to see how the upper shock mount structure goes support the vehicle wieght.

Do mca have many Setups like this in service?

[ahk068]

It will be interesting to see how the upper shock mount structure goes support the vehicle wieght.

Do mca have many Setups like this in service?

Agreed. All Fg set ups are like this so would be a few. I reckon I'll make a brace for the inside long term. Assembly has 1-2 millimetres of clearance and adjusting spring height pretty much means removing the lot.

[BigMuz]

Shock loads are way higher than weight loads. The most the weight load can be is 1 x the car's weight. The shock loads could be 2 or 3 times more.

[ahk068]

MCA with no other changes apart from a better wheel alignment dropped my PB from 63.4 to 61.9 around Baskerville. 2 deg rear camber, 5 degrees front. no rear toe. 2mm tow out front. Understeer heaps better with medium kuhmos on the front, hards on the rear. I need to push the car harder, just a matter of building confidence in it.

Astra PS pump here now and have ordered Davies Craig water pump. It's off season so chasing 20kg and 20kw before next year. Need to run a 60 now as I've been bumped up a class for next season.

I won the final round and finished 2nd in the championship in a pretty small field. Next class up is much tougher and really need to be sub 60 to be competitive but if I qualify well I'll be in the mix

[ahk068]

cool pics

[ahk068]

Updates in no particular order. I ended up winning the state championship in my class which was an unexpected bonus but also sees me go up a class so need to find a couple of seconds at Baskerville and probably 3 at Symmons. Dumping parasitic loss was a first step. Electric power steer and water pump. Test Friday so we'll see how it goes but initial feedback is it free revs a lot crisper.

Finally pulled heater out, all 14kgs of it which should help.

[Greg Rust]

Does the class allow polycarbonate windows?

[chartreusehj]

Nice one Troy!

[ahk068]

Does the class allow polycarbonate windows?

yep. pretty loose set of rules

[Greg Rust]

Coolness there’s your next mod.

[ahk068]

Already done. Intrusion bars cut out, doors are basically gutted.

Next set of mods will be around replacing the 270k old bushes in the suspension and finding some adjustable Lca's. Will rose joint it where I can unless someone has a better idea.