Eastern Creek Times

[oztrack]

I have a friend going to a Eastern Creek trackday tommorrow. Im interested in what sort of times people have done around Eastern Creek - just as a yardstick.

[FatBoy]

1.48.3... Shoulda gone faster but ran out of time, money and talent... :)

It'd really help if you gave a few more details mate. Is he going in a stock road tyred Commodore or a stripped out slicks equipped track monster ??

[BOMI]

Steve, 2.01 in the rain through backmarkers, I think a 1.55/56 was in doable.

Troy :)

[oztrack]

Its a XY GT with a LS1 232 232 110 cam and a PWR running 10 psi. It has quite good brakes and suspension. Its an M6 with 3.5 gears and a 9". Text clutch. Not sure what tyres it will be using - but its been around the track a few times before.

[SSUte01]

Somehow I dont think power will be his trouble, but will have awesome fun trying. Who says GM and Ford cant mix, different that's for sure, different in a good way :)

[oztrack]

He would like to have a Ford engine in it. But at this stage there is nothing that makes the hp for the money that fits as nicely in the engine bay.

[35R]

I'll guess 1:55's - depends on tyres and driver, tyres and weather of course. Let us know how it goes Steve, maybe yuo can get some pics?

[firebug]

Its a XY GT with a LS1 232 232 110 cam and a PWR running 10 psi. It has quite good brakes and suspension. Its an M6 with 3.5 gears and a 9". Text clutch. Not sure what tyres it will be using - but its been around the track a few times before.

Does it happen to be blue??

[oztrack]

Its going to be running street tyres. Yes its Blue, it was in Street Machine.
I will get some pics and video. Plus we are planning to gather track log in plotter GPS just for fun.

[BOMI]

Sounds awesome, look forward to seeing the info and pics :yep:

Troy :)

[oztrack]

We had a great day at Eastern Creek. The GT did a best of 2:03.1 and that was funny enough done on MT ET Drag Radials 235/60 x 15 which were a bit better than the Yokohama 352 that it has on the street - It got down to 2:04 on them. Willem was backing off at about the 200m mark in the straight at around 215kph. The XY GT has stock level VX brakes and a show quality paint job. (We saw another driver swerve to miss a Porsche on tirn 1 and back it fast into the wall)

Another friend with a VX Clubsport 3.45 diff, normal road tyres, PT OTR and Mafless got down to 2:03.9. Plus one of Willems mechanics got down to 2:15 in a stock old 1980s Bluebird :)

[BOMI]

We had a great day at Eastern Creek. The GT did a best of 2:03.1 and that was funny enough done on MT ET Drag Radials 235/60 x 15 which were a bit better than the Yokohama 352 that it has on the street - It got down to 2:04 on them. Willem was backing off at about the 200m mark in the straight at around 215kph. The XY GT has stock level VX brakes and a show quality paint job. (We saw another driver swerve to miss a Porsche on tirn 1 and back it fast into the wall)

Another friend with a VX Clubsport 3.45 diff, normal road tyres, PT OTR and Mafless got down to 2:03.9. Plus one of Willems mechanics got down to 2:15 in a stock old 1980s Bluebird :)


Drag radials :eek::eek::eek:

WOW!!

Thats some good times for a car thats not set up for circuit 100%

Troy :)

[oztrack]

I didnt think the ET Radials on the rear would be any good. On my car they are terrible around corners even with 35psi - so i was watching it with fear!. But he found them better than the 352s. :) at least after 1 full lap but by 4 laps they were getting slippery.

[MY Racing 221]

1:53.76 in the Corona.

[35R]

We had a great day at Eastern Creek. The GT did a best of 2:03.1 and that was funny enough done on MT ET Drag Radials 235/60 x 15 which were a bit better than the Yokohama 352 that it has on the street - It got down to 2:04 on them. Willem was backing off at about the 200m mark in the straight at around 215kph. The XY GT has stock level VX brakes and a show quality paint job. (We saw another driver swerve to miss a Porsche on tirn 1 and back it fast into the wall)

Another friend with a VX Clubsport 3.45 diff, normal road tyres, PT OTR and Mafless got down to 2:03.9. Plus one of Willems mechanics got down to 2:15 in a stock old 1980s Bluebird :)

Sounds like you guys had fun Steve, running drag radials too!

did you have a go yourself?

[oztrack]

No i was happy to help out and watch for a change. It great fun though - I can see how you guys have enjoyed it and developed so far.

We were also glad to bring 3 cars back in one piece as well and all quite healthy still. Each car got about 6 runs of around 20min each.

[2 cylinders shy]

Oztrack
Ive always liked the analytical aproach you seem to have towards drag racing and would like to see how you would aproach circuit racing?

[oztrack]

It certainly requires some different tuning. The cars visited load areas that were different than the usual today.

There would be heaps to learn as its very different to the strip.

[35R]

It certainly requires some different tuning. The cars visited load areas that were different than the usual today.

There would be heaps to learn as its very different to the strip.

So much more punnishing on the motor too hey. A 20 minute session at at circuit, with very high average RPM, i am amazed our cars hold up to it.

[oztrack]

The high intake temps from the PWR SC were well dealth with in the tune - getting up to mid 80 degs. BUT once early in the day when following another car for a while - it showed it was in a more extreme situation. So this was accounted for in the next update of the tune calibration. The water-air intercooler cools things down very quickly when the car is off boost - but when its in boost it keeps rizing up to the mid80s.

Interestingly most of the trimming occurred at low rpm under boost when a friend got to drive the car and took it easier driving down below 2000rpm a a place that the owner would rarely put it. :)

[oztrack]

Here are a couple of pics.

http://i77.photobucket.com/albums/j45/oztrack/willemsGTenginebay.jpg

http://i77.photobucket.com/albums/j45/oztrack/GTateasterncreek.jpg

[MY Racing 221]

That's awesome... Impressive bit of gear there!

[35R]

nice car Steve, awesome

[firebug]

That's the one I'm thinking of... Nice mix...

[DaveHAT]

Circuit racing on ET streets ... whoda thought it?

Some might consider that an act of bastardry putting a Chev engine into a Ford but IMO that does look rather faecally warm. :bravo:

Who screwed it all together and fitted the PWR? Looks like a tippy top install.

[oztrack]

Hi Dave, Willem did it all himself - its incredibly surprizing to ride in, its not what i expected - its very predictable, comfortable and promotes confidence in the way it brakes and steers. He has planned to put a Ford engine in it eventually again but at this stage he can't see anything thats stands out. The Boss is heavy and will just fit in the bay. But its a backwards step in terms of handling and power.

Today the engine had the 232 232 110 575 cam pulled out and replaced with a Thunder Racing T-rex 243 249 110 and it still retains the PWR blower :). It will be interesting to see what the combination is like.

[Beej]

Just for reference, I got down to 1"52s (1"52'.537 best), in my old VTII SS at a 2006 state Supersprint championship meeting. That was a road registered car with a 220-ish cam, upgraded shocks/springs etc and RE55s, otherwise full weight (1600+kg's in race trim ex driver), stock sized brakes etc.

Cheers,

Beej

[PSI38L]

I did a 1:50.96 at dutton NSW this year. I would love to spend a day there to get used to the track

[DaveHAT]

Today the engine had the 232 232 110 575 cam pulled out and replaced with a Thunder Racing T-rex 243 249 110 and it still retains the PWR blower :). It will be interesting to see what the combination is like.

:shock: wouldn't that CAM be completely inappropriate for a forced induction application? How is it going to build any boost with a 110LSA and duration that big?

The results should be interesting. I reckon the blower will be working hard to try and keep up.

Clever fella that Willem ... tidy job. :bravo:

Does it run power steering, A/c?

[oztrack]

The cam for a blower is apparently a very different story than for a Turbo. eg. Tonner is using a 228 230 112 in his and its making 450rwkw. Different blowers might like different cams though.

The PWR is coming off soon and it might get a single plane Super Torker so that it can use the shaker. It will just be interesting to see what its like.

Hey Beej or anyone else
How much faster do you think a car would do on RE55s around Eastern Creek? I remember how good mine were on the street - they are awesome. :)

[Beej]

Hey OzTrack,


Hey Beej or anyone else
How much faster do you think a car would do on RE55s around Eastern Creek? I remember how good mine were on the street - they are awesome. :)

At a circuit like Eastern Creek I'd reckon RE55s would be worth up to 4 secs all other things being equal. At Wakefield, maybe something around the 2-3 sec mark.

However, some people find an even bigger gain, as the sticky tyres are actually much "easier" to drive on at the limit when on the track compared to street tyres. The streets get too hot too quickly and turn into ice skates - it takes a very good driver to get the best possible lap times on them. Whereas the RE55s and similar build confidence at the limit as they allow you to slip and slide a bit but still be in control of the car as they loose the grip in a staged fashion.

Cheers,

Beej

[MY Racing 221]

However, some people find an even bigger gain, as the sticky tyres are actually much "easier" to drive on at the limit when on the track compared to street tyres. The streets get too hot too quickly and turn into ice skates - it takes a very good driver to get the best possible lap times on them. Whereas the RE55s and similar build confidence at the limit as they allow you to slip and slide a bit but still be in control of the car as they loose the grip in a staged fashion.

Cheers,

Beej

Yeah, I agree - probably around 4 seconds.

However, I don't necessarily agree that they are always easier to drive on at the limit. Yes, they do remain effective for far longer, however because their effective grip is so much higher, the speed through corners is much higher also for the tyres to be working at an effective slip angle. As a result, I've seen many drivers struggle to come to terms with 'semis' for this reason. Also, to be effective, they will also require a significant change to wheel alignment settings.

Normal road tyres will start slipping and sliding excessively after a few laps, particularly in a heavy car. This in turn makes it more difficult to turn the car into a corner and you start missing apexes. From that point of view, at the same speed the 'semis' are going to be a far better proposition.

Having said all that, if you have the chance, get yourself a set (whether they be Yoko A048, Dunlop R or the RE55s) and see how you like em.

Oh... and back on topic... did a 1:53.15 in qualifying today.