BEAVIS' White Track Car

SKYHI · Postby **SKYHI** » Mon Jan 30, 2017 3:17 pm

Should be more than enough power, combined with the aero, to produce some decent times. Looking forward to seeing the results.

16bit · Postby **16bit** » Mon Jan 30, 2017 3:29 pm

sequential, chevy 9 inch rear end, bigger drive shafts and 400kw is what it needs! also ls3 would be good.

16bit · Postby **16bit** » Mon Jan 30, 2017 3:40 pm

but seriously, it looks pretty awesome.

do you have a way of measuring how effective the aero is? like a load sensor of sorts?

rascal · Postby **rascal** » Mon Jan 30, 2017 4:12 pm

16bit wrote:do you have a way of measuring how effective the aero is?

+

speed · Postby **speed** » Mon Jan 30, 2017 5:14 pm

Just out of curiosity, what are the specs?
Is it a stock 1.8, ND twismount, ND 3 inch exhaust and what else?

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Postby **beavis** » Mon Jan 30, 2017 7:52 pm

16bit wrote:but seriously, it looks pretty awesome.
do you have a way of measuring how effective the aero is? like a load sensor of sorts?

My budget is not at the level of load sensors and the like. However there are two solutions that I've used:
The first is the option that rascal has so nicely detailed... testing at a track and comparing laptimes.
The second which I've used a few times is to record the suspension compression at speed via a gopro and use some simple maths to convert suspension movement into approximate weight (downforce amount) over the suspension arms.

speed wrote:Just out of curiosity, what are the specs? Is it a stock 1.8, ND twismount, ND 3 inch exhaust and what else?

VVT 1.8 with standard engine internals
6spd
3.6 LSD
NitroDann Exhaust Manifold/Downpipe
GT2560 turbo from a silvia
Trackspeed Engineering 11.75" wilwood brake kit
3inch exhaust
Megasquirt MS3-pro PNP
Deatschwerks DW200 fuel pump and 700cc injectors
Lightyear fastback
15x9 rims with A050's
MCA 'purple' Coilovers
About 950kg

speed · Postby **speed** » Mon Jan 30, 2017 7:57 pm

Very nice. You replied to me on FB. I didn't think about the fuel pump and diff.
Look forward to seeing your vids.

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SKYHI · Postby **SKYHI** » Thu Feb 02, 2017 11:56 am

What size AO50s are you using on the 15x9 wheels?

pepejesus · Postby **pepejesus** » Thu Feb 02, 2017 1:27 pm

I'm gonna guess the 'fat boy' 225/50s... they're a bit too tall but they're still the fastest on a 15 inch wheel

Postby **beavis** » Thu Feb 02, 2017 1:50 pm

Indeed, 225/50's

SKYHI · Postby **SKYHI** » Thu Feb 02, 2017 5:45 pm

Ah right. Considering some 15x9" wheels for my car but tyre choice is very limited. They don't look too bad on the 9" rim, slightly chunky sidewall, but I imagine there'd be some decent guard rolling required to run on a street car.

Postby **beavis** » Thu Feb 02, 2017 6:02 pm

If it's purely a street car, 15x8's are more than enough and will perfectly match some 205/50's

Postby **Okibi** » Thu Feb 02, 2017 7:21 pm

We can't run softs in our club motorsport but i've been using 215s instead of 225 A050s mediums. We do have a lot more Autokharana/Sprint type events instead of just track work.

pepejesus · Postby **pepejesus** » Thu Feb 02, 2017 7:29 pm

TCR wrote:Ah right. Considering some 15x9" wheels for my car but tyre choice is very limited. They don't look too bad on the 9" rim, slightly chunky sidewall, but I imagine there'd be some decent guard rolling required to run on a street car.

15x9s with the right offset and 225/45s should fit on your SE with maybe just a flat roll. But as you say, not a lot of choice in tyres, A050s, NT01s, RS3s... not sure of much else.

I run 15x8 +20 or 25 (not 100% sure) with 225/45 NT01s on my SE and have just a flat roll at the rear, no roll at the front, I get some minor rubbing on fender liners at full bump at the front but nothing I'm worried about. I will buy 205/50s for my next set of tyres because they are significantly cheaper than 225s generally.

If you're not tracking the car, or if you're ok with not getting every last 0.1%, then 15x8s and 205s are cheaper and give you a lot more tyre options. If you want to go fastest at all costs then 15x9s and 225/50 A050s.

SKYHI · Postby **SKYHI** » Fri Feb 03, 2017 10:21 am

beavis wrote:If it's purely a street car, 15x8's are more than enough and will perfectly match some 205/50's

pepejesus wrote:15x9s with the right offset and 225/45s should fit on your SE with maybe just a flat roll. But as you say, not a lot of choice in tyres, A050s, NT01s, RS3s... not sure of much else.

I run 15x8 +20 or 25 (not 100% sure) with 225/45 NT01s on my SE and have just a flat roll at the rear, no roll at the front, I get some minor rubbing on fender liners at full bump at the front but nothing I'm worried about. I will buy 205/50s for my next set of tyres because they are significantly cheaper than 225s generally.

If you're not tracking the car, or if you're ok with not getting every last 0.1%, then 15x8s and 205s are cheaper and give you a lot more tyre options. If you want to go fastest at all costs then 15x9s and 225/50 A050s.

Looking to set my car up for some weekend track work. The 15" wheels and tyres will more than likely just be for the track, so I think I'll go with the 8" rims and the 225/45 RS3 or NT01 tyres for now. In the long run this will give me more options with the tyres as mentioned.