JamieP Posted January 10, 2010 Author Share Posted January 10, 2010 Hmmm, just seen there is a driveby test at 87.5 dba. Might get one run in, im now thinking thunder road might be a better day, that opens in a couple of weeks, ill post in here when open so be quick if you want a spot. Quote Link to comment Share on other sites More sharing options...
AshBhp Posted January 10, 2010 Share Posted January 10, 2010 My car struggled top end, I think with the T67 and associated changes I've made, I'd hope for 190+, trouble is stopping at the end, the UKs were on the limit stopping from 180 in the space given How long was the stopping distance after 2 mile? Quote Link to comment Share on other sites More sharing options...
JamieP Posted January 10, 2010 Author Share Posted January 10, 2010 Thunder road is a standing start 1 mile race, this is the results from last year, that monaro that won has 625rwhp, same as me but weighs about 200kg more. Quote Link to comment Share on other sites More sharing options...
sdistc Posted January 10, 2010 Share Posted January 10, 2010 Haha love that - one bloke brought his SS ute Quote Link to comment Share on other sites More sharing options...
sdistc Posted January 10, 2010 Share Posted January 10, 2010 (edited) Aero is the Supra's biggest problem, not power. What makes you say that? The Supra has a pretty slippery friction co-efficient at 0.32, better than a lot of modern sports and supercars (for comparison, the Veyron's is 0.36 and R35 GTR is 0.27 linky). It is a big fat car though, which means that more power will help maximise its low frontal resistance - which is one reason why the Supra is king of the Texas Mile, despite other more powerful V8s and V10s competing. Edited January 10, 2010 by sdistc (see edit history) Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 10, 2010 Share Posted January 10, 2010 How long was the stopping distance after 2 mile? It's hard to say, when you're travelling at 180mph it goes past pretty quick , once I had passed the timing beam I pretty much had to jump straight on the brakes & brake as hard as I could & scrubbed enough speed off to take the corner at the end. My mates 996 TT stopped better on stock 996TT brakes, but I guess they are ducted & with the engine in the rear his braking force will be distributed a bit more evenly across the 4 wheels, with mine the biggest problem was they were starting to fade Quote Link to comment Share on other sites More sharing options...
Lee P Posted January 10, 2010 Share Posted January 10, 2010 I have asked for a place, I should pass the noise test with my bung in. Will have to wait and see. Quote Link to comment Share on other sites More sharing options...
johnny g Posted January 10, 2010 Share Posted January 10, 2010 What makes you say that? The Supra has a pretty slippery friction co-efficient at 0.32, better than a lot of modern sports and supercars (for comparison, the Veyron's is 0.36 and R35 GTR is 0.27 linky). It is a big fat car though, which means that more power will help maximise its low frontal resistance - which is one reason why the Supra is king of the Texas Mile, despite other more powerful V8s and V10s competing. The fact that Jay's mate with less power made similar Vmax in his 911. Caymens too. They channel the underflow of air much better, the Supra is nigh on 20 years old by design and can't compete, realistically with current sports car aero. Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 10, 2010 Share Posted January 10, 2010 Someof the cars that were there when I went were louder than mine & there was supposed to a be noise restriction then too Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 10, 2010 Share Posted January 10, 2010 The fact that Jay's mate with less power made similar Vmax in his 911. Caymens too. They channel the underflow of air much better, the Supra is nigh on 20 years old by design and can't compete, realistically with current sports car aero. There was defo something up with mine top end, aero may have had something to do with it (I had no undertrays on), but I don't think that it the whole story, this graph showed how mine was beating my mates until I hit top gear, then his took over Quote Link to comment Share on other sites More sharing options...
sdistc Posted January 10, 2010 Share Posted January 10, 2010 The fact that Jay's mate with less power made similar Vmax in his 911. Caymens too. They channel the underflow of air much better, the Supra is nigh on 20 years old by design and can't compete, realistically with current sports car aero. I agree with your sentiment, but it's often difficult for those without intimate knowledge of the two comparison cars to isolate aerodynamics as the sole reason for their different Vmax. Tyre size, height and compound; driver skills; car weight, setup, gearing and power delivery all come to mind as potential confounding factors. The other thing I thought of was that Vmax is one of the more accurate indicators of power - maybe the cars weren't as equal as first thought? Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 10, 2010 Share Posted January 10, 2010 I agree with your sentiment, but it's often difficult for those without intimate knowledge of the two comparison cars to isolate aerodynamics as the sole reason for their different Vmax. Tyre size, height and compound; driver skills; car weight, setup, gearing and power delivery all come to mind as potential confounding factors. The other thing I thought of was that Vmax is one of the more accurate indicators of power - maybe the cars weren't as equal as first thought? I agree with nearly everything there. That day I was running oversize rears, 295/30/19, I belive that is quite a way off stock sizes which I now run 285/30/18 (rolling radius wise). Also those Racing Harts I used to run were pretty heavy, I imagine it's exponentially worse to try & turn them at 180mph. I bet Caymans don't run heavy 19" rims Drivers skill is irrelevant IMHO, it's basically a rolling start & foot to the floor until the end, sure there's a couple of shifts but I dopubt it's enough to give an advantage Gearing is one which a believe is a factor, the Supras 6th gear is LONG, longer than my mates 996TT, he can't pull 200 in theory whereas the Supra can (on that day with the bigger tyres I recall my max speed was in theory 220mph) Quote Link to comment Share on other sites More sharing options...
johnny g Posted January 10, 2010 Share Posted January 10, 2010 Also heatsoak was an issue, wasn't it, Jay? Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 10, 2010 Share Posted January 10, 2010 Also heatsoak was an issue, wasn't it, Jay? It certainly was, one of the hottest days, I had to push mine down the queue as it was overheating when stood, all the Porkers were sat there with their A/C on inching along, I was sweating my tits off. Quote Link to comment Share on other sites More sharing options...
johnny g Posted January 10, 2010 Share Posted January 10, 2010 I still think the under-car aero is where your top end performance will improve, though. Or you'll need a lot more power, as drag squares with speed. Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 10, 2010 Share Posted January 10, 2010 With the 4 Row the OEM undertray won't fit, custom front & engine undertrays are on my list of things to do definately Quote Link to comment Share on other sites More sharing options...
johnny g Posted January 10, 2010 Share Posted January 10, 2010 AAS? You going fror a flat underside? Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 10, 2010 Share Posted January 10, 2010 Nope, just replacing the stock items with something that fits Quote Link to comment Share on other sites More sharing options...
Sharpie Posted January 10, 2010 Share Posted January 10, 2010 I wonder what a 560bhp supra would be capable of..... http://www.mkivsupra.net/vbb/showpost.php?p=347878&postcount=6 Quote Link to comment Share on other sites More sharing options...
johnny g Posted January 10, 2010 Share Posted January 10, 2010 Nope, just replacing the stock items with something that fits DIY job? Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 10, 2010 Share Posted January 10, 2010 Probably Quote Link to comment Share on other sites More sharing options...
sdistc Posted January 10, 2010 Share Posted January 10, 2010 well, I'm certainly interested in evaluating the difference between undertray and no undertray on Vmax! It's definitely one thing we gloss over with Supra modification. Quote Link to comment Share on other sites More sharing options...
michel lane Posted January 10, 2010 Share Posted January 10, 2010 Hmmm, just seen there is a driveby test at 87.5 dba. Might get one run in, im now thinking thunder road might be a better day, that opens in a couple of weeks, ill post in here when open so be quick if you want a spot. I am intrested in this, keep me posted please. Quote Link to comment Share on other sites More sharing options...
hodge Posted January 11, 2010 Share Posted January 11, 2010 Jay let me know when your having a to at this undertray. I wouldn't ming getting involved with this abit. Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 11, 2010 Share Posted January 11, 2010 Sure will Quote Link to comment Share on other sites More sharing options...
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