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Thread: Ford GT350R thread

  1. #361
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    Quote Originally Posted by emilio700 View Post
    They are as strong as a typical low pressure cast, flow formed, T-6 heat treated VIA approved wheel. Which is to say, pretty damn strong. Obviously not going to be as strong as a full carbon-fiber wheel.
    One design consideration on the GT350 wheel in particular is the unusually close proximity of the caliper to the barrel of the wheel. OEM GT350 is over built for TUV certification and has about .120 clearance. All 6UL wheels are designed with at least .120 clearance to target brake assembly
    The P6GR wheel we bent was only .090 when new. Considering how much wheels flex, particularly on a fast heavy car like the GT350, we felt that increasing brake clearance was prudent. So we did. Track wheels get bent, thats a fact of life.

    Max load rating for the OEM wheel and the P6GR is industry standard for that pcd, 680kg. We added 10% to that for the 6UL to 770kg. We hope to improve the useful service life of the 6UL on the S550 chassis when compared to other offerings.
    Load ratings don't tell you how much the wheel flexes.Its amazing how much camber compliance aftermarket lightweight wheels have compared to heavier OEM standards, and carbon wheels which are on a different planet in terms of stiffness.

    Track wheels get bent because they're not as strong and resiliant, nor meet the same impact standards that OEMs meet.

    For those who aren't wheel experts and manufacturers, here's a good read:

    http://www.fordnxt.com/project-cars/...ur-15-mustang/

    Forgeline have a 952kg load capacity for their competition wheels.


    Quote Originally Posted by fe4 View Post
    How much camber adjustability does the car have on stock hardware? How much did you get with the camber bolts?
    You can get to the factory -1.75* by grinding the knurling off the lower strut bolts, almost making them like crash bolts. That's what we've done in all the stest cars.
    Last edited by Stuntman; 11-16-2017 at 07:17 PM.

  2. #362
    http://www.trackhq.com/Banners/yellowsitesponsor.gif emilio700's Avatar
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    At WSIR today

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    Chest hair required Olitho's Avatar
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    Quote Originally Posted by emilio700 View Post
    At WSIR today
    Nice video and nice driving. Your camera position shows how bumpy it is in Turn Eight.

    My lines differ a bit. I am going to experiment with yours. I enter Turn Two a bit more mid-track and pull in the radius to the apex. Turn Four I run up high and again pull down on the apex. Turn Five I exit more mid-track. I don't run wide on Five on the so called "low HP" line, but I don't run as tight to the left either.
    To the right of The Sheriff. Isn't everyone?

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    http://www.trackhq.com/Banners/yellowsitesponsor.gif emilio700's Avatar
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    I was a bit conservative in T5. Not entirely grip limited in T6 so I could have tracked out T5 a bit more. T4-4A just taking the shortest distance, autocross style. Pros and cons to that line, more relevant to w2w than qualifying/TT.
    T2 is entirely grip limited so again, shortest distance wins. In an S2 Supermiata, we are severely power limited in T2 so it's driven more delicately so as not to over slow at any point. I also begin tracking out T2 sooner in a power limited car to reduce tire scrub. The GT350 is getting a teeny bit of power oversteer exiting T2 even if you are careful not to overheat the tires mid turn, so I exit tighter to open up the line more before going WOT.
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  5. #365
    Senior Member bellwilliam's Avatar
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    Btw. Thatís just a tad faster than Randyís time in a GT350R.

    Thought Emilioís is GT350. It has R-replica wing / splitter, R spring, R-replica aluminum wheels). so it is practically a GT350R (R also have resonator delete and carbon fiber wheels that Emilioís car donít have). Emilio is on the same tire, but rear is a tad narrower. He is using 305 squared (GT350R is 315 rear) because they were on sale (1/2 off).
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    http://www.trackhq.com/Banners/yellowsitesponsor.gif emilio700's Avatar
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    FWIW, William went .5s faster than me on the 305/325 Eagle F1 3R (ZL1 1LE tire). Where is that video?
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  7. #367
    Senior Member fatbillybob's Avatar
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    Quote Originally Posted by emilio700 View Post
    FWIW, William went .5s faster than me on the 305/325 Eagle F1 3R (ZL1 1LE tire). Where is that video?
    Man...you guys are killing it!

  8. #368
    Senior Member bellwilliam's Avatar
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    here is my lap....not great driving I know. my excuse is this is my first ever track session with this car and WSIR. T9 has always been my worst corner of ALL the tracks.....And I am used to Miata, so didn't even know what a sub 1:30 feels like.

    Top speed: 140 front straight, 136 back straight.

    T1 min speed - 88mph
    T2 min speed 90mph
    Omega min speed - 58mph
    T5 min speed - 67mph
    T8 min speed - 125mph
    T9 min speed - 98mph

    yes, I really bounced around a ton at T8.

    car is stock, except for camber plate (which I didn't need, because Emilio got the same negative camber with just camber bolts). narrower GT350 wheels (no, I didn't take Great Billy's advice on running carbon fiber wheels even though he said it is worth 3/4 second, they are sitting in my garage being admired). But most importantly I had 305/325 (stock is 305/315) Goodyear 3R tires (ZL1 1LE tires).
    this is a gummy tire, faster than stock Sport Cup 2 tire I am sure. I followed Emilio for a few laps, I was faster in corners. This car is super easy to go fast.

    looking at the data, I did lift briefly as I caught the 2 cars at T9. a driver with bigger ball (for T9) with clean traffic and right tire pressure (I ran ~7psi too high) is a 1:25 car if not faster. This car is a beast !!!

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  9. #369
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    Hard to say if the GY3R is faster than the Cup2 when it's 0.8" wider front and rear than the cup 2. A good 1.5" wider than Emilio's 305 R tire. It would be highly erroneous to draw any tire conclusion from that comparison.

    Running a 305 GY3R square setup vs a 315 Cup2 square would be a much more valid comparison.

  10. #370
    Senior Member bellwilliam's Avatar
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    Quote Originally Posted by Stuntman View Post
    Hard to say if the GY3R is faster than the Cup2 when it's 0.8" wider front and rear than the cup 2. A good 1.5" wider than Emilio's 305 R tire. It would be highly erroneous to draw any tire conclusion from that comparison.

    Running a 305 GY3R square setup vs a 315 Cup2 square would be a much more valid comparison.
    true. but another argument would be ZL1 1LE had better tires choices (including size). so if both GT350R and ZL1 1LE have same tires and sizes, GT350R will be faster. as Randy tested both - ZL1 1LE was only 0.2 second faster with 305/325 3R than GT350R's 305/315 SC2..

    but, Emilios tires are not the special GT350 spec tires either. We bought a bunch during last week's Walmart.com sale. $200 each (yeap, you read that right) for Sport Cup 2 305/30-19.
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    There's no arguing that the 1LE GYs are wider. It's difficult to tell which compound and construction is faster.

    Also keep in mind that the GT350 305 Cup2 is designed as a FRONT tire and isn't optimized for the forward drive loads of a rear tire.

    There are only 2 different 305/30-19 Cup2s. A Porsche tire (102Y) and the GT350 (98Y). You can look at the sidewall to see which one it is.

    Randy didn't run the 1LE against the 350R, he ran the base ZL1 and it was a flawed test. The GT350R is the faster car.

    Keep in mind, the numbe on the side of the tire (315) doesn't mean anything.
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    http://www.trackhq.com/Banners/yellowsitesponsor.gif emilio700's Avatar
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    Mine are 98Y GT350R spec
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  13. #373
    Senior Member e5pr1t's Avatar
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    Emilio's GT350 didn't have the larger rear sway bar either comparing to an R

    Quote Originally Posted by bellwilliam View Post
    Btw. That’s just a tad faster than Randy’s time in a GT350R.

    Thought Emilio’s is GT350. It has R-replica wing / splitter, R spring, R-replica aluminum wheels). so it is practically a GT350R (R also have resonator delete and carbon fiber wheels that Emilio’s car don’t have). Emilio is on the same tire, but rear is a tad narrower. He is using 305 squared (GT350R is 315 rear) because they were on sale (1/2 off).
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  14. #374
    Junior Member shindul's Avatar
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    Quote Originally Posted by bellwilliam View Post
    here is my lap....not great driving I know. my excuse is this is my first ever track session with this car and WSIR. T9 has always been my worst corner of ALL the tracks.....And I am used to Miata, so didn't even know what a sub 1:30 feels like.

    Top speed: 140 front straight, 136 back straight.

    T1 min speed - 88mph
    T2 min speed 90mph
    Omega min speed - 58mph
    T5 min speed - 67mph
    T8 min speed - 125mph
    T9 min speed - 98mph

    yes, I really bounced around a ton at T8.

    car is stock, except for camber plate (which I didn't need, because Emilio got the same negative camber with just camber bolts). narrower GT350 wheels (no, I didn't take Great Billy's advice on running carbon fiber wheels even though he said it is worth 3/4 second, they are sitting in my garage being admired). But most importantly I had 305/325 (stock is 305/315) Goodyear 3R tires (ZL1 1LE tires).
    this is a gummy tire, faster than stock Sport Cup 2 tire I am sure. I followed Emilio for a few laps, I was faster in corners. This car is super easy to go fast.

    looking at the data, I did lift briefly as I caught the 2 cars at T9. a driver with bigger ball (for T9) with clean traffic and right tire pressure (I ran ~7psi too high) is a 1:25 car if not faster. This car is a beast !!!


    What Camber bolts did you use?

  15. #375
    Senior Member bellwilliam's Avatar
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    Quote Originally Posted by shindul View Post
    What Camber bolts did you use?
    It is BMR. But since I have camber plates. There really is no need for the bolts.

    Actually I am thinking of removing camber plates and using camber bolts only. By doubling it, one can get over -3
    Last edited by bellwilliam; 12-23-2017 at 02:31 PM.
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  16. #376
    Senior Member bellwilliam's Avatar
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    1:21.80 at SOW CCW. in traffic, passed 4 cars (had to lift / move offline with 3 of them).

    Tires: 305/325, Goodyear 3R (OEM ZL1 1LE tires) on GT350 aluminum wheels

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  17. #377
    Chest hair required Olitho's Avatar
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    Nice lap William!
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  18. #378
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    Holy crap that is fast.
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    Nice lap! but passing me don't count as I politely moved out of the way for you
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  20. #380
    Senior Member bellwilliam's Avatar
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    Quote Originally Posted by colatkitty View Post
    Nice lap! but passing me don't count as I politely moved out of the way for you
    Thatís why I said had to lift/offline for 3 of 4 cars !!
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