Minneapolis Posted March 26, 2022 Report Share Posted March 26, 2022 Our Team British American Racing BAR has run the BFG Rival 225/45-15 for the last 100 years with mixed results. Our car is a 2300 pound E30 with 15 x 8 wheels. This spring we are switching to the Hankook Ventus RS4 225/45-15 on the same 15x8 wheels. We won't have a chance to run a practice session before our first green flag so I'm looking for some advice as to what pressure we should use as a cold and/or hot starting points. I'll be happy to share what we ultimately settle on after our first event. If you're running the the Hankook RS4 225/45-15 on 8" rims , especially on an E30, I'd appreciate any input on hot or cold starting points. Thanks, Lee Quote Link to comment Share on other sites More sharing options...
wvumtnbkr Posted March 26, 2022 Report Share Posted March 26, 2022 (edited) Rough estimate on a similar weight rwd car that I have run those same tires on 15 x 8... Right around 34 hot is what we aimed for and adjusted from there based on laptime, driver feel, balance, and tire temps. This meant starting pressures of 27 psi on a "normal" race weekend.... meaning no snow OR asphalt melting. Edited March 26, 2022 by wvumtnbkr 4 Quote Link to comment Share on other sites More sharing options...
MichaelPal Posted March 26, 2022 Report Share Posted March 26, 2022 Used to run that set up on an e30. Ditto Rob’s comment and recommendation for a starting cold pressure. Quote Link to comment Share on other sites More sharing options...
wvumtnbkr Posted March 26, 2022 Report Share Posted March 26, 2022 Edit to add.... rs4 seem quite forgiving on higher pressures. Sometimes we get much more increase than we 3xpect. 40 psi would still be in the usable range imho. In other words, start around 28 or 29 and adjust after that first stint. 1 Quote Link to comment Share on other sites More sharing options...
obscene Posted March 27, 2022 Report Share Posted March 27, 2022 Is there an online retailer that has 225/45/15 back in stock yet? Quote Link to comment Share on other sites More sharing options...
MichaelPal Posted March 27, 2022 Report Share Posted March 27, 2022 1 hour ago, obscene said: Is there an online retailer that has 225/45/15 back in stock yet? I check tirerack weekly / daily. I’ve heard contacting hankook directly can have positive results. Quote Link to comment Share on other sites More sharing options...
wvumtnbkr Posted March 27, 2022 Report Share Posted March 27, 2022 Hankook Motorsports 1 Quote Link to comment Share on other sites More sharing options...
Gkuhn41 Posted March 28, 2022 Report Share Posted March 28, 2022 We ran those on a heavier car for the first 3 years, now on 245 rs4's. At Road America in particular we need to bump close to 40psi on the Left front to keep the center from wearing goofy. Our target is 38 fronts and 35 rear hot. They are super forgiving on pressure as was said we noticed it didn't affect times as much as wear patterns. We start @ 28 front and rear and will build more in the front so it works out. 1 Quote Link to comment Share on other sites More sharing options...
55mini Posted March 28, 2022 Report Share Posted March 28, 2022 On our really heavy Miata we start at 24-25 cold and build to 29-30 hot. They can go higher with no real issues to say 32. 1 Quote Link to comment Share on other sites More sharing options...
MichaelPal Posted March 31, 2022 Report Share Posted March 31, 2022 FYI... On 3/27/2022 at 4:13 PM, obscene said: Is there an online retailer that has 225/45/15 back in stock yet? RS4 stock is back in TireRack. Quote Link to comment Share on other sites More sharing options...
obscene Posted March 31, 2022 Report Share Posted March 31, 2022 Thanks! Quote Link to comment Share on other sites More sharing options...
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