BMW B58 dyno results, 60–130 and quarter-mile times: M240i, M340i, M440i and more

Every car on this page runs Racebox custom tuning, so the fastest tune for a B58 (M340i, M240i, M440i) is the one matched to the turbos and fuel you have: Fastest B58TU tune (M240i, M340i, M440i), Fastest B58 tune (340i, 440i, M240i F22). The quickest B58 BMW on this board runs 9.00 @ 159.33 mph (a BMW M240i (F22, B58 Gen 1) on Speedtech manifold with PTE 7275 and E80); the quickest 60–130 is 3.64 s. Open any row for the sheet, the Dragy report or the slip and the full mod list.

On the Racebox board, stock-turbo B58 BMWs and Supras (same engine, so Supra sheets count here too) with downpipes and the Racebox custom tune make 395–435 whp on 93 octane depending on modifications and 470–515 whp on ethanol with direct injection only. The top one is a Toyota A90 Supra on stock turbos and E45 at 513 whp. All numbers are wheel horsepower, most of them off the Racebox Dynojet with the correction factor printed on the sheet. A hub dyno generally reads higher than a Dynojet (about 10% on the same car) and a correction factor can add up to 17% to a turbo car at altitude, so compare like for like: why hub dynos read higher and why correction factors lie on turbo cars. Every stock-turbo sheet is here, and this is the tune behind them: Fastest B58TU tune (M240i, M340i, M440i), Fastest B58 tune (340i, 440i, M240i F22).

Full bolt-on (FBO) means stock turbos with downpipes, intakes, cooling and fuel, so every stock-turbo car on this board is an FBO car. They make 395–435 whp on 93 octane depending on modifications and 470–515 whp on ethanol with direct injection only. The highest stock-turbo number is 513 whp from a Toyota A90 Supra on stock turbos and E45. On the street, the quickest stock-turbo quarter mile is 10.9 @ 124 mph. All numbers are wheel horsepower, most of them off the Racebox Dynojet with the correction factor printed on the sheet. A hub dyno generally reads higher than a Dynojet (about 10% on the same car) and a correction factor can add up to 17% to a turbo car at altitude, so compare like for like: why hub dynos read higher and why correction factors lie on turbo cars.

B58 cars on a Precision 6870 single turbo make 725–920 whp on the Racebox board, mostly on E85 and E80. The top one is a Toyota GR Supra (A90) on KLM Race 2-port turbo kit, Precision 6870 Gen 2 and E85 at 921 whp with a stock engine. On these turbos the quickest quarter mile is 9.008 @ 152.39 mph and quickest 60–130 is 4.20 s. Wheel horsepower off a Dynojet unless the sheet says otherwise; hub dynos and correction factors read higher, so compare like for like. Open any row for the sheet and the full mod list.

B58 cars on a Precision 6466 turbo make 715–820 whp on the Racebox board, mostly on E85 and E80. The top one is a BMW M340i on Spool top mount turbo kit, Precision 6466 Gen 2 and E85 at 821 whp with a stock engine. On these turbos the quickest 60–130 is 4.60 s. Wheel horsepower off a Dynojet unless the sheet says otherwise; hub dynos and correction factors read higher, so compare like for like. Open any row for the sheet and the full mod list.

B58 cars on a Precision 7275 turbo make 770–815 whp on the Racebox board, mostly on E80 and E85. The top one is a BMW M240i (G42) on BMR manifold with TurboSmart 7275 and E80 at 815 whp with a stock engine. On these turbos the quickest quarter mile is 9.00 @ 159.33 mph and quickest 60–130 is 3.64 s. Wheel horsepower off a Dynojet unless the sheet says otherwise; hub dynos and correction factors read higher, so compare like for like. Open any row for the sheet and the full mod list.

B58 cars on a Pure Turbos stock-location upgrade (Pure600 to Pure900) make 515–720 whp on the Racebox board, mostly on E70 and E45. The top one is a Toyota GR Supra (A90) on Pure Turbos Pure800 turbo and E70 at 722 whp with a stock engine. On these turbos the quickest quarter mile is 9.96 @ 138 mph. Wheel horsepower off a Dynojet unless the sheet says otherwise; hub dynos and correction factors read higher, so compare like for like. Open any row for the sheet and the full mod list.

Upgraded-turbo B58 cars on the Racebox board run from 515 to 1,101 whp. Stock-location and hybrid turbos (Pure Turbos stock-location upgrade (Pure600 to Pure900) and hybrid turbos) run 515–722 whp; single and top-mount turbo kits (Precision 6466 turbo, Precision 6870 single turbo, Precision 7275 turbo, Precision 7675 turbo and turbo kit) run 717–1,101 whp. The top result is a Toyota GR Supra (A90) on BMR manifold with TurboSmart 7675 and E80 at 1101 whp on a built engine. Wheel horsepower off a Dynojet unless the sheet says otherwise; hub dynos and correction factors read higher, so compare like for like. Every upgraded-turbo sheet is here.

The highest B58 BMW dyno result Racebox has published is 912 whp from a BMW M240i (G42) on Extremeturbosystems 6 port turbo kit, Precision 6870 gen 2 and E85. Stock-turbo B58 BMW results on the board run from 422 whp to 502 whp depending on fuel and supporting mods; the top stock-turbo number is 502 whp from a BMW X5 40i on stock turbos.

The car was tuned by Racebox on the street or remotely with datalogs and never put on the dyno, so there is no power number. The 60–130 or quarter-mile time still comes with its Dragy report or timeslip.

Stock means the factory turbochargers. Stock-location hybrids, drop-in upgrades and full turbo kits are all listed as upgraded turbos, so the stock-turbo filter only shows cars on the turbos they left the factory with.

Racebox dyno sheets are Dynojet printouts, and the correction factor is printed on the sheet you see when you open the result. Dyno graphs from customer and partner posts are listed as posted.

Only like for like. All numbers are wheel horsepower, most of them off the Racebox Dynojet with the correction factor printed on the sheet. A hub dyno generally reads higher than a Dynojet (about 10% on the same car) and a correction factor can add up to 17% to a turbo car at altitude, so compare like for like: why hub dynos read higher and why correction factors lie on turbo cars. When two shops disagree, trap speed and 60–130 time settle it, which is why every car here carries its track numbers next to its dyno number.

Elapsed time is what wins a race, so the boards rank by ET and call the lowest ET the quickest. Trap speed is available as its own sort for anyone comparing power at the top of the track.

Racebox customers can submit directly: sign in with the email you ordered your tune with at goracebox.com/pages/submit-result and send the dyno sheet, Dragy report or timeslip with your mod list. Every submission is checked by hand before it is listed, and customer names are never shown. You can also tag @goracebox on Instagram.