| Building The Perfect Beast Part III, Tuning, Dyno Results & Driveability, Page 2 Paul Shaw Shares His Own Experiences |
| Time to drive the beast. Shawn had already advised me of smoking tires and very good driveability, based on hours of round-the-block testing. My impressions can be summed as follows. On the one hand, the car is a dream come true under constant acceleration and especially under full throttle. I’ve always regarded the E34 M5 as quick and responsive in first, but the additional surge of power in each gear, all along the rpm band seems immense. Pushed back in the seat, and hurtling the car forward, the power just keeps on coming, on and on, until the tach nears redline. There’s no noticeable drop in torque as HP takes over; both HP and Torque just seem to increase relentlessly in parallel. Torque in a stock M5, for example, falls from 282 ft/lbs at flywheel at 4000 rpms to 218 ft/lbs by 7000 rpms. In contrast, with the SC, torque hits 351ft/lbs at 4000 rpms, 365 ft/lbs at 6000 rpms, and is still at 349 ft/lbs at 7000 rpms. On the other hand, however, “drivability” seemed compromised because the engine would “chug” when slowing down or puttering around town at 2000-3000rpms. It took almost a month to purge the problem and involved incremental tests of a dozen different possibilities. Finally, the culprit emerged in the form of small reversions of air that confused the Mass Air Flow sensor, prompting fluctuations in it’s electrical signals that cut fuel. Shawn, an Einstein of tuning, neutralized the response with a three part menu of Split Second software, even larger injectors, and simple rotation of the MAF. When I picked up the car, I asked “Is my M5 happy”. Ryan tossed me the keys and said, “You tell us”. I was grinning all the way. |
| Proceed To: Building The Perfect Beast Photo Page View Return To The First Page Of The Introduction Of This Story View Please Read The Website's Legal Statement Regarding It's Content Contained Within View Bay Area M5's Main Index View |
| Dynoresults at 3.5psi - Paul Shaw’s Supercharged E34 M5 RPM Horsepower Torque (ft/lbs) Stock SC Gain Stock SC Gain 2500 104 130 26 218 270 52 3000 129 161 32 226 282 58 3500 154 216 62 231 326 95 4000 215 266 51 282 351 69 4500 230 304 74 268 354 86 5000 253 344 91 266 361 95 5500 273 385 112 261 365 104 6000 301 417 116 263 365 102 6500 310 452 142 250 364 114 6800 311 462 151 240 356 116 7000 290 465 175 218 349 131 |
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| M5 dyno summary results and conversions Rear Wheel HP: Stock 249@6800rpms; SC 372@7200rpms: gain = 123HP or 49% Rear Wheel TQ: Stock 213@5000rpms; SC 289@5000rpms: gain = 76 or 36% Flywheel HP: Stock 311@6800rpms; SC 465@6800rpms: gain = 154HP or 49% Flywheel TQ: Stock:266@5000rpms; SC 361@5000rpms: gain = 95 or 36% ** Con version of RWHP + TQ assumes a 20% drivetrain loss** |
| Click View or the thumbnail itself just above to take a look at a dyno graph of the the actual results achieved after tuning was completed. |