Great to see a power curve on a forum! So many people claim various huge power gains through various means but the results are always subjective (it feels faster/more responsive etc) with promises to get to a rolling road and put up charts that never appear. I will try and post up curves for my 2.7 before fitting and after fitting the race cam from Augment. Originally tested at Superchips, the Porsche Club Motorsport appointed testing rolling road, at about 165BHP which was great in my view for a 90K motor. Weeps, yours will no doubt have been lower on account of the mileage, so great result from the Augtronic system and 85 Ethanol! Almost certainly 10+BHP up on original. Odd one about the 2.5 vs the 2.7 motors. Same cams and practically the same stated Orig BHP, and the 2.7 has larger valves. Talking to people that test cars a lot I understand that they have never seen a 2.5 motor produce more than 155BHP, kind of makes sense, could be that the 2.7 originally produced more power than Porsche claimed? With the race cam I managed 192BHP and a fellow competitor with the same setup but a fully rebuilt motor got a couple of BHP more. Can't recall what the torque figures were but will dig out the charts if possible.
With 192BHP I had to upgrade my injectors to S2 ones (803?) to achieve a good AFR so was interested in Roger's comment:
At Augment Automotive we felt that the performance of the standard engines left a little to be desired. Historically the 944 has not had many tuning options mainly down to the original injection system which is difficult to modify. (I've not heard or been told there's any issues with tuning the injection? Mines on stock 2.5 injectors and reached over 200bhp)
My standard injectors would not have been adequate for 190+BHP without running dangerously lean at the top end. Have you got power charts available for your car Roger? Wheel Torque and HP? Porsche Club Motorsport experience has shown that the way an operator comes off the power at the end of a test run makes a big difference to the apparent power. For 924/44 transmissions they consequently simply add 25kW (33 or so BHP) to the wheel power to ascertain flywheel power. Lots of people disagree, but that’s how they do it.
When we first ran the M62 supercharger with the standard crank pulley and an 80mm charger pulley (1.625:1 gearing) we only saw 2psi or so of boost but even that (with the race cam still in which with overlap isn’t the best for a boosted engine!) we got 202BHP. That would have made a great road car setup as it wouldn’t need an intercooler and would have great response from tickover and good torque. We needed more power so went for a smaller charger pulley to give 2:1 gearing. Needed to fit larger injectors again (Volvo). Got around 250lbft torque and 240BHP. But with that power from around 4000 to 6000 rpm, torque dropping as revs increased keeping power flat. That’s how I ran until the last event at Shelsley, for that we thought we might need more power to keep the 3.4 litre 911 at bay so upped the charger gearing to 2.1:1 and got peak torque around 272lbft and power of 267BHP flywheel estimated. With 228 at the wheels (so 261 in PCGB approach). Just found the chart for that so will have a go at uploading. Volvo injectors now on the limit and running leaner than I want at the top end, so need Turbo or other injectors now. I have never seen my exhaust glowing cherry-red before! Apparently quite normal on turbo setups.
That’s another benefit of the Augtronic setup, we can change injectors easily and do a "blanket” drop in injector times to get close to the correct AFR across the board. Can also use high impedance injectors which may mean I can find some OEM injectors that will fit the bill.
With 192BHP I had to upgrade my injectors to S2 ones (803?) to achieve a good AFR so was interested in Roger's comment:
At Augment Automotive we felt that the performance of the standard engines left a little to be desired. Historically the 944 has not had many tuning options mainly down to the original injection system which is difficult to modify. (I've not heard or been told there's any issues with tuning the injection? Mines on stock 2.5 injectors and reached over 200bhp)
My standard injectors would not have been adequate for 190+BHP without running dangerously lean at the top end. Have you got power charts available for your car Roger? Wheel Torque and HP? Porsche Club Motorsport experience has shown that the way an operator comes off the power at the end of a test run makes a big difference to the apparent power. For 924/44 transmissions they consequently simply add 25kW (33 or so BHP) to the wheel power to ascertain flywheel power. Lots of people disagree, but that’s how they do it.
When we first ran the M62 supercharger with the standard crank pulley and an 80mm charger pulley (1.625:1 gearing) we only saw 2psi or so of boost but even that (with the race cam still in which with overlap isn’t the best for a boosted engine!) we got 202BHP. That would have made a great road car setup as it wouldn’t need an intercooler and would have great response from tickover and good torque. We needed more power so went for a smaller charger pulley to give 2:1 gearing. Needed to fit larger injectors again (Volvo). Got around 250lbft torque and 240BHP. But with that power from around 4000 to 6000 rpm, torque dropping as revs increased keeping power flat. That’s how I ran until the last event at Shelsley, for that we thought we might need more power to keep the 3.4 litre 911 at bay so upped the charger gearing to 2.1:1 and got peak torque around 272lbft and power of 267BHP flywheel estimated. With 228 at the wheels (so 261 in PCGB approach). Just found the chart for that so will have a go at uploading. Volvo injectors now on the limit and running leaner than I want at the top end, so need Turbo or other injectors now. I have never seen my exhaust glowing cherry-red before! Apparently quite normal on turbo setups.
That’s another benefit of the Augtronic setup, we can change injectors easily and do a "blanket” drop in injector times to get close to the correct AFR across the board. Can also use high impedance injectors which may mean I can find some OEM injectors that will fit the bill.
