That's very interesting Andrew. Not doubting your numbers or anything but the numbers from the Weltmeister dyno seem to be about 5hp down on other dynos around the UK - this observation (and I don't know if its right [
]) came from Steve Wong who I guess has seen a lot of dyno results from the UK. Regardless, you have great numbers. The vast majority of 3.2s seem to make 220-225hp, so you either had a very healthy engine to start with or the 5hp theory may have some truth. You got an extra peak 21hp and Ian got 16hp - Wayne is charging circa £500 and SW is USD350 for a custom chip. You pay your money and take your choice - we have had this debate on this forum before and Wayne has contributed and added to our knowledge base.
So what's the best you can get from a chipped 3.2? I would say Ian's 256hp must be close. Maybe Wayne could maximise the area under the curve a little and open up the midrange a bit with time spent on the rolling road but I doubt there is much peak power left on the table once you get to 256hp from a std engine. The rules are, how close can you get to optimum AFR and how far can you push the ignition timing without getting predetonation or pinging? Add to this, how much safety margin do you want for lower quality fuel? Colin at 9m is making 275hp apparently on his dyno with SSIs and aftermarket ECU and possibly bigger injectors - I don't know the details and I don't know what power he started with, though I believe it might be a freshly rebuilt and bluprinted engine. I am getting 260hp with cams and SSIs but have not had the chip changed yet. Alan, looking at the AFRs thinks I have another 5-8hp to come. He said the same thing looking at Ian's plot and SW found 16hp, so who knows where it will get to.
You start to be limited by a number of things as you get over 260hp. The std intake runners limit you to about 275-280hp and the exhaust will also limit things at some stage, possibly a little higher again. The heads are good for flowing up to 315hp apparently so they are fine. Std rod bolts and valve train limit you to about 6800rpm and std cams start to run out of puff at about 5400rpm (according to most dyno plots I have seen anyway). I think its safe to say that 250+hp on a std 3.2 is very good.
I know Wayne has great respect in the Porsche tuning community and with many racers and I would hazard a guess that he is the best in the business at chip tuning in the UK. Unfortunately, and this is just my experience, he is incredibly difficult to deal with. He is really bad at returning calls and emails and despite the fact that we had 3 cars (the maximum he is prepared to do in a day) ready and willing to pay in advance, he found it impossible to agree a date to come to London to tune the cars. This meant we would have to travel to his shop incurring the cost of a day off work plus the considerably travel costs. When I can get a custom chip in the mail in just a few days from SW and he will keep optimising it until its right at no further cost, and when Alan is charging £25 (£55 for me as I have additional complications to get good AFRs) for dyno runs, well you do the math. Still, I don't claim I have got a better result - I am waiting for the new chip!. I do know, however, that I have had a better customer service experience [
]. I know Wayne's very busy but I just didn't have the time or patience to work with him. As it was, I spent over 6 weeks trying to pin him down to a date. He was always very nice to talk to on the phone, but wouldn't commit to anything. BTW, this isn't meant to be a dig at Wayne, it just didn't work out for me [
]
Hope that helps somewhat.
RB
