Originally Posted by HDDP
Simon: A real head scratcher... I was starting to think we did something wrong when the car crapped-out at 5,075 rpm. I hope you can get an answer on this problem and we can both make full rpm runs.
This is good, now we have comparative dyno's that represent a completely stock car and one with some mods. I'll have to convert your torque #'s from Nm to Ft lbs though.
I've attached a photo of my dyno print-out including FAM #'s so you can compare. It seems we are reaching max hp & torque at about the same rpm, though the #'s are a bit different.
It's quite interesting... Though we have runs at nearly 20 degree different temps, you are showing slightly higher torque and I'm showing much higher HP at nearly identical RPM.
Did you get a FAM measurement ?
We did log AF and a load of other OBD stuff during the runs but in the limited time I had we were mainly focusing on getting a full range run. I will have a word with Gordon and see if I can get a copy of the data off his PC.
The comparison is very interesting like you say. All the indications are that I am bang on the stock 215 HP (running pump 95 RON). which would suggest that the AF is pretty close to ideal. Interestingly the power was the same even running an open intake on the second run, so I think most of your gains are coming from the exhaust, chip, and, as Intenseblu pointed out in an earlier post, the lean mixture. Of course the intake may be playing a part with the less restrictive exhaust.
As I am sure you'll agree I think it is far too early for people to start speculating on which mods are doing what. After all we only have about 4 runs between us (incomplete ones at that) 1,000's of miles apart, on different dynos, different conditions, and one car that we know for a fact isn't running at it's best. This really is just the start.
On the dyno front...
I did some more tests this evening on the speed sensor mods. and managed to recreate the 5,000 rpm limit by disconnecting the front speed sensors. I replaced them with 15K resistors but the ECU was still showing an ABS fault when I fired up again. I then found that the system needs to see all four wheel signals above 15 mph before it will clear the fault. My test was at standstill, so I need to have another go at it once I have a proper break-out connection on the CAB. Oh, and the pin-outs for the CAB connector in the Service manual are WRONG!
I'll do a proper update on progress on my website later and hope to have this problem licked by the weekend!