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I will post the full "Dyno" output once I have converted it into a suitable format, for now here are the most important figures:
Engine Power 247.7 KW / 336.8 BHP @ 8480 RPM, 206.4 km/h
Wheel Power 192.0 KW / 261.1 BHP @ 8480 RPM, 206.4 km/h
Torque 271.1 Nm @ 8480 RPM, 206.4 km/h
As you can see there was still 500 RPM to go before the max figures would have been recorded, the tuner reckons this would add +/- 15 BHP and 8 Nm more to the end results.
This would mean about 350BHP at the crank, 275 at the wheels and a torque of 280 Nm. @ 9000 RPM
We had some problems with the "Dyno" as in full automatic mode it did not believe the "VTEC / SC" kick at 6000RPM and kept aborting the run. The wheels actually spun and outran the "Dyno" at about 160 km/h in 5th. gear, and at about 210 km/h in 6th. gear. We tried about four runs but were unable to complete the program.
In the end we had to do a manual run taking measurements at every 500 RPM from 3000 > 8500, this was succesfull however the guy did not want to go beyond 8500 RPM, therefore I have to extrapolate the figures a little.
One other problem was, after about 1 hour on the "Dyno", running pretty hard, with two guys in the car and two on the boot things were pretty hot. I tried to reverse the car of the "dyno" but could not select reverse gear. It was not possible to de-press the gear shift to get it through the bridge, I was a little concerned to say the least. Anyway we pushed it of the "dyno" and as it was getting late I drove home, thankfully after a few hours cooling down in the garage the gearbox returned to normal.
That's about it for know, I'm pretty pleased with the results as apart from the SC this car is completely stock. I'll be posting the full "dyno" results shortly and I also have a movie of the testing which I will try to get posted as well.
Oh yes! one last thing the A/F ratio was good over the whole operating range which is good to know, it seems "Vortech" have the electronics sorted and I don't need to worry about the engine getting damaged by "knock".
Last time. Dynos dont just give you a HP number that is reliable. They are used for showing the differenence a mod makes. If you had a before and after someone could say whether you were making too little power. With only a single dyno to go by there isn't much you can draw from this.
I realise one dyno is not truly accurate, however if I look at previous dyno's on other peoples stock S2000 they all fall into a relatively small band around the 190 BHP mark at the rear wheels.
I therefor see no reason to believe my stock car is any different, so the readins I am seeing now reflect the increase the SC installation has added.
Also as described the power increase falls in line with what I had predicted.
My only concern is that the 75 HP loss in the drive train seems a little on the high side, it really seems to diverge above VTEC and boost. I would have expected the loss to stay a little more consitent across the power band.
If you are testing on a wheel dyno. The dyno computer has no way of knowing anthing but the wheel power. The engine number is only an aproximation that is derived from a formula.
275.5 hp and 175pounds of torque is right where mine came in. You're right on the money. They were tuning anothr S2k with the same set up but with 550 injectors and an AEM chip. He tuned out finally around 303hp. Thats making safe HP at around a 12.5 af ratio.
Originally posted by kstokell
Why do manufactures bother to qoute engine HP?
Because the number for engine HP is higher. It's no more complicated than that. They know that the average person has no clue about drive train loss, gearing, and vehicle weight effecting performance.
Dyno results with Vortech SC
