FGX XR6T Sprint Dyno review.

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Hi HSE2

If you believe you've got enough data, how many cars were fully on TOB and if you've seen all the sheets was there enough info on the Dyno sheets for you to be confident that they either were, or were not, fully on TOB? Do you know how much average slip was involved? Say the average was 6%, well if we had an average power figure of 250 RWKW's then wouldn't that be pushing the average RWKW figure down by about 15 kW?

Also have you thought of the possibility that some tuners may not try too hard to make sure they got full TOB and absolutely maximum power in baseline runs before tuning or modifying engines, or quite possibly they may not have known about TOB and how to get it operating fully. As I've indicated I know of one good tuner that was apparently never seeing TOB in pre tune runs and I'm sure that wasn't deliberate.

On the points of slip and reverse engineering the numbers. Aren't we both reverse engineering? And if my attempts are comical and I'm addressing the slip problem (which can be significant) in the assessments that I've made, then I'm wondering who has the most comical approach.

I'm inclined to agree that your 65-70 kW loss estimate seems to often be the case on these cars and that suits me fine, it makes my stock car look good at 327 Flywheel killowatts and other stock FG Turbo Dyno numbers that I've mentioned also look good (with the exception of the Police car that, according to what I've been told by a highway Patrol officer, should have been running on 91 fuel).
On TOB being worth no more than 20 kW (that would be 7.4% and I was thinking it might be around 10%), I can't say you're wrong, but note that I haven't even suggested that the 270 and F6 engines had 40 kW in the overboost like the 335kW Miami's, I can't understand how you seem to have got that idea.

On your point that "the numbers, in the case of the Sprints have been given to us. They are not a mistake and they are from the same manufacturer."

Yes, I agree fully and don't doubt Ford's numbers at all, I'm assuming they are right.

So the bottom line to me is that I'm taking the least comical approach, I've got a car that is totally stock and untuned, also Dyno sheets that show very good power numbers with the standard boost and AFR numbers, my Performance Box has been used on another stock car which had equal rolling pace, I've seen evidence of other cars on the net delivering similar performances to mine, plus I've got both Dragstrip and Performance Box data to prove what I'm saying.

And finally the gar has managed a Performance Box measured 4.53 second time to 100 km/h in 71.28 metres with 60 km/h being reached in 2.20 seconds at 19.36 metres, which backs up the Dyno numbers.

That's a fact.

And yes I'm thinking we should get back to talking about Sprints, not F6's and 270 kW Turbo's.