Dyno Day
 

Is anyone gonna post the number their car ran on the dyno?????

Some people did on the other post.

Today. 383.14rwhp 305.6tq

Last year 408.8rwhp 304.6tq

Nothing changed. Boost and setup is the same as last.

A/F ratio's were turned down in the cruising map.

Now time to get her to run cooler.

RX8

Most power was 187hp with a K&N Typhoon

Least power was 157hp

Most were 167-175hp

FD

HEVNSNT = 234hp
r6FD = 212hp (lots of break up, possibly clogged cats)

N/A FC

Most power was 142hp

Least power was 96hp (Motor being swapped next week)

2 others at 117hp

1 @ 136hp

Turbo FC

Most power = IAN @ 383hp

Least power = 156hp (lots of break up)

Nismo = 239hp @ 11lbs

Lawyer's Spirit = 208hp @ 7lbs (Breaking up from 4.5k on)

FB

Most power = BASS @ 101hp

Darkfrost = 95hp (FPR problem)

Thanks for the info, I was curious to see the results. I would suggest that the guys who had break up check the a/f mixture, that was our gremlin, and once we found it, we gained 13 rwhp, and ran clean to 10,200rpm

Either that, or a buggered L-coil.
That was the culprit on my car at the Steve Kan tuning day last year.

Actually it was 99.5 hp ;)

I got 98.8 on my second run, by turning up the fuel pressure to 5psi (from 4.5). My regulator sucks though, I've already ordered a new one with a gauge to keep good track of my a/f ratio in the upper rpm range. I still cant believe my peak power is at 5200 rpm. Damn regulator.

Guys, I wrote that list from memory so don't be offended if I was off by a couple of hp. And I only put names of those had previously posted them or I was sure that they would not be offended. :bigthumb:

I think the 8 numbers were the most interesting. Even with the 10hp correction in 2004 I think Mazda still has some explaining to do. I was expecting the stock 8s to be in the 190s.

After talking my car for a run today I think I was actually at 6lbs of boost. I can't wait to resolve the breakup and then check the numbers again.

anyone get Ians on Video? I wanted t ohear it and I left right before he got on :(.

There were defintately a couple of cameras rolling all day, I'm sure they got it.

If the RX-8 is rated at 238 hp the correct deduction for accessories/driveline should be 20-25%. Wich would bring it in at around 178 - 190 hp depending. The day you guys ran with the high humidity would probably be another 5-8% off regular readings.

I had one, Dan had one and someone else had one.. I hope one of th elatter 2 got it and will post it..

Don't bother.
I'm sure his :fruit: :tear: :tear: would have overpowered any noise from his turbo spooling or his exhaust ;)

It's 142.24 to be exact!

I thought I read that the driveline loss on 8s was 17-20%, hence my expectation of 190s. But you are right it was damn hot.

Luke 'almost' got one of his runs and said he will try and host it somewhere.

Ya I was pretty disappointed with the 8's numbers as well (even though i only saw one and heard about the other two). It would've been nice to see how a turbo'd 8 would've done.

from what i recall it is very hard to dyno an RX-8, as are many sports cars these days.
i believe one magazine had to first disconnect the wheel/ABS sensors, or it would generate a limp mode of sorts.

timing is also aparently retarded if intake temps get hot, and under certain other conditions.

i think for the RX-8s it would be interesting to test a 0-60 run on actual road/track and then estimate HP based on weight, and compare that to the dyno...

You mean the other 5.

Haha crap..i missed all the FD's too. I was running on filipino time that day....damnit!!

I'm telling you, it's the damn stickers!

From what I've seen ~180rwhp seems to be what the RX-8 dynos at. eg. http://www.rx7.com/rx7rx8comparo.html I don't buy the "RX-8's don't dyno well" arguement. They're not BMWs with air speed sensors. Coldfire's suggestion seems to be that if the ABS sensor doesn't read properly, the engine backs the power off ~10%. I could see that being the case, but why back it off only that little bit?

If we wanted to do the HP estimation thing, compare the 1/4 or 0-60 numbers by the car magazines for the RX-8 (~14.5), FD (~13.5-13.9) and TII (~14.5-15.2). All are around the same weight, but the RX-8 typically acheives somewhere between the turbo 7s, but closer to the TII. Thus one would probably expect the RX-8 to be dynoing where it is.

IMO the RX-8 is still overrated at 238hp, it's more like 220hp. A lot of people don't like it when I say that and will argue that the RX-8 has 25% drivetrain loss, but I don't buy that.

I own an Rx-8 and wouldn't argue w/you on the HP issue.
Only thing I would argue is that she is still good bang for the buck. :)
and that Mazda has leaned it out and given it more power to bring it closer to what they advertised (238hp) originally even though they still may be a bit shy of the mark due to emission standards and other factors. So they are trying :)

I couldn't agree with you more I am actually trying to make my sister buy one so I don't have too. I'll just steal hers when I feel like it.

I just don't think Mazda came completely clean when they had the chance.

Hahaha. That marlboro sticker is adding to my drag!!