Dyno'd my new 8
#1
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Dyno'd my new 8
Seeing as compression testers are difficult to come by where i live, and i know a guy with a dyno i decided to get the dyno'd as after a bit of reading this seems like a fairly decent way to see the condition of your rotary. The car got 213hp at the wheels. but according to the dyno man this figure is between 8-10hp + what it should be, as customers seem to prefer a slightly higher reading. i didnt put this up in the dyno thread as its not sae correct or whatever it is. im getting the graph mailed to me mid next week, so il post it up here. i do remember there being a slight dip in power at around 7k rpm but i think this may be something to do with the extra ports of the 231 opening up. Any way is this a fairly decent figure? after trolling through the dyno thread it seems as though anything above 200 seems to be acceptable.
#3
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It is difficult to make any statement on engine health based on this number without a proper frame of reference. Indeed the number itself seems to indicate good health, but to really make a statement would require that we understand what that dyno is reading relative to others. You mention that "according to the dyno man this figure is between 8-10hp + what it should be, as customers seem to prefer a slightly higher reading" - does this mean that typical, stock RX-8s are reading 8-10 hp higher than yours on that dyno?
#4
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It is difficult to make any statement on engine health based on this number without a proper frame of reference. Indeed the number itself seems to indicate good health, but to really make a statement would require that we understand what that dyno is reading relative to others. You mention that "according to the dyno man this figure is between 8-10hp + what it should be, as customers seem to prefer a slightly higher reading" - does this mean that typical, stock RX-8s are reading 8-10 hp higher than yours on that dyno?
#5
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I have seen fairly new low mileage 8's dyno in the 190WHP range. Dyno results are kind of useless if you don't know what other 8's have put down under the same conditions on that dyno.
#7
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yeah you have a point if no other 8's have been dynoed on this dyno (as far as i know). i dont know if the higher octane fuel we have over here in europe would effect those dyno numbers though brettus. i was just using this as piece of mind, knowing that low compression motors seem to get alot lower numbers.
#8
Boosted Kiwi
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A better way to analyse your dyno would be to compare the shape of the curve with others in the dyno thread .
#9
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its the UK. they "correct" everything to flywheel numbers. they never give a "wheel" number. this car, judging from past rolling road UK dynos, is probably in the normal 180-190 wheel numbers for a stock 8 in good working condition
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#11
I HATE SPEEDBUMPS!
#12
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yeah it was a cold day about 1-3 celcius, no he did have a flywheel number but i wont get that till later on in the week when i have my next lecture. i do remember him saying specifically that this number was at the wheels, il have a look at the dyno thread though to compare figures. but i would still think 175hp is pretty low? these cars are supposed to be 227 from the factory right (at the crank) thats a 52hp loss.
#13
BECAUSE RACECAR
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The number from the factory is a lie. Just gotta deal with it. Only reason the numbers are so high is because the guy running the Dyno has it rigged and it's not SAE corrected. My guess is you're more in the 170-180 range.
My car made 174RWHP untuned and running pig rich with all my mods. Should be able to get to the 195 range after it gets tuned but that's about it. See VBGarage link in my sig for the list... kind of sad.
My car made 174RWHP untuned and running pig rich with all my mods. Should be able to get to the 195 range after it gets tuned but that's about it. See VBGarage link in my sig for the list... kind of sad.
Last edited by Arca_ex; 02-06-2012 at 08:23 AM.
#19
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you guys are right, i spoke to a dyno pro yesterday who spent lots of time trying to get his dyno to correctly read the rx8's horsepower. but he said theyve all dynoed between 165-190 at the wheels, And that none that hes dynoed have ever made the 227 (flywheel) claimed by mazda. Its a shame really that they'd advertise it as that. But its still great car.
#20
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I've had more than a dozen specimens pop up over 200 with no modification or tuning.
As you might expect, those cars made minimal gains with tuning alone.
Not "normal", just typical. "Normal" would be about 190, which is where the majority of healthy, stock RX-8s have landed.
#22
Boosted Kiwi
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Not impossible, just not typical.
I've had more than a dozen specimens pop up over 200 with no modification or tuning.
As you might expect, those cars made minimal gains with tuning alone.
Not "normal", just typical. "Normal" would be about 190, which is where the majority of healthy, stock RX-8s have landed.
I've had more than a dozen specimens pop up over 200 with no modification or tuning.
As you might expect, those cars made minimal gains with tuning alone.
Not "normal", just typical. "Normal" would be about 190, which is where the majority of healthy, stock RX-8s have landed.
https://www.rx8club.com/series-i-tech-garage-22/dyno-results-compilation-77031/page8/
yielded theses results :
Stock : 165,176,177,175,190,173,160,147,178
Modified : 188,181,200,181,186,186,187,213,189,200,198,196,19 4,190,190,184
This includes the 'best' results from the first socal dyno day .
#23