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iTrader: (1)

lol, classic ted response.
weeding out the dreams!

Snrub

iTrader: (1)

I'm not sure that there is a specific something that you can adopt from the Renesis to an older n/a 13B that will give you an improvement that will justify the cost. IMO the rest of this stuff relates back to my assertion of how one could to get closer to a Renesis and what lessons can be learned from the Renesis.

I know I'm going against the grain (and I could be wrong), but I do not buy the higher drivetrain losses (20% or beyond) from the RX-8. I think using a 17.5% figure makes sense because it bridges the gap between those who say 20% and those who say 15%. Uncertainties will be +/-5hp. I disagree that comparing rwhp is useless. If you use the middle figure and uncertainties you get a good picture of reality. If something varies beyond the uncertainties, then you can say something. That's why I'm saying something here about the RX-8 being overrated. I'll again mention the lack of sense in newer trannys and differentials becoming substantially more resistive based on the effort manufacturers put into miniscule improvements. If the difference was 25% vs 15% loss, Mazda would have been better off with the Type-R 5-speed and FD diff to get better performance and fuel economy from the Renesis.

dDuB, I'm not sure what you are refering to by "correction." Maybe I'm wrong, but I've seen multiple RX-8 dynos approximately meet the figure I quoted and a few S2Ks fit into the example I gave. I didn't just picking a best/worst examples to fit my case.

ddub

SAE corrected depending on conditions/altitude.

Kahren

iTrader: (13)

the rx8s dont dyno well and i think this shoulnt be taken lightly, if you have ever driven an rx8 you can right away tell that the car does NOT feel like a 180whp car, it feels stronger then that. easy comparison would be an s2k. i am using an s2k because the power output of both of these engines is very similar. the acceleration of these 2 cars is very similar the rx8 is only a tad slower due to the weight diffrence. an s2k weights about 200 lbs less, which is about 15-20 hp diffrence. rule of thumb would be 100 lbs= 10 hp. most rx8s dyno at aroudn 180 whp. most s2k dyno at about 200whp. if these figures were correct the rx8 woudl feel much slower then it does. i strongly belive that the rx8 dyno less because of the fact that the ecu knows that the car is not moving and it tries to detune the car some for safety. i am still waiting for someone with an rx8 to take off teh abs sensors at teh rear wheels poitn them to somethign that ISNT moving and then dyno and see if the power output changes, this migh twork and might not. if the ecu checks for even more things then just the abs sensors then it would be even harder to fool it.

rarson

You guys are barking up the stupid tree. Seriously, the same car on the same day on the same dyno can read totally different. The dyno will read whatever the dyno operator wants it to read. The ONLY use for a chassis dyno is to compare back to back runs of the same car, on the same dyno (and some would argue on the same day, with the same operator). Correction factors are BS.

People need to stop looking at the dyno as a means of quantitative measuring. The real use of a dyno is a qualitative measuring of mods done.

Kahren

iTrader: (13)

i dont want to get in on the whole arguing about the dyno discussion. but dynojet roller dyno runs are very consitent and there is very little the operator can do. now if you take a dynopack type of dyno that is a whole diffrent story. get your facts straight.

RETed

Yeah, stupid **** like this turns into a drawn-out, lengthy discussion on a theoretical exercise.
I don't know of too many FC NA owners who are willing to spend $5k for an RX-8 motor and trans and then spend several thousands more trying to shoehorn the bitch into their cars.
Inevitably it turns into a shouting match or a flame war...which it has already degraded into, it looks like... :P


-Ted

NZConvertible

Was that measured on an engine dyno, or are those chassis dyno figures with someone's guess at drivetrain loss?

Icemark

You know what, you are right on that here Ted.

I think this waste of time thread needs to be closed. Go to the RX-8 forum if you want to discuss the theoretical outputs of the reni

Thread closed