Just curious, a good reason of why I wanted a RX8 was because it WAS naturally aspirated. I own a Mr2 Turbo, and to tell you the truth. They are a pain in the ***. To deal with, to worry about, and etc. I liked the rotary because (i'm pretty mechanically inclined) they are generally very simple.

The Mr2 however, is emo as hell.

How much is to be expected from a generally bolt on RX8 make roughly? I've done a search and couldn't find anything relevant to my question. just TURBO TURBO SUPERCHARGE SUPER CHARGE on this forum.

: ) thanks

 

not alot mate, 220whp max? if you tune it maybe 230

 

If you break 200whp you're doing great

 

i believe TEAMRX8 has the highest NA hp which is around 220
but i think most of his modification is custom

 

I believe some people have gotten close to 230 (with pretty much open exhaust). Many people get to around 210-220 with a cat delete and tuning... I would say 200 is the genuinely street legal cap.

 

That seems about right. Thanks a bunch. The 8 still has awhile left on its warrenty, i didn't really want to bastardize it any by adding mods to it quite yet when I have a Mr2 sitting around.

Thanks for the input!

 

suspension, open exhaust and throotle response is the most you can do i think?

 

We've dyno'd at 215rwhp and that's through some power-sapping high angle CV joints and a 20 year old van gearbox...

 

highest i have seen without addition ecu tuning is about 204 in a daily driver.
olddragger

 

Uh what?

 

lol there we go with the throttle response again!

 

It's not in an '8

 

The Evolve engine was rated at 280 hp back in 1997. I think with a stand alone engine management system 6 throttle body butterflies and some streetporting at last a really innovate header would yield 300+ hp!

/Lasse

 

I'm pretty sure I read somewhere that the theoretical absolute max. for the motor was around 260hp at the flywheel .....

 

Sounds about right; I think that was my math on someone's tuning thread....

Assume a VE of 100%; then figure it out.

VE of 1; RPM at 9000; displacement at 80 cubic inches; BSFC at .60

you can play with the BSFC if you want; but since we are all guessing anyway the point is how much air can this motor move in a perfect world at redline?

 

Someone on rx8 posted a dyno of 235 or 240whp a while back, can't remember who.

 

220 is highest seen on this site ....

 

Sounds like they had the dyno operator calibrate the machine to be overly optimistic. If you want to fudge a dyno result, you may as well just photoshop it instead of playing stupid games.

 

Mine is....heh

 

For now!

 

yeah 220 230 it about it for N/A

 

imo 230 is a bit optimistic, look more for ~210 range. Team's 219/220 was on a Mustang which is pretty unbelievable!

 

these people who hit these numbers... what are they doing? going as far as porting and all that expensive stuff right?

 

That was a peripheral port intake motor by Mazdatrix I believe

I think with some porting, tuning, and aggressive mods one could reach 230-rwhp but it wouldn't be too streetable.

Most people opt to go turbo/nitrous/super because it's cheaper per horsepower than going NA


Ok, I'll do it

I kept the Brake Specific Fuel Consumption at .60

I increased redline to 9400rpms

Gave the motor a VE of 98%

Operating at sea level (14.7) and 85 degrees

Mass Flow Rate (MFR) is 31.09 LBS/Minuet of airflow

ROUGH estimate of crank horsepower would be around 310.9 (MFR X 10)

More likely would be around 281-bhp

I would post the math but I'm tried as it is


Also, I guess I should have prefaced this with that horsepower numbers are all relative, anyways, especially wheel-horsepower due to so many variables. I would be more interested in track times, personally.

 

I would agree as real world performance value is really the big picture we are interested in, though since I am pushing an N/A setup and my nitrous is 6 months (or longer) out...this topic is of interest to me.

At least with regards to the accessport, there hasn't been any attempts to mess with timing. I'm looking to get some dyno time as soon as the weather here in Phoenix cools down.

I would really like to see 220whp N/A with intake, full exhaust, and ignition coil upgrades. I have smaller stuff like the agency power pulley and lightweight alternator and water pump pulleys as well.

Anyway, it's all talk at this point but once I have some hard numbers I'll be eager to share them.