Ophitoxaemia

other than a dry-sump, they claim the motor is stock.

what gives? (by which i mean the 255hp is more than the observed or rated power in an rx8)

and if they really make 255, can we make that too?

james

expo1

To quote the Diasio site " This engine is fuel injected and is controlled by a Microtech ECU, which is fully programmable."
255 HP can be done with that type of ECU and no concern for emissions or longevity.
Imagine how nice a 255 HP Renesis would be in a under 1,400 lbs car

Ophitoxaemia

aha, the print ad doesnt include that info.

that will be a fun car for sure. couldnt they also raise the red line to 11K (this is assuming the water pump limits the renesis) in a motor that doesnt need to idle for long?

james

N rider89

love this pic

09Factor

Put a Microtec 800 on a 4 port and you get 238hp on the stock injectors.
Larger injectors will give a little more power to a point.

But back to the main topic:
Mazda was cheap with the cat.

Better cat = leaner air/fuel mix = hotter EGT = afore mentioned Better cat = More fun for us.
Pretty certain that Mazda could have spent a lot more time into the tuning the maps. Which would have resulted in less fuel being comsumed (less emissions).

Lasse wankel

I think the engine can rew past 10 000 rpm becausse they have shortened the manifold. My stage 1 Renesis makes 238 hp@9100 with only better fuel.headers and some other small stuff.

/Lasse

brillo

no a/c, smaller alternator, ECU, better exhaust system, sure I bet you can hit 255.

Ophitoxaemia

if most rx8 motors are making about 210hp, thats a 45hp jump. id settle for half of that.

you can simulate a smaller alternator (and isnt the water pump a significant drag at high rpm?) with underdrive pulleys.

james

MazsportScott

James if thats the case you should call me, 1-800-538-9989...Scott

TeamRX8

iTrader: (25)

some people are pulling 200 hp at the rear wheels with the OE computer, seems reasonable

csdiasio

My name is Chris Diasio of Diasio Car Company. We do get 255 hp on an engine dyno with the Microtech ECU, and 218 hp at the wheels, done on Pettit's dyno.

As far as longevity, we reduced the dwell time of the injectors, and have had no engine-related failures yet. The engine is strong, and our car can stick with the Porsche GT3 Cup cars even on Sebring's long course.

However, I can also tell you that raising the rpms of the engine is not advisable. We have had a customer who ran his engine to 9600 rpms during several track days and ended up having a rotor bearing failure.

I do have a pdf available of the engine dyno if anyone is interested.

Email me at chris@diasio.com

Regards,

CS Diasio

swoope

iTrader: (5)

chris,

i chatted with you just a bit at the last club event at sebring... it was amazing as to what your car could do, but what are the exhaust restrictions you have to deal with???

beers

silverwolf

couldnt we duplicate these numbers. i figure they are not rearranging the whole engine. if we moded to what they are doing then we too can get this HP with little work. but that brings up the question. why havent we already.

09Factor

One of the reasons is cost.

For a M800 Motec to be used with the Renesis, a few problems must be overcome first.
1. Price for M800 3-4 grand.
2 only the stock water temp and the oil pressure sensors will work with the M800.
3 Cost and time of building the wiring harness.

We can get close with an aftermarket solution piggyback like Intercepter-X but most people don't have $1400 to drop like that.

silverwolf

well thats what i get for talking out of my *** and not knowing about microtech. oh well. still good job.

csdiasio

I think someone may be a little mixed up. The Microtech we use is the LT10S, and doesn't cost anywhere near what you are quoting. I believe you are speaking about the Motec units, which are very complicated and expensive.

As far as changes, due to the mid-engine configuration, our exhaust is totally different. To meet sound restrictions, we run two mufflers in-line, but as they are straight-through units, they are fairly non-restrictive. We run a custom airbox, and have a scoop to help get air into the system.

Chris

devious12

I've delt with Chris for some clutch/flywheel components and I have spoke to him over the phone on a few different occasions. I can tell you that he is a good guy, straight forward, and that he described the engine placement, exhaust, headers etc. to me over the phone because I had the same questions. I wanted to see about getting the header for the Renisis from him although, the way that Diasio has the engine mounted, gives them more room for the header on the engine, it would never fit on the Renisis the way the engine is mounted in our cars.

Either way, kudos to Chris for getting 255hp out of this engine!

zenmoused

Man.. 255 NA is impressive

Marietta 8

[QUOTE=09Factor]One of the reasons is cost.

For a M800 Motec to be used with the Renesis, a few problems must be overcome first.

2 only the stock water temp and the oil pressure sensors will work with the M800.

This is not true. MoTeC will work with any sensor and most run w/Delco or Bosch.
It is all set up in the calibration tables.

olddragger

iTrader: (3)

that hp figure will be available to the public probably this year.
olddragger

AdRoCK3217

The only reason no one has gone with a Microtech/Motec/Haltech on a daily-driven RX8 is just that..they are daily driven. Our PCM's control EVERYTHING...ABS, AC, PS, all of that. If you can live without any of those comforts, then you too could achieve these numbers, or higher..