Here is a link to a guy in Canada that is tuning his ECU. Check out the last and second to last page in the thread. 24.5HP so far, but he says that is still a ways to go.



RX-8 Forum ECU results

"Baseline I get on a Mustang Dyno is around 178HP (cold) and about 172 after some runs and heat buildup"





so perhaps with the proper state of tune, it can make the power its advertised to have.



so the dilemma I see is this- there is no further power to be had.



A exaust on a N/A car built today would be lucky to see a 15hp gain, most see less then 10hp. So whats left besides internal modifications or some sort of forced induction?

A bit more info posted buy canzoomer:



"Yes, at certain levels.



The big problem is the newer emissions specs that say the car has to be running within spec in 5 minutes.



If we look at the rpm ranges over 6200 we see it running way too rich.

Same below 3750



In the mid range they are actually running it too lean, to heat up the cats.



The thing about the stock fuel maps that really surprised me was this midrange lean setting.



Going in we expected to see overly rich mixtures. As a result we hoped to gain higher rpm power.

When we discovered that the midrange was low, and we actually gained about 12 to 15 hp in there as well by enrichment it surprised us a lot!



In this they are likely leaning that range to ensure heating within 5 minutes to meet the testing requirements.



Anyway, no testing again until Monday. Burned out my coil packs on ignition testing.

Turned out that the Mazda coil packs are designed for a VERY short dwell and charge time. We were running them too long duration, and they melted!



Before they did we saw some interesting things. Pulled like a train. We were doiing our dyno runs in 3rd gear up to then, but we had to switch to 4th as we were actually running up the revs too fast to be easily controlled, and needed a higher gear to make the dyno tests less touchy. We were actually breaking the tires free in 3rd!



We are up an additional 12HP by raising the timing 1.5 to 2 degrees at 6200rpm and up. We are avoiding adding advance below 5,000 as that is the range you would risk knocking.

Although with the enrichment we added in the midrange it is still pretty unlikely..



That is 45+HP gained at 8000rpm, and most interestingly up 32HP at 5700, which is roughly the torque peak point. Torque was up 26 ft/lbs as well at 5700.



Out of all this we see:

Fuel controller alone will get us back the power we are missing.

In doing so we are still at levels to be legal in 48 states and Canada



With an ignition controller (I ordered in one with tunable charge and dwell timings!) we should be able to safely pull around 220-225HP at the wheels, which is probably around 260+ HP at the crank.



BTW, coil packs cost about $95 Canadian each.

sigh.."



I must say, I'm quite suprised he could pull that kinda power out of the Renesis just by tuning, things are looking up a bit https://www.nopistons.com/forums/pub...IR#>/smile.png



45HP! without an exhuast or an intake so far.



D-san

yah its surprising, you'd think in this day and age they would be able to get it tuned better



mike

Pardon my retarded questions, but I've never owned a car that I wanted to do this sorta thing to, but how difficult is this tuning stuff? I am just now getting some time to start studying up on it (yeah, busy busy busy. Matter of fact I am not even in the US right now and am planning on how to spend free time 3 weeks from now), but I have absolutly no idea whats involved.



Danke!

well it sounds like they have either hacked the stock ecu, or put on a piggy back of some kind



mike

they have a laptop running things, it says it in the post, not sure what

they are going to do next, leave the laptop there at all times?

link doesnt work... and im trying to show this guy proof who doesnt belive.

I just tested it, works fine.



Otherwise, look for this thread at the www.rx8forum.com



RX-8 Forum > Tech & Performance > The Tech Garage > Official word from Mazda on dyno'ing RX-8



That should get you there, go to pages 7-10



D-san

yeah the forum was down when i tried.