REDFC3S86

We all know N/A's run pretty rich stock....How much power can be gained by leaning out the AFR safely? I'm thinking about getting a rtek real soon. I'm just waiting for the newest version. I'd also like to get an idea of how much power i can squeeze out of my engine while maintaining driveability/reliabilty.....thanx!

tigerbite

I have heard people gain about 30 more horse by leaning out. That is just what I have heard.

REDFC3S86

Not bad at all!

*TOUCH*

iTrader: (29)

also not true at all...

AnthonyNYC

iTrader: (3)

If you're making 550HP and in the low 10's and lean it to 11.5 area I've easily picked up 30 HP.

RotaryRocket88

iTrader: (7)

550 hp is a little bit unattainable for a stock port / street port NA.

This thread shows before and after dynos from an S5 NA with a 2.0. AFRs were leaned out from 10-12s to low 13s. https://www.rx7club.com/rtek-forum-168/thumbs-up-s5-na-2-0-a-668832/. The images are broken, but a post by turbo2ltr links to them on the pocketlogger site.

*TOUCH*

iTrader: (29)

EXACTLY, we are talking about just leaning it out a little, aka everything else is stock. hell, even on a reasonably modded stock port na, 30 horses is an unrealistic gain for leaning out AFRs.

turbo2ltr

iTrader: (1)

Click "show dyno charts"
http://www.digitaltuning.com/index.p...age=2&ecu=S5NA

*TOUCH*

iTrader: (29)

well i guess i was wrong and here's proof!

RotaryRocket88

iTrader: (7)

Well, yes and no. Those charts show a 12.5 peak horsepower gain, but there's also significantly more useable torque above 6000 rpm. Hence the fact that peak horsepower was made at 6750 rpm instead of 5750 rpm.

rotarygod

iTrader: (1)

Of course for some reason his car was suffering from a very severe dip in power at 6500 rpm which isn't normal so much of his gain is fixing an issue. There is still a worthwhile gain though. He didn't even touch timing so more could be had from what he gained.