NC DYNO: INTAKE, EXHAUST, MIDPIPE, HEADER, SUPERCHARGER!

miataman · Post by **miataman** » Sun Sep 24, 2006 12:00 pm

Thanks for the info!
Correct me if I am wrong, but best power & torque is achieved at a 12.2:1 a/f ratio.
At WOT you need the above ratio as stable as possible.
At part throttle and idle you prefer the stoichometric 14.7:1 ratio for better fuel economy.

yellowcoupe · Post by **yellowcoupe** » Tue Sep 26, 2006 5:40 am

Dear Brian,

perhaps i didn't read the post thoroughly enough, but couldi ask if the 2nd dyno with the midpipe change also included the RS exhaust+AEM? Or was it with stock intake and stock muffler with just the midpipe change?

tks

Post by **Brian** » Tue Sep 26, 2006 6:01 am

miataman wrote:Thanks for the info!
Correct me if I am wrong, but best power & torque is achieved at a 12.2:1 a/f ratio.
At WOT you need the above ratio as stable as possible.
At part throttle and idle you prefer the stoichometric 14.7:1 ratio for better fuel economy.

As noted, still 13/1 through the low and midrange so there is room to lean out "a bit" more if we had ECU control.

miataman · Post by **miataman** » Tue Sep 26, 2006 6:06 am

eManage Blue should be a good & cheap solution to handle some basic upgrades!
And then there is the eManage Ultimate if you want more versatility.

And it saves you the trouble going to a stand-alone ECU, which for road use will be a lot of trouble both to program and keep the engine running well in all sorts of conditions.

Post by **Brian** » Tue Sep 26, 2006 6:07 am

yellowcoupe wrote:Dear Brian,

perhaps i didn't read the post thoroughly enough, but couldi ask if the 2nd dyno with the midpipe change also included the RS exhaust+AEM? Or was it with stock intake and stock muffler with just the midpipe change?

tks

We added mods at each stage...did not subtract any.

RUKnight · Post by **RUKnight** » Tue Sep 26, 2006 5:02 pm

Brian is there any chance you could dyno the car with the header, rs and AEM intake and without the midpipe. I'd be curious if it had the same effect as earlier and just bumping up everything but the redline numbers or if in fact bumped up power at redline as well which i suspect. If you can't I understand as I don't know whether you have a dyno in the shop or not
Thanks
Mike

Post by **Brian** » Tue Sep 26, 2006 5:11 pm

It would be an interesting dyno and I will do it if we get the chance but I need to weld O2 bungs onto a stock midpipe to make that happen so don't hold your breath. We don't have the dyno here. The dyno is at local friends "Only Yesterday" which does VERY high end restoration work...original Cobras, Gt40s, etc. We take care of their often unusual tire mounting and balance needs (because our Steve Coe has been doing this since he worked for Dan Gurney's All-American Racers during both its GTP and Indycar eras.), and we get easy access to their incredible dyno setup.

GT Veloce · Post by **GT Veloce** » Wed Sep 27, 2006 9:26 pm

Brian, so I understand; the new stainless steel RoadsterSport midpipe has a high-flow cat and a bigger resonator, is that right? It (the RS midpipe) can be used with the stock header / cat assembly, or with an aftermarket header such as the DC Sports header.
BTW, are there any headers currently available for the "general public"?

Post by **Brian** » Thu Sep 28, 2006 6:02 am

You got it right on the midpipe. On the header, still no word on when officially available to the public.

v67gsr · Post by **v67gsr** » Thu Sep 28, 2006 9:22 am

Brian, will it be possible you guys make the mid pipe without the cat attahed (replace the 2nd cat with resonator) I am still waiting for a full cat-back system (no cat in mid pipe) release. I've been waiting long enough. I really like your exhaust but the only draw back is the lack of mid-pipe for the application.