Dyno results - Elf vs Powercard

[Serpico]

I'd call it tie!

A/F ratio was about 12.5 across the rpms. That was post cat , so I'm assuming pre-cat would be close to 12:1.....good enough for me.


I was about .5 richer after adding the Walbro 255 and fixing the small vacuum leak I had on the Elf connection.

No pinging!!!!!

Ambient temps are back in the mid 70s and 30% humidity. Perfect weather IMHO.

I lost about 2 hp, and I think that's because I'm not running as lean.
Overall I'm happy where I'm at......for now... :wink:

I see a big throttle body, Powercard Pro and 5th injector in the distant future. That should put me close to 200whp.

Tom,

Thanks a bunch for the use of the powercard. I'll send it (and the pulley) back first thing Monday morning.



http://upload4.postimage.org/840214/ElfvsJRPC.jpg (http://upload4.postimage.org/840214/photo_hosting.html)

[chuckerants]

Did the dyno operator give you the actual dyno run files?

Also, you definitely need the BTB. With it and the e-cool, I was able to make the 202HP using the 110mm pulley.

[Serpico]

I don't have them , but they are posted online and I can access them if I need to.

First I have to learn how to use the software that reads the files.... :?

[chuckerants]

Did you disconnect the exhaust at the cat con to see if there was any difference in HP?

Also, you are running 94 octane right?BTW, the Dynojet software is pretty easy to use. Just play with it a little. I was even able to use the software to figure out that my clutch was slipping by using TIME as a plot point.

[Banshee]

So you're finally going to take my advice and get the BTB?

[Serpico]

I'll mess around with the software and see what I can learn.

I didn't disconnect the cat, but what I did notice is that I was down maybe 2 horsepower from last time at the dyno and my peak boost was up about 1/2 pound.....that tells me the cat could be clogging.

What I want to know is will a high flow cat ( such as the roadster sport midpipe) clog up just as easily as the OEM one?

BTW, I'm still on the stock clutch, so it's probably next on the list to be replaced.

God, will it ever end now????? :lol:

[Banshee]

was that A/F with the elf all the way at 10?

[Serpico]

So you're finally going to take my advice and get the BTB?

Eventually... :)

1.Clutch
2. Midpipe
3. Wideband O2
4. BTB/ E-Cool


I guess MAKE MORE MONEY should be #1

[Serpico]

was that A/F with the elf all the way at 10?

P1-10
P2-0
P3-10
P4-not connected

[chuckerants]

FWIW, the P3 on my ELF is at 5 or 6 (recommended 8) with the e-cool provding the rest of the fuel and the cooling of the intake charge.

As for the clutch, at 187 HP, your stock clutch won't last very long. I thought mine would last a while since I don't abuse the clutch very much, but I was wrong. Now I have a Spec stage 2 and love it.

As for a hi flow cat, from everything that I've read, aftermarket cats are TWO stage whereas OEM is THREE stage and they do not last as long as OEM cats.

The BTB was a HUGE improvement. I was amazed when i first drove it after we installed it at Tom's house. :D

[Serpico]

" I was even able to use the software to figure out that my clutch was slipping by using TIME as a plot point."


so how did you figure that out????



In regards to the cat clogging, Can all of us that are running superchargers expect to replace the cat periodically? Is it always in a steady state of clogging up? I'd hate to spend $300 on a midpipe only to have it clog up as well.

[chuckerants]

On the Dynojet software, people usually have the HP on the left main graph, Torque on the right main graph and a small secondary graph on the bottom for A/F and engine speed.

All you have to do is to do is to replace the engine speed with TIME. See below.
http://www.chuckfullobeans.com/images/hp/miata/ClutchSlip070606.jpg

Notice how Run 36 took 2 seconds LESS to redline than Run 51? That's one of the reasons why I wasn't able to make the same 202HP after that run.

" I was even able to use the software to figure out that my clutch was slipping by using TIME as a plot point."


so how did you figure that out????



In regards to the cat clogging, Can all of us that are running superchargers expect to replace the cat periodically? Is it always in a steady state of clogging up? I'd hate to spend $300 on a midpipe only to have it clog up as well.

[chuckerants]

In other words, due to clutch slip, the car took 2 seconds longer to get to redline and was never really able to transfer the engine power to the wheels.

It also helps if you are consistent in your dyno runs. For example, I get the car in 4th gear, then at 2500 RPMs go WOT every single time. Otehrwise, my TIME graph would not be such solid evidence of clutch slippage.

We also did this graph with Ari's car and showed the same clutch slippage.

[99mx5]

Yup, same deal. I also did back to back runs with the ELF and powercard and they were also identical.

[chuckerants]

Yup, same deal. I also did back to back runs with the ELF and powercard and they were also identical.

So much for the 10HP improvement from the PC -> ELF.

I wish I had done a dyno run with my PC before I replaced it with the ELF. :(