Dyno Report : GIAC DME Stage 3 Program on Boxster S

[clubhead]

Disappointing results again

Attached is the dyno graph. Folowing mods are on my car :
- Dansk Sports Cat
- Dansk Headers
- Dansk Sports Muffler
- Evo Highflow Intake

When I sent my DME to Evolution Motorsports, I told them I had the above 4 mods on my car. They told me the stage 3 program (Evo intake, headers & muffler) will be the closest fit and that they would load my DME with that program.

Evolution Motorsports took about a week to get the program in place as they claim my DME is different from those in USA so require some additional 'tweaking'. Not a terribly big problem as my car was in the paint shop anyway. Got my DME back last week and drove the car for about 10 days before heading down to the dyno today.

Blue line - Today's run with GIAC program with all the above 4 mods
Red line - Run with stock ECU and all the above 4 mods
Green line - Run with stock ECU, Dansk headers and sports cat

As you can see, the run with the best results (bar > 6,500rpm) is actually the green line. Meaning the muffler, intake and GIAC was a waste of money

There is a noticeable sudden dip in power/torque between 5,800-6,000rpm. This greatly concerns me. One of the reason suggested is a lean out which forced the knock sensor to retard timing. Damn it! I'm not tracking my car till this issue is resolved!

Objectively, the GIAC program did help in bringing back power to area lost when I put the intake and muffler on the car. But this recovery simply brought it closer or on par with the green line run. Meaning I would have been better off not putting on the muffler, intake and the GIAC program which cost me about $2,200!

My peak bhp is now even lower than before!!

Overall, I'm quite or very disappointed with the results. I shall be contacting Evolution Motorsports to get a refund since they have a satisfaction guarantee that comes with their GIAC program. But I will need to send my DME back to them again to restore everything back to stock and that means a week of no car again Either that or I have someone to fly down here and get the DME custom tuned for my car on the dyno... I'm seriously considering that option.

Any suggestions people?

[Brucelee]

Disappointing to say the least.

Keep us posted and good luck!

[cyclocross]

Did you dyno the unmodified motor with the stock ECU? If so, please publish that curve so we can make the comparison. Thanks.

[RandallNeighbour]

I keep reading posts on this forum and others that talk about how expensive mods are
for the Boxster and how little they do... I also read lots of sad stories like this one stating a
LOSS of HP after thousands have been invested.

Just proves to me that my stock engine with its stock intake, exhaust and ECU is the best I'm
going to get without a potential loss of cash AND power.

I'll save my pennies for a used 2005 S which I will buy in 2009 or 2010.
Sounds like a long time from now, but the older I get, the faster the years fly by and more
patient I become! I'll wait and get more power out of my next Boxster, which will be kept stock as well.

[Lux]

Wow. That really sucks. That dip in the 6K range is definitely not good. I still think that the parts have the potential to make good power. Obviously the tuning is out of whack. But how much out of whack is the question.

At this point, everything is a guess. You need cold hard facts to decide on a gameplan. I really think you need to get a proper air/fuel reading with your dyno runs. There's too many variables and guessing what to fix with 2/3rds of the info will only cause more frustration and a lighter wallet.



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[clubhead]

Originally Posted by Lux

I really think you need to get a proper air/fuel reading with your dyno runs. There's too many variables and guessing what to fix with 2/3rds of the info will only cause more frustration and a lighter wallet.
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I was going to do that but there's really no point. Even if I found that the car is running lean, there's nothing I can do about it. I don't have a program to alter the fuel/ignition map. And I can hardly just tell Evolution Motorsports that I'm running lean at certain rpm so please increase the fuel at that rpm.

Like I said, I'm probably going to revert to stock and get someone to do a custom map on the dyno... Only issue is $$.

[clubhead]

Originally Posted by cyclocross

Did you dyno the unmodified motor with the stock ECU? If so, please publish that curve so we can make the comparison. Thanks.

Nope. The basedyno I did was stock ECU with Dansk headers. You can do a search for that in this forum as I posted the dyno report as well...