anyone intalled NHP full exhaust???

[23109VC]

i'll be anxious to see the results!!!

you have an S - my car is only a 2.7L base - 217hp...so whatever gains you see - i'll have to expect less.... lets hope you see massive gains!!

are you doing any kind of ECU flash or just bolting on the system? is your system the entire thing - headers/midpipes/muffler?

[Adam]

The parts look high quality and the tubing diameter is noticeably larger than stock. Definately interested in the results.

[2K3_Boxster_S]

Dynoed Today on a Dynapack, so there would be no questions about variables. there are no tension straps, no rollers, wheel spin, deflection etc.....

Dynapack info:
http://autospeed.com/cms/title_The-Dynapack-Dyno/A_0930/article.html

Video Results of my stock 2003 Boxster S:

http://s80.photobucket.com/player.swf?file=http://vid80.photobucket.com/albums/j179/ryancausey/boxterfinal1.flv&fs=1&os=1&ap=1



Looking at back on Dyno in 2 weeks Full NHP installed.

[23109VC]

can't wait for the results!!!! thanks for doing this - i'm sure I"m not the only one anxious to see the results. I'd also like to hear how it sounds.

aside from dyno numbers - I'd be interested in your subjective impressions as to how it seems to drive/perform - seat of the pants observations.

[Topless]

Yikes! Looks like a huge hole in performance at 4300 rpm. Low numbers for a Box S also. Bad MAF??? Spark plugs?? I have seen a lot of Boxster dyno results. Something looks very wrong here.

[stateofidleness]

i know nothing about dyno's and such, but 186hp on an "S"?
I thought my MY00 stock 2.7 was rated at 210hp... is yours low, or is mine high?

seems like the S should be putting out a lot more, even a stock one.

[edevlin]

Interesting stuff, keep the dyno sheets comming....

Ed

[2K3_Boxster_S]

Originally Posted by stateofidleness

i know nothing about dyno's and such, but 186hp on an "S"?
I thought my MY00 stock 2.7 was rated at 210hp... is yours low, or is mine high?

seems like the S should be putting out a lot more, even a stock one.

its horsepower to the wheels, not what the engine can make. Those numbers put my car around 250 hp.

[2K3_Boxster_S]

Originally Posted by Topless

Yikes! Looks like a huge hole in performance at 4300 rpm. Low numbers for a Box S also. Bad MAF??? Spark plugs?? I have seen a lot of Boxster dyno results. Something looks very wrong here.

nothing wrong with the car it runs great.

[2K3_Boxster_S]

Originally Posted by Topless

Yikes! Looks like a huge hole in performance at 4300 rpm. Low numbers for a Box S also. Bad MAF??? Spark plugs?? I have seen a lot of Boxster dyno results. Something looks very wrong here.

go put your car on a dynapack and lets see whats going on.

[Topless]

Here is another dynapack run with a bone stock Boxster S for comparison.
http://i4.photobucket.com/albums/y144/bisimoto/DeSnorked986S.jpg

Do you see what I mean about your cars hole at 4300 rpm(down to 140 ft lbs)? Peak performance is much lower on your run also. I am not here to burn you down. I just figure if you want to get a good baseline run before tuning your car it should look similar to other stock Box S runs to be valid. Looking at your numbers I suspect a fouled/contaminated MAF.

[Jake Raby]

Cool.. I consider the AFR data more important during this evaluation than the HP output... But then again, I average HP numbers before I even look at peak numbers, because peak is so very worthless unless you drive around at above 5,252 RPM ALL THE TIME.

[2K3_Boxster_S]

Originally Posted by Jake Raby

Cool.. I consider the AFR data more important during this evaluation than the HP output... But then again, I average HP numbers before I even look at peak numbers, because peak is so very worthless unless you drive around at above 5,252 RPM ALL THE TIME.

Porsche has had my car since Monday (AC service) I get home from work today (Friday) "hey your car's ready". Not sure if I can get this done before 7/19. If not it's going to be another month. (out of town again, for work). I could just bolt up the exhaust, but I want to do this the right way. and from what every one has said about the Dyno sheets, something doesn't look right. which is why I insist on re-dynoing it.

This could take awhile. oh well,

[2K3_Boxster_S]

Ok, It didn't get done. I'm out of town again. return Aug. 15. It will be dyno'ed upon return on a roller dyno with AFR readings. Then NHP exhaust will then be installed and re-dynoed on same dyno. Sorry for the wait. But I feel an accurate baseline is needed so we can know what effects of the NHP setup is going to give us. Please hang in there. THANKS

here is a quote from the person who dynoed right after my on the same dyno:

"Yeah I thought yours seemed a little low even for a stocker.. but as they said that dyno is stingy. Dunno, mine dyno'd 90hp and 50ftlb down from last time.. but .. different style dyno, different conditions"

So yeah I'm gonna find a different dyno.

later

[2K3_Boxster_S]

Originally Posted by 23109VC

i'll be anxious to see the results!!!

you have an S - my car is only a 2.7L base - 217hp...so whatever gains you see - i'll have to expect less.... lets hope you see massive gains!!

are you doing any kind of ECU flash or just bolting on the system? is your system the entire thing - headers/midpipes/muffler?

1. I am doing this at a 1 step at a time approach. (yes I will be altering the ECU maps, custom tuned. but later) The reason is I want to know as well as others whether Porsche has detuned the boxster through the exhaust or the ECU or quite possibly both. (Porshce did not want Boxter's threatening there 996 owners).

2. Yes, 1st stage is strictly bolt up exhaust that should determine if flow is restricted anywhere.

3. Yes it is Full NHP exhaust as follows:

Headers:
Equal Length primary piping, mandrel bend
Racing merge collector for primary piping
42mm primary piping vs. 36mm stock piping
200 cells sport catalytic converters vs 800 cells factory
2 inch exit pipe vs. 1 3/4" stock exit pipe

Mid Pipe Bypass pipes:
Completely removing rear CATS
50mm versus 40mm diameter

Exhaust:
304 Stainless Steel this muffler is a straight through pipe design
there are no internal baffles