It looks fast too!
#561
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Join Date: Sep 2008
Location: Arizona
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I just wanted to add a quick comment since I put a couple of thousand miles on the gernpipe...still waiting for my torque graphs from autowave and the holiday probably has something to do with the delay.
The benefits are not just at WOT, this changes the way the car drives normally. At around 3700 to 4k rpm at any amount of throttle, the tone of the exhaust changes and the car pulls much harder. I think the tone change sounds like a tuned pipe on a 2stroke engine when it hits that certain rpm...and it doesn't have to be on high cam and heavy throttle.
I'm still interested in hearing feedback from the other 5 independents :-)
The benefits are not just at WOT, this changes the way the car drives normally. At around 3700 to 4k rpm at any amount of throttle, the tone of the exhaust changes and the car pulls much harder. I think the tone change sounds like a tuned pipe on a 2stroke engine when it hits that certain rpm...and it doesn't have to be on high cam and heavy throttle.
I'm still interested in hearing feedback from the other 5 independents :-)
and while I think this gern-pipe is definitely worth the money for those with OEM'ish setups, I'm really interested how this reacts with head work and cams. I'd hope to see some mid range gains over typical test pipe and typical 70+mm exhaust. Technically, it should work well. Adding a header that does even more scavenging, may or may not help with an mild NA setup. supercharged would be another story.
#562
Former Sponsor
Thread Starter
I have been talking to a vendor about that, but no firm plans have been made. There would need to be lots of stars aligned to make it happen. The hard part would be finding a manufacturer that could build it at a reasonable price without requiring large production quantities.
#563
Former Sponsor
Thread Starter
@jh4db536 - Thanks for the additional feedback! I'm glad you are enjoying the pipe.
@berny2435 - You are correct that the physics behind the Gern-Pipe are the same as those for 2 cycle expansion chambers. However, the issue you mentioned about tuning from the engine down or from the exhaust back is not really relevant for this application. It's nothing like a single sylinder 2 cycle in that regard. Most of the gains from my mid-pipe are created by eliminating the plugging pulses that kill midrange torque.
@berny2435 - You are correct that the physics behind the Gern-Pipe are the same as those for 2 cycle expansion chambers. However, the issue you mentioned about tuning from the engine down or from the exhaust back is not really relevant for this application. It's nothing like a single sylinder 2 cycle in that regard. Most of the gains from my mid-pipe are created by eliminating the plugging pulses that kill midrange torque.
#564
Since the stock mufflers use unequal length pipes, left to right, would it not be better to have a custom y split made with equal length and possibly larger pipes to make for a nicer sounding exhaust?
Or does it not matter?
Or does it not matter?
#565
Former Sponsor
Thread Starter
The stock exhaust sounds fine with unequal length pipes, since the OEM mufflers completely eliminate drone. The owner that has the OEM mufflers and Gern-Pipe, pmptx, really seems to like the way it sounds.
#566
Registered User
Originally Posted by blade954' timestamp='1354062819' post='22175659
Since the stock mufflers use unequal length pipes, left to right, would it not be better to have a custom y split made with equal length and possibly larger pipes to make for a nicer sounding exhaust?
Or does it not matter?
Or does it not matter?
#567
Former Sponsor
Thread Starter
I started tinkering around with different intake designs over the past couple weeks, and have tested 5 prototypes. My goal is to find an intake that really compliments the torque curve from my mid-pipe. I don't have much interest in developing a new intake product, but figured if I build one that worked well, I would just look at the other intakes currently on the market to see which one was most similar.
Well, I think I've found what I was looking for, but there are definitely NOT any intakes like it on the market. I'm not going to share any pictures until I decide what I'm going to do with it, but here are the dyno plots from back-to-back tests. Green is my intake, and gray is my PWJDM.
Four pulls with each intake.
Averages of the individual pulls from each
Well, I think I've found what I was looking for, but there are definitely NOT any intakes like it on the market. I'm not going to share any pictures until I decide what I'm going to do with it, but here are the dyno plots from back-to-back tests. Green is my intake, and gray is my PWJDM.
Four pulls with each intake.
Averages of the individual pulls from each
#568
Registered User
Greg, You ought to see if Honda needs an engineer for a new S build.
Maybe you can help with the next gen S3000 and get it tweaked out of the box, or at least have a pre set package of settings for it to be maximized.
Maybe you can help with the next gen S3000 and get it tweaked out of the box, or at least have a pre set package of settings for it to be maximized.
#570
Registered User
Yes, you can, and some have, make the car smog-legal, get it tested and go back to your everyday setup, but then you'll need to be careful of these:
Our lovely road-side smog checks.
Welcome to Cali!