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Discussion Starter #1
Hello All!

I picked up a Z125 a little over two months ago and put on the Comp Werks Exhaust, Chimera intake system, PCV with the auto tune. My question/concern is when riding with some of the other gentleman around the area with Z's they seem to have more power across the entire power band than I have, although they both only have an exhaust installed. I picked the closest map that PC offered (not a big selection) and have been accepting my tables and sending the maps from my auto tune which is set to 13.1:1. However every time I go to accept the changes It seems like it wants to take away fuel from the tune which is now ranging from -7 to -20 and almost no spots with positive fuel being added this just seems off to me as I figured with more air from the chimera it would need to add more fuel than all the maps which are running the stock air box. I know there is less air up here in colorado at 4300ft but I wouldn't expect it to be that dramatic. If anyone has an idea what may be the problem it would be greatly appreciated!
 

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Unless their bikes are being tuned exactly like yours(same pipe, same mapping, etc) there's likely some other differences between them. You should all be affected by your elevation the same, so unless there is a weight difference between riders, or your engine isn't fully broken-in, it's something else holding you back. You might want to talk to a local dyno tuning shop to see if they can offer some guidance or at least if the 13:1 AFR is what works best at your elevation. They also might be able to get more out of your combination if they dyno tune it or at least they may offer some more tuning suggestions. I'm at 1500 ft. and running from 13:1 to 12.8 AFR but as you mentioned I see a lot more fuel added across most of my PCV map. There was some richness just before the rev limit that is now gone but I've added fuel most everywhere else, as expected. Let us know if you find something.
 

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you have to keep in mind that the stock ecu pulls fuel on its own becuase the o2 is at a fixed voltage mainly to make tuning easier for the piggy back but over time it will trim it down thats an issue with piggy backs. it could be rich and thats why the power commander is pulling fuel away from it to get the air fuels straight so i would keep riding to get your air fuels in the right spot and then go from there. also what do your ignition tables look like? i hope this helps
 

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Discussion Starter #4
Thanks for the reply,
@lowbot. Both of their bikes are stock besides the pipes. One is running the yosh pipe (about 1k miles on the bike) and one has the pro circuit (about 150 miles on the bike). Both other riders weigh 20-50 pounds more than me. My bike has about 1300 miles on it at 3 oil changes so far. So I figure it's something with my bike. I'll look into a dyno but the closest to me is about 200 miles so it might be a while before I can take it there, I may lower the target afr to around yours in the meantime.
@wbrown I've had the pcv and auto tune on for around 600 miles at this point doing an update about once a week looking at the changes. I'll keep with it for now. I've just been concerned with it leaning out. I think the ignition advance is whatever came on my pcv at +2 to +4 in the high throttle positions. But looking through the forums people seem to have said +1 is about the best result on the dyno so I may change it down.
 

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Hmmm. I just had a closer look at the pipe you have and I wonder if it isn't a factor. Both the Yosh & PC pipes have significantly longer primary lengths which is a big key to making good torque in a single cylinder engine. And I'm not impressed with it's sectioned pipe construction vs. the smoother mandrel bent tubing of the other 2 pipes. The other 2 both have dyno charts claiming extra power increases. I couldn't find any dyno chart on the CW website so you may want to look further into what kind of power it makes. Seems to me that it's designed mainly for better looks & more noise rather than making more power.
 

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Discussion Starter #6
Yea I always figured backpressure might become an issue, I got the pipe because of it being fully under the bike keeping it out of harm from track day lowsides. Oddly enough it's quieter than both the other pipes. If it comes down to it I suppose I can live with the reduced power I was just curious if other people might have some suggestions.
 

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Yea I always figured backpressure might become an issue, I got the pipe because of it being fully under the bike keeping it out of harm from track day lowsides. Oddly enough it's quieter than both the other pipes. If it comes down to it I suppose I can live with the reduced power I was just curious if other people might have some suggestions.
Thanks for sharing; I just ordered a ceramic coated Brock's Performance exhaust, I was already sold for the Comp Werkes until I read this post.

Cheers!
LP
 
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