Another happy customer :Gangsta2_9BI664:

:clap: :clap:

Looking forward to you posting the map so people with a similar set up can give it a try

I have had my DNA Stage 3 on my XTR since Jan 2010 (I think I was #3).

How many people do you know who spend MORE $$ (than the DNA S3) on an aftermarket exhaust that rarely does anything for performance?

Then they cringe when they see the cost of the S3!!! Go figure!!

Example in NZ : Leo Vince exhaust $NZ1600ish. My S3, $NZ930ish.

Anyway, I just wanted to add to richardsracingmad's approval of this mod.

I should say right here and now that I don't have shares in DNA but I do believe that this is the best thing that anyone can do to increase the riding pleasure of their XT660.

One last point - I haven't even optimised my S3 (like this guy) by using a PC3 but I am still well pleased with the outcome.

I love my stage 3 airbox, in my eyes it is well worth the money for the gains it gives.

Of course I will share my map.... I don't have Paypal, so will use a friends account to join "XT Supporters". I think that should be the next priority! But you could pm me with your email addy.

After alot of initial confusion and then understanding how it works (big thanks to Kev - who has answered ALOT of silly PM'S from me) - I have decided to leave the O2 Sensor on and connected for the dyno.(please note- that was my own decision) Depending on how we go for time on the dyno, we may try it removed. Also, my own decision to run Super Unleaded, 97 Ron.


But yes, this really is a good mod for an XT. I think it will be like a KTM Duke performance, without having to live with a KTM Duke!

And my little DRZ400, which was a lovely bike, would have been wheezing at 85mph, it maxed at 95mph. It vibrated more, but was more of an offroad than an onroad bike.

So, as far as cost goes, My 2008 XTR with 120 miles was �3300. I have added near-as �1000 mods, = �4300. And its near enough a brand new bike. Now have a look at which "slim" traillie you can buy for �4300, and I think you could rule out the more serious, vibrating Husa, Verte, KTM, Husky, ...I still think I have got a great performing bike, for a great price!!

What's more, the big thing is, "it's still a bike thats easy to live with". And the mods I have done are just bolt on, all easily reversable to standard spec.

Smiles per miles - thats what it's about !

Dyno Power Run...after DNA Airbox
 

Its running Sweeeeeeeet! Sounds like one of those automatic-rapid fire machine guns....with NO hiccups!!! She just pulls and pulls!!!!

At first glance, the results are not what I hoped for......but give a bit of understanding, as unfortunately it wasn't a "like for like" before and after Dyno.......I haven't got the time tonight, as I'm off out in a mo... but this is our best reading today at 32+C degrees....49.01 bhp....47.00 lbs torque....with No Correction on the dyno for the temp/humity etc....more detail later, but BOY! am I happy with the pull and the new grunt my bike has....and she behaves with that god-awful low down surge too, almost non -existant!!!! She's a flyer!!!!!...............more later.... love my XT!!xx
( ...hence the late report, just bin ridin'....lol)

Well...Dyno-man did over 30 runs with my bike, so there's alot to say... best leave it till t'morning as I've had a night out......but i'm dead chuffed with it now!!!!!

Very nice gain, don't worry about the final HP & Torque readings on paper, as mentioned before every dyno reads differently, the gains are what we want to measure. An extra 6.21 HP & 6.43 Torque just under a 15% GAIN, you got to be happy with that.

I have not met a rider that does not like the stage 3 air box, every one of us have a smile every time we ride out bikes.

Any back to back print outs on the dyno run. Did you by any chance get the dyno runs on a pen drive as I would love a copy to study your runs?

Pen drive? I don't know what that is...but I asked for the figs. to be e-mailed.

Dyno with DNA Stage 3, Carbon Cans, PC111, AIS Blocked, O2 Sensor fitted and connected, 97Ron.

A 2 and a half hour session.32.23 deg C, 1033 MBars,Humidity 8%,Uncorrected, Smoothing 2.

My AF ratio he was aiming for was 13.9:1.

The best Peak horsepower we got was at the start of the session from the DNA map 660 Open Ackros,which was the map I had loaded, where we got 45.17, 47.83, 47.56, 49.01. However the AF was around 16:1 and at peak power 16.5:1.
Best run 49.01hp 46.54 ft lbs

He also then tried the DNA 660 Standard cans map on the CD. Again good figures but the AF was much much better, AF peak was at 3500 15.7:1, but from 5000 to 7000+ was running around the 14:1.
Best run 48.40 hp 47 ft lbs.

Then he made a map for me. He did the different throttle settings power runs, and we got a best run of 47.83 hp (5hp Gain) 46.57 ft lbs(6 ft/lbs Gain) on my new map. The AF is very similar to the DNA Standard cans, but just that bit better/ lower, but at 3500 revs, and also 2250revs running AF Peak to 15:1. AF Low 11.9:1 at 2300revs. (see my AF ratios at bottom of post) The weird thing (meaning great thing), is that my torque figure is almost the same as my HP figure, unlike Kevs maps.

Summary. The bike feels wonderful, but the dyno doesn't show the figures I thought it would. ........but I think I would rather it that way round than the other!!

Kev, do you think that my AF ratio of 13.9:1 target on my map is a little conservative? I would be very interested to know what your AF ratio readings were on the 2 DNA maps, Standard Cans, and Open Ackros. ( to see if my AF readings are sound)
You say you have an "economy" map 13.8:1, but a "power" map at 13.2:1 ??
Here are my AF figures on my new map...3000 13.9, 3500 15, 4000 14.1, 4500 14.4, 5000 14.2, 5500 13.9, 6000 13.6, 6500 14, 7000 14.
Also, I can't understand why my very best HP figure was at an AF of 16.5:1 = 49.01hp?? And the second best HP figure of the day 13.6:1= 48.4hp?? I thought a richer mixture = more power??

If you would like to see my map Kev, tell me how to do it and PM me.

Richard,

It's most likely because of the problem with these ECU's and mapping.

if you see here:
http://www.youtube.com/watch?v=ZwTfuwZZ848

This is one of Kev's videos of the AFR that he recorded with his wideband commander.

It's because of this, and the fact that above 2500rpm and 70 degrees coolant temperature that these bikes cannot be mapped correctly to gain an ideal AFR.

Kev has found a solution for this and I can say myself that it works, but its not without a little ingenuity and requires further work and 'lightening' so to speak. Dynojet are also aware of Kevs findings.

I dare not say anymore for fear of a shafting from Kev, however, rest assured that what you've come across there with the weird AFR's and so on is not uncommon and currently, is the norm!

Ideally, you do not want to go past 14.7:1 AFR because that is the stoichiometric ratio for petrol, however running richer makes the most of the engine, especially an engine thats allowed to breathe! Anything above that could possibly cause damage to the engine because when an engine runs lean, it runs hotter and has the potential to melt pistons!!
It's unlikely, but possible.

Dynojet themselves recommend for economy an AFR of around 13.8 and for power between 12.8 and 13.2.

I myself have my autotune set to 13.2 with it set on learn mode but wont be able to do much more untill I get a permanent O2 sensor Fix.