Tiger 800 + Arrow + Tune - Dyno Graph

[Dex]

Had the Arrow exhaust and factory tune for a few hundred miles now (baffle out of course) was at Prescott today and decided to get a dyno run done.

Excuse the "camera phone photo of a printout" but the scanner is in the cupboard and I cba this evening





I'm not going to get into the big "dyno peak numbers" discussion, as there's a million possible variables and ways to fiddle for a nice peak number. For those who are interested they are given as crank figures.

What impressed me was the Dyno Operator's comments - "You don't get a curve that smooth without some serious development time. I've never seen a power curve as smooth or torque curve as flat as that on this dyno, even on bikes we've mapped."


He was genuinely amazed by it, especially for a factory tune.

[Dex]

For those who only think in "old school" - 81.15 Nm is 59.85 Lbft

[Goulash]

That arrow makes a difference, no arguments from me as i've got one as well. First thing i noticed was how much smoother the power delivery is, no popping, farting or any other noises, not even on the overrun. Pricey but worth it imho and makes a hell of a difference on road.

[Dawg!]

Originally Posted by Dex

Had the Arrow exhaust and factory tune for a few hundred miles now (baffle out of course) was at Prescott today and decided to get a dyno run done.

Excuse the "camera phone photo of a printout" but the scanner is in the cupboard and I cba this evening





I'm not going to get into the big "dyno peak numbers" discussion, as there's a million possible variables and ways to fiddle for a nice peak number. For those who are interested they are given as crank figures.

What impressed me was the Dyno Operator's comments - "You don't get a curve that smooth without some serious development time. I've never seen a power curve as smooth or torque curve as flat as that on this dyno, even on bikes we've mapped."


He was genuinely amazed by it, especially for a factory tune.

Dont suppose you had it dynoed before the Arrows was fitted?

[Seed]

Awesome torque curve Dex - it's like a millpond!

[Bert the tigger]

Originally Posted by Dawg!

Dont suppose you had it dynoed before the Arrows was fitted?

That is very nice

[RichardC]

My dealer told me (even offered) that there is a different map for the Arrows with the baffle out. I didn't take him up on the offer, as I thought that it might give worse mpg, and I will probably put the db killer back in for my 2000 mile trip to around the Alps next month.

[jenkspj]

Originally Posted by Goulash

That arrow makes a difference, no arguments from me as i've got one as well. First thing i noticed was how much smoother the power delivery is, no popping, farting or any other noises, not even on the overrun. Pricey but worth it imho and makes a hell of a difference on road.

It transforms the bike.
Not sure about removing the DB Killer bit.

[jenkspj]

Originally Posted by RichardC

My dealer told me (even offered) that there is a different map for the Arrows with the baffle out. I didn't take him up on the offer, as I thought that it might give worse mpg, and I will probably put the db killer back in for my 2000 mile trip to around the Alps next month.

A question, Richard: how did you undo the torx screw that hold the dB Killer tube?
Easy to grind the blob of weld off, but there is no room to get a torx socket in the screw!!

[Dex]

That graph was for an Arrow can with baffle removed and Arrow Tune.

I had a look and can't see different Tunes for baffle in/out - There's Std can, Std can ABS, Arrow Can and Arrow Can ABS.

Didn't get bike dynoed "before" as I didn't have my std exhaust with me at prescott (would defeat the weight loss advantage ;) )

Given the number of variables that affect numbers on a Dyno I think the figures are only ever an indication, it's the shape of the graph that is telling. If I'm trying to decide the benefits of mods I'd only ever compare the numbers from the same dyno, same dyno operator, same tyres, tyre pressures, etc etc.

It would be interesting to see the graphs from a bike with a Remus, or Scorpion can, not to compare numbers but shapes - as these cans seem to be designed to run on the original map. To be honest, I'd be surprised if Scorpion/Remus put as much development time into their exhausts as Triumph/Arrow clearly have