Tales from the Emporium

**NordieBoy** · 23rd March 2007, 19:20

Run #1 - Removed snorkle, drilled slide, Supertrapp IDS with 8 discs.
Run #2 - 1mm spacer under needle.
Run #5 - DynoJet kit - Needle on 3rd from top, 155 main jet (recommended was 4th from top and 160 main).

Should be good

Here's the Air/Fuel, Power and Torque graphs comparing the runs.

**far queue** · 23rd March 2007, 20:23

And what did the seat of pants test tell you? Does it seem worth while? I'd also be interested to know what the fuel economy's like? Can you let us know when you've done some rides?

**NordieBoy** · 23rd March 2007, 20:52

Pants are in the wash.
Will find out over the Maungatapu tomorrow.
That extra torque from 3500-5000 should be useful.

The popping is still there in abundance

But I have found a cure for via an iPod and Jethro Tull

Also trying out a ScottOiler Cramp-Buster.
My right shoulder hasn't come right yet from the DustyButt so I thought after seeing TransAlper's one on the mini DR that I'd give one a go on the mighty DR.

I'll fill it up after the ride tomorrow and find out how far it can get in the next week.

**cooneyr** · 23rd March 2007, 21:45

Do you have data from a run pre modifying the bike? The torque and power percentage changes are both less than 10% which if I put my cynical enginers hat on are probably going to be marginaly noticable, if at all noticable. Torque up by 8% power by 6% yet air/fuel ratio by 11%. I take it that because of the lower air to fuel ratio yet the volume of air sucked in remains constant (capacity of the bike stays the same) that your would use more fuel?

This is good data though which you have very kindly provided. Maybe a stock bike to your set up would be a bigger percentage change though?

Cheers R

**far queue** · 23rd March 2007, 22:24

Originally Posted by cooneyr

The torque and power percentage changes are both less than 10% which if I put my cynical enginers hat on are probably going to be marginaly noticable, if at all noticable.

That's what I thought, hence the seat of the pants question. But with all the posts I've read on Thumpertalk about this conversion, the yanks seem to think it makes a huge difference from stock.

**nallac** · 23rd March 2007, 23:12

the jetting,exhaust header mod and air box mod seem to make a huge difference to the seat of pants. weather its real is a different story.feels good.
Before the mods i was getting about 20ks per litre after about 15.
But it feels so much better to ride.but then i don't pussy foot the bike.

**peasea** · 24th March 2007, 09:06

I think you can safely say it's real. Stock breathing/jetting is pretty lame. It's set up to meet EPA standards which, oddly enough for a 'clean/green' nation, don't apply here. You get real life results from better intake/exhaust bolt-ons and appropriate jetting; you might want to consider a day on the dyno too. If your intake/exhaust is improved and you run lean you can kiss a piston goodbye in short order; especially at higher rpm. If you don't want to use a dyno at least get an exhaust gas analyzer onto it. Good luck.

**NordieBoy** · 24th March 2007, 09:38

I don't have one completely stock.
#1 is No snorkle and SuperTrapp with 8 discs and extra hole in carb slide.
It had a much better feel than stock though.

The things I like from the torque graph are the fact that the torque at 4k5 is now coming in at 3k5 and that the maximum torque of the old setup at 5k is there at 3k7.
On the power graph the hp at 6k is there at 5k1.

It should pull away from lower revs much better and cleaner.
I'm not too worried what happens above 6k as in normal use I don't go much above 5k (4k5 @ 100kph).

@5k there is 10% more power and 10% more torque.

Off to test it through the Maungatapu now

**cooneyr** · 24th March 2007, 11:54

You quite right - rather than vertical change on the graph the hoizonal shift is probably more relavant i.e. power is available sooner in the rev range.

Let us know what you think of the change.

Cheers R

**NordieBoy** · 24th March 2007, 21:53

Well after going through the Maungatapu I found my max rpm's was 5100 pulling 3rd gear onto one of the gravel straights heading into Pelorus.

I tend to use a higher gear with less revs and it pulled away no problems.
Definitely felt better with no hesitations or lag.

The main problem now is I found that one of the 2 remaining (one broke years ago) machine screws holding the SuperTrapp discs in is no longer there...
Must have objected to the gas analyser up it's bum yesterday.
The remaining screw was loose and the discs have been rattling around causing a bit of damage.

Pulled the core out and half the packing is gone.
Re-packed with some glass string from an old pipe and the SuperTrapp remainder and could have put some more in as well

I may be looking for a new can soon as this one is getting to be a bit of a Frankenstein's Monster with all the bolts holding it together but it is over 5 years old and has been on 2 bikes and never been re-packed.

Anyone got a SuperTrapp IDS they don't want?