Getting a bike set up on a Dyno?

[iCraig]

Well since changing the exhaust on the GPZ, I noticed the downpipes glowing when I was running it the other day, which lead me to believe it was running lean.

So I thought I shall get it set up on a dyno properly and rejet it as I intend to fit a K&N Filter aswell.

So I was wondering what I should expect from the dynorun and how much am I looking at?

Any advice will be greatly received.

[mchaggis]

Don't forget you can have a gander at the spark plugs to check the mixture, a bit more quantitative than just seeing the downpipes glowing.
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[stinkwheel]

From what I remember, Motad Nexxus pipes make them run a tiny bit leaner than standard but not so far as will do any harm. As has been said, check the colour of the plug electrodes. If you are going to be changing the filter too, a dyno run would be a good idea although I have never had one done either.
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[instigator]

Can't say I've done a dyno run on my bike either, having said that it didn't feel any different after k&n filter and a diff. exhaust system.

A run on the dyno to prove my bikes 33bhp was £37.50 excluding vat, and that lasted about 20 minutes or so. So expect about £50+ if the bike needs meddled with.

P.S Stand outside the dyno room, the gpz will sound great.

[cunni]

It all depends what you have done and what your idea of a sorted dyno run is?!

If you want someone to tell you if it's lean and adjust it slighty, then possibly around £40-£60.

If you want to slightly tweak it to use the potential of the new exhaust, then you will need a re-map and that might set you back as much as £120!

If you really want to make the most of your bike, then you'll be getting them to add and set-up a Power Commander, which will set you back around £345 (ish).

You could just look into the idle setting on your bike or the carb. openings or jets or injectors (depending on what your bike has).
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[Mr C]

I assume it's a carb model ZZR?

In which case all talk of re-maps and power commanders are irrelevant, carb bikes don't (by definition) have EFI so there is nothing to remap or adjust with a Powercommander - you'll be wanting a jet kit to match the new airflow.

To give you an idea, I am visiting a mate in Maltby N Yorks next week for a full remap of mine, including fitting new ally velocity stacks.

His charge is about £100 for the whole day, including the rework and mapping. I think that's pretty good value as it does take the best part of a whole day to get it just so with a Powercommander. I would imagine the work needed to calculate which jets is less, here I'm guessing

one run to determine pwer, but more importantly air fuel ratio over the rev range

take the bike off, calculate which jets you need, fit the jets.

re-run to check



is it any more complicated than that ??


*edit - just noticed it'a a GPZ - vintage before EFI so definitely carb rejet .... what else can you do to adjust fuelling?
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[Kickstart]

Hi

I would be tempted to just cheat at first. Whip the tops off the carbs, take out the needles and drop the clip down one notch. This will richen up the mixture through most of the throttl / rev range.

If there are no alternative notches on the needles then use 1~2 tiny washers under the clips to shim the needles up slightly.

All the best

Keith
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[cagiva gezzer]

My dyno runs cost me £10 for a mixture check and a couple of printouts.

Depends where you go and what the operator is like. My local place "road and track" lets me work on the bike while its all rigged up, thus saving me labour costs if i want to try different set ups.

Glowing pipes are cool!

https://www.roadandtrack.co.uk/images/pipes_r2_c1_f2.jpg
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[Flip]

Craig, why bother if your selling it mate? Let the person who buys pay for filters etc.

[RealNinja]

Bykers tyre place have a dyno now, if you are looking to have it run, and set up.

Alternatively, you could use Rhencullen in Hinkley, who did my ZX7R. A full setup and 2-3 runs cost me about 120 quid (plus you get to drool over some of the tricked up race bikes they have being tuned )
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