Understanding Dyno charts

I had a PC3 fitted to try and smooth out the FI and Dave at HM did explain what this all meant , but I was too excited to pay attention and get back out on the bike.

Can someone give me a basic explanation please !


what do you need to know? and them graphs are great :smiley:

Well the top one I think is 20/40/60/80/100 throttle right with the fueling underneath.

On the middle one I see and understand the fueling , but the main bit is a loss !

And the last one is the standard gear change in comparisson to the quickshifter ( I think )

Oh last things is the temperature variance on the runs , should they not be the same ?

err and 92 bhp from a gsxr 600 is not that great !!

I think it’s a GSR 600 Adz. Either that or there’s some small animal getting int the airbox at 10,500 rpm and strangling it. Looks like it would really benefit from some extra breathing, cams perhaps.

Yup , its a GSR fella

ahh all good then!!

how does it feel?

Much much better , the original fueling made it really jerky but the new mapping had made a world of difference.

Did it solve the throttle jerkiness thing completely, without messing with your TPS ?

Well to be fair I havent ridden on a bike with the TPS changed so cant compare , but I have ridden for the last 6 months on it and can say it is much much better !

When I release the throttle there is no sudden drop in the power and when I open it back up again you dont feel like getting thrown off the back as it kicks in.

If the ambient air temp was the same then yes, they should. The dyno can take air temp into account to give you an accurate indication of the power, at high air temps the engine will not be performing as well as it does with low air temps (hot air is less dense) so on a hot day the operator will tell the dyno it’s 25C and the dyno will add a couple of percent to the bhp reading. On a very cold day, say 2C, the dyno will adjust the power reading down a bit so the readings are all more or less the same according to whatever standard the operator has chosen to use.

Sometimes the heat is a product of a previous dyno run so the dyno room gets very hot, hence why rooms used to create maps rather than just perform a power test usually have large cooling fans or air conditioning.

Does the bike feel significantly better ? If yes then it’s probably worth having had it done, if not then the difference in temp figures needs to be explained.

Thanks for that Steve , and a resounding YES it does feel much better and Im happy to have had it done :smiley: