33bhp Dyno Resutls

Worth a try, perhaps say you lost the certificate but have resticted ecu fitted, show him / her and ask if they can get hold of another one for you.

This is a very interesting thread. I hope you have been able to sort something out.

Dynojets have always been criticised for reading too high. It boils down to the software doing the calculations on how fast or easily the drum spins. My bike is regularly on a Dynojet 250i and it must be the exception to the rule. It reads slightly under. However, using the same dyno time after time means I can see the gains (or losses!) easily. It is only when the bike gets run elsewhere that we know it is low.

Dyno's read rear wheel power. A simple way for you to lose some power would be to raise the gearing, thus making the motor work harder for less end result. Horsepower is only a calculation of torque (HP=(Torque*rpm)/5252) so if you can get the torque down ( ie; make the motor work harder) the power will come down. Stick a slightly bigger front sprocket on it and let some air out of the tyre and it should drop below 33hp.

Or you look to alter the AFR and/or exhaust. You could put a more restrictive exhaust on it and/or another layer of foam on top of the air filter. The AFR is pretty good but if you lost a bit of air around the 45mph mark you will create a temporary restriction for the purposes of gaining the correct result. A rather crude way of doing it but it would work.

I'm sure you have a solution by now....its a little odd, reading a dyno thread about losing some power! Good luck.

[hindle8907]

lol ... well i havent done anything yet ... as hold up sugested i rang a few dealers / garages and most of them said i would have to buy a new ECU lol .... but 2 of the people i called said stick the full power ECU in and come down with the 33 BHP Ecu and they will fit it for 30 quid and give me a Certifacate . so when i get some money ill take it down to him .

Originally Posted by Dave20046

In theory there's no need for certificates of any kind, it's only when there's a claim such things come in handy. The dyno certificate hindle's just had done would incriminate him so best binning it/safekeeping it. I'm guessing the ecu was second hand or something so didn't come with a certificate. Something you could do is take it to a bike shop, swap ECU's hand them the restricted ECU ask them to fit it and give you a recipt then part with a fiver. I would have thought a receipt from a mechanic saying they'd fitted a restrictor kit would be enough.

my sv is 33bhp but insurance companies dont ask for a dyno reading not even the police if a crash happens they just find out if the ecu is a 33bhp unit .i wouldnt worry bout a dyno reading myns ristricted and i aint gt a ticket they only ask for it if u crash just dn crash.,

[yorkie_chris]

spk fkin nglish

It's all well and good saying "don't crash", however, if you get wiped out by some tossuer in a car, then find your insurance contains some small print which requires the certificate you could be in your own little world of inconvenience...

The thing to do is check with your insurers what is required, and if they do require a certificate then go elsewhere!

Bikesure, carole nash and bennetts were fine with my explanation and all came back with "if you have an accident, we will physically check the bike."

Bikesure and carole nash were also OK with the fact that the restrictor on later evolution of my SV was a homemade throttle stop jobby.

Originally Posted by boot

Had been told buy chap at Suzuki Chesterfield that power should be measured at the crank.

For restriction purposes the law states that the bike needs to be 25kw(33bhp) at the back wheel. Hence why my bike is stated at 45bhp at the crank and 33 at the back wheel.

Originally Posted by boot

Had been told buy chap at Suzuki Chesterfield that power should be measured at the crank.

Any dynamometer can calculate the power/torque at the crank but it is only a calculation. It gets done by loading the dyno brake to increase the load. The only true way to measure output at the crank would be the remove the engine and run it on a testbed. Hardly practical.

This is interesting. On my last bike, a 1991 zxr400 developing about 67bhp i got it restricted, being 17 years old. On the certificate, it says that the certificate is invalid if you have an after market exhaust, unless steps have been taken to negate its effects. Not sure what she was producing restricted, but i soon got bored of being kept out that heavy powerband and took the restrictors out anyway. It seemed the exhaust, K&N and up jetting were preventing me even opening up the throttle much before it bogged down and complained.

Still (but only just) inside my 2 years, i got the SV and didn't bother having it restricted. My insurance company never even mentioned it, and im TPFT anyway so they will struggle to prove my bike wasn't restricted should i have to claim for it anyway. It'll either be burn't out or missing entirely. Never had any trouble with it.

Lastly, im amazed at your dyno printout. I had mine dynoed to check the fuel/air mixture was fine with this exhaust, and im amazed at the difference between them. They seem to kill all the fun, all the power!

[QUOTE=simonDyna;1993271]
Dyno's read rear wheel power
QUOTE]
No they don't, otherwise it would change drastically depending on what gear you are in. In first gear, many bikes put over 1000nm of torque through the rear wheel.

Originally Posted by Liam9188

Still (but only just) inside my 2 years, i got the SV and didn't bother having it restricted. My insurance company never even mentioned it, and im TPFT anyway so they will struggle to prove my bike wasn't restricted should i have to claim for it anyway. It'll either be burn't out or missing entirely. Never had any trouble with it.
You missed out the Third Party part of the insurance... it wouldn't surprise me if your bike got inspected for restriction if you tried to claim off someone else or if someone else tried to claim off you. Your insurance company will do anything to get out of paying out. Sure, legally they have to pay for the third party's vehicle if it's your fault, but then they'll take you to court to get the money back.

Lastly, im amazed at your dyno printout. I had mine dynoed to check the fuel/air mixture was fine with this exhaust, and im amazed at the difference between them. They seem to kill all the fun, all the power!
You can still have loads of fun on a restricted bike. Just takes a bit more skill/time to learn to ride it fast.

.