disappointing bench numbers for a GB STW 1100

[jihem]

just got back from a totally soaked 150 kms trip to a Fuchs bench with my STW 1100 (level 2 ecu ands exhausts). I wanted to see exact numbers before getting down and add a few HP here and there...(maybe).

 

the numbers are disappointing, only 71 Hp at the back wheel and the 9 mkg torque is at...4270 rpm..., and i don't know exactly how i should read all this.

 

 

to start with, the bench guy didn't of course have GB in his machine, so he took the 1100 sport numbers (same gearbox). Somehow, his machine wouldn't give proper readings and he had to redo it a couple of times. Needless to say they don't do twins nor guzzi (it's a multi marques place).

 

what's really strange is the torque curve...overall number is good, but it's way down the curve...

what's really strange (2) is while the 87 HP (crankshaft) is very low at the wheel (71 HP), i have yet to encounter a V11 which is faster than the STW in pure acceleration and overall speed...

 

it's odd as the bike goes really well, pings once in a while, doesn't stall, accept every invitation to accelerate, has great braking power, etc..

 

what do you guys made out of that ?

[Guest ratchethack]

Torque peak at 4300 RPM and very close to it at 3700 RPM?!?!

 

I simply can't believe it........

[Guest Nogbad]

My utterly bog standard V11 Sport made 72 rwhp on Max Moto's dyno and I haven't got any mods. Standard airbox, standard ECU and standard exhausts.

 

I'll try and find the printout.

[jihem]

i know...it's very odd.

the numbers are very low, but the bike goes like a bullet...

[Guest Nogbad]

i know...it's very odd.

the numbers are very low, but the bike goes like a bullet...

90362[/snapback]

 

It looks rather lighter than a standard V11 though!!

[Guzzirider]

Numbers mean nothing be they high or low- if you are happy with the way it goes that is the important thing!

 

Guy

[jihem]

Numbers mean nothing be they high or low- if you are happy with the way it goes that is the important thing!

90367[/snapback]

 

 

i aggree, but as I want to start work on the engine, i need to know where we are so far.

and i'm not sure the numbers are really correct, cos the bike feels and seem faster than the numbers on the bench.

 

yes, it's lighter than a normal V11. which could be ok for an explanation on its relative speed and acceleration.

 

But if the engine hasn't been touched and is "graced" with freer (race) exhausts and EVR eprom, it should at least make more than a stock V11, no ?

 

i'm puzzled (and very wet as the weather sux...)

[richard100t]

I'd get a new test done on a dyno thats setup to do a guzzi. Sounds like you may have gotten a bad reading.

[Guzzirider]

i aggree, but as I want to start work on the engine, i need to know where we are so far.

and i'm not sure the numbers are really correct, cos the bike feels and seem faster than the numbers on the bench.

 

yes, it's lighter than a normal V11. which could be ok for an explanation on its relative speed and acceleration.

 

But if the engine hasn't been touched and is "graced" with freer (race) exhausts and EVR eprom, it should at least make more than a stock V11, no ?

 

i'm puzzled (and very wet as the weather sux...)

90368[/snapback]

 

I'm taking mine on 15th June to HTM in Aachen which is probably not a long way from you- 150km?

 

I suspect they will be fine as they specialise in Guzzis but I will let you know how I get on.

 

Regards

 

Guy

 

P.S. Raining in Belgium?? Surely not!!

[Skeeve]

just got back from a totally soaked 150 kms trip to a Fuchs bench ...the numbers are disappointing, only 71 Hp at the back wheel and the 9 mkg torque is at...4270 rpm..., and i don't know exactly how i should read all this.

...Somehow, his machine wouldn't give proper readings and he had to redo it a couple of times. Needless to say they don't do twins nor guzzi (it's a multi marques place).

 

what's really strange is the torque curve...overall number is good, but it's way down the curve...

what's really strange (2) is while the 87 HP (crankshaft) is very low at the wheel (71 HP), i have yet to encounter a V11 which is faster than the STW in pure acceleration and overall speed...what do you guys made out of that ?

90350[/snapback]

 

No, what's really strange is that the HP & Torque curves don't cross @ 5252 rpm! Anybody who purports to "dyno" your bike, cage, engine, whatever and the curves aren't converging below 5252, cross @ 5252 (provided the engine revs that high) and diverging above 5252 rpm, don't pay them! They might as well be telling you your horoscope...

 

Ride on,

[jihem]

I suspect they will be fine as they specialise in Guzzis but I will let you know how I get o

90384[/snapback]

 

 

i was there a month ago: they seem very competent.

on your way there, you have to pass thru brussels. What about a cuppa coffee ?

[Guzzirider]

Sounds good- there may be three of us on very dirty thrashed (trashed?) Guzzis. Not sure of our exact plan yet but we will probably be riding from France en route to Valkenburg on the 14th June. Will give you a shout nearer the time if you want to meet up.

 

Regards

 

Guy

[dlaing]

No, what's really strange is that the HP & Torque curves don't cross @ 5252 rpm! Anybody who purports to "dyno" your bike, cage, engine, whatever and the curves aren't converging below 5252, cross @ 5252 (provided the engine revs that high) and diverging above 5252 rpm, don't pay them! They might as well be telling you your horoscope...

 

Ride on,

90398[/snapback]

I think that only holds true if the torque is foot pounds and the HP is HP and not PS nor KW.

 

FWIW, isn't the G&B basically a slightly tuned California engine?

Compare it to a couple of Jackal dyno graphs

Details here:

http://www.guzzitech.com/Bubs-Todd_E.html

[jihem]

FWIW, isn't the G&B basically a slightly tuned California engine?

90458[/snapback]

 

yes, i've heard some saying that STW are using EV cams, but it has been denied by bruno. i dunno. I'm really puzzled.

[Josh]

Nice bike Jihem, looks good and goes like a bullet? Dyno's give me a headache, the important thing is" IT GOES LIKE A BULLET".