Gt186 carb and exhaust

[hendy]

Thanks coaster. I appreciate what you're saying and if (almost certainly 'when') I fit a 30mm phbh it will be through a breathe sweet filter.

I'd like to go open but i just can't get my head around unfiltered carbs.

[eden]

The exhaust is the main reason your down on power.

[Burnside]

I'm running a BGM clubman on my GT200 which does the job nicely, will happily sit at 65 all day long with a bit left for overtaking. Am about to get a GT186 for my Eibar (just waiting for the GT cranks to arrive) and will be running this with a Franspeed Race, so will be interesting to see what the difference is. Both with 30mm Dellorto and Li150 17/46 gearing

[storkfoot]

..... the GT186 certainly performs well with a BGM clubman, I had trouble keeping up with Storkfoot on his GT186 on my Avanti 225 (over 70 mph GPS and he was pulling away )....

Yes, it is lively that engine

[Lamaddict]

There's something come loose in my KBA Clubman so I need another Clubman but which one is currently rated as the best? The GT186 seems to be an excellent kit so far but with a better exhaust I'm sure it would go slightly better. I don't like the expansion pipe design so it will have to be the Clubman style.

[Muppet]

bgm?

[Lamaddict]

Probably a BGM unless there's something that's proved better. I don't think they make the Mito/ Tutto/ Statos ones, they seemed pretty good. The Cam Lam Ancilotti's are much cop IMO

[eden]

just out of interest I ran my GT250 on a dyno yesterday with both the BGM V3 and with the Franrace, The BGM reduced the BHP by over 10.5 and the torque by over 5 ft/lb.
Under 4k rpm the BGM increases bhp by 2 -3

BGM also reduced the rpm range by over 2500 rpm

30% loss in power between the two pipes on my motor.

Also the air fuel ratio was leaner with the BGM with no jetting changes between the two pipe.

[Timbo]

Very interesting that Eden. I wish Scootering mag did more tests like this. Not that your implying it does, but the Clubman isn't designed (as far as I know) to compete with expansion exhaust but as I said a very interesting comparison.

[eden]

I'm sure originally when it came out it was touted as giving the performance of an expansion from a box pipe or an expansion in a box pipe.... something like that. No doubt it's better than many of the other box pipes available but it's defo not as originaly touted.