bmc race vs race rs

what mods do u have and what jets do you run northy?

[northwind]

Eh, from the front to the back as it were... Chewy's tank spacers, BMC Race RS filter, Renegade intake trumpets out of their airkit, then the cam swap with K3 intakes and carbed intakes on the exhaust side (which shouldn't really affect jetting, since it shifts more mix, it doesn't change what goes in and out... But you never know) and then a full WRP race system with a shortened end can. At the moment it has Dynojet 180 mains in, which is unreasonably big but dynos just fine- I was pretty surprised, I thought it'd top out at 170. 180 is, I gather, one step up on stock for a Firestorm! The Rene trumpets may or may not make a difference, I really don't know.

Good for approximately 80bhp at the rear wheel, though tbh I'd say if it's on either side it'd be beneath Still to run it with the right jets, and with a really good setup otherwise, it made 77.5 last time out but that was a sloppy run with undersized mains. TBH, the best way to get a higher poewr figure with a dynojet dyno is to come back on a colder day, so we'll see what happens in the new year when I get back there.

Is it worth it? Well, it's been about £35 and maybe one and a half hours per horsepower, I reckon. So probably not I did it all pretty cheap, and did the work myself (just a couple of test dyno runs after I'd set it up by bum dyno) so it was cheap but time consuming. Though it's not all about peak power, it doesn't fall off much after peak and it gets there sooner so the "usable maximum power", if you like, is far better than stock. More mids as well, so for sheer rideability it's good. But messing with bikes isn't just about the results, if you ask me. The smart thing to do is to leave it exactly as it came out of the crate, but I like messing with things. [/i]

[Skip]

Originally Posted by northwind

180 is, I gather, one step up on stock for a Firestorm!

I bet thats great for fuel economy!

[TSM]

Originally Posted by svrash

no just a hole similer to the K&N IIRC

It actualy looked smaller to me on the BMC Race vs K&N.

[northwind]

Originally Posted by Skip

I bet thats great for fuel economy!

It's actually not bad at all... It's got a mean thirst on fast road work and trackdays, mind, but economy's all about how you use it. Plus, having more power at 5000rpm than you have at 6 means I'm often a gear lower than everyone else

what is so bad about pod filters? why does no-one use them

[northwind]

They're a sod to set up, for one Plus to get best results you need to muck about with the floats and the air jets. You also need to do something about the crank breathers, not hard but it's extra hassle. Some people say they're problematic in the wet, which doesn't really seem to be borne out, but they definately can be sensitive to wind.

The standard logic is that a bike needs a big airbox to make good torque. But the other possibility, is that inefficient pods are still better than a very efficient airbox, since by brute force they do more than a good airbox does by finesse.

I've not tried it... I will, I'm sure, but not just yet.

so if a bike had injectors, lamda sensors and airflow meters then the bike would set its self up so pods would work well but on a carbed bike panel/box filters are best?

[northwind]

Well, not best... It's all just sliding scales, you have cost, work, results and usability, and it's all about striking the right balance. Which imo is LEAVE IT ALONE! until you add in the 5th scale, smug satisfaction at a job well done.

i got my bmc race rs filter today - the finish on it is ****, are all bmc filers the same?

also - is the renagade air kit any good