Thinking of getting some FCR's?

billy budge · Post by **billy budge** » Wed Jul 25, 2007 9:45 pm

Dave that is sweeeeet news man,

Fcr's are trekking their way to me as we speak from japan and hopefully pick up my full exhaust system this weekend.

Looking foward to those sort of gains.

philk · Post by **philk** » Wed Jul 25, 2007 10:24 pm

trixynut wrote:Billy,

Correctamundo: FCR41's with foam pod filters, full renegade exhaust system, TPS mod and totally standard engine (no cams, overbore, head work etc) showed 90bhp on my 'rex. Mmmm, nice!

Dave

Dave,

So what about with cams and a gas flow?

Post by **phuk72** » Wed Jul 25, 2007 10:31 pm

cams, gas flow etc & big bore kit is worth about another 10

philk · Post by **philk** » Wed Jul 25, 2007 11:10 pm

phuk72 wrote:cams, gas flow etc & big bore kit is worth about another 10

What about, without the big bore?

HansJ · Post by **HansJ** » Thu Jul 26, 2007 8:50 am

philk wrote:
phuk72 wrote:cams, gas flow etc & big bore kit is worth about another 10
What about, without the big bore?

The bigbore won't give that much in BHP, around 2 would be a fair guess. But again, with a well flowing head, a big bore makes more, with standard less. As with cams, only cams are not worth that much, but together with a wellshaped inlets, it can produce much more BHP. And it also depends on what type of work that has been done, decreased and re-shaped inlets, or just opened up inlets, produces different engine character, and the cams have to match the character...

The more You learn, the more You understand how little You really knows...

trixynut · Post by **trixynut** » Thu Jul 26, 2007 10:27 am

Don't know anyone whose dyno'd a motor with FCRs/full system/cams/headjob but on a standard sized 850 motor so difficult to say, but Hans is probably right:

Standard motor does about 76bhp.

My motor (41 FCRs, full system, foam filters) does about 90bhp.

Phuks motor (all the above plus cams, headjob, overbore) does about 100bhp

Overbore is probably worth 3-5bhp ??

This is my dyno chart (red line: run through gears, blue line: top gear roll-on)......

Dave.

Post by **phuk72** » Thu Jul 26, 2007 10:43 am

Biggest benefit from the big bore is additional torque - the outright power gains are probably only 5bhp max.

Gas flowing is a serious matter and needs to be done proprly by someone who understands what they are doing, what pwoer characteristics you want from the bike and what other mods you have done.

I've always been told cams without flowing is a waste of time.

wicky · Post by **wicky** » Fri Jul 27, 2007 1:42 pm

dyno'd "No.7" last week and she kicked out a claimed 79.1 bhp. they were happy with me fuel/air ratio etc etc and i left it alone at at that. 1999 TDM 850, s/steel Devil downpoipes, 2-2 road legal carbon cans, k&n filter. Me mates TDM 850 fitted with TDM 900 barrells, pistols, and conrods, mildly ported head, K&N filter, and 2-2 carbon cans made around 83bhp.

http://www.carpe-tdm.net/ipb/index.php?showtopic=4961

Killerwhale · Post by **Killerwhale** » Thu Aug 02, 2007 1:50 pm

LozLul wrote: To cut long story short, I just received an email from BR special tuning in UK with an offer. So, if you are interested in a pair of brand new FCR's you might want to read this. And I know, the price is not as low as some of the US vendors offer, but it seems that there is not that many TRX/TDM specific carbs left over the big pond. Well, at least I could not find any.

Here is a link to their Keihin website.

That's all folks.

They are available now!

Yamaha TRX850 Enthusiasts Forum

Thinking of getting some FCR's?

Re: Thinking of getting some FCR's?