Sorry Dave the Thunderace is the YZF1000R
Barry Edwards
----- Original Message -----
From: Dave Biasotti <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, May 16, 2001 6:03 PM
Subject: Re: GTS-1000 Digest - 15 May 2001 (#2001-147)
> You will have to forgive us ignorant Americans, but what model Yamaha is
> a "Thunderace"? I assume it is one of the FZR or YZF 1000 bikes as know
> in the US?
>
> I also agree that there is untapped potential in the GTS engine. The
> big difference is carburetor vs. EFI. One you can change, EFI remapping
> is ?? K&N doesn't make a power commander for the GTS nor plans to- I've
> called and talked to them.
> Just looking at the pencil thin header pipes is one area that could be
> addressed.
> Ram air from the chin screens under the headlight direct into the front
> of the air box instead of the side scoops (which have to make 3 right
> turns) would be another improvement. Usually opening up the breathing of
> any constricted engine will do wonders. But even if you changed to
> larger header pipes, gutted the Cat, air box/ filter changes, how would
> you remap the EFI to compensate? It's current map would not suffice for
> such a radical change.
> Increased HP is also usually at the sacrifice of the torque curve,
> typically moving them both up into a higher RPM range. The trick is to
> keep it in the middle of the RPM range or "real world" power so you
> don't have to rev to redline.
> I had consulted with Factory Pro Tuning in San Rafael, had an
> appointment to leave my bike with them for a week earlier this year to
> have it dyno'd and EFI mapped with an RGA (Residual Gas Analyzer). But
> their dyno broke and was down for a month. Now they are too backed up
> with racing clients to get me in until the fall.
> We did check the EFI box and the chips are exposed on the circuit board
> so they can be removed and replaced. All in all, this type of work is
> expensive - I am looking at $500-$1k just for the dyno/ EFI mapping, not
> including parts for doing any of the exhaust and air box changes.
> But it is intriguing and as pointed out, it is there. It will take some
> engineering work to come up with something useful and demonstrated on a
> dyno. I bet if a power increase kit was offered, it would sell like hot
> cakes to the list.
> Anybody have access to a dyno with RGA at cheaper or gratis rates?
>
> --
> Dave Biasotti // Fremont, CA
> '93 Yamaha GTS-1000 // '83 Honda 650Turbo
>
> >
> > Date: Tue, 15 May 2001 20:45:51 -0700
> > From: Peter Maggiacomo <[EMAIL PROTECTED]>
> > Subject: Re: Learning Slowly !
> >
> > --- Mark C Evitts <[EMAIL PROTECTED]> wrote:
> > > According to Motorcycle Consumer News the GTS was
> > > produced by Yamaha from
> > > 1993-1999......of course 1993-94 to the USA. I think
> > > the EUs elimination of
> > > the 100 hp limit sealed the GTS doom in Europe.
> > > Mark Evitts
> >
> > Good point Mark. Just another reminder of the factory
> > detunning of the YZF 1000 sportbike engine. I still
> > believe, the GTS has untapped potential to increase
> > it's HP/ TORQUE without sacrificing reliability.
> > With 10 yrs. of technology improvement in parts,
> > adapted from the Thunderace, we can have our cake
> > and eat it too.
> >
>
