Fuel system up-grade?

[Maj]

The s2000 injectors are 380cc (std 240), which will do about 300hp with a 1:1 reg,at std pressures, trouble with a pc is its tps reactive, for a given throttle position you could have a wide range of boost levels and fuel needs depending on load

I was testing s2000 injectors with a modified map sensing pc3usb and 1.7:1 reg today
realy notice the big injectors at cold start when ecu richens the mixture, and on closed throttle overrun .. but not too much just runs a bit rougher for a bit cold and pops (probably flames at nite) on overrun otherwise its running good, still have a bit of tuning to do but i like the results so far.

Biggest thing i'm waiting for is to reprogramme the std ecu, (coming soon) be able to fix these sorts of probs easily, like available on many other bikes now.

[suzi1723]

The s2000 injectors are 380cc (std 240), which will do about 300hp with a 1:1 reg,at std pressures, trouble with a pc is its tps reactive, for a given throttle position you could have a wide range of boost levels and fuel needs depending on load

I was testing s2000 injectors with a modified map sensing pc3usb and 1.7:1 reg today
realy notice the big injectors at cold start when ecu richens the mixture, and on closed throttle overrun .. but not too much just runs a bit rougher for a bit cold and pops (probably flames at nite) on overrun otherwise its running good, still have a bit of tuning to do but i like the results so far.

Biggest thing i'm waiting for is to reprogramme the std ecu, (coming soon) be able to fix these sorts of probs easily, like available on many other bikes now.

I was just curious as to how this setup would be received, as it's been used for about 9 months now with good results, with boost ranging between 8 & 20psi. 20psi made 297hp with 60kph of tyre slip on the dyno roller. It's had a failure early on, but this was due to a kinked the water injection hose and not as a result of a tuning problem. The bike rides as well as a stocker does, fuel economy is on average is as good or better than most. Recent shop ride of 280km, the distance was evenly split between WOT and cruising through known radar haunts, it actually bettered the economy of other Busas's on the ride.
How does this fuel comsumtion compare to others?

Al.

[Maj]

Thats good economy , usually turbo and economy don't go together, although i usually get better on my turbo bike (secondarys) than a mate on his std zx12 when were on long rides with a mix of riding.
If your system works, thats all that counts,
Be carefull if your mapped on a slipping wheel, actual needs will vary lots from your results, killed my busa on the salt first year after mapping without being tied down enough, real world needed more fuel.....would have thought that 20 psi is rather high to get just under 300hp but dyno's vary and so do turbo sizes and gauges, usually look to ~15 psi for 300hp (2 atmosphere's absolute should net ~2x std hp)

Done a second tuning session datalogging the s2000 injectors now , only prob is the crosswind today ... getting a bit slappy , but the mixtures are very close now, bit of fine tuning off boost and then put in the race fuel and finish from 10-20 psi when the wind drops.

[suzi1723]

Mapping took 3 days, using a Dynojet 250 eddy current dyno. Literally going through the rpm range 500 rpm at a time, rolling on throttle aswell cruising throttle to get tune right. Hence the economy, power and ridability. As for tyre spin on the roller, it just destroys 014 Bridgestones and only after mapping finished. But then the bike does that at 260kph in top gear on the road.

Al.

[suzi1723]

Our dyno is particularly harsh, around 8-10% due to atmospheric conditions. Interestingly, a guy up here has SuperFlow engine dyno and he experiences the same. 8OOhp on his will show 900hp on the same dyno and software in Brisbane. Wheel spin at this level will account for about 30hp, this particular bike will go 330-350 on a dyno in Brisbane. Would make more hp with a bigger compessor but it's a street bike and it has enough, 8psi is good for 260hp. On my turbo funnybike I'm losining 100hp in tyre slippage, 30pi = 480hp, just have to sort some chassis kinks out. With the slick we only tie it down enough to hold it straight and allow the tyre to grow. With street tyres, we've found sticky tyres aren't any good as they ball up and cause more slippage. slightly harder tyres are a little better.

Al.

[Maj]

Good, someone who understands and has a dyno... few and far between..
Where are you ?
I have an old touring tire for the dyno, lasting surprisingly well, but only ever taken it to 400hp ...tire slipping limits .."yeah mate out dyno can hold 500hp (snickering in the background)" get there and only 2 light pickup points for tieing down, waste of a day traveling ,fuel... now i just ride them and datalog ..

[suzi1723]

Good, someone who understands and has a dyno... few and far between..
Where are you ?
I have an old touring tire for the dyno, lasting surprisingly well, but only ever taken it to 400hp ...tire slipping limits .."yeah mate out dyno can hold 500hp (snickering in the background)" get there and only 2 light pickup points for tieing down, waste of a day traveling ,fuel... now i just ride them and datalog ..

We're in Hervey Bay, Queensland.

[Maj]

Bit far for me, but handy for the QLD guys

[TheShredder]

We're in Hervey Bay, Queensland.

Is that funny bike green/silver?
I think i've seen you at willo before .
Do you know andrew with the turbo street busa up there?
I think he goes to that dyno shop


shane

[Busa05]

Thats my bike Al is talking about Shane . It also gets 24.6 km per lt on cruise . Cheers Andrew