Project; Turbo GSXR Slingshot

Few more alterations before its MOT in the morning, moved the oil cooler now the headers are slimmer.

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Also fitted a temporary expansion tank now the oil cooler isn't under the seat. Will make up a smaller one soon and also a catch can for the breathers.

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Got a meet this weekend so will hopefully get some road miles on it.
 
Passed its mot earlier, taxed it after and took some main roads back.

Runs much nicer than before and its much smoother at slower speeds, fairly smooth once the boost kicks in and pretty quick as well!
 
Understandable after your little mishap!

The up pipe sticks out further than the fairing so I may make a cover for it when the fairing lowers go on to tidy it up.

Certainly wouldn't want my leg under that with a bike on top of it....
 
So cold starting is getting better, needs very little extra fuel.
Also starts reliably at a good range of temps.

Seems a little fluffy at steady low rpms but even slight load cures that.
Also need to wear ear plugs, its a bit unsociable....
 
Managed about 250 miles over the weekend. Took it in the van up to Keswick where I met a couple of mates and rode with them up to Moffat leaving the gf to drive the van up.

Had a good 150 mile ride out on Saturday as well, both rides had mostly rain and hardly any dry roads so it was a good shakedown weekend.


Found a problem before we even set off from Keswick, with the lights on and idling the alternator doesn't produce enough power and drains the battery!

Also the same when the fan kicks in, battery voltage drops to 11.9v on idle.

Its fine once revs pick up but I could do with more power at low rpm.


Only other problem was the little rubber cup over the oil pressure switch, filled with water and shorted out the switch. Killed the bike as soon as I seen it and only took 30 seconds to find the problem but it had me worried while I coasted to a stop.


Got 120 miles to 17 litres of fuel so its a bit thirsty.
 
Brakes are pretty damn good, don't normally brake really hard but I tried a few emergency stops if you like and it pulls up very quickly.
Much better than the standard 1100 but don't know how it compares to modern bikes.

Need some stronger adjuster bolts on the swing arm, even with the wheel spindle FT it bends the adjuster bolt on the chain side.
 
Lakeland said:
Any updates @Danm54 ? Must be nearly done now :p
Click to expand...

Its taken a back seat over the winter to be honest.
Sadly Dan Hegarty died at Macau last year so tuning stopped then and I've not touched it since.

I've found a local guy that has a dyno and has played with forced induction in the past so its booked in for a base run on Friday. Will go into ignition timing with him and may also play with the cam timing too, its very loud currently and I think thats down to cam timing.

Will keep you updated.
 
7 years after I started this thread, here's a dyno graph!

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With some air temp and humidity corrections the next pull was 198bhp. Think the slight dip is where its running a little rich, will go more into it on the next run.

The line at the bottom is drivetrain/transmission drag which max at 15bhp so its 213bhp at the crank.

Lost 2 header bolts so I need some lock washers or I might find some locking tabs and use hex heads instead.

Mark said to put the intake cam at 110 degrees lobe centre and see how that affects it. In theory it should make a little more power and run smoother at lower rpm.
 
Yes I've done a few miles on it, went to Scotland for a couple of days last year so took it up most of the way in the van then went on a few ride outs.
Its had a few trips out locally as well.

Surprisingly it's quite easy to ride, the power comes in smooth and controllable but obviously its damn quick.
Was looking through the ecu stats last night and its spent most of its time between 5-20% throttle. Need to change that this year.
 
moykky said:
Hi.
I just read whole topic and I have to admit you've done amazing job.

Would you mind sharing your tuning files?

I have a plan to build 1216cc turbo with Microsquirt,
I also have a project making a 749cc to ~1004cc without turbo but fuel injection.
Click to expand...

The Microsquirt never really had any tuning as it was so intermittent and unreliable. I've since bench tested it and it powers up and connects to the tuning software so I'm not sure how broke it really was.
 
acemastr said:
Torque is pretty good, otherwise the figures aren't as high as I was expecting
Click to expand...

I was expecting around 250 to be honest, I think there is still more to be had as it's only the fuel map thats been tuned so far.
There's still cam and ignition timing plus acceleration fueling to set as well.

I've actually set the fuel map to MAP vs RPM instead of TPS vs RPM.

There were areas higher in the rev range where if you held the throttle steady and the turbo spooled down, it would run really rich when you opened the throttle again.

MAP vs RPM should eliminate this and with acceleration fuelling set up it shouldn't hesitate when you open the throttle. Thats the next step anyway but as usual finding someone with a dyno is the problem.
I'm looking at making an inertia dyno that will help me do most of my tuning at home.

A house move is currently taking priority so most projects are on hold at the moment.
 
IC3 will be happier with the exhaust now!

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Decided I really need ride this more this year so I've gone back to the working tune using tps/rpm and allowed the wideband to auto correct up to 60%.

The battery has been playing up recently so I've gave it a good charge and hopefully it'll be ok. Need to book an mot on Monday then get some miles on it.
 
The battery didn't hold charge overnight so ordered a new one.
Also ordered a pair of mirrors to replace the single mirror that folds in all the time!

While the battery was low I decided to set the injector dead time correction even though it should have been done. The bike idles smoother now and stays running with the battery at 10v which is about when to used to go lumpy and die.

Also got the fairing lowers trimmed around the exhaust, clutch cover and oil lines. They're not brilliant as they've been cut before but they're on.
 
Passed the mot fine as usual. Taxed it after and went a longer way home.

Didn't like traffic which is normal but it died a couple of time when coming to a stop. Seemed better after some boost on the open road but rpm was still dropping low so decided to have a look at the idle control.

Set that up now so it'll alter ignition timing a little to maintain the correct idle speed. Maintains a nice idle so will see how it is next time out.
May also help cold starts as it always like a touch of throttle until coolant gets to about 40 degrees.
 
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