Sam from Mana, the car and the rolling road…it was time to find out if everything done to date was gone to work.
First things first, some basic tuning to get the engine to run with popping and banging! That done Sam started to build up the RPM modifying fuelling and timing until the engine started sounding like it meant business! Obviously all we wanted to know was how much power? …but we had to be patient, very patient.
A few ear shattering hours later we where ready for a power run, for now just with the main set of injectors working and limited to 12,000 RPM. The result did not disappoint, despite a curious dip in torque and power at 10,500.
The dip was caused by the Yamaha’s extending inlet venturi, which are triggered at around 10,000RPM. So more work from Sam to smooth that out and we had a map that work well enough for a trip to Blyton for a quick test.
First test with the new Yamaha engine on a bitterly cold, damp day at Blyton.
On the rolling road we could only cool one rad, so water temps and oil temperature where climbing rapidly under high revs/load we figured that would be fine on track…wrong!
Quick Summery of our first test – reasonable happy with the day.
Bad news: Engine temps in the low 90’s but oil temps rapidly showing as over 130˚C! (see previous article for the reason)
The good news: Compared with the L3 GSXR we had more power and torque!
Bad news: Ran like a bag of spanners under 6,000 RPM and was difficult to start.
Good news: The gear shift system worked really smoothly. Just an issue finding neutral and slow speed down shifts.
More Good News: Sounded amazing…if a little noisy! So different to the ‘traditional’ GSXR sound.
Back home to re-configure rads so water from both rads cool the Laminova and book another session at JamSport for start-up and low RPM mapping…simple.