[RICE RACING]

Here is some preliminary information comparing two different specification (turbine section) Turbochargers.

1.00A/R Garrett T04Z (from circuit test)
RRWEP110 = 3 turns
266 rwkw @ 6950 rpm AFR 11.35:1
Boost 18.45 psi
Turbine inlet pressure 17.1 psi
Exhaust pressure 4.06 psi
Turbo speed 101803 rpm
90kmh-140kmh = 3.05 seconds (flat track)
EGT = failed probe after 35 hours (was around 1000 or so at lower boost and power)

modified turbine specification (today run)
RRWEP110 = 4 turns
268 rwkw @ 7250 rpm AFR 11.0:1 (1.7 degrees less timing)
Boost 16.72 psi
Turbine inlet pressure 14.43 psi
Exhaust pressure 4.03 psi
Turbo speed 101000 rpm
90kmh-140kmh = 3.25 seconds (10% incline rose 9m in 100m of test) *minus the incline these times are net equal from my experience*
EGT Fr 875 deg C
EGT Rr 885 deg C


I wanted to be careful so I richened up the car and also took a few percent off the timing, the fueling curve is not optimized like it was on the smaller turbo, I have refined the mapping and also have reset the boost controller so it can learn the pattern of the new turbo from scratch then it will on a flat road perform better in like conditions to the 1.00A/R set up. Car has more top end pull as is and when the boost learns the loss down low will be marginal.

You can see from the figures, that the Exhaust pressure *indicator of mass flow* is near identical for them both so this is one of my many cross checks to make sure no spurious figures are around, also the Turbine RPM is basically the same as well though this turbo has an aero nut V?s the other which when rebuilt had only a normal hex nut (whatever if any difference that makes lol). The Turbine inlet pressure is definitely less as you can see from the figures and despite the non optimized tune up it makes the same power and at high rpm so the engine is less restricted by this exhaust housing (which matches with the theory 100%) the car on power is QUIETER with this set up *unless I am on drugs* my theory on this is because less mass flow is going out the waste gate pipe (more through the turbine) and this must be making the car less noisy at full power as all other things are exactly the same from last time.

I have reset the boost controller to learn 1.35kg/cm which equals 19.2psi, with the slightly tweaked set up (back to original timing) half turn less on RRWEP110 injector (down from 4 full turns) and tidied up spots in rpm range to give perfect AFR line (target 11.2:1 to 11.3:1 AFR) it *should* get to around 290rwkw on my VBOX measure (this is like 319rwkw on homo dynamics?)????.. anyway hope I have not bored you to death!!!!!!!!!!!!!!!!!!

When I get around to driving it again will see what she does, should not be long as I have all the VBOX gear fitted in her so it?s just a matter of driving it. My best 90kmh to 140kmh time is 2.75 seconds at lower fuel load, flat road, (18psi average boost) and non heat soaked engine.