RICESP Water Injected RX7

[RICE RACING]

Probes tested and fitted up, interesting note they 100% read lower than the much thinner exposed types I was using before (I estimate around 50deg C for same conditions with bench tests) will confirm in car in next week or so.

New mods and set up looks great fixed up all the little details I wanted to do since the major re-engineering of the initial set up she should be a rocket! I'll post up all the performance statistics sooner rather than later I hope........ I can't wait. The Ferrari F40 is going down !!!!

[RICE RACING]

Drove her today its sweeter than a fat chic molesting a bucket of KFC!

Little louder at cruise with new turbo, runs better, cooler, fixed the hot start "clicking" *boiling near thermostat* due to wrong water line mountings in first install 21:
New EGT probes are sweet too. Cleaned some items and reworked a few bits I was not happy with and it came up pretty good


arty:

[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.

[RICE RACING]

Boost re-learn at 1.35kg/cm
3rd gear pull from 2500rpm = 1+ bar or ~15psi boost by 4300rpm
4th gear pull from same revs = 15+psi by 3600rpm[/i]

VBOX3i results (on boost learning) max boost at this stage was like 1.25kg/cm or about 17.2psi
90-140kmh = 2.88 seconds, showed 272rwkw on Blitz power logging at 6800rpm and same power on my VBOX dyno plot (272rwkw @ 7000rpm)
Repeated same test in exact same location as the small incline (so I could overlay graphs and see difference to flat piece of road and it ran 3.07 seconds (v?s the 3.25 yesterday) exact same vehicle weight (cross checked on corner scales this morning ).. AFR on these pulls was 11.1 to 11.0 across the range all smoothed out and boost was pretty similar to the first run where I did the comparison for you.. so trim of fuel mixture helped the time improvement.

So after lunch I poured over the data and did some more trimming (2% reduction of fuel map) and went for a cruise. I gave it a few hits and it felt unreal in 2nd gear :auto: and partially in 3rd as well, on the way back on a nice stretch I pulled out to pass 3 cars and gave it the jandle from 3000rpm to 8000rpm and it was so strong! Stronger than a fat slut bench pressing buckets of KFC!!! The on board power meter showed 298rwkw @ 7200 rpm and held over 280rwkw to 7800rpm with don mega mid range power too. Boost was 1.35kg/cm or 19.2psi on the Blitz dyno graph log at these revs. So another 0.10kg/cm boost and a small fuel trim (along with refitting my old ignition timing map) made all the difference, oh and I turned the RRWEP110 down to 3.5 turns. AFR across board from 4000rpm to 8000rpm (75kpa to 140kpa gauge boost) is ~11.2:1 +-0.1.

I?ll wait for a cool morning and take out the 20kg worth of spare tire, tools, fire extinguisher! And run it at ? tank of fuel and I should beat my 2.75 second 90-140 record. As a side note when I was at track and it was doing 90-140 in 3.05 second range, I did 100kmh to 200kmh in 8.1 to 8.2 seconds range at same weight (1350kg total). I?ll hope to do this in 7 seconds flat now as now I can hold 4th gear due to the much better top end power with no loss of 4700rpm to 7100rpm power range (as measured in the 90-140 tests in 3rd gear).

It?s a win mate. Best power yet (nice increase with detail turbo<turbine modifications), much better power band to suit gearing with no loss of mid range at all. When the opportunity presents I'll do a full performance test and post up the information

[estorvito]

nice

[RICE RACING]

Came a long way from this initial test run below

Originally Posted by RICE RACING

Well Finally ! Tested & Finished *taken from another forum I posted up details, for reference this is a list of other cars at bottom of this page that I test to give relative performance in mild state of tune. Could will go even faster on same boost as at end of third gear it (last 5kph) got into higher EGT and the ECU increased the fueling (making engine too rich 10.6:1) to cool the EGT down (cost ~20rwkw in upper revs power), I have since redone the table to allow a higher EGT setting before automatic fuel enrichment will occur.

http://www.riceracing.com.au/vbox-ii...ing-tuning.htm

Logged the SP this morning and did some back pressure testing for SMB on the mid section street exhaust.

3rd gear 90-140 time of 3.11 seconds on 14.1psi boost pressure RR Water Injected,
Turbine speed 91068rpm
132kph = 0.443G < (10% more acceleration at same speed as ONE58 when I logged it at 12.2sec @ 118mph on street on 1.1bar boost on twins FMIC etc, driver only in car)
Turbine inlet pressure 12.0psi
Exhaust back pressure 2.63psi
6681rpm
11.36AFR
EGT 985deg C
Fuel pressure 64.98psi
Full boost = 3700rpm
Ambient temp 10.6deg C
Inlet manifold air temp on fast acting sensor = 32 deg C
need to do up the graphs, exhaust back pressure at 240rwkw on VBOX was 3.0psi @ 7500rpm (which I would class as quite good for 2 mufflers and a catalytic converter & plumb back waste gate set up).

[thefalls]

Thats a very very clean engine bay.

[RICE RACING]

Polished the bad boy today, in love !

[thefalls]

Does this car ever see the road? Hehe... very clean i must.
Any tips to the engine bay so clean?

[RICE RACING]

I did about 300km in it last week *covered ~5000km in past year*.
each time I wash the car I try for every second/third wash to do the engine bay, just a bit of extra work and shamy it dry after I do the body work (with its own shamy I use on the wheels). I do love the car, its been a long term project of mine (for last 6 years) and now I am very happy with it, by no means is it perfect or a show car in anyway but as an all rounder that I 100% built and tuned myself that is near my performance goals it brings me much joy

Today I ordered some new spark plugs from Japan (different heat range). Last week I also procured a new set of springs for the waste gate valve, although its fully electronically controlled I am setting on a new higher boost base setting and the increase in mechanical spring will be of benefit. Also finishing off a part I wanted to do on the oil system, and some final settings on the RRWEP110 for the latest specification of the engine set up *Higher Performance Setting*

When I complete that (pending parts delivery) I want to do a proper write up summarizing all of the finer detail and the performance measures of it in this final stage. Till then I'll enjoy a nice weekend of driving ................... (try not to get engine bay too dirty!).