RICESP Water Injected RX7

[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

[RICE RACING]

Originally Posted by 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 !!!!

In the 1000km of testing completed to date the exhaust gas temperatures have not exceeded 880deg C. Completed a proper longer haul load test to top of 4th gear (8000rpm) to get the highest reading as well. Normally peak in 3rd is around 840deg C in a near static load condition. Front and Rear rotor read the same to 0.5 deg C.

On cruising on stoich fuel mixture setting or leaner the EGT is over 100deg C cooler than before (on old turbocharger specifications). Fuel economy is flat out amazing ! including regular performance tests I average around 10lt per 100km.

[RICE RACING]

Well

Fitted up the new waste gate springs yesterday bought option of 1.3 bar and 1.4 bar Tail springs (combination of different inner and outers). I settled on the lower 1.3bar combo just in case they gave a higher set boost. Along with the new higher power setting I upgraded the specification of the spark plugs and some other details too.

Took the "beast" out for a drive today and the boost went to 1.53 to average of 1.50kg/cm! which is around 1.47 to 1.50bar! or old money 21+psi boost .......... it pulls like a mother fucker! First 3 2nd gear acceleration runs just torches the rear semi slick tires to 8000rpm, after about 6 or more passes and a few 3rd gear pulls the rear tires got very hot and sticky and could "almost" use all of the extra grunt in 2nd gear (only in straight line though and perfect road surface).... third gear is just stupid and is over in a couple of seconds, its very fast now.

Fuel duty before was around 67% > now 75% same AFR
Power on the Blitz was just under 300rwkw
Peak fuel pressure was 70psi now its around 75psi
EGT peaks have not gone above 890deg C

First cool morning will go out and do a test of the 90-140kmh and also do a 100kmh to 200kmh acceleration test report along with VBOX power graph.

[RICE RACING]

Boost learning procedure complete! 1.52kg/cm boost bro it is an animal

2nd gear just blows off the semi slick tires........... its unreal for a road legal 13B rotary set up, fastest most responsive true street set up 3rd gen RX7 I've ever been in. Making 305rwkw in my measure *estimate around 490bhp to maybe 500bhp @ std temp and pressure day* which was always an aim of mine.

90-140 test though not official time as VBOX battery gave up! *though it recorded the distance* was 85m. ~ 2.62 seconds. as a comparo 2.76 sec time covered in 88m and 2.82 sec time takes 90m. So its there ! on the ECU data speed sensor it shows ~2.5 seconds but this does not take into account wheel slip but its def legit......

Boost
130kpa (around 18.85psi) = 4400rpm
145kpa (around 21psi) = 5000rpm
144kpa held to 8000rpm

AFR around 11.3:1
RRWEP110 set to 3.5 turns
EGT 928 deg C and 930 deg C max

Hope to have some graphs up sooner rather than later, but all this would NOT BE POSSIBLE without the power of WATER INJECTION!!!! Over 100 hours on this engine and its perfect too

[RICE RACING]

http://www.youtube.com/watch?v=k2YVuJg4rSg

^ Here is the video, I am so happy with it, its as fast or faster than every Ferrari F40 I have on file (bare one test), faster than a Pagani Zonda (VBOX file of that one!).

[estorvito]

nice

[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?