My RX7SP build up

[RICE RACING]

Bitches love fisting

[RICE RACING]

Here is "finished" engine bay pics

[RICE RACING]

I have a ram air sealed air box for my turbo inlet, there is a carbon duct going down into the nose cone main entry that feeds the air box, I should fit up a pressure sensor there and do some high speed tests.





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).

[RICE RACING]

Bitches love fisting

[RICE RACING]

Here is the Kerb Weight of my RX7 SP (totally full fuel tank, all fluids, tools, spare tire etc, ready to run). My car has a 100+liter carbon fuel tank (you can see it just poking out the bottom left rear of the car) :smile:

2826Lb or ~1282kg as pictured.

(minus spare tire, tools, jack etc = 1264kg)

[RICE RACING]

This may be of interest to some people, I still like to look at spark plugs after a long drive or extended use at a new setting on the engine parameters generally half a dozen full throttle applications is enough to establish what is happening via colors etc.

For those not familiar with rotary engines: (leading plug holes have a large opening to the combustion chamber and trailing plug holes have a smaller shielded hole) I use this visual check + EGT reading to balance any differences in the fuel air balance.
FL = front leading spark plug
FT = front trailing spark plug
RL = rear leading spark plug
RT = rear trailing spark plug
NGK 10 heat range plugs are 2000km old, run a 0.020" gap, Optimax Shell 98 Ron fuel, Mobil 1 engine oil (oil injected into motor), and Sthil 2 stroke premix at 180:1 mixed in with fuel also
10.9:1 AFR with 1.20kg/cm boost and 500cc Water Methanol at 50/50 mix, engine operating temp is 77~79 deg C

In case anyone is bored! Look On !!!


Front Rotor



Rear Rotor

[05rex8]

impressive!

[djmtsu]

Wow!

[sk8world]

"very" nice work!!!!!!! Some of the best forsure.

[RICE RACING]

Thanks for the nice words, its a pleasure to share this on overseas forums v's the rubbish in Australia (every second person here is a hater, especially in forum world).

I did what my limited skills and experience would allow, I am happy with the way it turned out and as I'm sure all of you can relate the best bit is driving her again and feeling the rotary power.


I'll keep updating when I have more stuff to share

[scotty305]

Great thread and nice photos.

It's not completely clear from some of the photos, are you measuring exhaust backpressure at each of the runners, or pressure pre- and post-turbo? Also, is that a turbine speed sensor installed in the compressor housing?

[RICE RACING]

Originally Posted by scotty305

Great thread and nice photos.

It's not completely clear from some of the photos, are you measuring exhaust backpressure at each of the runners, or pressure pre- and post-turbo? Also, is that a turbine speed sensor installed in the compressor housing?

Turbine inlet and Turbine outlet pressure are measured, EGT is measured on each rotor.

Turbine speed sensor is in compressor housing, correct.

[RICE RACING]

Bitches love fisting

[Herblenny]

Impressive..

I am intrigued by this.. Can you tell us bit more about why this type of set up?

[RICE RACING]

Originally Posted by Herblenny

Impressive..

I am intrigued by this.. Can you tell us bit more about why this type of set up?

Overall? I wanted single turbo as its more reliable than twins. All the other stuff to do with data collection was for my own development stuff (I must put up the VBOX equipment and logs).

The ignition system set up was a thing I wanted to try myself (I currently do not run this due to a compatible issue with the ECU type I run and CDI ign systems so at the moment the trusty HKS DLI is installed with stock coils/wires etc). The idea is to have massive spark current/voltage and limited RFI (which I achieved) however CDI systems do not work as well as inductive at light loads and low rpm *even with multi spark* (HKS is superior), at the moment with my 50/50 water to methanol mix at 500cc/min the HKS DLI works perfectly and the car runs better on this ign than the race CDI spec set up so that is why I changed back from my expensive time consuming custom CDI coil on plug set up. *This pictured system does though fire a much stronger water only injection set up at almost double the flow rate* but due to my Link ECU not working with it (any similar full CDI system, tested with Motec, M&W, Dynatek) on the activation of a rev limiter or boost limiter its unsafe to run in all conditions.

All the other system parts IC set up, carbon air box etc are factory SP items on this very race car so wanted to retain the stock look of the car. My performance goal with it was to match a Ferrari F40. Looking to obtain ~500bhp *engine power* and a responsive engine to get to do 128 to 130mph trap speed in the 400m or 1/4 mile measurement with normal road tires (no quasi drag stuff needing burn outs etc etc).

She is set up as a road race car as you would call it.

Hope this gives a general over view.

Peter