My RX7SP build up

[RICE RACING]

I have a fair bit of information to pass on (need to collated it first) but here is a quick rundown of today’s work.

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

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 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 ¼ 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.

[RICE RACING]

Polished the bad boy today, fucken in love

[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]

305rwkw as measured by me

Did a 90-140km 3rd gear test but battery went flat before all data could be written *I know excuses lol* covered the speed increment in 85m, previous best was 88m, off ECU data logging and given this distance its around 2.62 seconds which is Ferrari F40 beating territory.

Boost on 3rd gear pull from 2500rpm
130kpa (18.9psi) ~ 4400rpm
145kpa (21psi) ~ 5000rpm
holding to 8000rpm
Turbo speed is 110,000+rpm now lol
EGT fr 928 deg C rr 930 deg C peak.
AFR 11.3:1

After the boost controller learned the new spring the power delivery is so violent in 2nd gear even with warm semi slicks it just throws the car sideways down the road and leaves two black lines on the road its sick

From my best estimates its making around 490bhp to 500bhp at the engine corrected to std temp and pressure. Through a full catalyst equipped exhaust that is very quiet for road running *sounds nice at full power and revs* Engine has logged over 100 hours of use now at pretty high power settings, covered over 5000km testing.

Hope to update with some nice VBOX graphs soon, though the weather here is shit at the moment, stupidly hot and monsoon conditions daily

[Ian]

Man your car is sick clean. Nice to see your putting the effort in getting your car tuned right. Can't wait to have my car put back together. Had it apart for painting....

[llRyOsUkEll]

That is a impressive set up man. I have to agree, thats a nice air box you got there