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.