RICESP Water Injected RX7

[RICE RACING]

Got a phone call this morning at 7.am from a friend inviting me to go to the local 1/8th mile drag track (owner of it was running in his rail flat head supercharged methanol V8!). Could not resists so I quickly hooked up my new car trailer and loaded the Mazda on and went there.

Got a chance to run my car down there and practice some launching techniques, the thing is unreal 1st gear taking off simply requires a bit of clutch slip to preserve the gearbox and differential, letting the thing fully engage at 3500rpm or so it got such a great spread of power that it just spins the tires all the way through first, second gear grips up and third it was pulling near 8000rpm at the end of the 200m (100mph or so). Took max revs to 8500rpm and the hard work on improving the mixture at the higher revs did help, my passenger commented that it just keeps on making power and theorized it should be able to pull to 9k rpm hahaha (I informed him that was not recommended or needed). He was totally amazed that a road car with full legal catalytic exhaust and moderate noise level on ~17psi boost accelerated so well.

Riding in passenger seat he said in 3rd gear in last half of the track it feels as fast as his 6.7 second drag only 6cy turbo car, it was very hot today (maybe 30 deg C in the sun) on board power meter was showing 281rwkw @ 7700rpm. I took him for 3 runs back to back then did 3 or so on my own and it performed faultlessly. We have a drag event there on the 4th of April and am confident to show up and not make an arse of myself with a car that is too slow *I have VBOX tested his drag car, 36psi boost, methanol, 3300cc straight 6, tripple SU carb draw through turbo set up 1008kg car, making measured ~250rwkw 6.75 seconds @ 106mph in 200m test.*

Will have to implement the launch control system and also use staged boost in the hope of trying to get some better take off's........ though its not really made for that kind of activity at the end of the day it was allot of fun regardless. Will have time to instrument the car before that event and will get the VBOX data of 0-100kmh times and other performance measures also. The traction control was too invasive on initial take off and since I had not configured the launch control yet I turned it off totally on today's tests, the one thing I did learn is the fitment of the new Ohlins suspension full cured the cars tendency to wheel hop on take off wheel spin, it just sits flat and you can modulate the throttle and wheel spin with zero wheel hoping which means reduced drive line stress.

[RICE RACING]

Did a 0-100kmh test today.

Bogged it badly, Launch Control was not working so on take off the Traction Control setting of 3800rpm minimum engine speed activated and for 0.5 seconds car just rolled on at a constant massive 10.90kmh , first to second shift was 0.620 seconds before it started accelerating again (did not use flat shifting feature) to be brutally honest it was an arse fest of an attempt!!! Got 5.39 seconds

Have since re adjusted the TC setting and lifted minimum engine speed activation to 5000rpm (so motor wont cut out) and increased variable boost to speed setting from 0.8bar 1st gear, 1.0bar second gear) to 1.0bar first and 1.2 bar second.

Hoping it will do ~4.0 second range or maybe crack a high 3 if I manage to perfect it.

[RICE RACING]

Got a chance to do a run today at 1335kg test weight (27deg C day). Redid a few setting (still no flat shifting) Start procedure was release clutch at 4500rpm *no slipping* bit of wheel spin and engine dropped down to 2800rpm.......... Managed 4.40 seconds for 0-100kmh time. (will post up a graph report when I can).

There is probably 1/2 a second in refining technique and also working out boost control, as it was quite low in 1st gear and mid way through 2nd gear (1st 6psi below 4k rpm & 2nd below 12.5psi under 6k rpm). Probably best to leave boost control at the 1.2kg setting and not using variable speed boost and let the traction control modulate the power rather than the boost controller as its much much faster and more precise.

I can run 40kg less weight too reduce fuel 20kg and 20kg of spare tire, jack tools etc... Maybe high 3 sec is possible on road tires

[RICE RACING]

Here are the files, self explanatory really


Note full power not achieved in 2nd gear, in 3rd showed 273rwkw on VBOX and 276rwkw on power meter (as per averages to date)

More detail of average power delivered, start RPM and drop down in 1st gear, showing car was not abused to get the time .......... there is some more left there as can be seen, nothing some more fine tuning of settings and technique would yield.

[RICE RACING]

Originally Posted by RICE RACING

Got a phone call this morning at 7.am from a friend inviting me to go to the local 1/8th mile drag track (owner of it was running in his rail flat head supercharged methanol V8!). Could not resists so I quickly hooked up my new car trailer and loaded the Mazda on and went there.

Got a chance to run my car down there and practice some launching techniques, the thing is unreal 1st gear taking off simply requires a bit of clutch slip to preserve the gearbox and differential, letting the thing fully engage at 3500rpm or so it got such a great spread of power that it just spins the tires all the way through first, second gear grips up and third it was pulling near 8000rpm at the end of the 200m (100mph or so). Took max revs to 8500rpm and the hard work on improving the mixture at the higher revs did help, my passenger commented that it just keeps on making power and theorized it should be able to pull to 9k rpm hahaha (I informed him that was not recommended or needed). He was totally amazed that a road car with full legal catalytic exhaust and moderate noise level on ~17psi boost accelerated so well.

Riding in passenger seat he said in 3rd gear in last half of the track it feels as fast as his 6.7 second drag only 6cy turbo car, it was very hot today (maybe 30 deg C in the sun) on board power meter was showing 281rwkw @ 7700rpm. I took him for 3 runs back to back then did 3 or so on my own and it performed faultlessly. We have a drag event there on the 4th of April and am confident to show up and not make an arse of myself with a car that is too slow *I have VBOX tested his drag car, 36psi boost, methanol, 3300cc straight 6, tripple SU carb draw through turbo set up 1008kg car, making measured ~250rwkw 6.75 seconds @ 106mph in 200m test.*

Will have to implement the launch control system and also use staged boost in the hope of trying to get some better take off's........ though its not really made for that kind of activity at the end of the day it was allot of fun regardless. Will have time to instrument the car before that event and will get the VBOX data of 0-100kmh times and other performance measures also. The traction control was too invasive on initial take off and since I had not configured the launch control yet I turned it off totally on today's tests, the one thing I did learn is the fitment of the new Ohlins suspension full cured the cars tendency to wheel hop on take off wheel spin, it just sits flat and you can modulate the throttle and wheel spin with zero wheel hoping which means reduced drive line stress.

^ Found this old post of mine from my friends Drag Highlighted car we VBOX tested
RICESP is allot faster now then when we had this little test day (from March last year) at the strip where he went in the passenger seat We took him for a drive a month or so ago at a few levels down from where it is now and he said it was much faster than his drag car (seat of pants acceleration) need to post up the VBOX figures across the test increment, picture is worth a 1000 words

[RICE RACING]

So here is a report showing a mates drag car v RICESP
RICESP = 2.57 seconds (just in one gear, great show of power band)
Simon Ward = 2.64 & 2.69 seconds (high power at start of test, then less grunt shows up at higher speed, gear)
Drag car specs:
3.3lt Holden 202 (very old school set up!)
5 speed Lenco clutchless shift gearbox
1007kg car (1077kg as run in this test)
35psi boost (see logging)
Ran 6.75 @ 107mph 1/8th mile goat track in this VBOX file at night (won the event lol) *2 back to back runs*

RICESP: is the 2.48second 90-140 test std (3 gear acceleration test)
1310kg run weight Specs listed many times already!

Here is a pictures of the car. Bloke is a local legend, basically wins against all comers (I'm serious) has been running at that track for 30 years! Oh and his beast is water injected too :hurray:

I helped him jet the carburetors and set the ignition timing on it till it got as fast as it would run Via the VBOX logging, this was done during the event and these final two runs are back to back from the evening finals (night runs interesting with no head lights and poor track lighting lol!@!! (have no mph boards at local Goat track! so VBOX is invaluable! Tim cards work but run faster at track due to roll out ghetto timing lights common to ALL Drag tracks, VBOX shows slower times (depends on how deep you stage!) always as its recording exact start & not guessing like light beam bullshit!) he was amazed with what "modern technology can do" BTW it has no wastegate so the boost is max it will run!!!

[RICE RACING]

This is another interesting comparison: From my collection of VBOX tests http://www.riceracing.com.au/vbox-ii...ing-tuning.htm
90kmh to 135kmh (best power gearing for the stock RX7) see rpm logging.

RICESP V Spirit R Type A (stock standard)

Car specs:
Spirit R Type A
1335kg as run
280PS factory rated engine (100% stock std no mods at all)
Car ran 0-100kmh in 5.55 seconds & 13.85 second @ 104.78mph RR V-BOX Recorded for 1/4 mile *no roll out*
Time = 5.06 seconds & 158 meters

RICESP:
~21psi Rice Racing Engineered Water Injected Monster
1310kg as run
Power is over double a factory RX7 (see actual VBOX RR rwkw measure) so roughly double the power, double the acceleration & half the time required to do it and distance as well
Time = 2.21 seconds & 69 meters

VBOX File report

[RICE RACING]

Here is the 3 rd gear acceleration of the stock RX7 SP, tested by Motor Magazine with Correvit digital timing.

RX7SP stock 1995 test
204kw
276bhp claimed power factory rated engine (100% stock std no mods at all)

100kmh = 0 sec
110kmh = 0.87 sec
120kmh = 1.83 sec
130kmh = 2.84 sec
140kmh = 4.58 sec

RICESP
You guess the power

100kmh = 0 sec
110kmh = 0.51 sec
120kmh = 0.99 sec
130kmh = 1.51 sec
140kmh = 2.01 sec

[RICE RACING]

I just found 2 original issues of Wheels Magazine from 1996 where they do a Top Speed shootout of Australia's Fastest Cars. They are on their way to me when I get them will scan the full article and put it up.

Features my two fav cars of all time Mazda RX7SP and the Ferrari F40 and a whole heap of other vastly inferior cars They also feature acceleration tests too and I will post up some more comparisons