downforce from original spoiler or wing?
12-20-2011, 07:40 PM
#21
I'll just leave this here...
And for the record, this guy is for the most part the most knowledgeable on RX7club.com when it comes to suspension and aero set up.
And for the record, this guy is for the most part the most knowledgeable on RX7club.com when it comes to suspension and aero set up.
..............................
AERO is HUGE above 55 mph and goes up at a cube rate. it doesn't take much to upset the delicate longitudinal balance.
AERO STORY:
Runoffs at Road Atlanta. my RX3SP gridded 4th after the first of two qualifying sessions. i asked my engine guy Daryl Drummond what he would think about removing the tiny little rear (OEM) spoiler pop riveted on my rear deck. Daryl asked me what rpm in top gear i was running at the bottom of the hill. i said 10,000. he figured i'd pick up another 300 rpm. the engine was drysumped and running 12 quarts of oil. Daryl figured it would be 50/50 the motor would live as it was already cranking big time down the long back straight. since we had another engine in the truck we removed the rear spoiler.
the spoiler didn't weigh more than 2 pounds!
out i went and did run 10,300 at the bottom of the hill BUT i could not hold the car at the very very slight, almost imperceptible bend leading to the hill. the tiny spoiler at about 140 was glueing the back end to the track.
on the other side of the track, down and up the hill thru the esses, the car was major loose and this was all 3rd gear!
after the session we pop riveted the spoiler back on.
it was tiny. it was out of the major air stream and it was essential.
i have huge respect for aero. that does not mean i am for spoilers. it is really easy to add too much drag or unbalance the car. i run the R1 splitter and no spoiler. the car is perfect in turn one at Brainerd at 165.
since you will have around 500 rwhp you probably have enough excess rwhp to use Aero.
i suggest you lose the 16KG rear springs and substitute 13 or 14. start at 2 pounds lower air pressure in the rear. then tune your aero. and do bring a pyrometer to the track.
good luck,
howard
AERO is HUGE above 55 mph and goes up at a cube rate. it doesn't take much to upset the delicate longitudinal balance.
AERO STORY:
Runoffs at Road Atlanta. my RX3SP gridded 4th after the first of two qualifying sessions. i asked my engine guy Daryl Drummond what he would think about removing the tiny little rear (OEM) spoiler pop riveted on my rear deck. Daryl asked me what rpm in top gear i was running at the bottom of the hill. i said 10,000. he figured i'd pick up another 300 rpm. the engine was drysumped and running 12 quarts of oil. Daryl figured it would be 50/50 the motor would live as it was already cranking big time down the long back straight. since we had another engine in the truck we removed the rear spoiler.
the spoiler didn't weigh more than 2 pounds!
out i went and did run 10,300 at the bottom of the hill BUT i could not hold the car at the very very slight, almost imperceptible bend leading to the hill. the tiny spoiler at about 140 was glueing the back end to the track.
on the other side of the track, down and up the hill thru the esses, the car was major loose and this was all 3rd gear!
after the session we pop riveted the spoiler back on.
it was tiny. it was out of the major air stream and it was essential.
i have huge respect for aero. that does not mean i am for spoilers. it is really easy to add too much drag or unbalance the car. i run the R1 splitter and no spoiler. the car is perfect in turn one at Brainerd at 165.
since you will have around 500 rwhp you probably have enough excess rwhp to use Aero.
i suggest you lose the 16KG rear springs and substitute 13 or 14. start at 2 pounds lower air pressure in the rear. then tune your aero. and do bring a pyrometer to the track.
good luck,
howard
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