Dumb Question Thread - no flaming or sarcasm allowed
#2176
Little reasearch and a little math later and I have some results
S1 Dif S1 trans; 16.6944, 10.07436, 7.326, 5.27028, 4.44, 3.74292
S1 Diff S2 Trans; 16.9386, 10.7802. 7.2816, 5.22588, 4.44, 3.69408
S2 Diff S1 Trans; 17.9352, 10.82313, 7.8705, 5.66199, 4.77, 4.02111
S2 Diff S2 Trans; 18.19755, 10.7802, 7.8228, 5.61429, 4.77, 3.96864
Top Speed@8500
S1 Dif S1 trans; 39, 65, 89, 124, 147, 175
S1 Diff S2 Trans; 39, 61, 90, 125, 147, 177
S2 Diff S1 Trans; 37, 61, 83, 116, 137, 163
S2 Diff S2 Trans; 36, 61, 84 ,117, 137, 165
Synapsis
S2 setup will provide better acceleration with a lower top speed.
S1 Setup will achieve slower acceleration but a higher top speed
It seems the best setup would actually be a S1 Trans and S2 diff, but considering the S1 trans is garbage compared to the S2 It seems that and S1 diff w/ a S2 Trans is the best all around setup, wish first gear had a little more output torque though.
Side note, if you are looking to enter the 200MPH club it is theoretically possible with a 3.9 diff(Mazmart sells) using either an S1 or S2 trans.
S1 Dif S1 trans; 16.6944, 10.07436, 7.326, 5.27028, 4.44, 3.74292
S1 Diff S2 Trans; 16.9386, 10.7802. 7.2816, 5.22588, 4.44, 3.69408
S2 Diff S1 Trans; 17.9352, 10.82313, 7.8705, 5.66199, 4.77, 4.02111
S2 Diff S2 Trans; 18.19755, 10.7802, 7.8228, 5.61429, 4.77, 3.96864
Top Speed@8500
S1 Dif S1 trans; 39, 65, 89, 124, 147, 175
S1 Diff S2 Trans; 39, 61, 90, 125, 147, 177
S2 Diff S1 Trans; 37, 61, 83, 116, 137, 163
S2 Diff S2 Trans; 36, 61, 84 ,117, 137, 165
Synapsis
S2 setup will provide better acceleration with a lower top speed.
S1 Setup will achieve slower acceleration but a higher top speed
It seems the best setup would actually be a S1 Trans and S2 diff, but considering the S1 trans is garbage compared to the S2 It seems that and S1 diff w/ a S2 Trans is the best all around setup, wish first gear had a little more output torque though.
Side note, if you are looking to enter the 200MPH club it is theoretically possible with a 3.9 diff(Mazmart sells) using either an S1 or S2 trans.
#2178
I noticed today that the fans were still running after I parked my car (series 2) and turned it off (normal coolant temps, max of 206F). I know that this is normal, and that the fans are suppose to come on to the medium setting when the engine bay temperature is above 220F. Would opening the hood to allow the engine to cool faster be a good idea (use less batter power because the cooling takes less time), make no difference, or be a bad idea (temperature of engine compartment drops, while the temperature of the engine/coolant inside it stays high)?
#2179
I noticed today that the fans were still running after I parked my car (series 2) and turned it off (normal coolant temps, max of 206F). I know that this is normal, and that the fans are suppose to come on to the medium setting when the engine bay temperature is above 220F. Would opening the hood to allow the engine to cool faster be a good idea (use less batter power because the cooling takes less time), make no difference, or be a bad idea (temperature of engine compartment drops, while the temperature of the engine/coolant inside it stays high)?
hope to hear from someone soon thanks
#2180
I noticed today that the fans were still running after I parked my car (series 2) and turned it off (normal coolant temps, max of 206F). I know that this is normal, and that the fans are suppose to come on to the medium setting when the engine bay temperature is above 220F. Would opening the hood to allow the engine to cool faster be a good idea (use less batter power because the cooling takes less time), make no difference, or be a bad idea (temperature of engine compartment drops, while the temperature of the engine/coolant inside it stays high)?
if your talking about after parking then yes (unless youre in a non reputable neiborhood)
i pop the hood while cruising at 30-40mph about a mile away from my destination on really hot days and leave it cracked untill i get back onto the road
everytime i get home i open the hood all the way
my fans ussually shut of 10 sec after i pop the hood whereas if i hadnt they would runn for a few min.
none of that is neccasary tho. if your cooling system is working then you need not worry
#2182
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I got a question:
What is the technical term for when you are driving through a long bend that is bearing left... think long offramp. Going about 60mph. Small bump in the road. Car suddenly feels light and feels like it is gliding or hops right. Very very short. No dramatic correction needed ... no loss of control ... easily 'corrected' by letting off the throttle. Wheels arent juddering, or skidding, or anything...Almost feels like the car literally slid a tad on ice.
Pretty sure that isn't bumpsteer as A. the RX8's suspension doesn't really exhibit bump steer issues, and B. my steering wheel doesn't swing in any specific direction.
What is the technical term for when you are driving through a long bend that is bearing left... think long offramp. Going about 60mph. Small bump in the road. Car suddenly feels light and feels like it is gliding or hops right. Very very short. No dramatic correction needed ... no loss of control ... easily 'corrected' by letting off the throttle. Wheels arent juddering, or skidding, or anything...Almost feels like the car literally slid a tad on ice.
Pretty sure that isn't bumpsteer as A. the RX8's suspension doesn't really exhibit bump steer issues, and B. my steering wheel doesn't swing in any specific direction.
#2183
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I got a question:
What is the technical term for when you are driving through a long bend that is bearing left... think long offramp. Going about 60mph. Small bump in the road. Car suddenly feels light and feels like it is gliding or hops right. Very very short. No dramatic correction needed ... no loss of control ... easily 'corrected' by letting off the throttle. Wheels arent juddering, or skidding, or anything...Almost feels like the car literally slid a tad on ice.
Pretty sure that isn't bumpsteer as A. the RX8's suspension doesn't really exhibit bump steer issues, and B. my steering wheel doesn't swing in any specific direction.
What is the technical term for when you are driving through a long bend that is bearing left... think long offramp. Going about 60mph. Small bump in the road. Car suddenly feels light and feels like it is gliding or hops right. Very very short. No dramatic correction needed ... no loss of control ... easily 'corrected' by letting off the throttle. Wheels arent juddering, or skidding, or anything...Almost feels like the car literally slid a tad on ice.
Pretty sure that isn't bumpsteer as A. the RX8's suspension doesn't really exhibit bump steer issues, and B. my steering wheel doesn't swing in any specific direction.
Cornering
In the end, road racing comes down to cornering. Assuming equal cars, the driver able to sustain the highest speeds through the turns will have the lowest lap times.
To get terminology cleared up first, every corner is made of three parts. We'll call them the entry, the apex, and the exit. The entry is where turning begins. The apex is the point where the car reaches the furthest point on the inside of the turn. The exit is where the car is driving straight again.
The objective in driving through a corner, or a series of corners, is to have the fastest possible speed at the exit of corner, or the last corner of a series. It is not necessarily to have the fastest speed going into the corner, nor even the fastest speed in the middle of the corner. The last corner exit before a straight is the most important segment. The speed of the exit determines the speed during and at the end of the straight. If you can increase the average speed of an entire straight, that will have greater impact that a faster average over the shorter distance of the entry to the turn, or through the turn itself.
The path, or "line" you drive through a corner will determine the exit speed. In general, the fastest line through a corner is the one that allows the greatest radius, or straightest path. As a car can go faster around a large corner than it can around a tight corner, the shortest path around a corner is rarely the fastest.
To illustrate these concepts so far, the classic teaching aid is to look at a 90-degree bend. In the illustration below, the dotted line follows the path of the road. The solid line indicates a path which maximizes the radius of the turn, or attempts to make the turn as straight as possible. As you can see there is significant difference in the tightness of the turn which follows the even the outside of the road compared to one the which utilizes the whole width of the road surface.
As mentioned, the objective in any corner is to have the highest exit speed. In addition to increasing the corner radius, this also involves taking a line which allows the earliest possible point of getting back into the throttle. To do this, the car must be straightening back out on the corner exit path as early as possible. We can modify the above corner line further to allow this.
The illustration below now shows the previously noted large radius path in the dotted line. The solid colored line shows a path known as the "late apex." This path moves forward the point at which the car reaches the corner apex. The late apex straightens out the exit path of the car, and therefore allows the driver to apply the accelerator earlier. This increases the exit speed, and in effect lengthens the straight which allows for higher speed at the end of the straight.
While the geometric racing line is faster than the natural line of the road, there is still a faster technique for most corners. The technique is called using a late apex. By delaying the turn-in point, and beginning the turn with a slightly sharper bend, the car can be aimed to apex later than the geometric apex point. This straightens out the second part of the turn, allowing the driver to apply the accelerator earlier. The car will have to slow down a little more at the turn in phase, but exit speed will be higher. That exit speed gives the driver that much more speed on the straight which will result in lower lap times overall.
This approach works for corners which require hard accelerating cornering out of them, which will be most of them. However, there are many types of corners, and combinations of corners which require some analysis to understand the best approach. Along the right are small figures of corner examples. Click each one to for a larger view and some instructional comments.
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This may help?.
#2185
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I got a question:
What is the technical term for when you are driving through a long bend that is bearing left... think long offramp. Going about 60mph. Small bump in the road. Car suddenly feels light and feels like it is gliding or hops right. Very very short. No dramatic correction needed ... no loss of control ... easily 'corrected' by letting off the throttle. Wheels arent juddering, or skidding, or anything...Almost feels like the car literally slid a tad on ice.
Pretty sure that isn't bumpsteer as A. the RX8's suspension doesn't really exhibit bump steer issues, and B. my steering wheel doesn't swing in any specific direction.
What is the technical term for when you are driving through a long bend that is bearing left... think long offramp. Going about 60mph. Small bump in the road. Car suddenly feels light and feels like it is gliding or hops right. Very very short. No dramatic correction needed ... no loss of control ... easily 'corrected' by letting off the throttle. Wheels arent juddering, or skidding, or anything...Almost feels like the car literally slid a tad on ice.
Pretty sure that isn't bumpsteer as A. the RX8's suspension doesn't really exhibit bump steer issues, and B. my steering wheel doesn't swing in any specific direction.
I think that is simply traction loss. The stiffer your suspension, the easier it happens on any sudden road surface elevation changes. Same problem when close to ABS threshhold when braking and there is a bump or fold in the road/
I've never seen a specific term for it.
#2186
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ok cool, wanted to make sure i wasn't missing something obvious as far as a term goes lol. Been seeing people refer to it as "squirreling" , "floating" , "jutting", etc.
But Yea i think it is not only caused by a stiff suspension, but also been reading that toe angles (I toe in the rear) can cause it too.
But Yea i think it is not only caused by a stiff suspension, but also been reading that toe angles (I toe in the rear) can cause it too.
#2187
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Definitely. When my left rear toe was knocked out by a pot hole hit, it became pretty scary severe. Zero toe is probably the calmest overall, though i would expect that exact toe can play with the actual bump/fold details, if it hits left vs right differently, etc...
#2194
Yank My Wankel
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#2196
Drive it like ya stole it
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I got a question:
What is the technical term for when you are driving through a long bend that is bearing left... think long offramp. Going about 60mph. Small bump in the road. Car suddenly feels light and feels like it is gliding or hops right. Very very short. No dramatic correction needed ... no loss of control ... easily 'corrected' by letting off the throttle. Wheels arent juddering, or skidding, or anything...Almost feels like the car literally slid a tad on ice.
Pretty sure that isn't bumpsteer as A. the RX8's suspension doesn't really exhibit bump steer issues, and B. my steering wheel doesn't swing in any specific direction.
What is the technical term for when you are driving through a long bend that is bearing left... think long offramp. Going about 60mph. Small bump in the road. Car suddenly feels light and feels like it is gliding or hops right. Very very short. No dramatic correction needed ... no loss of control ... easily 'corrected' by letting off the throttle. Wheels arent juddering, or skidding, or anything...Almost feels like the car literally slid a tad on ice.
Pretty sure that isn't bumpsteer as A. the RX8's suspension doesn't really exhibit bump steer issues, and B. my steering wheel doesn't swing in any specific direction.
Sounds like a really quick hydroplane.....without water. ....
#2198
I lowered my rx8 and inch and a half and was wandering what offset i could use on a set of 18 x 8.5 in the front and 18 x 9.5 in the rear? i don't want to roll the fenders or do any body work, i just want to know the best offset to go to allow me to do this/look the best.
#2200
You gonna eat that?
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