ZR8ED Posted August 8, 2005 Share Posted August 8, 2005 As some have probably read from my other posts, that my 3" exhaust is on and working well. Exhaust smell is dramatically reduced. One quick question. since the exhaust change, my rpm's are now lower on the highway compared to before. ie 3000rpm came at 120kph. add the new exhaust, and 3000rpm now gets me 130kph (approx) and 2700rpm gets me 120kph. How is this possible? Scott. Quote Link to comment Share on other sites More sharing options...
Oleh Posted August 8, 2005 Share Posted August 8, 2005 ^ same thing happend to me, on a different car though... I think the engine has less backpressure thus its easier to push the gasses out. Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted August 8, 2005 Share Posted August 8, 2005 The new exhaust is lighter, so less load on the rear wheels, the car compresses them less, larger effective diameter thus higher speed for the same engine revs. Actually I don't know. If you have an automatic transmission then there could be something with less torque converter slip. Other than that it just may be the accuracy of the tach and/or speedo has changed. If it is an electronic speedo, maybe the sensor was disconnected and reconnected so there is a better and/or lesser quality signal? Or maybe your eyes are just in better focus due to the lower carbon monoxide levels. Quote Link to comment Share on other sites More sharing options...
Nigel Posted August 8, 2005 Share Posted August 8, 2005 Hey Scott! That can't be possible with a manual transmission. The engine is mechanically linked to the wheels, so there's no way. In an automatic, I could see it happening because of the torque converter. Either something else has changed, or you're not remembering the RPM's properly. Use this transmission calculator to find out what the correct speed to rpm should be... http://www.geocities.com/z_design_studio/ Cheers! Nigel Quote Link to comment Share on other sites More sharing options...
johnc Posted August 8, 2005 Share Posted August 8, 2005 The 3" exhaust has reduced backpressure to the point that a low pressure area exists in the tubing causing the high pressure air in the tires to be pulled to the inside. This increases the inside OD of the tire which, with the negative camber that you're running, correlates to a reduction in operating rpm of 300. If you decrease the negative camber by .23 degrees you'll get back that 300 rpm. Quote Link to comment Share on other sites More sharing options...
CybrStuff Posted August 8, 2005 Share Posted August 8, 2005 The 3" exhaust has reduced backpressure to the point that a low pressure area exists in the tubing causing the high pressure air in the tires to be pulled to the inside. This increases the inside OD of the tire which, with the negative camber that you're running, correlates to a reduction in operating rpm of 300. If you decrease the negative camber by .23 degrees you'll get back that 300 rpm. You can't be serious, right? Quote Link to comment Share on other sites More sharing options...
wpnmkr Posted August 8, 2005 Share Posted August 8, 2005 The 3" exhaust has reduced backpressure to the point that a low pressure area exists in the tubing causing the high pressure air in the tires to be pulled to the inside. This increases the inside OD of the tire which, with the negative camber that you're running, correlates to a reduction in operating rpm of 300. If you decrease the negative camber by .23 degrees you'll get back that 300 rpm. Good stuff! That boggled my mind faster than a Grumpyvette post! Quote Link to comment Share on other sites More sharing options...
johnc Posted August 9, 2005 Share Posted August 9, 2005 You can't be serious, right? Absolutely. With the low pressure in the exhaust the Dp-brane superstring as part of the relativistic paradox inside the tire carcass is vectored toward the inner spacial area. Under this condition, the endpoints of strings are free to move about but no momentum can flow into or out of the end of a string. The T duality infers the existence of open strings with positions fixed in the dimensions that are T-transformed. Generally, in type II theories, we can imagine open strings with specific positions for the end-points in some of the dimensions. This lends an inference that they must end on a preferred surface. Superficially, this notion seems to break the relativistic invariance of the theory, possibly leading to a paradox. The resolution of this paradox is that strings end on a p-dimensional dynamic object, the Dp-brane. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted August 9, 2005 Share Posted August 9, 2005 ^^^^^^^^^ Wow! LOL:icon52: Guy Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted August 9, 2005 Share Posted August 9, 2005 Absolutely. With the low pressure in the exhaust the Dp-brane superstring as part of the relativistic paradox inside the tire carcass is vectored toward the inner spacial area. Under this condition' date=' the endpoints of strings are free to move about but no momentum can flow into or out of the end of a string. The T duality infers the existence of open strings with positions fixed in the dimensions that are T-transformed. Generally, in type II theories, we can imagine open strings with specific positions for the end-points in some of the dimensions. This lends an inference that they must end on a preferred surface. Superficially, this notion seems to break the relativistic invariance of the theory, possibly leading to a paradox. The resolution of this paradox is that strings end on a p-dimensional dynamic object, the Dp-brane.[/quote'] Quote Link to comment Share on other sites More sharing options...
katman Posted August 9, 2005 Share Posted August 9, 2005 Give that man a bucket of propwash and some brushes for his vortex generators- he's hit the nail on the head, aerodynamically speaking. Quote Link to comment Share on other sites More sharing options...
CruxGNZ Posted August 9, 2005 Share Posted August 9, 2005 *snap* ah, damnit, by mrain.... I think Johns been sippin' back on grandpa's cough syrup. That has to be one of the funniest things I have ever read on here !M! Quote Link to comment Share on other sites More sharing options...
patzky1 Posted August 9, 2005 Share Posted August 9, 2005 Hmmm, Modified string theory employed to describe an easily diagnosed problem. I'LL BUY IT! Actually, there is no RPM change and you are bull$#!%%ing us. Right, ZR8ED? Otherwise, you def. changed something else other than just the exhaust if the rpm's changed and you have a manual tranny with a good clutch. What you suggest is unpossible IMHO... Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted August 9, 2005 Share Posted August 9, 2005 Didn't someone else just complain about this in a recent thread? I think he had changed spark plugs though. Or maybe it was Aux linking to some goofball thread on another board. Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted August 9, 2005 Share Posted August 9, 2005 Oh yeah, here it is http://forums.hybridz.org/showthread.php?t=102668&highlight=%22RPM%22+%22plugs%22 PS: none of my comments in the aforementioned link pertain to anyone on this thread. Quote Link to comment Share on other sites More sharing options...
CybrStuff Posted August 9, 2005 Share Posted August 9, 2005 Absolutely. With the low pressure in the exhaust the Dp-brane superstring as part of the relativistic paradox inside the tire carcass is vectored toward the inner spacial area. Under this condition' date=' the endpoints of strings are free to move about but no momentum can flow into or out of the end of a string. The T duality infers the existence of open strings with positions fixed in the dimensions that are T-transformed. Generally, in type II theories, we can imagine open strings with specific positions for the end-points in some of the dimensions. This lends an inference that they must end on a preferred surface. Superficially, this notion seems to break the relativistic invariance of the theory, possibly leading to a paradox. The resolution of this paradox is that strings end on a p-dimensional dynamic object, the Dp-brane.[/quote'] Ahh, now I get it. By transmogrifying the nth-dimensional temporal Wronskian, he's managed to vectorize the scalar equilibria. Tricky, but he should be careful: if the flux capacitor generates the wrong multiphasic interference pattern, he could rip open a hole in the space-time continuum, releasing enough anti-leptons to effectively annhiliate our entire universe (and possibly a few parallel ones). Quote Link to comment Share on other sites More sharing options...
Afshin Posted August 9, 2005 Share Posted August 9, 2005 ROFL I just broke out in a laugh while I was pretending to work, you guys are killing me here. Quote Link to comment Share on other sites More sharing options...
TheNeedForZ Posted August 9, 2005 Share Posted August 9, 2005 So, what you guys are saying is that I am actually my own grandpa? This is why I love this forum. Somebody should make this a sticky. Quote Link to comment Share on other sites More sharing options...
ZR8ED Posted August 9, 2005 Author Share Posted August 9, 2005 to the song of "I can see clearly now the rain is gone" I can see clearly now that the exhaust is gone.. I agree with Pop n Wood. I can think better in the car as well.. I am getting better gas mileage (less throttle to maintain the same speed as before) , and no fumes in the car, except when I shift and the blow off valve lets out metered air, and the car goes rich for a second. hehehe John C. That is some funny "Sheeeeit" Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted August 9, 2005 Share Posted August 9, 2005 JOHNC the first time I read that, "The 3" exhaust has reduced backpressure to the point that a low pressure area exists in the tubing causing the high pressure air in the tires to be pulled to the inside. This increases the inside OD of the tire which, with the negative camber that you're running, correlates to a reduction in operating rpm of 300. If you decrease the negative camber by .23 degrees you'll get back that 300 rpm." I was amused and wondered if anyone would take your post seriously, for an instant! then I re-read it and was SURE no one would for even an instant, but I could see the humor, potentially ... then I read this........."Good stuff! That boggled my mind faster than a Grumpyvette post!" by wpnmkr and I don,t know what to think???? Quote Link to comment Share on other sites More sharing options...
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