LS4hundy Posted March 27, 2007 Share Posted March 27, 2007 So I recently put on some 20 inch wheels and I just got back from the coast(400mile round trip) and I had no power on the highway. It feels like my car went from the big strong athletic kid to the fat one that walks around the track in P.E. Things I know: All fluids are good, just put a K&N air filter(anybody else have a hard time fitting the cover over the K&N air filter)in. Im waiting to put around 1000 miles on the tires to see how they are wearing so maybe I dont need to pay for a wheel allignment. I know I need to balance the wheels cause the steering wheel was a bit shaky at around 65 mph. Things I dont know. If I do get an allignment, will I need to get another when I put the stocks back on for the winter/fall? Does the balance or allignment affect the acceleration? I lost about 30-40 mpg on this trip. I usually squeeze about 500 miles out of one tank in highway driving and I usually use fuel cleaner(berrymans, I think its called) Granted there are alot of hills and curves on 101. Other than that, enjoy the pics and comments positve or negative are great. I know many of you guys are not into big rims. Enjoy the pics!! Quote Link to comment Share on other sites More sharing options...
falciott Posted March 27, 2007 Share Posted March 27, 2007 So I recently put on some 20 inch wheels and I just got back from the coast(400mile round trip) and I had no power on the highway. It feels like my car went from the big strong athletic kid to the fat one that walks around the track in P.E. Things I know: All fluids are good, just put a K&N air filter(anybody else have a hard time fitting the cover over the K&N air filter)in. Im waiting to put around 1000 miles on the tires to see how they are wearing so maybe I dont need to pay for a wheel allignment. I know I need to balance the wheels cause the steering wheel was a bit shaky at around 65 mph. Things I dont know. If I do get an allignment, will I need to get another when I put the stocks back on for the winter/fall? Does the balance or allignment affect the acceleration? I lost about 30-40 mpg on this trip. I usually squeeze about 500 miles out of one tank in highway driving and I usually use fuel cleaner(berrymans, I think its called) Granted there are alot of hills and curves on 101. Other than that, enjoy the pics and comments positve or negative are great. I know many of you guys are not into big rims. Enjoy the pics!! If you do notice a difference, then i'm assuming those are not forged wheels. If they're not forged wheels then jumping from 16" to 20" , thats a huge jump.. you're adding alot of unsprung weight to your car, that also increases the rotational inertia. The side effects of increased rotational inertia?! Well the acceleration decreases, braking distance increases, gas mileage suffers and steering responsiveness goes out the window. Nice wheels by the way. Quote Link to comment Share on other sites More sharing options...
W201 sweden Posted March 27, 2007 Share Posted March 27, 2007 I fully agree. A couple of more points, though. - How wide are your tires? Wider=more drag. - How TALL are your complete wheels? Bigger total diameter means lower wheel rpm for a given actual speed. This causes your odometer to display too little => less odo miles per tank. It also reduces displayed speed vs real speed => you drive faster than you think, and get less mpg. It will also give the impression of slower acceleration, beacause of this. - Do you inflate tires to the right pressure? These really low sidewalls need a surprisingly high pressure to operate correctly. Yes - riding comfort goes out the window, but that you knew would happen... :whistles: :) /Alexander, who is not really into that kind of modifications. ;) Quote Link to comment Share on other sites More sharing options...
LS4hundy Posted March 27, 2007 Author Share Posted March 27, 2007 Ill double check the air pressure but Im pretty sure there good. Wow, I learned alot from the last 2 posts, thanks a buck. Luckily Im back in school in a smaller town so Im not on the highway that much but I atleast get to roll in style in the warmer months around town. Everybody here is rather rich and retired or a hippy(ashland oregon)!! So many subaru wagons and trucks, not many big sedans on 20's. Thanks again for the comments. Quote Link to comment Share on other sites More sharing options...
rwallican Posted March 28, 2007 Share Posted March 28, 2007 I've got 20's too and haven't noticed a difference in performance. Nice wheels. I've got 245/35/20 on mine all the way around. Quote Link to comment Share on other sites More sharing options...
oohryry Posted March 28, 2007 Share Posted March 28, 2007 If you ever get tired of driving on tank wheels, pass them on to me. I'd love to drive a tank. Those are beauties. And what are forged wheels falciott? I need to know. Thanks. Quote Link to comment Share on other sites More sharing options...
LScott400 Posted March 28, 2007 Share Posted March 28, 2007 If you ever get tired of driving on tank wheels, pass them on to me. I'd love to drive a tank. Those are beauties. And what are forged wheels falciott? I need to know. Thanks. This looks like forgery to me..... Quote Link to comment Share on other sites More sharing options...
rwallican Posted March 29, 2007 Share Posted March 29, 2007 That's definitely forgery!! Quote Link to comment Share on other sites More sharing options...
LS4hundy Posted March 29, 2007 Author Share Posted March 29, 2007 So I recently put on some 20 inch wheels and I just got back from the coast(400mile round trip) and I had no power on the highway. It feels like my car went from the big strong athletic kid to the fat one that walks around the track in P.E. Things I know: All fluids are good, just put a K&N air filter(anybody else have a hard time fitting the cover over the K&N air filter)in. Im waiting to put around 1000 miles on the tires to see how they are wearing so maybe I dont need to pay for a wheel allignment. I know I need to balance the wheels cause the steering wheel was a bit shaky at around 65 mph. Things I dont know. If I do get an allignment, will I need to get another when I put the stocks back on for the winter/fall? Does the balance or allignment affect the acceleration? I lost about 30-40 mpg on this trip. I usually squeeze about 500 miles out of one tank in highway driving and I usually use fuel cleaner(berrymans, I think its called) Granted there are alot of hills and curves on 101. Other than that, enjoy the pics and comments positve or negative are great. I know many of you guys are not into big rims. Enjoy the pics!! If you do notice a difference, then i'm assuming those are not forged wheels. If they're not forged wheels then jumping from 16" to 20" , thats a huge jump.. you're adding alot of unsprung weight to your car, that also increases the rotational inertia. The side effects of increased rotational inertia?! Well the acceleration decreases, braking distance increases, gas mileage suffers and steering responsiveness goes out the window. Nice wheels by the way. Def not forged wheels...I have the original reciept. I was actually very lucky in dealing with Ebay. I got them of a guy who doesnt sell rims and just happen to be selling these becasue he traded in his ls430 and no longer needed them. Quote Link to comment Share on other sites More sharing options...
stylz Posted October 31, 2008 Share Posted October 31, 2008 what's the difference between forged? does it affect the ride? just got into a 93 ls 400 and need rims and tires. everyone is pushing me for 20s but i think its to big of a jump. Quote Link to comment Share on other sites More sharing options...
jcrome04 Posted October 31, 2008 Share Posted October 31, 2008 Nice wheels. Now you just need some Tanabe DF210's to compliment the rest of the car :D You ever make it up to the Sequim/Port Angeles area??? Quote Link to comment Share on other sites More sharing options...
LEXUSA Posted October 31, 2008 Share Posted October 31, 2008 How much heavier are the 20's vs. your stockers ? Heavier wheels have the greatest negative effect on performance than adding weight anywhere else, unsprung and rotational. Brakes are also unsprung but don't rotate. Quote Link to comment Share on other sites More sharing options...
landar Posted November 2, 2008 Share Posted November 2, 2008 I fully agree.A couple of more points, though. - How wide are your tires? Wider=more drag. - How TALL are your complete wheels? Bigger total diameter means lower wheel rpm for a given actual speed. This causes your odometer to display too little => less odo miles per tank. It also reduces displayed speed vs real speed => you drive faster than you think, and get less mpg. It will also give the impression of slower acceleration, beacause of this. - Do you inflate tires to the right pressure? These really low sidewalls need a surprisingly high pressure to operate correctly. Yes - riding comfort goes out the window, but that you knew would happen... :whistles: :) /Alexander, who is not really into that kind of modifications. ;) Yeah hundy, I think sweden hit the nail on the head...by going to 20's you essentially changed your rearend gearing. Makes the acceleration stink(its not an impression, its real) and throws your speedo off (reads lower speed than actual). So, lets say you going 50 mph but your speedo says 45 mph. Your gas economy would appear to suffer but that is really not the case. Just the computer being fooled by the lower registered speed. Its pretty simple really. You mess with the original design and strange things begin to happen. There is a price to pay for cool. B) Quote Link to comment Share on other sites More sharing options...
jcrome04 Posted November 4, 2008 Share Posted November 4, 2008 Not unless their overall diameter is the same... then it's just a weight issue. Quote Link to comment Share on other sites More sharing options...
MR. LEX Posted December 7, 2008 Share Posted December 7, 2008 20's will make your car slower just because of the weight and size of the rims. So you want big rims and the same speed you had before. You need more horse power and TQ. I would do some minor exhaust work and an Air intake system. An LS400 won't get very loud form these things being done. Unless you put a large exhaust system on your car. I would increase size by .25 or 1/4' inch. It helps out a great deal and cut the resonators off. Add Hi Flow cats to. Hope this helps you out. I know it worked for me. Quote Link to comment Share on other sites More sharing options...
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