Jacks GT Posted December 13, 2007 Share Posted December 13, 2007 Just out of curiosity does the cobb access port remove the top speed governor? I will be purchasing one of these soon and i was just wondering. i was doing some searching earlier and found out that stock the lgt comes with a speed governor at 139 what is the highest someone has reached in this car? im geussing it would top out without restrictions at about 160mph? Link to comment Share on other sites More sharing options...
sactojesse Posted December 13, 2007 Share Posted December 13, 2007 Just out of curiosity does the cobb access port remove the top speed governor? I will be purchasing one of these soon and i was just wondering. i was doing some searching earlier and found out that stock the lgt comes with a speed governor at 139 what is the highest someone has reached in this car? im geussing it would top out without restrictions at about 160mph? My understanding is that the speed governor is part of the stock map. The Cobb maps don't have a speed governor. When you remove the stock map and reflash it with a Cobb map, the speed governor is gone. Regarding the theoretical top speed without the map, I calculated 157 mph at the 6,500 rpm redline in 5th gear with 215/45R17 tires. If you run taller tires or have a Spec B six speed, theoretical top speed would be higher. These calculations for for the 5MT. The AT has different ratios. MPH = (rpm x tire diameter in inches)/(gear ratio x 336) = (6,500 x 24.62 in.)/([0.738 (5th gear) x 4.11 (ring and pinion)] x 336) = 157 mph Link to comment Share on other sites More sharing options...
hutru01 Posted December 13, 2007 Share Posted December 13, 2007 Yes, any map other than the stock map does not have a speed governor Link to comment Share on other sites More sharing options...
Jacks GT Posted December 13, 2007 Author Share Posted December 13, 2007 awsome thanks guys Link to comment Share on other sites More sharing options...
flyboy1649 Posted December 13, 2007 Share Posted December 13, 2007 Just out of curiosity does the cobb access port remove the top speed governor? I will be purchasing one of these soon and i was just wondering. i was doing some searching earlier and found out that stock the lgt comes with a speed governor at 139 what is the highest someone has reached in this car? im geussing it would top out without restrictions at about 160mph? Took my 08 LGT to 141 and had about 800-1000 left on the RPM....... Link to comment Share on other sites More sharing options...
Jacks GT Posted December 13, 2007 Author Share Posted December 13, 2007 did they change the governor on the 08? Link to comment Share on other sites More sharing options...
CTlegacy06 Posted December 13, 2007 Share Posted December 13, 2007 Took my 08 LGT to 141 and had about 800-1000 left on the RPM....... in a closed private track Fixored! Link to comment Share on other sites More sharing options...
sactojesse Posted December 13, 2007 Share Posted December 13, 2007 For sh!ts and giggles, I ran the theoretical top speed calcs on the much taller AT and Spec B 6MT top gears. For the AT: MPH = (rpm x tire diameter in inches)/(gear ratio x 336) = (6,500 x 24.62 in.)/([0.834 (5th gear) x 3.27 (ring and pinion)] x 336) = 175 mph (never going to pull that in 5th) For the 6MT Spec B: MPH = (rpm x tire diameter in inches)/(gear ratio x 336) = (6,500 x 25.62 in.)/([0.707 (6th gear) x 3.90 (ring and pinion)] x 336) = 180 mph (never going to pull that in 6th) Link to comment Share on other sites More sharing options...
Lothar Posted December 13, 2007 Share Posted December 13, 2007 Speed Governor: http://www.horroria.com/i/nposters/00/08/823-HZ.jpg Link to comment Share on other sites More sharing options...
Jacks GT Posted December 14, 2007 Author Share Posted December 14, 2007 For sh!ts and giggles, I ran the theoretical top speed calcs on the much taller AT and Spec B 6MT top gears. For the AT: MPH = (rpm x tire diameter in inches)/(gear ratio x 336) = (6,500 x 24.62 in.)/([0.834 (5th gear) x 3.27 (ring and pinion)] x 336) = 175 mph (never going to pull that in 5th) For the 6MT Spec B: MPH = (rpm x tire diameter in inches)/(gear ratio x 336) = (6,500 x 25.62 in.)/([0.707 (6th gear) x 3.90 (ring and pinion)] x 336) = 180 mph (never going to pull that in 6th) What about 5-speed Link to comment Share on other sites More sharing options...
sactojesse Posted December 14, 2007 Share Posted December 14, 2007 What about 5-speed I posted the calcs for 5MT LGT earlier: Regarding the theoretical top speed without the map, I calculated 157 mph at the 6,500 rpm redline in 5th gear with 215/45R17 tires. If you run taller tires or have a Spec B six speed, theoretical top speed would be higher. These calculations for for the 5MT. The AT has different ratios. MPH = (rpm x tire diameter in inches)/(gear ratio x 336) = (6,500 x 24.62 in.)/([0.738 (5th gear) x 4.11 (ring and pinion)] x 336) = 157 mph Link to comment Share on other sites More sharing options...
Jacks GT Posted December 14, 2007 Author Share Posted December 14, 2007 auto is quicker than mt? Link to comment Share on other sites More sharing options...
sactojesse Posted December 14, 2007 Share Posted December 14, 2007 auto is quicker than mt? Not necessarily. That's just theoretical top speed based on redline in top gear. The AT has taller gearing, but probably can't pull that theoretical top speed. Top speed is a function of many factors, including whether there is enough power to overcome aerodynamic drag at a given engine speed. A 5MT LGT is more likely to hit its theoretical top speed because of its lower gearing. Link to comment Share on other sites More sharing options...
sactojesse Posted December 14, 2007 Share Posted December 14, 2007 Here's the theoretical top speed calcs for a 2006 5MT Spec B: MPH = (rpm x tire diameter in inches)/(gear ratio x 336) = (6,500 x 25.62 in.)/([0.738 (5th gear) x 4.11 (ring and pinion)] x 336) = 163 mph The 5MT (2006) Spec B has numerically identical gearing to the 5MT LGT but rides on one inch larger diameter tires, so its effective/functional gearing is taller. Link to comment Share on other sites More sharing options...
Jacks GT Posted December 14, 2007 Author Share Posted December 14, 2007 ok thanx for that Link to comment Share on other sites More sharing options...
legacydispatcher Posted December 14, 2007 Share Posted December 14, 2007 Ok so what is the top speed in a 2.5i? Link to comment Share on other sites More sharing options...
CTlegacy06 Posted December 14, 2007 Share Posted December 14, 2007 Ok so what is the top speed in a 2.5i? Very slow. Link to comment Share on other sites More sharing options...
nm Posted December 14, 2007 Share Posted December 14, 2007 Ok so what is the top speed in a 2.5i? More than enough to get you arrested. Not enough to let you get away with it. /I knwo people who've cracked 120, but pretty much everything can do that today Link to comment Share on other sites More sharing options...
1-3-2-4 Posted December 14, 2007 Share Posted December 14, 2007 the 2.5i has a problem with 120?? I took this going 115 in a impreza 1.8L it was all flat level land and that was the highest I've seen but I mean the 2.5i should have no issue.. http://img181.imageshack.us/img181/1007/43fba483cd82sx2.jpg Link to comment Share on other sites More sharing options...
CTlegacy06 Posted December 14, 2007 Share Posted December 14, 2007 ibtl /End Thread Link to comment Share on other sites More sharing options...
1-3-2-4 Posted December 14, 2007 Share Posted December 14, 2007 ibtl /End Thread http://legacygt.com/forums/showthread.php?t=76923 Link to comment Share on other sites More sharing options...
nm Posted December 14, 2007 Share Posted December 14, 2007 the 2.5i has a problem with 120?? I took this going 115 in a impreza 1.8L it was all flat level land and that was the highest I've seen but I mean the 2.5i should have no issue.. Heck, I don't know. I was just told it'll do 120 by someone who owns one. Link to comment Share on other sites More sharing options...
sactojesse Posted December 14, 2007 Share Posted December 14, 2007 I'm guessing a 2.5i could probably pull 120-130 max. I recall seeing an old road test of a previous generation normally aspirated 2.5l Legacy GT and the top speed was in the 120-130 range without a speed limiter. Link to comment Share on other sites More sharing options...
whitetiger Posted December 14, 2007 Share Posted December 14, 2007 my friend with a 2002 LGT 5mt got 120 on "the track." The speedo in that car ends at 120. Ive personally have gotten the speedo needle on a 2002 LGT 5mt to point down in to the odometer on a downhill section of "track". Link to comment Share on other sites More sharing options...
Googalash Posted December 15, 2007 Share Posted December 15, 2007 I'm guessing a 2.5i could probably pull 120-130 max. I recall seeing an old road test of a previous generation normally aspirated 2.5l Legacy GT and the top speed was in the 120-130 range without a speed limiter. I'd say it could do more than that. I was able to top my 99 LGT out at 137mph one time. So I would think a 2.5I should be able to get up to that. Link to comment Share on other sites More sharing options...
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