KAC1023 Posted October 14, 2010 Report Share Posted October 14, 2010 I just got my Silverado SS two months ago, did some small stuff, Bak Flip bed liner, Alpine radio, Blend Mount for my V1, tinted glass. Anyway, went to bring my dad to the Dr today (he has a 05 Duramax fully loaded). he asked how fast my truck goes because his with the Allison stops at 100mph, it runs out of motor, its fully rev'd. So I found a nice opening on the highway today and let er rip, got like 115-117 had my eyes on the road, saw the RPMs in the high 4k range. Are these trucks governed? If so, how high? And by me hitting this speed do you think I have a aftermarket program or PCM? I had a 94 Impala SS that was governed at 8mph, but using my Hypertech programmer I shut that off right away. Quote Link to comment Share on other sites More sharing options...
ThatTallCanadian Posted October 14, 2010 Report Share Posted October 14, 2010 8pmh?! That must have taken you forever to get anywhere! Quote Link to comment Share on other sites More sharing options...
joeyg Posted October 14, 2010 Report Share Posted October 14, 2010 8pmh?! That must have taken you forever to get anywhere! I don't know what they're governed at but I'm sure they are. The speed limiting usually relates to what the stock tires are speed rated for. Quote Link to comment Share on other sites More sharing options...
KAC1023 Posted October 14, 2010 Author Report Share Posted October 14, 2010 8mph , lol. That car was fun though, high speed lane all day, everyone would move thinking your a cop, the best was catching the people trying to "hide" putting their seat belts on. Quote Link to comment Share on other sites More sharing options...
CTSSS Posted October 14, 2010 Report Share Posted October 14, 2010 mine is governed at about 108, its pretty obnoxious i was on my way home from class last night and this guy in a corolla was riding my ass so i took off and so did he and he just kept his foot in it, when i hit governor he rolled right past me lol its just irritating to get passed by a corolla cuz youre truck wont go any faster Quote Link to comment Share on other sites More sharing options...
misterp Posted October 14, 2010 Report Share Posted October 14, 2010 ...speed limiting usually relates to what the stock tires are speed rated for. mine is governed at about 108... The factory limits the PCM in the AWD trucks to 108-mph; the 2WD trucks are limited to 98-mph. Yup your truck has a lot more, after installing my shift kit, Corsa Sport, and CAI I flew by a group of about 60 bikers north of Glen Rose TX, and the truck upshifted into 4th 2/3rds of the way through the passing and kept on going, that's somewhere north of 134-mph. Mr. P. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted October 14, 2010 Report Share Posted October 14, 2010 Got my SSS to 112mph in stock form, but she has been to 130mph on the dyno, and to about 120mph on the street. Quote Link to comment Share on other sites More sharing options...
yfz450_0569 Posted October 14, 2010 Report Share Posted October 14, 2010 I took my truck up to 133 the other day.. that's where it maxed out in 3rd and wouldn't take 4th. That is also with about 1/2 and inch to 1 inch smaller tires than factory. Quote Link to comment Share on other sites More sharing options...
malibutwins Posted October 14, 2010 Report Share Posted October 14, 2010 I have had mine up to 134 via my gps that was in 3rd Quote Link to comment Share on other sites More sharing options...
zachm89 Posted October 14, 2010 Report Share Posted October 14, 2010 ive had mine to right around 137 according to my gps and i ran out of road before it went into 4th...kinda scary to think how much it might have had left Quote Link to comment Share on other sites More sharing options...
catdaddy300 Posted October 14, 2010 Report Share Posted October 14, 2010 hit 138 passing a g5 or something from mazda i forgot what it was but even during the night i saw his eyes and he could not believe a full size truck was passing him, lol Quote Link to comment Share on other sites More sharing options...
CTSSS Posted October 14, 2010 Report Share Posted October 14, 2010 wow i really to get a tune......i wanna go 135 like you guys haha Quote Link to comment Share on other sites More sharing options...
bigreds10 Posted October 14, 2010 Report Share Posted October 14, 2010 (edited) wow i really to get a tune......i wanna go 135 like you guys haha mine goes im sure 130ish also. the speedo tops out at 120 but keeps on pulling, but my truck is lifted with 285/75R17 bfg at ko. it gets a lil sketchy at that speed but thats in 3rd it wont shift into 4th. im thinking of getting a speedometer that goes to 140mph and 7k tach Edited October 14, 2010 by chevy vmax (see edit history) Quote Link to comment Share on other sites More sharing options...
shadowsniper3006 Posted October 14, 2010 Report Share Posted October 14, 2010 we had Joes truck up to 149 on the dyno, using HPT logging, this was in third but the converter locked. I don't have the log in front of me but it was around 6600 rpm. At that MPH on a dyno loaded for wind drag...i don't think 4th gear would have done any good, third gear was barely pulling through. Quote Link to comment Share on other sites More sharing options...
bigreds10 Posted October 14, 2010 Report Share Posted October 14, 2010 we had Joes truck up to 149 on the dyno, using HPT logging, this was in third but the converter locked. I don't have the log in front of me but it was around 6600 rpm. At that MPH on a dyno loaded for wind drag...i don't think 4th gear would have done any good, third gear was barely pulling through. i still think a 6500lb truck going 120+mph is d**m fast for it. it shocks a lot of people how fast these trucks go. Quote Link to comment Share on other sites More sharing options...
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