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Old 10-31-2013, 02:18 PM   #18
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9mpg how big of a cam. i can't get that low without the wheels spinning.
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Old 10-31-2013, 03:06 PM   #19
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You get 20.9mpg/city?? Wow, puts my 9mpg/city to shame! And I baby the shit out of my car!
I can relate.
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9mpg how big of a cam. i can't get that low without the wheels spinning.
Mine is the JRE rough idle cam included in the 480RWHP package. I tend to drive a lot harder than I did prior to the cam, and that really sucks down the fuel.
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Old 10-31-2013, 05:25 PM   #20
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It depends on where and how you drive your car. If you drive around town you will get better fuel economy. On the interstate you will see a slight decrease. On average it is probably a wash. At worst you might see a 2-3MPG reduction.

Yup... this is what I seen reduced in my mpg on highway. I "was" getting 25 to 27 mpg and now 21 to 23. (cruise control on)

When I mega performance modded my motor 2 years ago, my hwy mpg increased which I feel due getting greater efficiency of the increased power/torq

In town, I forget to reset/ clear and then look, but the improved fun of the 3:91's city mpg doesn't matter to me
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Old 10-31-2013, 06:24 PM   #21
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I agree with it all..... I got the 3.73 cause I have an auto... was totally different a lot more fun to drive... killed my gas but who cares.....
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Old 10-31-2013, 06:36 PM   #22
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You get 20.9mpg/city?? Wow, puts my 9mpg/city to shame! And I baby the shit out of my car!
holy crap! 9MPG? what do you have in that car!? lol i put down 420rwhp and i get 20.9 lol actually since i had the car back its at 20.6. 2 months being in the shop does that lol
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Old 10-31-2013, 11:08 PM   #23
376LS3
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holy crap! 9MPG? what do you have in that car!? lol i put down 420rwhp and i get 20.9 lol actually since i had the car back its at 20.6. 2 months being in the shop does that lol
I have the Night Fury (Supposedly) and all my driving is city. My Camaro is not a daily so it doesnt bother me. I typically only drive it about 2 or 3 times a month. On the highway I get about 22mpg. The overlap of the cam is what kills the mpg. Im in process of getting things ready for my semi-bullet proof diff build. I have the extra diff, 3.91 w/install kit, and 1 piece driveshaft. Just need to order the TruTrac and billet caps and find someone capable of doing the build without having to ship it out to be done.
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Old 10-31-2013, 11:23 PM   #24
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1/4 mile difference??
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Old 10-31-2013, 11:26 PM   #25
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I would assume a pretty good difference if you can get the car off the line. With torque multiplication, you're more susceptible to wheel spin. But in theory the engine revs faster, which gains speed faster. Only downside is you are guaranteed to hit 4th gear before the stripe. Would prolly lose MPH because of that.
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Old 11-01-2013, 09:02 AM   #26
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I would assume a pretty good difference if you can get the car off the line. With torque multiplication, you're more susceptible to wheel spin. But in theory the engine revs faster, which gains speed faster. Only downside is you are guaranteed to hit 4th gear before the stripe. Would prolly lose MPH because of that.
In my opinion, a streetable stick shift car should go through the traps towards the top of 4th...if you shift fast enough, you wont lose any MPH, and if you have the tuner set you up for no lift shifting when they fix your speedo, you'll gain MPH.
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Old 11-01-2013, 10:13 AM   #27
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you can tune a ss for no lift shifting?
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Old 11-01-2013, 04:24 PM   #28
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Originally Posted by 376LS3 View Post
I would assume a pretty good difference if you can get the car off the line. With torque multiplication, you're more susceptible to wheel spin. But in theory the engine revs faster, which gains speed faster. Only downside is you are guaranteed to hit 4th gear before the stripe. Would prolly lose MPH because of that.

Very True! My last dyno pull I hit 633 which I can spin the crap out of the tires. (I have 315's) And yes, my cammed/blown motor rev's VERY fast. I have hit limiter in both 1st and 2nd gear...a lot

As I message, a DSS Carbon 1 piece getting made (about 2 weeks til ship) and looking to see if I gain any on the dyno. My main reason is a M6 is harder on drive train when dumping the clutch, also some what sloppy/clunky. DSS stated CF shaft with the flex great improvement for M6. Plus weight advantage they said will allow a faster engine rev! Ha...got that already
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Old 11-04-2013, 08:56 AM   #29
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you can tune a ss for no lift shifting?
You can tune any E38 or E67 controlled stick shift GM car for it...it's just how the rev limiter settings are configured.

My car has a 7400 RPM rev limiter in gear, and uses spark for the limit. When my foot hits the clutch pedal, the rev limiter cuts RPM down to 6000...by the time I complete a shift, the tach hasn't come all the way down to 6000 yet, but it's on it's way there, and the throttle plate is still wide open...as soon as I come off the clutch, obviously the tach comes down even lower, but spark also comes back and the engine is allowed to rev. I shift as close to 7000-7100 as I can, which means I actually drop to 4900 when I shift as our gears are spaced a little wide...I didn't want to drop the limiter all the way to 4900 on the clutch for a few reasons...it doesn't sound cool (even 6K doesn't compared to 7400 lol), I wanted to make sure the engine reacts as fast as possible to getting correct spark advance back as I complete the shift...higher RPM means better air/fuel flow through the chambers, and the power really does return instantly, AND, if the engine is still a little faster than the input shaft when the clutch engages, it makes the car accelerate a little bit harder right after a shift...if it was at 7400 RPM and yanking down to 4900, I'd be worried about breaking something (my clutch won't slip), but if it's actuallly heading down towards 6K...things work out nicely.
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Old 11-04-2013, 02:10 PM   #30
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thanks. now i understand no lift shifting. its for racing not for just driving around. its not rpm matching so your car is in the right rpm for whatever gear your shifting into.
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Old 11-04-2013, 04:07 PM   #31
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thanks. now i understand no lift shifting. its for racing not for just driving around. its not rpm matching so your car is in the right rpm for whatever gear your shifting into.
No, the new Corvette can do that, but they use a different computer with the new LT1. You're right, this would just be for racing, and only useful when upshifting.
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Old 11-04-2013, 11:49 PM   #32
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still will be something ill ask for when i add my headers and cam. Thanks
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Old 11-05-2013, 01:37 AM   #33
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1/4 mile difference??
1/4 mile is almost identical. It's a quicker first 1/8th but a slower than stock second 1/8. Stock you're through the 1/4 in 3rd. 3.91 you add a shift and finish in 4th.
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Old 11-05-2013, 05:32 PM   #34
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Hi guys,

I am very interested, installing 3.91 gears in my camaro. in my locality, replacing the gears is more difficult. a question, change the 3:27 gears for my L99 Camaro 1LE 3.91 gears, will greatly improve 1/4 and 1/8 mile?? 60ft improve?? to actually drag the sling is beneficial??
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