5.3 cam only - need advice
Thread Starter
Teching In
Joined: Jul 2015
Posts: 46
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i appreciate it Thunderstruck. It was street tuned (tweaked from the dyno tune) while driving very moderately. From a 25-30mph+ roll, throttle is great. I am taking it back up to have him check out bottom end tuning. Might go MAF. Not sure the thought behind no MAF other than I was told it is more important on boost vs N/A tuning.
Just because I can light a pile of money on fire in my front yard each day driving a 3-speed... doesn't make it a smart decision. But yeah , of course you can do it! do whatever you want...
Yep, You confirmed it....You're still an idiot! The transmission alone has little to do with it. It doesn't matter if it's two speed three speed or 13 speed... final drive ratio is all that matters.
I could run something direct drive and the final drive ratio would determine if it's suitable for highway speeds or not. You can run a powerglide with 2.90 gear and a tall tire and cruise the highway just fine or you can run an overdrive trans with 3.91 gears and low profile tires and have a similar final drive ratio. You night want to quit posting before you make a complete fool of yourself..... Not that you haven't already.
I could run something direct drive and the final drive ratio would determine if it's suitable for highway speeds or not. You can run a powerglide with 2.90 gear and a tall tire and cruise the highway just fine or you can run an overdrive trans with 3.91 gears and low profile tires and have a similar final drive ratio. You night want to quit posting before you make a complete fool of yourself..... Not that you haven't already.
Yes, I have experience with this. Went from a stock converter to a 10" 3800stall TCI in my 1983 Camaro behind a 355 N/A and 2.73 rear gear, and it got dog slower, night and day. The converter wasn't able to do... whatever it is they do when the gear is right. I'm not a converter expert but I am sure you can ask one why it happened, the trick is gearing needs to match. plain and simple.
If the vehicle is used for racing purposes only you dial the rear gear to max MPH and RPM for the intended application (1/8, 1/4, 1/2, 1, 2 miles racing). You can't just throw random stats for 1/4 mile cars only and say its a "shame" or whatever.
Street cars.... the rules change. If you truly favor economy, you have way more work to do than just choosing the best gear for max MPH/RPM in final racing gear. You need to actually test the car, drive it at different speeds and find the best(low) injector duty cycle, with the highest vacuum signal, the best EGT and so forth. There is alot of calculation involved. The weight and rolling resistance of the vehicle determines how much gear you can sneak out from under it (to reduce engine RPM) without ruining its performance in the (1/8 1/4 1/2 etc) whatever the application is when its not just driving around economically.
And a huge waste that is, something I do not support or advise, but I am poor so that is probably why. In my mind nobody is that wasteful; thus they do not exist as examples (they are poor role models for your own vehicle if you intend to achieve economy value points) try not to learn from poor examples, it leads to terrible ideas being fostered by the masses. or something.
A 3-speed car with 3.73s hitting 6,000rpm in the 1/4 is a shame? That's 132mph with a 28" tire. Good thing LS motors go to 7,000 or more, because that's 155mph. With the same tire, RPM at 60mph is about 2700rpm. Not too far off what I get with 4.30 gears in 4th in my 4L80e.
Street cars.... the rules change. If you truly favor economy, you have way more work to do than just choosing the best gear for max MPH/RPM in final racing gear. You need to actually test the car, drive it at different speeds and find the best(low) injector duty cycle, with the highest vacuum signal, the best EGT and so forth. There is alot of calculation involved. The weight and rolling resistance of the vehicle determines how much gear you can sneak out from under it (to reduce engine RPM) without ruining its performance in the (1/8 1/4 1/2 etc) whatever the application is when its not just driving around economically.
No one drives a 3-speed cross country? Yes they do, every day. Nobody will drive it 1000 miles with 15mpg? Millions of people do this. Millions.
Thread Starter
Teching In
Joined: Jul 2015
Posts: 46
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Have none of you been on a powertour? Shitloads of 3speed autos. Cruising long distances.
4speed autos will fit in my car, but the 6 speed, 8 sleed etc, not even close. If you want an economy car, go get a prius or a volt.
My car is a street car, with a th400. With the 3.08s I can get 18mpg if I want, which is as good as I did in a 2010 Camaro with a 6 speed.
But I'm glad the thread got taken over to fight about mpg. Didnt realize this was the prius forum.
4speed autos will fit in my car, but the 6 speed, 8 sleed etc, not even close. If you want an economy car, go get a prius or a volt.
My car is a street car, with a th400. With the 3.08s I can get 18mpg if I want, which is as good as I did in a 2010 Camaro with a 6 speed.
But I'm glad the thread got taken over to fight about mpg. Didnt realize this was the prius forum.
The trans is everything. I'd rather have a 8-speed than a 3-speed. Why do you think the auto manufacturers are moving toward more gears? Lol they are all idiots right? Silly them, they should just change the rear gear ratio! Think of all the money they would save! Quick, call them and tell them they are idiots for adding more gears!
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This is a summary of gears, it outlines everything I could think of that might be important to have a viewpoint on transmissions in 2016 in general for all vehicles, whether performance or economy biased, or both. The fuel economy aspect of tuning is considered "advanced", injector phasing and lean air fuel ratios with considerable timing tuning (via logs with EGT and injector duty while using cruise control) keeps the combustion chamber and plug cleaner (less carbon byproduct) and help the engine produce less wasted energy in temp rise (the engine can stay cooler) and of course the better fuel use per time (gallons per hour or miles per gallon etc..) are all benefits to economy tuning (its not just for Priuses. It is for every engine that you care about).
Teching In
Joined: Nov 2015
Posts: 15
Likes: 1
Yeah, years ago. You don't see the 3-speeds anymore though, probably since 1984 I guess? Since then, its 4 speeds, 5 speeds, heck 7 or 8 speeds. The 3-speed is long gone. You don't jump in one of those cars and drive it across country; you can't expect to do much more than drive around your city with one.
Thus, dedicated track(city) car. Nobody will drive it 1000 miles with 15mpg; that is my cut off.
Thus, dedicated track(city) car. Nobody will drive it 1000 miles with 15mpg; that is my cut off.
Teching In
Joined: Nov 2015
Posts: 15
Likes: 1
original poster. you ever read this article ?
http://www.hotrod.com/articles/ls-cam-test-comparison/
kinda goes into detail about what your experiencing.
http://www.hotrod.com/articles/ls-cam-test-comparison/
kinda goes into detail about what your experiencing.
I meant, they don't put them into actual cars you buy new anymore. Not that you couldn't find them lol. I know you can throw a rock and hit a 3-speed.
rofl like I would be ok with doing this without caffeine and so forth
rofl like I would be ok with doing this without caffeine and so forth
Teching In
Joined: Feb 2015
Posts: 31
Likes: 0
Less gears does not necessitate a faster vehicle. The problem is your think is eco minded. Most of the 3 speed people are all about most efficient power for the least cost. Your correct in thinking that fuel economy is affected by the additional gearing. Generally have overdrive will lower the rpm into a more efficient area but it has to do with the rear end ratio as well. How about your 8 speed with 5.13 gears vs the 3 speed with 2.29 ratio?
What transmission eats up more power via frictional losses or just amount of extra weight? A 2 speed power glide or the 8 speed in your odd diagram.
What transmission eats up more power via frictional losses or just amount of extra weight? A 2 speed power glide or the 8 speed in your odd diagram.
