5,500 shift WFT

bigike

bigike

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Why in GODS name does the viper engine shift at 5,500 +/- and my little ole 6.1 shifts a 6,200. I'm asking because i just got blown away by my wife in a flippin station wagon. Testosterone level is dropping sharply!

thanks
Jay
 
bigike said:
Why in GODS name does the viper engine shift at 5,500 +/- and my little ole 6.1 shifts a 6,200. I'm asking because i just got blown away by my wife in a flippin station wagon. Testosterone level is dropping sharply!

thanks
Jay
Click to expand...
Women are just better drivers :p :p :p :rock: :rock:

Bwahahahahhahaa :D
 
Well we have hashed this issue over in other threads but it is always fun...while you are referring to an automatic transmission...the concept is the same...in my opinion, which is contrary to the opinion of some...the ideal shift point is not at maximum RPM in each gear, it should be at the highest hp output level...which may or may not be at maximum rpm. In most of our trucks, that is at about 5500 rpm, while the engine will continue to rev to higher levels, the production of hp drops off as seen in dyno testing. See the dyno sheet below...it illustrates the point pretty well.

So it may just be that your wife really is faster than you...sorry to be the bearer of bad news.

IMG_0262.jpg
 
The GEN IV will shift higher due to the new internals. I saw it somewhere and do not recall the exact RPM but it was over 6K.

If you have a QC get a stage II PCM, it will increase the shift point.
 
bigike said:
Why in GODS name does the viper engine shift at 5,500 +/- and my little ole 6.1 shifts a 6,200. I'm asking because i just got blown away by my wife in a flippin station wagon. Testosterone level is dropping sharply!

thanks
Jay
Click to expand...
What was she drivin Ike?:confused:
 
Prof said:
In most of our trucks, that is at about 5500 rpm, while the engine will continue to rev to higher levels, the production of hp drops off as seen in dyno testing. See the dyno sheet below...it illustrates the point pretty well.
Click to expand...
What A/F ratio did sean tune you to with the SC?
 
I agree about the shift at highest horsepower opinion but if you drag it out higher, when you shift you lose less at the high rpm and you shift into higher horsepower in the next gear and more in your power band. Something i did alot of research about when driving a mustang
 
bigike said:
Why in GODS name does the viper engine shift at 5,500 +/- and my little ole 6.1 shifts a 6,200. I'm asking because i just got blown away by my wife in a flippin station wagon. Testosterone level is dropping sharply!

thanks
Jay
Click to expand...

The redline of an engine has nothing to do with it's HP or potential.

Redline is established by a number of factors. Rotating mass, stroke, valve train type (OHV vs OHC), and main/rod bearing diameters being some of the most common ones.

If you would like more information on how these items contribute to the redline of an engine let me know and I will explain it further.
 
Silverback said:
The redline of an engine has nothing to do with it's HP or potential.

Redline is established by a number of factors. Rotating mass, stroke, valve train type (OHV vs OHC), and main/rod bearing diameters being some of the most common ones.

If you would like more information on how these items contribute to the redline of an engine let me know and I will explain it further.
Click to expand...

Wait until I've had a few more beers so I can follow the discussion...:D
 
bigike said:
I agree about the shift at highest horsepower opinion but if you drag it out higher, when you shift you lose less at the high rpm and you shift into higher horsepower in the next gear and more in your power band. Something i did alot of research about when driving a mustang
Click to expand...


that there is a never ending sentence bro........


depends on where the power is at
 
Silverback said:
I figured as soon as I mentioned "Rotating Mass, and Stroke" you would be here.
Click to expand...

See there's proof I ain't drunk enough to keep up, how'd I miss those references...Tittie Girl, go get me a beer now, I'm slippin!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
you should shift somewhere between max hp in current gear, and max tourque in next gear. it usually ends up being slightly higher than the highest HP rpm. you dont want to shift too soon and be below the max torque. which on a v-10 is pretty mute anyway so I'll shut up now
 
I can tell you when I shift @ 5500, the truck bogs in the following gear...
 
me too it seems like its still pulling and wants to pull above 5500 and when it gets in the next gear it wants to lay down alittle before getting back into it's sweet spot.
 
If you are really interested in the shift sweet spot then you should invest in a a baseline dyno run and a shift light. Everybody's truck is a little different on peak HP as well as some consideration to gearing.

My HP curve has changed with each significant mod and is between 6000 and 6100 currrently, it used to be at 5750.
 
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