When the best time to shift?

[herbj]

Shift at max. TORQUE or HP or some degree of comprimise.
Just had a Transgo shift kit installed, I want to make the best use of it. Some say shift at WOT others say manually shift at peak power. Any thoughts?
Also at what RPM is peak torque and peak hp made. My 5.9L wil twist to 5600RPM.

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99' Ram 2500 QC,5.9L,Flowmaster Cat-Back 50 Series Duals w/chrome Tips, Mopar Performance Computer, Aftermarket Tach., Horse Head Taillight Covers, Headlight Blackouts, Eagle Eye Clear Running Lights, Rockford 100a2 Amp On a Becker 12" Subwoofer In Homemade Sealed 1.8qf Box, Flush Mounted Tweeters, Midland CB with center Roof Mount Commercial Antenna And 250Watt Pace Linear,Mopar Cold Air Induction Filter,Custom Muscle Ram Decal,Transgo Shit Kit.
Planned Mods: Headers, Body stripes. "just Getting Started"

[Cameron's Racing]

When racing you shift to keep it in the torque range. If 5600 is your limit then shift at 53 or 54 so you dont hit the flat spot. HP & torque?

Regards,

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66 Belv 440 auto 10.76 @125
69 RR 426 wedge auto 9.69 @ 140

[This message has been edited by Cameron's Racing (edited December 23, 2000).]

[herbj]

My engine produces max.tq @ 3200rpm and max.hp @ 4400rpm. Why shift @ 52-5400rpm isn't that my flat spot? Should I shift @ 4400rpm at max.hp?

I'm new to this performance so please be patient with my questions.

Regards

[cuda367]

First, how do you knwo the peaks. Sales Literature? With the computor change the power band changed. We try to take the drag cars about 400-500 above peak HP. just a guestamate for you would be 5000 -5200. seat of the pants and a little playing should tell you. some vehicles also like to be short shifted out of first ie at a low rpm.

[herbj]

Cuda367,
Since my truck is a automatic I can't short shift it without installing a full manual valve body. I'm not against doing this but I would need a floor shift to make it work properly.
Any other suggestions to try?

Thanks,

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99' Ram 2500 QC,5.9L,Flowmaster Cat-Back 50 Series Duals w/chrome Tips, Mopar Performance Computer, Aftermarket Tach.,Mopar Cold Air Induction Filter, Horse Head Taillight Covers, Headlight Blackouts, Eagle Eye Clear Running Lights, Rockford 100a2 Amp On two Becker 12" Subwoofer In Homemade Sealed 1.8qf Boxs, Flush Mounted Tweeters, Midland CB with center Roof Mount Commercial Antenna And 250Watt Pace Linear,Custom Muscle Ram Decal,Transgo Shit Kit.
Planned Mods: Headers, Body stripes. "just Getting Started"

[gthomas]

herbj.... I would recommend finding a dyno shop and find out where your power band is. I would shift at the point the next gear will fall into the power band (ya gotta know your gear ratio in each gear).

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1972 340 Duster
-Dyno @ 420hp/440ftlbstq
-Built 727 w/3000 stall
-3000lbs
1999 2500 4x4
-V10 w/5sp
-Manual xfer case

[cmyindy]

herbj your truck is pretty much stock the max out put on a 5.9 is 4800rpms so you should shift at 4900rpms. the stock cam will make you loose hp and tc after 5000rpms. the pcm will cut fuel and timing at 5400rpms i race my 5.9 all the time and shift at 5500rpms.look here to see what i have done http://home.talkcity.com/ThePits/rm_indy/S-Cindy.html thanks cmyindy