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 1st to 2nd shift tuning

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Name : Samuel
Age : 45
Location : Niagara Co.
Joined : 2007-06-10
Post Count : 381
Merit : 11

PostSubject: 1st to 2nd shift tuning   Wed Mar 14, 2012 5:37 am

When I get on it off the line, first gear seems to wind out more than I like into second. Every other part of the shifts feels just fine at any speed. If driving casual 1st to 2nd isn't bad. When driving spirited, I always wait for her to shift to 2nd then engage the Supercharger. Can I tweek this!
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Name : Aaron
Age : 40
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18330
Merit : 240

PostSubject: Re: 1st to 2nd shift tuning   Wed Mar 14, 2012 9:42 am

Yes, the shift points can be adjusted with DHP PowrTuner or HPTuners software.

However, the PCM is supposed to hold the gears out longer at higher throttle %, as this lets you use your power & torque for better acceleration. The SC is engaged in 1st gear, especially at higher RPM! If you lower the 2nd gear shift RPM, the car will not accelerate as quickly. I've pushed mine up even higher to hold the shifts longer.

'98 SC Riviera 281k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO 85k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun

'70 Olds Ninety-Eight Holiday Coupe 116k miles 455 Rocket V8
Because cool

'95 Celica 152k miles 0-60: yes
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Name : Charlie
Age : 32
Location : Toledo, OH
Joined : 2011-05-17
Post Count : 3911
Merit : 30

PostSubject: Re: 1st to 2nd shift tuning   Tue Dec 03, 2013 10:09 pm

I think what Sam might have been referring to is the lag between the 1st and 2nd shift at WOT. At least that's my concern.

I notice a delay between shifts that feels like acceleration is lagging because of it. Do you guys know what I'm talking about?

Is this shift pressure? shift speed? Scott?

Are there ideal values we should be tuning our trans to?

Please teach me!

Thank you!
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Name : Scott
Location : Macomb, Michigan
Joined : 2010-02-24
Post Count : 4212
Merit : 176

PostSubject: Re: 1st to 2nd shift tuning   Wed Dec 04, 2013 10:14 am

It's Shift Time, and Shift Pressure that will make those shifts faster. The lower the Shift Time, the faster is shifts. The higher the Shift Pressure, the harder it will shift.
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1st to 2nd shift tuning
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Riviera Performance ::   Supercharged 3800 Tech :: Series II Scans, Tuning, PCM-
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