shift points - a4
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Instructor
Joined: Dec 2004
Posts: 166
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shift points - a4
where does a '00 c5 a4 make max power at? im about to reprogram my shift points on my predator. i had it set at 6100rpms across the board. i think these shift point hurt me in the 1/4. i going to set 1st at 5750, 2nd at 5800, 3rd at 6000 and 4th at 6000, i think i should be able to pick up some ET with the new shift points.......
your opinions please?
your opinions please?
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 179
From: S.W. Ohio. . . . . . NRA Life Member
there are two fields for Predator shift points - RPM and MPH. On a mostly stock motor, set your individual gear shift RPM's to whatever your redline RPM is. Then set your global rev limiter 100 to 200 RPM above that.
To determine the MPH; place your A4 into "1" and take the car up to redline... note the MPH.
Do the same except with the tranny in "2". And if you're brave - with the tranny in "3". Set your shift MPH to 3 below those numbers.
Further tweaking may be necessary.
To determine the MPH; place your A4 into "1" and take the car up to redline... note the MPH.
Do the same except with the tranny in "2". And if you're brave - with the tranny in "3". Set your shift MPH to 3 below those numbers.
Further tweaking may be necessary.
Last edited by Mike Mercury; Aug 2, 2005 at 07:36 PM.
Racer
Joined: Jun 2005
Posts: 393
Likes: 0
Shift Points
Originally Posted by C5Generl
where does a '00 c5 a4 make max power at? im about to reprogram my shift points on my predator. i had it set at 6100rpms across the board. i think these shift point hurt me in the 1/4. i going to set 1st at 5750, 2nd at 5800, 3rd at 6000 and 4th at 6000, i think i should be able to pick up some ET with the new shift points.......
your opinions please?
your opinions please?
According to my G-Tech the LS1 develops maximum horsepower in the 5200 RPM range. The horsepower begins to drop after that. It makes no sense to me to run it up to 6000 or more RPM and risk hurting the engine when there is nothing to be gained according to my instrumentation. In fact, the stock factory shift points at 5500 to 5800 RPM starting out in third on my A4 seem to be optimal and have yielded my best times versus shifting at a higher RPM.
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 179
From: S.W. Ohio. . . . . . NRA Life Member
It makes no sense to me to run it up to 6000 or more RPM and risk hurting the engine when there is nothing to be gained according to my instrumentation
You may be slightly past the power curve after 5200rpm - but the HP/TQ between 5200 and 6000 may still be more than the HP/TQ at the RPM it drops-to immediately after the shift.
That's why the 6 speed manuals are mathematically superior to the A4. Because with 4 gears to use before overdrive - they don't drop as far in RPM after a shift as us A4 guys do. All about keeping the engine in the power band.
If we had 5 or 6 speed automatics - then I'd agree - that would be a different story then.
Here's my actual time slip - with 6000rpm shifts -
2002 - A4 bone stock except for:
*3.42 rear axle upgrade
*Z06 airlid
*K&N drop-in OEM filter
*Predator DIY tune
still using factory tires and stock converter.
.
Last edited by Mike Mercury; Aug 2, 2005 at 10:13 PM.
Burning Brakes
Joined: Apr 2003
Posts: 908
Likes: 2
From: TROY MI
Originally Posted by leeman
According to my G-Tech the LS1 develops maximum horsepower in the 5200 RPM range. The horsepower begins to drop after that. It makes no sense to me to run it up to 6000 or more RPM and risk hurting the engine when there is nothing to be gained according to my instrumentation. In fact, the stock factory shift points at 5500 to 5800 RPM starting out in third on my A4 seem to be optimal and have yielded my best times versus shifting at a higher RPM.
Last edited by yankeevetteconvert; Aug 2, 2005 at 10:07 PM.
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 179
From: S.W. Ohio. . . . . . NRA Life Member
Originally Posted by yankeevetteconvert
When you shift into the next gear your RPM drops to around 4000 RPM and your HP is much lower. You want to stay in gear as long as the HP is more than it is at 4000 RPM.On a stock engine this is in the 6000 RPM range.I have found on my vehicle that my best et's are obtained when I shift at 6100/6200 RPM.
G-Tech meters are great for A-B or before/after comparisons... but the real world is on the street or at the track. There is where one learns that not all answers are found on the slide-ruler.
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