406 SuperRam A4 3.07 Shift Points
Thread Starter
Instructor
Joined: Dec 1999
Posts: 161
Likes: 0
From: Atlanta Ga
406 SuperRam A4 3.07 Shift Points
According to the RW dyno,my peak torque is 477@3200
Peak HP about 5000
What have you guy learned by experimenting with shift poins on
SuperRam automatics
Peak HP about 5000
What have you guy learned by experimenting with shift poins on
SuperRam automatics
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Look at the shape of the torque curve. Does it drop like a stone, like our stock TPI, or does it roll off slowly after peak?? You will get best 1/4 mile times if you maximize the area under the power curve.
For example,:
shift point........after 1-2 shift........after 2-3 shift
5,000 rpm...........2,650 rpm.............3,060 rpm
5,500 rpm...........2,920 rpm.............3,370 rpm
6,000 rpm...........3,180 rpm.............3,670 rpm
So, on your dyno plot, mark these points and chose shift points that give maximum area under the curve between the before/after RPM points. Don't worry that power is dropping off after the peak. Remember that you have much more torque to the rear wheels in each lower gear. That is why this method works.
With my siamese intake base peak HP comes 300rpm higher than with stock TPI but rolloff is now so gradual (60hp more at 6,000rpm) that I've upped my shift points to high 5k RPM region.
Since you have a dyno plot for your setup you can feed those numbers (corrected to engine HP) into a software package called Drag2000 and experiment with shift points to get the best time slip.
For example,:
shift point........after 1-2 shift........after 2-3 shift
5,000 rpm...........2,650 rpm.............3,060 rpm
5,500 rpm...........2,920 rpm.............3,370 rpm
6,000 rpm...........3,180 rpm.............3,670 rpm
So, on your dyno plot, mark these points and chose shift points that give maximum area under the curve between the before/after RPM points. Don't worry that power is dropping off after the peak. Remember that you have much more torque to the rear wheels in each lower gear. That is why this method works.
With my siamese intake base peak HP comes 300rpm higher than with stock TPI but rolloff is now so gradual (60hp more at 6,000rpm) that I've upped my shift points to high 5k RPM region.
Since you have a dyno plot for your setup you can feed those numbers (corrected to engine HP) into a software package called Drag2000 and experiment with shift points to get the best time slip.
Last edited by 65Z01; Apr 16, 2005 at 09:14 PM.
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Originally Posted by Snakeskinner
According to the RW dyno,my peak torque is 477@3200
Peak HP about 5000
What have you guy learned by experimenting with shift poins on
SuperRam automatics
Peak HP about 5000
What have you guy learned by experimenting with shift poins on
SuperRam automatics
Thread Starter
Instructor
Joined: Dec 1999
Posts: 161
Likes: 0
From: Atlanta Ga
Thanks guys!
Currently my 1-2 shift is @ 5375,drops back 1700 to 3675.
2-3 is @ 5250,drops about 1700 back to 3350.
If the drop back is 1700 rpm consistently and the torque peak is 3200,
looks like 4900 or so would put be on torque peak.
I seem to recall that someone , maybe JL,said to shift so as to drop
back on torque peak.
Ski did you & CorkVette experiment with higher shift points?
Ralph have you done any experimenting?
Currently my 1-2 shift is @ 5375,drops back 1700 to 3675.
2-3 is @ 5250,drops about 1700 back to 3350.
If the drop back is 1700 rpm consistently and the torque peak is 3200,
looks like 4900 or so would put be on torque peak.
I seem to recall that someone , maybe JL,said to shift so as to drop
back on torque peak.
Ski did you & CorkVette experiment with higher shift points?
Ralph have you done any experimenting?
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
Originally Posted by Snakeskinner
According to the RW dyno,my peak torque is 477@3200......Peak HP about 5000
What kind of cam and heads are you running?
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Originally Posted by Snakeskinner
Thanks guys!
Currently my 1-2 shift is @ 5375,drops back 1700 to 3675.
2-3 is @ 5250,drops about 1700 back to 3350.
If the drop back is 1700 rpm consistently and the torque peak is 3200,
looks like 4900 or so would put be on torque peak.
I seem to recall that someone , maybe JL,said to shift so as to drop
back on torque peak.
Ski did you & CorkVette experiment with higher shift points?
Ralph have you done any experimenting?
Currently my 1-2 shift is @ 5375,drops back 1700 to 3675.
2-3 is @ 5250,drops about 1700 back to 3350.
If the drop back is 1700 rpm consistently and the torque peak is 3200,
looks like 4900 or so would put be on torque peak.
I seem to recall that someone , maybe JL,said to shift so as to drop
back on torque peak.
Ski did you & CorkVette experiment with higher shift points?
Ralph have you done any experimenting?
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Thread Starter
Instructor
Joined: Dec 1999
Posts: 161
Likes: 0
From: Atlanta Ga
Thanks,but I dont think I have it optimized.
The heads are unmodded TrickFlow 195 #30400007 cnc,with cnc ed combustion chambers.They come with the right spring setup for a hydralic roller cam,they built good torque numbers,with the SuperRam.
I used the GM 846 (Crane) cam,which is extremely docile with the A4 & 307.AlthoughI dont know that its any better than the JF 219 for this app.I went from a 345 RE to 307 RE Per BeachBum's experience,it is really fine on the hwy,and will go down to 1200 rpm in od without bucking.The block is overkill for my application its a Garry Grime's Bowtie with lunati pistons, 6" rods and crank,but it is MiniRam ready if I go that way(I bought it used and refreshed it)This motor is not as powerful as Ski's SR 406 was,for whatever reason.I will post my dyno run if some will tell me how to attach it.David Fulcher keeps it all going for me.
The heads are unmodded TrickFlow 195 #30400007 cnc,with cnc ed combustion chambers.They come with the right spring setup for a hydralic roller cam,they built good torque numbers,with the SuperRam.
I used the GM 846 (Crane) cam,which is extremely docile with the A4 & 307.AlthoughI dont know that its any better than the JF 219 for this app.I went from a 345 RE to 307 RE Per BeachBum's experience,it is really fine on the hwy,and will go down to 1200 rpm in od without bucking.The block is overkill for my application its a Garry Grime's Bowtie with lunati pistons, 6" rods and crank,but it is MiniRam ready if I go that way(I bought it used and refreshed it)This motor is not as powerful as Ski's SR 406 was,for whatever reason.I will post my dyno run if some will tell me how to attach it.David Fulcher keeps it all going for me.