Edit Review

[Guest]

Here it is. Why the animosity with me Pretzel, I havent been laughing at your car or its times?

Street Tuner,

Sorry nothing against you personally, I just see that people seem to be very quick to jump on some people when they quote/claim things (Like the claims of my car !) But in this case a valid question was seemingly ignored (Or missed) and there seemed only one person wanting answers !

I did notice you haven't been commenting on my car/claims (In fact you didn't want to get involved in it when asked), so I apologise for jumping on you on this one ! I may have typed before thinking... That happens some times, Bloody fingers !

No hard feelings ?

You are right Pretzel, judging from this post you are ignorant to the operation of an automatic gearbox or a hydraulic clutch arrangement. At full power with full commanded line pressure, the delay time in building transmission pressure can be substantial. One of the improvements we make to the shift process is to reduce commanded and calculated shift time, which means that although the transmission will shift with greater pressure than standard, it still may not be as high as existant as the same line pressure mapping with full torque reduction, and a slower overall shift speed.

Combine this with the operation of any frictional clutch arragement where the propensity to slip is increased with greater torque application, and my earlier statements begin to make complete sense. A good example would be the clutch in your own manual car Pretzel, which stopped it from running the full claimed 337rwkw on the dyno. My bet is that if you tootled along at 40km/h in second gear and pumped the clutch you could get a chirp out of the wheels. Flat shifting at full power though may not offer the same frictional drive from the clutch lining. Let me know if you require further clarification

<{POST_SNAPBACK}>

I kind of get what you're saying, but admit to not understanding the insides of an auto, but in the past when I have had auto's modified, I believe the increased line pressure(to force the next gear quicker), in conjuction with higher shift points has always turned a non-chirping box into a quick shifting chirper (In the same vehicle !) ! This is behind big V8's in the past though.

What is different there(Old boxes) to these boxes(New computer controlled) ?

Thanks

Pretzel

<{POST_SNAPBACK}>

This is a computer controlled line pressure increase though, which is never going to get as high as the pressure levels of a modified auto with a different valve body and pump.

Also, this is increasing the power near 30% at the same time as the line pressure increase.... I bet if you loaded the stock map with the modified auto settings you would get some chirping.

<{POST_SNAPBACK}>

lawsy I know that you can do line preasure, shift time and speed changes just dont know to what extent?

if you were to do line preasure and shift speed changes only there would be chirping present dhoteten the time it takes and less chirp?

[xrturb]

well ive been a bit quiet about edit and as I was reading the post about the thte intercooler pipe coming off I thought there should have been more power from the sct ,so I check and there it was pipe was off ...well I connected it and away I went ...the power is just magic and that is at 8psi I havae a manual and to just take off normally and plant isc and get wheel spin is great ..all I can say is damn double points

[rapt]

Is the EDIT home delivered or a pick up from the post office job ??

[geea]

well ive been a bit quiet about edit and as I was reading the post about the thte intercooler pipe coming off I thought there should have been more power from the sct ,so I check and there it was pipe  was off  ...well I connected it and away I went ...the power is just magic  and that is at 8psi I havae a manual and to just take off normally and plant isc and get wheel spin is  great ..all I can say is damn double points

<{POST_SNAPBACK}>

Brad will you be making the trek to WSID on Jan 12th. It would be great to see an edited T run down the 1/4.

Geea.

[Lawsy]

Here it is. Why the animosity with me Pretzel, I havent been laughing at your car or its times?

Street Tuner,

Sorry nothing against you personally, I just see that people seem to be very quick to jump on some people when they quote/claim things (Like the claims of my car !) But in this case a valid question was seemingly ignored (Or missed) and there seemed only one person wanting answers !

I did notice you haven't been commenting on my car/claims (In fact you didn't want to get involved in it when asked), so I apologise for jumping on you on this one ! I may have typed before thinking... That happens some times, Bloody fingers !

No hard feelings ?

You are right Pretzel, judging from this post you are ignorant to the operation of an automatic gearbox or a hydraulic clutch arrangement. At full power with full commanded line pressure, the delay time in building transmission pressure can be substantial. One of the improvements we make to the shift process is to reduce commanded and calculated shift time, which means that although the transmission will shift with greater pressure than standard, it still may not be as high as existant as the same line pressure mapping with full torque reduction, and a slower overall shift speed.

Combine this with the operation of any frictional clutch arragement where the propensity to slip is increased with greater torque application, and my earlier statements begin to make complete sense. A good example would be the clutch in your own manual car Pretzel, which stopped it from running the full claimed 337rwkw on the dyno. My bet is that if you tootled along at 40km/h in second gear and pumped the clutch you could get a chirp out of the wheels. Flat shifting at full power though may not offer the same frictional drive from the clutch lining. Let me know if you require further clarification

I kind of get what you're saying, but admit to not understanding the insides of an auto, but in the past when I have had auto's modified, I believe the increased line pressure(to force the next gear quicker), in conjuction with higher shift points has always turned a non-chirping box into a quick shifting chirper (In the same vehicle !) ! This is behind big V8's in the past though.

What is different there(Old boxes) to these boxes(New computer controlled) ?

Thanks

Pretzel

This is a computer controlled line pressure increase though, which is never going to get as high as the pressure levels of a modified auto with a different valve body and pump.

Also, this is increasing the power near 30% at the same time as the line pressure increase.... I bet if you loaded the stock map with the modified auto settings you would get some chirping.

lawsy I know that you can do line preasure, shift time and speed changes just dont know to what extent?

if you were to do line preasure and shift speed changes only there would be chirping present dhoteten the time it takes and less chirp?

If you were to run 1000nm through this box, do you think it would chirp?

I know it wouldn't, infact, it wouldn't shift at all, as the clutches wouldn't be able to keep up with the torque...

This effect is exponential with torque being transfered through the box. The more torque you give it, the slower the shift is going to be at any given line pressure.

People who do nothing to there auto transmission and give it another 100newies will notice how much slower the shifts are.

All this line pressure increase does is brings this slower shift time back to be a little better than standard with the increase in torque. If you weren't to do this pressure increase, the shift would be too slow and would feel sluggish compared to standard.

It is when you increase the pressure (via a new pump and valve body, massive increase) and overcompensate for that particular power level that you get a shift hard enough to spin em up through the gears. This sort of increase is best for the clutches as they don't heat up as much during shifts, which allows them to last longer. Remember, auto clutch compound breaks down with heat. Friction causes heat, thus if you limit the amount of sliping/friction the material has to cope with then you limit the wear.

If you feel the shifts themselves they should feel slightly harder, even if they don't seem faster, because the shift is transfering allot more torque....

My mate, who is a car nut as well, used to rebuild the things. We used to talk about this sort of thing all the time...

Hope that helps DW.

[Falchoon]

Great thread guys, very informative, mutch better than all the biatch fighting in the other SCT related threads.

[DBOSS]

I have noticed a slightly firmer gear change no were near as firm as having the auto upgrade that most people get but its not bad

[Falchoon]

I have noticed a slightly firmer gear change no were near as firm as having the auto upgrade that most people get but its not bad

<{POST_SNAPBACK}>

You'll have to take me for a ride in your car sometime Jeff. This is the thing I ws concerned about with DucatiJBs auto, too firm for me. I want more power but the driveability of a stocker, not chirp it through every gear.

What's the difference in the power mode of the trans? I always thought it was a bit strange with the BA after coming from EB 6cyl auto that there wasn't as much of a noticeable difference between the power and standard mode.

[Buf-Phoon]

I have noticed a slightly firmer gear change no were near as firm as having the auto upgrade that most people get but its not bad

<{POST_SNAPBACK}>

So I take it you've been flashed then Come on then ,out with it boy, tell us about the rest of it

[DBOSS]

I have noticed a slightly firmer gear change no were near as firm as having the auto upgrade that most people get but its not bad

<{POST_SNAPBACK}>

You'll have to take me for a ride in your car sometime Jeff. This is the thing I ws concerned about with DucatiJBs auto, too firm for me. I want more power but the driveability of a stocker, not chirp it through every gear.

What's the difference in the power mode of the trans? I always thought it was a bit strange with the BA after coming from EB 6cyl auto that there wasn't as much of a noticeable difference between the power and standard mode.

<{POST_SNAPBACK}>

Mate anytime Ross just as long as you dont let Ken smack your arse again or I'l have to sell it due to embarassment :lol: :lol:

Hard to say about the pwr mode difference as I've allways noticed a change from std to pwr