Quote:
Originally Posted by oab_au
In the before chart we see the torque line rising fast at the start and slowly decrease as the speed rises. At about 34.5 MPH/6500RPM the fuel injection pulse to every second injector is turned off. At the first green line the band is applied and the box is in second gear. The rise in the torque line between the two green lines is the Torque converter slowing the engine down the necessary 2800 rpms. This is helped by the 50% torque cut that is on, but the torque still increases as the 2800 rpm difference brings the converters torque multiplication factor up to 1.9 times. As the engine slows and the speed difference reduces so does the torque factor. The peak of this is reached at about 36 MPH and the engine has come down to speed at about 37 MPH, the injection is brought back on gradually to conform to the “no change felt policy”, and the engine is restored to full power at about 38 MPH. All the time between the two red lines is the lag that we feel, about 4.5 MPHs worth.
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Harvey, I apologize ahead of time for not purchasing your kit when we talked PM (before I had the Level 10 done). I wasn't sure it was doing what Tina charts suggests. As for the bolded area above, I just wanted to confirm the time you suggested from the time I plotted on my dyno chart from a previous post.
Quote:
Originally Posted by Myxalplyx
Just bumping this up since crazy ideas keep popping into my head.
I still do not like the lose of fuel between shifts. Harvey stated that the fuel can continue to flow instead of being cut off between shifts. I have already contacted Level 10 and have been considering a valve body (Hydrosystem) job. I told them I would like to have the shifting on the firmer/harder/quicker side. The car feels like it shifts great but I sat down last night to look at a few things.
On the 1st to 2nd gear, the SVX is not making any power for 4.1 seconds on the dyno (29.7 to 33.8 second mark). On the 2nd to 3rd gear shift, it is not making any power for 2.6 seconds (59.5 to 62.1 second mark). That is a total of 6.7 seconds of power loss. I do not have data for the 3rd gear to 4th gear gear change time since I never took it that far on the dyno. Even still, 6.7 seconds of power loss out of a car that has been ran in the low 15 second range seems significant.
Power loss in 1st to 2nd gear has been as low as 84whp and from 2nd to 3rd gear as low as 92.5whp. How significant a drop in the 1/4 mile time can be achieved if you could turn these times of power losses to 100% power gains? In other words, make your shift change from 1st to 2nd and 2nd to 3rd power gain as much as it orginally lost after a valve body job.
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Just pointing out the 4mph you were talking about above, is what I noticed as well. That is significant to me.
http://www.subaru-svx.net/forum/show...Akit%2A&page=2
I am still wondering why the 2nd to 3rd gear shift is not as powerful as 1st to 2nd and 3rd to 4th.
Same 'issue' I have. I still do not like my 2nd-3rd gear shift even though it is still good. The 'neck-snapping' shift is not there or as apparent as the other gear shifts.
Harvey, congrats on your work. I want to purchase this kit despite the valve body job I have already. That 1-2 shift is neck snapping. I like a lot and I don't think I quite feel that much torque going through the gears. Good luck and I hope you sell a ton of these. I wish I could apply your kit to my XT6. I'd do it tomorrow.