5600 Shift Extension with a CircleD 2E
Thread Starter
Joined: Aug 2004
Posts: 11,258
Likes: 146
From: Pace, FL
5600 Shift Extension with a CircleD 2E I've been doing some tuning with my new gears and the newer cam trying to get ready to go do some 1/8 trips and been working on shift points.
Right now, my 2-3 shift is showing an 1100rpm drop and my 1-2 I haven't been able to make a clean WOT 1-2 yet.
The 2E is supposed to be pretty loose. An 1100rpm drop means either my car isn't making any power or the stall is too tight.
What should I be looking for mechanically or in the tune? Should I expect less shift extension on the 2-3 from 1-2? I always thought they were about the same?
Right now, my 2-3 shift is showing an 1100rpm drop and my 1-2 I haven't been able to make a clean WOT 1-2 yet.
The 2E is supposed to be pretty loose. An 1100rpm drop means either my car isn't making any power or the stall is too tight.
What should I be looking for mechanically or in the tune? Should I expect less shift extension on the 2-3 from 1-2? I always thought they were about the same?
Maybe we should have traded. My car dynod 500/415 but my ss4000 only has 800 extension in 1st and 2nd and I'm planning on spraying a little on top. Shifts from 62-6700 didn't change extension. Yank recommended pas3400 so it's in and waiting to be tested now.
My vote is more power. Make the converter work good now and it'll be junk with more power and you'll be redoing it again.
My vote is more power. Make the converter work good now and it'll be junk with more power and you'll be redoing it again.
Thread Starter
Joined: Aug 2004
Posts: 11,258
Likes: 146
From: Pace, FL
Well it drives a bit looser than I want and is tighter uptop. Overall, the opposite of what you want.
But I agree... with another 100-150HP behind it, it'd probably be even better.
So you're falling back to 5600 even at 6700?
But I agree... with another 100-150HP behind it, it'd probably be even better.
So you're falling back to 5600 even at 6700?
No I'm only dropping 800rpm plus or minus 20rpm regardless where i shift from 6200 and up. I was also showing only 88% efficiency at 7000rpm on the track and much less on the dyno. With yoir extension I'm pretty sure yours is coupling good up top.
Thread Starter
Joined: Aug 2004
Posts: 11,258
Likes: 146
From: Pace, FL
Yeah, I'm showing 5% slip @ 6900 based on TCI's calculator.
But my shift extension didn't move. It falls back to 5600 at 6600, 6700, 6900 shifts.
I'm thinking behind a 416 or 427 it would be a great converter as long as I'm running it up to 7K or more.
But my shift extension didn't move. It falls back to 5600 at 6600, 6700, 6900 shifts.
I'm thinking behind a 416 or 427 it would be a great converter as long as I'm running it up to 7K or more.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Yank told me 1000rpm drop is money, and thats about what mine does. 100/200/300 rpm variance aint gonna do **** on a time slip as ive literally been on the limiter then fixed the issue and the car went no faster. Its not gonna cost you anything is what im getting at.
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Thread Starter
Joined: Aug 2004
Posts: 11,258
Likes: 146
From: Pace, FL
Okay. It runs hard. Just looking at my logs, I'm hitting .94g cellmass around where it drops on the shift. And it stays above .92g to 6500. So it's dropping right back down into the sweet spot and pulls hard to 6900.
Got the tune and shift extensions dialed in pretty good. Now I need to work on the launch. I may be too heavy, but I hope it has a 7.2 or better in it 1/8 mile.
Got the tune and shift extensions dialed in pretty good. Now I need to work on the launch. I may be too heavy, but I hope it has a 7.2 or better in it 1/8 mile.
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Verdad Gallardo Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
A lot of et is traction. Once you get that, and tune is right, it sort of runs what it runs. The most consistent gains Ive seen have been weight reduction. It always delivers.....heads ported, bigger cam, bigger converter, hard part changes sometimes dont deliver or take a while to show, so it can be frustrating. Also dont nitpick AFR and shift points, cause if they are even in the ballpark there wont be much gain either (talking NA). I think Ive tried it all 
Agreed with the above a lot. Power only gets you at most 50% of the way to a quick et. Good suspension helps but weight is what really drops et. Weight usuall cost money and its something nobody will ever see so its hard to get myself to go after it. But its all I have left to do so it will be happening sooner than later.
Thread Starter
Joined: Aug 2004
Posts: 11,258
Likes: 146
From: Pace, FL
Good advice guys.
I was about to swap the converter to something tighter and throw a Procharger on it. But it's running well now. May just enjoy it this year and run it every weekend and see if I can get the ET where it'll run and then look at a new setup for next year.
I was about to swap the converter to something tighter and throw a Procharger on it. But it's running well now. May just enjoy it this year and run it every weekend and see if I can get the ET where it'll run and then look at a new setup for next year.
On The Tree
Joined: Jan 2004
Posts: 166
Likes: 2
From: Bahrain
Circle D didn't recommend the 2e for nitrous and told me to the 4c instead.. But I think 2e will work with Nitrous.. It's a bit loose but not too much.. And it's effecient and tightens up with more rpm. Let. E know how it goes.. I'm getting a glide or turbo 400 from fti
On my 3e, I have been talking to Chris due to seeing around 300 rpm drop on the 1-2 shift and around 4-500 rpm on the 2-3 shift. 1-2 he reccommends 800 rpm. On the 1-2 shift it may be less, but on the 2-3, likes to see around 700-1000 rpm drop for peak performance in an NA setup.
Thread Starter
Joined: Aug 2004
Posts: 11,258
Likes: 146
From: Pace, FL
That 1300 drop is on the 2-3. I was hoping to see 6000-6100.
But either way, I'll probably move to the 3C Triple Disk. Lockup WOT is what I want with a much tighter stall for driving around and for building boost off the line... D1X now happening.
But either way, I'll probably move to the 3C Triple Disk. Lockup WOT is what I want with a much tighter stall for driving around and for building boost off the line... D1X now happening.