First impressions, Edge Street converter (lock-up)

[Dusty Bradford]

What size are they? doesn't say in link, 9.5" ?

It will be classified as a 9.5" or 10" like most of the other true 3000ish rpm stall lock-ups for these cars. They are all built from a GM245mm core.


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[turb0buick57]

Is it worth refreshing a l/u 10in /245 converter that slips too much through the traps at the track, or is it similar price to buying a new converter?

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[SCOOBY DOO]

If you're going to be racing your car at the track...then I'd get a properly stalled NL convertor for your turbo and goals.

 

[Dusty Bradford]

Is it worth refreshing a l/u 10in /245 converter that slips too much through the traps at the track, or is it similar price to buying a new converter?

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The only way to make it slip less through the traps is to tighten it up. What is your rpm at 1# of boost? What's your combo? What et and mph? By tightening it everywhere it will slow down spool up. If the converter has a high stall speed at 1 psi and your turbo isn't to large, you can simply tighten it up and be ok.


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[turb0buick57]

The 10inch was 2700 at 0-1# boost on a stock longblock ta49 with alky combo. The powerlogger had it slipping 16% at the end of the quarter. Was doing 11.99 at 111/112

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[Dusty Bradford]

The 10inch was 2700 at 0-1# boost on a stock longblock ta49 with alky combo. The powerlogger had it slipping 16% at the end of the quarter. Was doing 11.99 at 111/112

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It may have something damaged or the wrong configuration. If it stalls that low at 1psi it should have lower slip at that power level.


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[V6POWER]

Finally got to the track with the Edge converter to compare it to the PTS 9/11, using the 6262 jb.

Running Edge tc:
1.592 (60')
4.445 (330')
6.892 (1/8 et)
101.21 (1/8 mph)
3600 (launch rpm @ 0 mph)
10.6# (launch boost @ 0 mph)
24.0* (launch timing)
21* (3rd gear timing)
5400-5050 (1-2 shift)
5650-5250 (2-3 shift)
10.6 (target af)
23-24# boost

Running PTS 9/11 tc:
1.520 sec.
4.347 sec.
6.795 sec.
101.31 mph
3750 rpm
12.0#
23*
21*
5550-5100 rpm
5650-5150 rpm
10.8
26-27#

Two things I noticed were the shift points and I only ran .1 slower with 3# less boost with the Edge. Both runs were done using 93 + alky + 2 gals. 110 and both runs were in November (2014 and 2012). I did not lock either tc.
Combo in sig.

 

[V6POWER]

Wow, I thought this would generate some comments or questions.

Should the lower rpm drop on shifts with the Edge be of concern?

 

[Sydwyndr]

Jim there are things you not listing.. What was track temps?? What was the air temp and water grains??
2 years apart alot can change. Unless you did back to back comparisons on the same / similar days / track conditions its hard to say.

 

[V6POWER]

Jim there are things you not listing.. What was track temps?? What was the air temp and water grains??
2 years apart alot can change. Unless you did back to back comparisons on the same / similar days / track conditions its hard to say.

I know, not a fair comparison for several reasons, but at least the combo was the same and both runs were in the cooler November weather. Also, Pat drove the 6.79 pass and I drove the 6.89 so Pat's better driving probably accounted for the better 60' on the 6.79. It appears traction was not a problem on either run though. I just thought it interesting that one run was done on 3# less boost.

What are 'water grains'?

Should I be concerned with the lower rpm drop on the shifts with the Edge?

 

[20psiofevil]

Should the lower rpm drop on shifts with the Edge be of concern?

My rpm drops to 5300rpm with 373 gears and 26" tire but I rev my motor out to 6000rpm when I had the 62mm. I'd guess you'd be around the 10% slip range crossing the line in the 1/4 mile. Mine shows 12% slip at the top of the 8th mile trapping 102mph. The converter is more efficient with more rpm so I'd see less slip if I raced the 1/4 mile. 10% slip is pretty good btw.

 

[Grumpy]

I'd be curious to see 1/4 miles runs.. See the mph gain from the 1/8th to 1/4.

 

[V6POWER]

How do I determine tc slip for the 1/8 th.?

I would also like to see how this tc would run in the 1/4 but there aren't any good 1/4 tracks nearby.

 

[bison]

How do I determine tc slip for the 1/8 th.?

I would also like to see how this tc would run in the 1/4 but there aren't any good 1/4 tracks nearby.

You need to have a driveshaft sensor and look at the top of each gear. There's no good way to get the data at the 1/8 mile because you will still be driving into the converter really hard since you are crossing the trap not far into 3rd. Id be most concerned with the flash stall and the engines peak output. The car will be quicker with the engine kept as close to that rpm the longest.


BPE2013@hotmail.com

 

[V6POWER]

Id be most concerned with the flash stall and the engines peak output. The car will be quicker with the engine kept as close to that rpm the longest.


BPE2013@hotmail.com

Based on the above data, is my flash stall around 350-400? What rpm should I be trying to maintain? Thanks.

 

[TTA976]

Based on the above data, is my flash stall around 350-400? What rpm should I be trying to maintain? Thanks.

Hello, your stall speed can be given by the RPM after the 2/3 shift under full load. Not the RPM drop from 2/3rd... Should drop atleast 800 RPM on shifts, fyi. Sounds to be too loose if it's only dropping 400 RPM. You should check again. Also, the converter could be right but if your shift rpm is too low, it will seem like the converter is loose too.

Joe

 

[bison]

The rpm drop isn't important. You can shift later and make the rpm drop more but likely slow the car down. The flash stall is very important. Making the converter work hard is what will get you down the quarter mile quicker.


BPE2013@hotmail.com

 

[V6POWER]

Hello, your stall speed can be given by the RPM after the 2/3 shift under full load. Not the RPM drop from 2/3rd... Should drop atleast 800 RPM on shifts, fyi. Sounds to be too loose if it's only dropping 400 RPM. You should check again. Also, the converter could be right but if your shift rpm is too low, it will seem like the converter is loose too.

Joe

So based upon the data above, my stall speed should be about 5200?

The 2-3 shift drop was only 450 for the Edge and 500 for the PTS. RPM at 0-1 boost on the foot brake was 3100 for the Edge and 2500 for the PTS, neither close to 800 as suggested. Does this tell you anything?

The shift points were about the same for each converter. Do I need to raise the shift points?

Thanks for any and all help everybody. I just want to get the max potential out of the tc.

 

[bison]

So based upon the data above, my stall speed should be about 5200?

The 2-3 shift drop was only 450 for the Edge and 500 for the PTS. RPM at 0-1 boost on the foot brake was 3100 for the Edge and 2500 for the PTS, neither close to 800 as suggested. Does this tell you anything?

The shift points were about the same for each converter. Do I need to raise the shift points?

Thanks for any and all help everybody. I just want to get the max potential out of the tc.

You need to run your car, gather data, and make small changes and see if it helps. Some things will help a little, some a lot, some will slow you down.


BPE2013@hotmail.com

 

[V6POWER]

You need to run your car, gather data, and make small changes and see if it helps. Some things will help a little, some a lot, some will slow you down.


BPE2013@hotmail.com

As far as the tc goes, just leave the shift points alone? I do play with timing and afr a little with the FAST. Thanks.