PTC 15 and 16 Blade Stator Owners, What's Your Slippage, Info?

GNVYUS 1

Well-Known Member
I've got a PTC 9.5 (maybe 2008) with the 17 blade stator but my combo hasn't evolved to where I thought it would, so I'm eventually gonna bail on this stator.

My converter data
17 blade at 6k in 2nd is 10.5% slippage.
28", 1.57 gear, 3.42 rear, 84mph
Not real pumped about the above, my 10" PTC 0 blade in my GTO is 3.5% at 92mph in 2nd so it's possible to be tight up top.

If you have a 15 or 16 blade in your 9.5" PTC what's mainly your slippage but if you know....

Turbo, heads, 0psi stall, slippage?

I hope to hear from Dusty to get his thoughts.
Thanks
 

Mr.Spool

Well-Known Member
I've got a PTC 9.5 (maybe 2008) with the 17 blade stator but my combo hasn't evolved to where I thought it would, so I'm eventually gonna bail on this stator.

My converter data
17 blade at 6k in 2nd is 10.5% slippage.
28", 1.57 gear, 3.42 rear, 84mph
Not real pumped about the above, my 10" PTC 0 blade in my GTO is 3.5% at 92mph in 2nd so it's possible to be tight up top.

If you have a 15 or 16 blade in your 9.5" PTC what's mainly your slippage but if you know....

Turbo, heads, 0psi stall, slippage?

I hope to hear from Dusty to get his thoughts.
Thanks
We usually see slip numbers lower than that.
 

GNVYUS 1

Well-Known Member
Ya I'm gonna check the dyno runs and see if the load in 3rd helped but I have a feeling it's similar.

I don't need a 17 blade anymore but I'm curious what others have calculated with all 3 blades.
 

Nigel

Well-Known Member
16 blade PTC NLU.
Slip through a quarter run. The PL mph correction was used to correct for tire size and speedo gear, it matches the traps within 1 mph at the drag strip. Basic combo is in my signature. At the top of second the slip is a little over 20%, but the power to the ground is about at its maximum at that point, it becomes a matter of determining is the speed difference of the wheels due to fin angles, and is the stator recovering the energy back to the pump, or is the slip lost power transfer, whether that is clearances, flow separation, outside the stator effective range, and ...
Please let us know what Dusty comes back with.
1662459988952.png
 

Mr.Spool

Well-Known Member
Ya I'm gonna check the dyno runs and see if the load in 3rd helped but I have a feeling it's similar.

I don't need a 17 blade anymore but I'm curious what others have calculated with all 3 blades.
Are these dyno runs,street runs,track runs?
 

GNVYUS 1

Well-Known Member
Thanks Nigel, great post. Are we looking at around 7% at around 5450rpm?
If so, it probably tightens up a touch with more rpm.

11% was 2nd gear on the street at 6k.
I'll get the dyno run data soon and see what a loaded 3rd pull shows to around 5800.

Mr.Spool, you usually have a trove of secret street data, what can you allow out the cabinet for PTC slippage numbers?

Dusty will hopefully reply and I'll report back.
 

Sweet6

Well-Known Member
I just have end of run data mine is 7-8% at the end of the run at 5900- 6000 RPMs at 129-131 MPH
 

Mr.Spool

Well-Known Member
Mr.Spool, you usually have a trove of secret street data, what can you allow out the cabinet for PTC slippage numbers
It's based on what the car actually needs to run the number on the surface it's on.
Slippages need to vary depending 9n the conditions
Less slip doesnt mean it's faster all the time😉
In reality one must choose street vs track as the cars need to be setup differently.
Cant do both without making changes to a host of things=including the converter.
The dyno is a different animal as well I have seen drastic number changes between dynos.
In a nutshell run the car on the surface you want get real numbers like a timeslip or a draggy.
Make changes,there are a ton of things, then use the et and mph to see if you went in the right direction.
It's a little science not rocket lol.
There just is no substitute for testing.
Let put it this way I have seen plenty of 17 blade ptcs go fast😉
 

GNVYUS 1

Well-Known Member
On the highway = 2nd gear 10.5% slippage @ 6k

On the Mustang Dyno = 3rd gear 10.6% slippage @ 6k

But are showing the same slippage.

I somewhat get that slippage isn't always bad, but at the end of the gear it's not ideal if I can get it down to say 6-7%.
 

Nigel

Well-Known Member
On the highway = 2nd gear 10.5% slippage @ 6k

On the Mustang Dyno = 3rd gear 10.6% slippage @ 6k

But are showing the same slippage.

I somewhat get that slippage isn't always bad, but at the end of the gear it's not ideal if I can get it down to say 6-7%.
You could also try giving the guys at PTC a call and see what they recommend. You could consider asking them to tighten up your current converter a bit. They may have learned things in the last 14 years, so just an update may get you where you want to be.
 

GNVYUS 1

Well-Known Member
Talked to Lane at PTC, Dusty hasn't replied yet, going down to a 16 blade will knock out around 200rpm and roughly 2% slippage.

It's getting pulled eventually as the combo spools crazy fast and losing 200rpm isn't going to drastically change much in the low end but hopefully up top a converter rebuild and new stator will see mid digit slippage.
 

GNVYUS 1

Well-Known Member
Possible false alarm, maybe others are doing this so I'll post my embarrassing head slapper...

I'm using mph in the ECU which is using the stock VSS and assuming stock speedo trans gear etc. All of this is based on stock tire diameter of...
215/65/15 = 26"
Not a lot of us at
275/60/15 = 28"

Eric with ECUGN has informed me there's a way to edit the PULSE in Speed and Gears from 2000 to possibly get a more true mph.

There's also a GPS aspect which i will try doing in real time and edit the pulse and get really close but..

There's a tire calculator that's says our 28" tire is a 7.65% difference in speedo so
50mph = 54mph


After running corrected mph
84=90.5 mph

Slippage is 3.5% @ 6k rpm

This would be great if the above is true, super tight for a 17 blade IMO if 16 and 15 are tighter.
 

GNVYUS 1

Well-Known Member
3% on my 17 blade has been confirmed in the ECUGN logs using a calculation Bob and Eric are working on. Looks like the 2 ways to acheive the answer (tire size speedo calculator+slippage calculator or software) came to the same conclusion.

If you have a 16 or 15 blade post slippage so we all get an idea of what's going on out there with combos etc. Keep in mind tire size and stock speedo aren't the same, that got me which is why I started this thread.
 

Mr.Spool

Well-Known Member
What's going on is the ptc reaches a coupling point based on the power applied.
Due to the stator design.
Its usually 200rpm per blade
the plateau point will move based on the blade count and power being applied.
You were always slightly below 3.5%😉
 
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