PT4000 vs. PT4400
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From: Dyess AFB, TX
PT4000 vs. PT4400 I've searched and searched and found alot of info, I just want to verify some of it:
-PT4000 shift extension is 5300 vs. 5900 for PT4400
-PT4000 has around a 2.5 STR vs. 2.7 or so for PT4400 (varies)
-PT4400 feels a tad looser but not by much
-I read somewhere the PT4000 would be better from a roll because it's more efficient but that doesn't make sense to me because of the 4400's higher shift extension
-Not much difference between the 2 at the track
-Both use same internals
Now, can someone touch on all of these subjects?
-PT4000 shift extension is 5300 vs. 5900 for PT4400
-PT4000 has around a 2.5 STR vs. 2.7 or so for PT4400 (varies)
-PT4400 feels a tad looser but not by much
-I read somewhere the PT4000 would be better from a roll because it's more efficient but that doesn't make sense to me because of the 4400's higher shift extension
-Not much difference between the 2 at the track
-Both use same internals
Now, can someone touch on all of these subjects?
Last edited by LS1BlackZ28; Nov 25, 2003 at 12:53 AM.
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From: Troy, AL
"-PT4000 shift extension is 5300 vs. 5900 for PT4400"
This is off a bit I think. Heck, my SS4000 has a 5350 SE but this is with a ~6600-6700 shift point which will have a small effect on SE. The PT4000 is surely better than that. I'd guess more like 5500.
2.2 STR compared to 2.5 STR according to Yank's site but I believe this is customizable to a degree.
The PT4400 would be better from a roll because of it's superior SE. 400 RPM of shift extension has alot more to do with it that 1% of efficiency.
Not much difference at the track? I guess it's according to what you consider a significant amount. I'd say they are within a half tenth at the track in an 11 second car.
Yeah, pretty much the same internals I believe.
This is off a bit I think. Heck, my SS4000 has a 5350 SE but this is with a ~6600-6700 shift point which will have a small effect on SE. The PT4000 is surely better than that. I'd guess more like 5500.
2.2 STR compared to 2.5 STR according to Yank's site but I believe this is customizable to a degree.
The PT4400 would be better from a roll because of it's superior SE. 400 RPM of shift extension has alot more to do with it that 1% of efficiency.
Not much difference at the track? I guess it's according to what you consider a significant amount. I'd say they are within a half tenth at the track in an 11 second car.
Yeah, pretty much the same internals I believe.
correct me if i am wrong here, i am slowly starting to learn this stuff, but as for as SE goes, wouldnt that depend on the car itself and what mods have been done, like my car only being stock internal may have a SE of 5600 with the PT4400 but a H/C car would see the 5900 SE 
FYI: 1.50 60' w/YPT4400 in my stock internal car at 3400+ raceweight
FYI: 1.50 60' w/YPT4400 in my stock internal car at 3400+ raceweight
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From: Troy, AL
Sure, like stall speed, it's going to be effected by the power made at the RPMs that we're talking about. In other words, if our SE is 5000 then the power made at 6100 is going to have much less to do with it than the power made at 5100.
Having said that, I don't think that SE is effected in a major way by heads/cam as much as it would be larger CI.
When I give an estimated SE, it's assuming stock CI.
Having said that, I don't think that SE is effected in a major way by heads/cam as much as it would be larger CI.
When I give an estimated SE, it's assuming stock CI.
-PT4000 shift extension is 5300 vs. 5900 for PT4400
Shift extension is much closer. Don't expect more than about 300, maybe 400 rpm difference
-PT4000 has around a 2.5 STR vs. 2.7 or so for PT4400 (varies)
That is pretty accurate. The 4000 may be a tad lower.
-PT4400 feels a tad looser but not by much
I have had both the 4000 and 4200 and they felt the same. Could not tell them apart.
-I read somewhere the PT4000 would be better from a roll because it's more efficient but that doesn't make sense to me because of the 4400's higher shift extension
The 4000 is more efficent. If you wind out 3rd gear in racing from a roll, I'd take the 4000's efficency over the 4400's shift extension. I went with the 4200 because from a roll it is more efficent than a 4400 and has nearly the same shift extension.
-Not much difference between the 2 at the track
For Pure track use, I'd take the 4400. The extra stall and midrange should be worth at least .05.
-Both use same internals
Pretty much. I'm not sure if the 4000 uses the same pump with a blade angle adjustment or different pump.
Shift extension is much closer. Don't expect more than about 300, maybe 400 rpm difference
-PT4000 has around a 2.5 STR vs. 2.7 or so for PT4400 (varies)
That is pretty accurate. The 4000 may be a tad lower.
-PT4400 feels a tad looser but not by much
I have had both the 4000 and 4200 and they felt the same. Could not tell them apart.
-I read somewhere the PT4000 would be better from a roll because it's more efficient but that doesn't make sense to me because of the 4400's higher shift extension
The 4000 is more efficent. If you wind out 3rd gear in racing from a roll, I'd take the 4000's efficency over the 4400's shift extension. I went with the 4200 because from a roll it is more efficent than a 4400 and has nearly the same shift extension.
-Not much difference between the 2 at the track
For Pure track use, I'd take the 4400. The extra stall and midrange should be worth at least .05.
-Both use same internals
Pretty much. I'm not sure if the 4000 uses the same pump with a blade angle adjustment or different pump.
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The PT 4000 I had in my SS had crazy shift extension. Somewhere like 5800-5900. Never had a converter that was better from a roll.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
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2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
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From: Dyess AFB, TX
Originally Posted by Ragtop 99
The 4000 is more efficent. If you wind out 3rd gear in racing from a roll, I'd take the 4000's efficency over the 4400's shift extension. I went with the 4200 because from a roll it is more efficent than a 4400 and has nearly the same shift extension.
If I take the horsepower of my engine at the PT4400's shift extension (5900) I end up with 390 rwhp. So with my calculations, the PT4400 would be better from a roll for me because my engine would never drop below 390 rwhp, as opposed to 378 rwhp w/ the PT4000. Is this an accurate measure?
Originally Posted by LS1 BU
I get 5900 shift extension with my pt4400. I have heads and cam. I wish I could 60ft 1.50. Camaro Cain makes my car seem slow.
What type of suspension setup are you running? Should have brought the car down to Thunder 
Efficency comes in after the converter has come off shift extension. I'm not sure where you got your numbers from, so I didn't understand your example.
Yank does not have a comparison of the 4000 and 4400 available but take a look at the SY 3500 & SY 4000 comparison as an example.
http://www.converter.cc/super_yank_dyno_overlay.htm
I think the YTP 4000 vs 4400 will be a little closer but as you can see the higher stall gives a little more pull in the upper midrange but the advantage disappears at ~4600 rpm before the shift extension ends (~4800) and from then on there is a couple percent advantage. This pattern will be similar on the 4000 vs 4400 but the curves shift to the right a bit since they have longer extensions.
Yank does not have a comparison of the 4000 and 4400 available but take a look at the SY 3500 & SY 4000 comparison as an example.
http://www.converter.cc/super_yank_dyno_overlay.htm
I think the YTP 4000 vs 4400 will be a little closer but as you can see the higher stall gives a little more pull in the upper midrange but the advantage disappears at ~4600 rpm before the shift extension ends (~4800) and from then on there is a couple percent advantage. This pattern will be similar on the 4000 vs 4400 but the curves shift to the right a bit since they have longer extensions.
I didn't know that the Thunder race was on Sunday. I found out last minute. I couldn't see bring my car down for Fri and Sat only. My brother had to work on Monday so we couldn't stay for the race on Sunday. I run Hal coilovers on the front with moroso trick springs on the rear and a 50/50 drag shock. I also have a 1 and 3/8 rear sway bar in the rear. Front sway bar is off.
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From: Dyess AFB, TX
Originally Posted by Ragtop 99
Efficency comes in after the converter has come off shift extension. I'm not sure where you got your numbers from, so I didn't understand your example.
Yank does not have a comparison of the 4000 and 4400 available but take a look at the SY 3500 & SY 4000 comparison as an example.
http://www.converter.cc/super_yank_dyno_overlay.htm
I think the YTP 4000 vs 4400 will be a little closer but as you can see the higher stall gives a little more pull in the upper midrange but the advantage disappears at ~4600 rpm before the shift extension ends (~4800) and from then on there is a couple percent advantage. This pattern will be similar on the 4000 vs 4400 but the curves shift to the right a bit since they have longer extensions.
Yank does not have a comparison of the 4000 and 4400 available but take a look at the SY 3500 & SY 4000 comparison as an example.
http://www.converter.cc/super_yank_dyno_overlay.htm
I think the YTP 4000 vs 4400 will be a little closer but as you can see the higher stall gives a little more pull in the upper midrange but the advantage disappears at ~4600 rpm before the shift extension ends (~4800) and from then on there is a couple percent advantage. This pattern will be similar on the 4000 vs 4400 but the curves shift to the right a bit since they have longer extensions.
But screw it, I'll just go for a 4200 and be done with it
