Gears & Axles - Best TC from a roll

AlienDroid

04-11-2002, 03:03 AM

I'm looking for the best TC for everything above and including the 1st-2nd shift. In stock the rpms drop too low after each shift and when on the freeway there some speeds that lag horribly when you floor it.

Looking at some graphs

http://www.converter.cc/super_yank_3500_dyno.htm
http://www.converter.cc/super_yank_4000_dyno.htm

It seems that the 4000 has a larger increase in power right after any shift then the 3500, however the 3500 has much better top end.

From this view alone which one would be better for this application.

Also for anyone who has driven a car with the SY4000? Is it useable as an everyday car?

thanks

WILWAXU

04-11-2002, 07:58 AM

TP-4400 !

Super Yanks are great converters... but the Thruster Pro series ROCKS from a roll.

A TP-4400 with 3.73 is IMO the quickest "from a roll" (and anywhere else) converter out there.

Ragtop 99

04-11-2002, 08:02 AM

Take a YTP 4400 and drop the stall to 4200 or 4000 will probably produce the best converter from a roll.

If you are changing from a stock converter, you should drive someone's car before going to a 4000 stall. Test either a 4000/3.73 or 3500/3.23 car (not quite as loose, but close) before buying. The SY 3500 and 3.73s is a very streetable combo for most people.

AlienDroid

04-11-2002, 08:51 AM

Do you know why the TP 4400 is best from a roll?

Why is it better then the SY-3500 and SY-4000?

On the graph I see that the TP 4400 has just over 300 hp at 3,500 rpm. The SY-3500 would have maybe 10 or 15hp under 300hp at 3,500rpm but the SY-3500 has hp gain on the entire curve Even in the high end. So even with more high end hp the 3500 is not as fast?

How much of a difference are we talking about? I want my car to be streetable. How high will I have to rev before my car starts moving normally with the 4400?

[ April 11, 2002, 08:58 AM: Message edited by: AlienDroid ]

Ragtop 99

04-11-2002, 10:17 AM

It's the big midrange gain, especially on the upshifts that create the power from a roll. The top end still needs to be there, but the smaller converters do not have the big gain on the 2-3 upshift like a 4000 stall has.

I use 2600 - 2900 rpm in typical moderate traffic around town before lock-up, 3300 to get moving quickly. you can still do parking lot manuevers at low rpms (e.g. 1000 - 1200).

A SY 3500 will use around 400 rpm less on average in town than the YTP 4200. If you've never driven a car with a converter, it would be as big as I would go for a daily driver. The car will feel much stronger from a roll (and off the line).

xxxhp

04-11-2002, 11:01 AM

so is the TP4400 the best converter ever from a roll? I see Yank also has ULTRA THRUSTER & ULTRA YANK converters. Any one tried these?

Besides, Yank website says that TP4400 has 2.7 STR. Would decreasing the STR to say 2.2 increase its top end pull even more?

Pro Stock John

04-11-2002, 11:07 AM

I consider any 4400-4600 stuff to be race stuff.

I think that they are too loose for someone who mostly drives on the highway.

I would say 4000 stall max.

Patrick G

04-11-2002, 11:12 AM

The YPT4400 is definitely the best converter from a roll. I've owned most of the good ones including the SY3500, SY4000, SY4200E, and PT4400. The Pro Thruster blows the other "high efficiency" converters in the weeds from a roll. The propietary stator that Yank uses is the key. The special stator keeps the STR high, but also keeps the efficiency on the top end incredible.

The only downside is the looseness around town. If you can live with it, you will be hard to pass.

The Ultra Thrusters are too loose for anything less than a 8000 rpm motor when racing from a roll.

AlienDroid

04-11-2002, 01:22 PM

Ragtop 99, what about the 1st-2nd upshift, is it different from the 2nd-3rd one.

So which one is faster from a roll. The SY 3500 or SY 4000? Is it significant?

Higher stall converters tend to be smaller and weigh less also right?

[ April 11, 2002, 01:24 PM: Message edited by: AlienDroid ]

11 Bravo

04-11-2002, 07:15 PM

I talked to Mike at Yank awhile back, and asked him what the best converter would be on a bolt on LS1 w/ 3.73's when racing from a roll. He said the TP4400. That's good enough for me, that will be my next converter.

Ragtop 99

04-11-2002, 07:47 PM

<blockquote>quote:<hr />Originally posted by AlienDroid:
Ragtop 99, what about the 1st-2nd upshift, is it different from the 2nd-3rd one.
<hr /></blockquote>The gear drop on the 2-3 is less than the 1-2, so even w/o a high stall converter, your rpms would not drop as much on the 2-3.

 <blockquote>quote:<hr />
So which one is faster from a roll. The SY 3500 or SY 4000? Is it significant?
<hr /></blockquote>SY 4000. Depends on the speed you start from. The closer you are to the upshift (and therefore lower in the rpms) the more the higher stall benefits your power.

 <blockquote>quote:<hr />
Higher stall converters tend to be smaller and weigh less also right?
<hr /></blockquote>True, but it is not a linear relationship.

Ragtop 99

04-12-2002, 12:24 AM

<blockquote>quote:<hr />Originally posted by xxxhp:

Besides, Yank website says that TP4400 has 2.7 STR. Would decreasing the STR to say 2.2 increase its top end pull even more?<hr /></blockquote>I discussed doing that with Mike and we decided that if we were succesful in finding the right stator, the result would be a 4400 converter that felt like a 4800 - 5000 stall from a looseness standpoint.

WILWAXU

04-13-2002, 12:05 AM

<blockquote>quote:<hr />Originally posted by xxxhp:
...I see Yank also has ULTRA THRUSTER & ULTRA YANK converters. Any one tried these?
<hr /></blockquote>I have a UT-4600.. and for a Stock Internals car.. it's to much. Sure, my car runs good with the UT.. but I bet it will be faster with a TP-4400.

The UT-4600 would be a GREAT converter for a Heads and Cam car or upgraded valvetrain willing to "wring" it out to 7000rpm on a pass.

<blockquote>quote:<hr />Originally posted by Patrick G:
...The Ultra Thrusters are too loose for anything less than a 8000 rpm motor when racing from a roll.<hr /></blockquote>I completely agree!

[ April 12, 2002, 12:07 PM: Message edited by: WILWAXU ]