Maybe someone here can answere this. Why is it that on Yank's
website, the dyno graphs with Yank converters show higher
readings than the stock converter from 5000-6000rpms, yet
most people who post about it seem to lose power in this rpm
range? Are they just locking all of their converters on the dyno
to make them read higher?
I asked this on LS1.com, but no one seems to be able to answere
the question. I just got responses about not worrying about the
numbers and such. I understand what wins the race. I am just
curious what they are doing to show better results that anyone
else seems to be able to do.

 

i read those graphs as them saying that their converters are more efficient than the stock converters in that range. i picked yank because of the dyno charts they have, the converter i picked has a higher stall than stock with a high STR but somehow manages to pick up 10rwhp or so in the upper rpms too.

where do you get "most people who post seem to lose power in this rpm"?

 

i just installed my 3800ss from yank, before it made 321to the wheels, after it made 298 to the wheels, then installed a slp y pipe 303 to the wheels, before it went 13.5 at 102, after it went 13.1 at 103 the track i run at is over 2700 feet(LACR) the graphs show a big improvement in the low end and a loss in the top end, average power is up and the mph shows this
Todd

 

What I meant by most people was most of the people I have seen post their results on this forum. You are the first I have seen get the same results as Yank. I am curious why most people do not see these results and if it is because they lock their converters on the dyno to show higher readings. I will
be in the market for a new converter soon and want to have as much knowledge about them as possible before I make a decision.

 

What yank converter dyno are you looking at?

If it were me I would pass on the Yank and go with a TCI. With TCI you get good performance and good customer support/service and a company that will stand behind their warranty.

For more info read through the post at the like below.

https://ls1tech.com/forums/automatic-transmission/133544-yank-4-me-anything-else.html

John

 

I have no idea where those dyno results came from, I know on a stock car you arent going to loose that much with a converter. Those runs were made from a dead stop in 3rd gear and I have never tried that so who knows. If you put 450rwhp to one its a different story it seems.

My ST3500 lost 20rwhp and the PT4200 I have now is loosing about 35rwhp on the dyno and the Vig3200 I had in my C5 lost around 15rwhp. Here are 3 dyno graphs, 1st it with my old procharged camaro locked and unlocked (you can see the rpm is higher on the green lines with the unlocked converter). 2nd is My old C5 locked and unlocked, once again you can see how the dynojet shows higher engine rpm/lower rwhp on the unlocked convrerter. And the 3rd is the car I have now with the M6/3.42 10 bolt compared to a TH350/PT4200 and a 9" (with lightened axles/spool) 3.70. One again the RPM is higher on the dyojet and there is quite a loss, I also added another pound of boost with the auto so I would probably make 480rwhp but the 9" is sucking up some power. 97mph in the 1/8 for a 3550lb car is around 440rwhp so the numbers are pretty close.

And yes I dont care about the dyno numbers, thats not the point of using a high stall converter. Yank makes an OK product but I'm still trying to figure out how they GAINED rwhp with an unlocked high stall converter and the RPM on the dynojet stayed the same

 

you could just throw a switch at 5000rpm and lockup the verter if you are for dyno queen #'s but i don't know if the converter would last that long.

yank makes good stuff, by beef is that both TBYRNE nor I have been able to get a response its been like 3 weeks since i left a message,and even tbyrne said they couldn't get throw and didn't get back to me.

That says something bout their support system. I had cash i was ready to buy, no bull**** talking. (in my case i needed the 4l60E crossmember torque arm relocation setup).

I think its lousy that a company won't backup their retailers, and that i can't BUY a product. Makes you wonder whats gonna happen when you have to return a defective product huh?

Thats my beef. If yank would like to come out of the woodwork and sell me something i'll take my beef back. But i coulda used the part a while ago.

 

Dont worry, the support after you get it is just as frustrating but then you will be so happy to get it it wont matter

Believe it or not there are torque converter/trans companies out there that do answer e-mails and phone calls and ship products on a timely basis..

 

That testing was done by a shop in Florida 2+ years ago. Mike lent them his Camaro SS and sent them a bunch of converters and they did all the swaps and dyno testing and gave Yank the data. The pulls were done in third gear in order to get good low rpm test results and use a 1:1 ratio on the dyno. All of the pulls were unlocked since that is the way most people race and that shows where the converter is working. When you see the converter above stock, it is producing more power.

Those of you reporting bad efficency (i.e. low dyno results) need to be sure that the dyno is same day, back to back locked versus unlocked. I have done that. Only a 13 hp loss on my YTP 4200. I haven't tested the SS & PS line so I don't know how efficent they are, but I expect them to be a little less efficent than the YTP line.

 

Two of those charts are back to back locked and unlocked..

I would test the locked/unlocked on the lockup TH350/PT4200 that I have but it doesnt work

There was just another guy that lost 34 through a PT4400 with a cam only car, so I dunno how some people see 12 rwhp and some see 30+

All that matters to me is the 60' anyhow..

 

Well I dunno what kind of customer service you have gotten from Yank but when I blew my tranny and had it rebuilt a piece of metal got stuck up in the stalls clutch. Yank rebuilt the whole thing for me for the cost of shipping! That was enough for me to buy from them again.

 

get a multi-disc vig....I only lost 3hp locked vs unlocked @ MTI w/my heads and cam package. and Yanks are 1000 ish...the multidisc vig is 1000 ish...so it's not like ur spending more.

 

Yea it seems the whole hp#'s with a verter is as clear as mud!! I posted a subject on this awhile back and got 0 responce. I prolly will never figure out who has a good efficent verter!! Oh well I want some LT's anyways

 

tci 3500 or a midwest 3400/3600

cheap, quality, performs

 

I have not dynoed my car since I had the converter installed. It is a YANK 3200 w/ a 2.8 STR, I expected to lose some MPH at the track but did not. I was pleased with that & I assume that my converter is pretty efficient and I wouldn't see much loss on the dyno.?.

 

Two years ago,I dynoed at 299 rwhp/320ft lbs.
Since then, I added a Yank SS3600 and dynoed at 278 (unlocked) rwhp in Dec.
With the converter,traction in first was marginal at best. The rear wheels would break free intermittenly right up to the 1-2 shift. Car was definately faster than with the stock converter.
SLP LTs, y-pipe, cats and LSI Edit kicked it up to 302 rwhp and 329 ft lbs. Traction in first is now hopeless. And it pulls great at any speed.
At first, I was concerned as hell over the 'low' dyno but, after reading some of these posts, I feel a lot better.

 

I would have to say you will gain a little more up top HP due to the aftermarket converters seeming to way a little less than stock. Could just be me, but my stock converter filled w/ fluid was several pounds lighter than my vig3000 filled with fluid..
the weight savings would definitely help.