nitr0racing21

iTrader: (5)

Can someone give me a idea of which STR ratio I will need I am trying to get a tight converter but as of yet haven't had any luck thanks.

silver30th

iTrader: (13)

check out the sticky up top..helped me a lot

twitchtwice

iTrader: (12)

my best suggestion is to call a company like circle d and tell them exactly how you want the car to behave and what mods you have/will have and they will spec you out a converter.

kinglt-1

iTrader: (26)

If you want a "tight" stall look at the fti 3600... I think it has either a 1.6 or 1.8 str. The higher you go on the str rating the "looser" the converter. I went with a fti 3800 built for spray. Im pretty sure it has a 2.1 str, wich imo is a happy medium per say. Greg told me with 3.73 gears it should only need another 200-300 rpm over stock to get the car movin part throttle. He also said the 3800 is worth another 1-2 tenths over his 3600, with hardly any noticeable difference in drivability. I can not offer you any more info from that since I dont have it installed yet... should have it installed next month, I hope anyways lol.

01ssreda4

iTrader: (96)

It's the opposite. Look at Yanks SS line, known for being tight around town and they have like a 2.4str. Tighter around town and less efficient up top is the trade off.

Yank

iTrader: (181)

Correct! the higher the STR the better the low speed driving feel will be.

The SS3600 is the top choice for the F-body
give us a call.

kinglt-1

iTrader: (26)

So what you guys are saying is the higher str will give you better low speed driving, but be less efficient up top? When you say less efficient up top does that mean tq multiplication falls off faster after stall speed rating? Thanks for clearing this up!

01ssreda4

iTrader: (96)

Yes this is exactly correct. Higher str multiplies more torque but for less time, lower str multiplies less total but for an extended rpm period. Also understand that the most efficient converter is, well, the stock one. In trade off for the efficiency in higher rpms you give up a lot out of the hole and through shift extensions, where stock type converters tend to drop a lot of rpms. It's never a win/win but merely a compromise of what you want and what you are willing to give up.

kinglt-1

iTrader: (26)

Ok makes sense... I think what had me confused was in the sticky where performabuilt posted this quote:

"*Lower stall torque ratio is gentler on the tires at the initial launch, but it will pull harder for the remaining 1,305 ft. of the 1/4 mile. Less races will be lost at the starting line from excessive wheelspin.
Lower stall torque ratio will be more efficient and transmit more torque and horsepower to the tires. This translates into lower ETs and higher trap speeds!"

The part where it says a lower stall tq ratio is gentler on the tires, I thought that meant it was a tighter converter(not sure why lol)... but I see now thats not the case. Thanks again for clearing that up 01ssreda4!!!

01ssreda4

iTrader: (96)

converters are like black magic anyways right??

stumprrp

iTrader: (2)

this is interesting because when i talked to Greg at FTI it was the opposite of what you guys are saying. we were disucssing a very high multiplying converter for a track car and he said due to the high STR the converter would be a bit loose on the street.

regardless, my old yank ss3600 drove perfect around town. 1.69 at the track with 0 suspension mods and bald ET streets.

01ssreda4

iTrader: (96)

Radials or bias ply? Reason I ask is bc with stock Bilstein suspension my car has been a bitch to hook with DRs. Its finicky as hell trying to get the weight to transfer to the back and control the initial hit of power with a converter.

stumprrp

iTrader: (2)

car had 255 x 50 radials, on about 18 PSI. honestly it always hooked and did consistant 1.70s i got lucky one pass on a cool night and did 1.69. shift extention was 4900 or 5000 shifting at 6500 i believe

Yank

iTrader: (181)

Here is some info from our site

http://www.converter.cc/tech_talk/

FTI Converters

Not trying to start a war but!!!!I have driven a car with each and everyone of our converter designs in them. If you read the link about str on yanks website it might help everyone understand why the lower str is more suited for effiecieny. http://www.converter.cc/tech_talk/
The higher the str the less efficient the converter will be and the harder it will hit the tires. Why because it is multiplying more torque at that giving moment of maximum stall. They even discuss a competiters str of 2.5 and a 1.8 and put it on there graph. Please look at this and then read the following caption.

Greg