SCREAMIN

Must have been a year and a half ago I purchased my competition TCI 3600 from ws6stor.com and for some reason its in my head that I have a 2.7 STR but I wanted to find out for sure.

In the past for my LT1 I purchased a super street fighter TCI 3500 and it seemed to have hit harder off the line. I believe that one to have a 2.5 STR and when I would let off it would sqeak the serpentine belt (may not have anything to do with the converter but did'nt do it before the install)

Both cars were/are bolt on cars with headers and such. No aftermarket heads/cam. I know for a fact the LS1 has quite a bit more power (duh) but the LT1 60 ft I could get 1.70 - 1.72 consistantly, with the LS1 I can barely get 1.75s dead hooking. Was wondering if the str was the difference or if I was something else.

BTW: I looked on a few speedshop sites and Vigilante doesnt seem to release info on STR.

performabuilt

iTrader: (25)

Without a machine to test it or knowing exactly what parts were used to make it measuring or calculating STR of a converter would be close to impossible

RedHot04

iTrader: (1)

1. Better call TCI, see if they even Dyno their units???

2. http://www.converter.com/torqueratio.htm

Quote from the linky: "In our tests we have never seen an STR over 2.55."
this is what they told me on the phone also, 2.55 is the STR on the Vig.

darrensls1

It occurs to me that we have a pretty similair mod list but you have ls6 intake and a 3.42 gears inside a 12 bolt. With my off the shelf SSF3500 (2.5 STR) I pull consistent 1.70-1.72 60's on normal weather days. In cool air I hit 1.65-1.69 60's. Even on hot and humid days I still hit 1.75-1.78 60's.

This is all dead hooking on M/T street radials and at 900 feet above sea level BTW. So if that's what I hit on 3.23's and a 2.5 STR then I can't see how your STR could be 2.7 when you're hitting worse 60's and with better gears. In fact, I wouldn't be surprised if your converter has a 2.2 STR based on your results.

But the only way to know for sure is to remove it from the vehicle and have it tested by someone with the proper equipment. I know Yank can verify STR's. I'm not sure about TCI but you could always call them and ask Kevin. Personally I would just pull it out and sell it. Then you can replace it with a Yank SS4000 that has a 2.6 STR

12secSS

iTrader: (30)

Apply a set amount of torque (or HP) to the input side of the converter, while on a converter dyno. On the output side of the converter, hold the (trans) input shaft with a suitable brake. Monitor your input torque value, your output torque value, as well as input (engine) RPM. When input RPM reaches the rated stall speed, record the input/output torque values. Divide the output torque by the input torque, this gives you the STR. No other way of doing it.

02NBMFormula

iTrader: (6)

just email or call TCI. as for the 2.7str, i doubt it.