can someone please explain why the SY3500 STR is rated at 1.6, and what does this mean? I noticed all the other ones are like 2.5

 

The SY3500 was designed mainly as a street converter. The 1.61 STR means it will multiply your engines torque 1.61 times. The low 1.6 STR makes this converter easier to launch on the street with street tires or DRs. As opposed to a harder hitting converter with a 2.5 STR.

 

How low do you think i can drom my 60' with the SY3500 and what gains et wise?

Thanks

 

Assuming you will be running at least DRs I would expect 1.7
60 ft. times. You will probabily drop your ET .5 or maybe a little better.

 

with 3.73s and nittos you can get into the high 1.6's with that converter if you car isn't a pig. As stated above, it's really an ideal street converter. If you are looking for solid drag racing capablity and have good tires, more STR will get you another .1 in the 60'.

 

You can also order it from Yank with a 1.86 STR

 

True, but I wouldn't.
You loose the upper midrange and some efficency in that configuration.

 

I have a SY3500 and 3.73 combo.

The best 60 foot I got was a 1.881. I'm still working on improving but haven't figured it out yet. For the track, if i can't figure out how to 60 better, a big shot of nitrous will take care of it for me.

I shaved about .5 seconds from my 1/4 mile time.

In my opinion, this combo is ideal for the street.

 

It is a KILLER combo for the street. While the other dude is spinning his wheels off your accelerating and leaving him in the dust.
That verter and some drag radials is just DEADLY on the street.

Good luck. The 3.73's and that verter have time and time again been said to be the "sleepers dream".

 

Joel,
My 99 SS had a SY-3500 with a 1.86 STR, 3.23's

I was MORE than happy with it, on the street

It pulled a 1.72 60 ft on Nitto's

Of course, now-a-days I'd be pissed with a 1.72