Sy 4000
Thread Starter
Teching In
Joined: Apr 2004
Posts: 17
Likes: 0
From: Irving
Sy 4000 What do you guys think of the SY 4000 from Yank. I have been looking for a converter for a while, now Im about to get a good deal from a friend. I just wanted to know what are the positives and negatives compared to the PT series. My mods on the car are: Hooker Lts, H-pipe, ASP Pulley, Lid & K&N. (Keep in mind that I daily drive my car about 100-150 miles per week. 
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TECH Enthusiast
iTrader: (10)
Joined: Aug 2002
Posts: 720
Likes: 1
From: Arlington, TX Congestion City
Man just step up to the 4000 the SY series doesn't hit that hard. You'll like it.
Not sure if you know Wade but here ya go:
http://www.ls1.com/forums/showthread...hreadid=502066
Not sure if you know Wade but here ya go:
http://www.ls1.com/forums/showthread...hreadid=502066
Launching!
Joined: Aug 2002
Posts: 264
Likes: 0
From: Milwaukee
I had an SY3500. It actually hits softer than the stock convertor. With the mods listed and a random tech cat and y-pipe I ran a 12.9 @ 106.5 with a 1.9 60'. The car was very streetable. I took it from Pennsylvania to Florida and Kentucky a number of times with no problems.
TECH Addict
Joined: Sep 2003
Posts: 2,065
Likes: 0
From: Atlanta, GA
you have to pick a verter that is appropriate for your dyno powerband.
ie the tci ssf 3500 can shift at 6200 and drop back to 4700 (SE).
This is too small for my dyno. So i shift at 6600 and it drops to 5000 rpm (SE).
Now on the strip for my powerband. I'd ideally want a 4000-4400 verter so
when i shift, the next gear hits at 6000rpm..
I am guilty of the picked a verter 500 rpm's too small for my car.
Oh well. I can still run 12.0/high 11's but its harder than say with a nice 4000 or 4400 stall.
Gotta pick the verter AFTER you have the engine power band defined.
The tci ssf 3500 is not big enough for a cam only car and defo not big enough for heads/cam. it is a nice verter no less.
ie the tci ssf 3500 can shift at 6200 and drop back to 4700 (SE).
This is too small for my dyno. So i shift at 6600 and it drops to 5000 rpm (SE).
Now on the strip for my powerband. I'd ideally want a 4000-4400 verter so
when i shift, the next gear hits at 6000rpm..
I am guilty of the picked a verter 500 rpm's too small for my car.
Oh well. I can still run 12.0/high 11's but its harder than say with a nice 4000 or 4400 stall.
Gotta pick the verter AFTER you have the engine power band defined.
The tci ssf 3500 is not big enough for a cam only car and defo not big enough for heads/cam. it is a nice verter no less.
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Sam, I agree with your general theory on matching the converter to the powerband.
The real issue for drag racing is where peak torque occurs and how flat the torque curve is. Cut the 1.5x 60' and the rest will come. Shift extension helps but 60' is more important. Ask anyone with a SY 3500 who has taken it to the track and raced against a Vig 2800 or TCI 3500. You don't make it up on the top end.
With an LS1 or LS6 intake, the optimal stall speed is 4000 - 4400. This has been proven to be the case on stock cammed cars and on cars with cams going into the 230s on intake duration. Until peak torque moves up to 5200 rpm and higher (a possibility with the new intake manifolds and 24x cams), the 4000 - 4400 stall speed range will be the best choice for performance.
The real issue for drag racing is where peak torque occurs and how flat the torque curve is. Cut the 1.5x 60' and the rest will come. Shift extension helps but 60' is more important. Ask anyone with a SY 3500 who has taken it to the track and raced against a Vig 2800 or TCI 3500. You don't make it up on the top end.
With an LS1 or LS6 intake, the optimal stall speed is 4000 - 4400. This has been proven to be the case on stock cammed cars and on cars with cams going into the 230s on intake duration. Until peak torque moves up to 5200 rpm and higher (a possibility with the new intake manifolds and 24x cams), the 4000 - 4400 stall speed range will be the best choice for performance.
the series of the convertor is like its personality. it depends on what you need out of it. if you want to run et streets or drags, and are going for every last hundredth out of the starting block, then the PT is the only way to go. if you want to hook on the street or run just radials, then the SY will do you well. dont mix up the two because you will have a bad combo. an SY on slicks will be lazy.
On The Tree
Joined: Jul 2002
Posts: 179
Likes: 0
From: Texas
My buddy had a 00 z with all the bolt-ons except LS6 intake. He also had a F1 cam 3.73s and the SY4000. If you are getting the converter from Wade at RPM then that is my buddies SY4000. I was actually thinking of getting that converter. But then I went with a TCS 4400 and upgraded it to a phoenix line with a 2.7str. On the street in still roasted the tires and pulled hard. The Sy also has good top end due to it’s good efficiency. It is a good converter for the street no doubt, but it is not going to be anything like a hard hitting 4400 
I have the Yank SY3500 with my 323's.
the 1.7 STR is very easy on shifts and i am running high 12's in the 1/4. Very streetable vert if you ask me. I am pleased.
My car also has 140K on it.
the 1.7 STR is very easy on shifts and i am running high 12's in the 1/4. Very streetable vert if you ask me. I am pleased.
My car also has 140K on it.
