Stall torque ratio??
Thread Starter
Racer
Joined: Mar 2002
Posts: 255
Likes: 0
From: Portland OR
Stall torque ratio??
OK, I've been reading up on converters to see what would best suits me and this weekend a forum member has offered to let me see what the Vig 2800 feels like. I now think that I want a lower str converter for better power in the higher rpm range and so that I don't go through my emt's in a week. I just need to know the str's on the Vig 2800 and the Yank 3000. Can't find them on their sites. Also, why do most people praise the Transgo shift kit while both these manufacturers state they don't recommend them because of the stress they put on the transmission? :cheers:
Instructor
Joined: Aug 2001
Posts: 192
Likes: 0
From: Virginia Chesapeak
Re: Stall torque ratio?? (ericg320)
Yank makes two 3000 stall converters one with a 1.86 STR and one with a 2.2 STR. The one with the lower STR will be better with street tires. The Vig 2800 has a 2.5 STR I have also heard some people say it has a 2.2 STR. Check the Yank Converters web site under F.A.Q. it explains why Yank and other converter makers do not recommend shift kits. Some people like the very firm shifts that a shift kit delivers and are willing to take the chance of shorter tranny life. However some of the guys that recommend shift kits have race built trannys than can handle the higher line pressures you get with a shift kit without tranny damage. In my case I still have my stock tranny so I had my shifts firmed up with LS1 Edit. If I ever install a race built tranny I might consider using a shift kit.
98 A4
Donaldson Blackwing
Cartek Stage 2 Heads
Cartek M Cam
LS6 Intake
TPIS Headers
Underdrive Pulley
Comp Push Rods
Rev 1116 Valve Springs
Borla Exhaust
172 t.stat
ST3500
3.73 Gears
B&M Trans Cooler
Hurst Line Lock
[Modified by MC98, 9:01 PM 2/7/2003]
98 A4
Donaldson Blackwing
Cartek Stage 2 Heads
Cartek M Cam
LS6 Intake
TPIS Headers
Underdrive Pulley
Comp Push Rods
Rev 1116 Valve Springs
Borla Exhaust
172 t.stat
ST3500
3.73 Gears
B&M Trans Cooler
Hurst Line Lock
[Modified by MC98, 9:01 PM 2/7/2003]
Safety Car
Joined: Oct 2001
Posts: 4,026
Likes: 0
From: Renaissance Festival TAZ the Wolfdog (R.I.P.)
Re: Stall torque ratio?? (ericg320)
B&M doesn't recommend the shift kit as a disclaimer for warranty reasons. The 4L-60E is known to be weak - even GM adds the Torque Mgmt to increase longevity. Some of us are willing to push the limit for a nice, firm, crisp shift.
[Modified by Steve02C5, 6:54 PM 2/7/2003]
[Modified by Steve02C5, 6:54 PM 2/7/2003]
Instructor
Joined: Dec 2001
Posts: 182
Likes: 0
From: TARZANA CA
Re: Stall torque ratio?? (omattitude)
Check this out for STR discussion http://forums.corvetteforum.com/zerothread?id=357065
:steering:
:steering:
Thread Starter
Racer
Joined: Mar 2002
Posts: 255
Likes: 0
From: Portland OR
Re: Stall torque ratio?? (MC TORCH RED)
No, not going to run it until TC and is installed. I'm guessing with present mods and 3.15's I'd run between 12.6 and 12.8 in good track conditions. With TC lower 12's. :cheers:
Le Mans Master
Joined: Aug 2000
Posts: 5,294
Likes: 2
From: Suffolk, Long Island NY
Re: Stall torque ratio?? (MC TORCH RED)
eric with the mods you have, what are you running,been to track yet, i'm thinking ls6 intake and headers.. :chevy
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Pro
Joined: Oct 2000
Posts: 732
Likes: 1
From: Sierra Vista, Arizona
Re: Stall torque ratio?? (MC98)
Yank makes two 3000 stall converters one with a 1.86 STR and one with a 2.2 STR. The one with the lower STR will be better with street tires.
"YANK C-5 3000 (258mm, 3000 stall, 2.0 STR) $795 The most popular of the C-5 converters, the Yank C-5 3000 gives the Corvette a much stronger launch off the line than stock, plus it will dramatically improve passing times on the road. With proper traction, the Yank C-5 3000 will drop 1/4 mile times at least 5 tenths of a second".
Hope this helps. I am also shopping for a Yank 3000, will probally order one tomorrow.
Thread Starter
Racer
Joined: Mar 2002
Posts: 255
Likes: 0
From: Portland OR
Re: Stall torque ratio?? (Buckmaster)
Thanks, for the info. I've narrowed it down to 2 converters now. Either the Vig 2600 with 2.5str or the Yank 3000 with the 1.86. I'm leaning towards the Yank due to the increased torque through the mid ranged rpm's and the fact that I'm going to stick with street tires.
Pro
Joined: Oct 2000
Posts: 732
Likes: 1
From: Sierra Vista, Arizona
Re: Stall torque ratio?? (Buckmaster)
Thanks Buckmaster. My mind is definitely made up. I will order a Yank 3000 tomorrow. How was the Yank 3000 for normal street operations, was it "loose" or almost like stock?
The Yank 3000 is not only WILD off-the-line but it also provides torque through the mid range of rpm's. It really is a great TC IMO.
Le Mans Master
Joined: Nov 2001
Posts: 7,033
Likes: 0
From: Cincinnati Ohio
Re: Stall torque ratio?? (ericg320)
What do TC manufacturers recommend for mild perf MODs like yours and mine and mainly a street ride? Sub 2.0 STR for a mild MOD Vette? And is their a balance between the STR and stall rpm? Like a PT2800 with a 2.2 STR vs. a Yank3000 with a 2.0 STR??? :confused: :confused: :confused:
Sorry, I am as confused as you and I need to make the same decision by Spring for my 3.42 install. :(
Sorry, I am as confused as you and I need to make the same decision by Spring for my 3.42 install. :(
Thread Starter
Racer
Joined: Mar 2002
Posts: 255
Likes: 0
From: Portland OR
Re: Stall torque ratio?? (batsallover)
From what I can tell the Yank 3000 with the 1.86 str is going to be a better street tire converter compared to the Yank 3000 with 2.0 str. The 2.0 is going to give a bigger blast off the line but thats exactly what I'm not looking for. My tires are already spinning. The 1.86 str will give an awesome launch with out over doing it, while also increasing torque during mid and higher rpms over the 2.0 and drastically more than the Vig 2.5. I'm a layman when it comes to this subject but these are the facts as far as I can tell. Correct me if I'm misinformed.
Safety Car
Joined: Aug 2000
Posts: 4,154
Likes: 1
From: Murphy TX
Cruise-In II Veteran
Re: Stall torque ratio?? (ericg320)
I think Eric has it about right. The trade off is typically how torque multiplication is distributed through the RPM range. Higher STR, you will see more multiplication down low but it will diminish more rapidly and be done sooner. Lower STR, you'll see less multiplication down low but it will diminish less rapidly and last longer. Low STR is nice for low gear fans. ;) First overall is very low if you already changed rears, factor in the converter's multiplication as well and you see why it can seem nearly impossible to hook.
