How high do you spin the motor, and would you do it any differently with a 4000?

 

My limiter is at 6900 i think. Honestly, right now the only thing I want to change is maybe go up to a pt4400 converter and a set of 3.90 gears. Go big or go home, skip the I wish I went higher regrets!

 

True but I don't want to wind up having too much converter being on a stock cam and rear/gears for an unknown amount of time. Any idea how the ss4000 would perform on stock rev limiter with 3.23 rear?

 

No but i've been told the SS4000 is WAY more tame than the PT4000 so I think the SS4000 would be a good choice if you didn't want that aggressive of a converter. Kind of a best of both worlds converter.

 

But in theory that only gives me ~2k rpms of usable power on stock rev limiter... guess I need to drive someones 4000 stall around the block a few times.

 

go for a ride in a car with a higher stall converter, you'll never look back at anything under a 4000 again, trust me.

 

Well this will be my new goal, thank you gillbot and if anyone decides to respond with anything please feel free.

 

Does anyone else have any comments. I am in the same position as Alt wondering if the ss4000 would be too much.

 

I love my SS4000, but that doesn't make it right for every application.
My advice is to select the one that meets your long-term needs or wait until you determine what those are.
The guys at Yank are quite sharp on converter selection, make a clear request and get a clear answer.

 

The 4k stall, does that require tuning? I know you can get away with the 3600, but I'm not so sure about the 4000.

 

Okay so now its even, where do I go from here?

 

lol...go big or go home

 

I guess *shrug* though I did have a shop tell me that a 3200 vig would be a better stall to shoot for. I guess everyone has their own opinion huh?

 

I'll be getting my 4k fuddle delivered here soon. I will also be putting a cam in so that is why I went with the 4k

 

I say go with the 4000. I have a 3800 (and have been told it's probably a 4000) with 3.23s and love it. I can pull 1.6X 60' with manifolds and OEM long block. That's now ground breaking or anything but I don't think thost results are too bad on some DRs. My brother had a SS4000 and loved it. He was able to pull 1.6X 60's too with 3.73s. He said he liked how loose mine was a little more because of the 3.23s and when he went down to 3.42s like it a little more.

SS4000 ;D

 

4k here and basically stock. Its much better than the 3k stall i had. You might need some tuning though so keep that in mind. I did all my tuning so it wasn't so bad.

 

SS 4000 for the win. Get it done right the first time. It took me 3 stalls before I got it right. Don't go through that.

 

James is correct, it depends what you're looking for.

Are you looking for the fastest times on the track with ET streets? Go high stall.

Are you looking to take off like a rocket from a stoplight on drag radials? Trim the stall down some, and keep the STR flatter.

Do you want to retain more highway power? Drop the tq multiplication (STR) way down and keep the stall high for shift extension (especially on taller gears, i.e. 2.73, 3.23).

If you're keeping 3.23's, you can afford a higher stall and higher STR.

If you're swapping to 3.73's later, you'd better have slicks if you want to hook up with something high STR/high stall.

Cam selection plays a big role as well. You can make use of massive shift extension with a high stall if your cam spins 6700+. If you're shifting a lot lower, it won't help as much.

A lot of people have a great deal of fun on the street with a high stall/high STR, but that's partially because they like blowing their street tires off at will, which may be fun, but it's not fast.... so again, depends on what you're looking for. The most "fun" combo for you may not be the fastest.

Above all, don't go overboard with STR. Extremely high STR tends to be very 'peaky', meaning the multiplication hits in a spike, which will brake the tires loose, leaving you spinning even after it drops off.

As far as 4000+ being the only way to go.... that's preference. A 4000+ car will be a blast to drive, but line up next to a guy with a 3600 at a stoplight while you're both on street tires or DR's, and he'll have a very big edge in terms of consistency. But it boils down to what's more enjoyable for you?

 

o.0 I like that break down. So if I'm going for a purely street driven vehicle then a 3600 or possibly lower would be more suited for what I'm looking for.

Blowing the tires off at will, I admit, is pretty cool but it isn't going to help me be any quicker when I do hit the occasional street race. So a lower stall with a moderate STR would be better?

 

For something that's purely street... you have 2 ways to balance it. You want to make sure your overall applied torque (the amount that hits the tires) is in the realm of what a street tire can handle. To achieve that, you have to decide if you want to lean more towards stall, or more towards STR. For a lot of people that comes down to feel. The higher stall/lower STR will feel "looser", while the lower stall/higher STR will have a tighter feel, but... too much STR is no good.

With 3.23's on an A4, you still have a big gap between gears, so you want enough stall to keep the engine in the powerband after a shift, so anything 3000+ will be a big help for that. In terms of STR, remember that more STR directly reduces efficiency, and thus, less rwhp.

It's pretty much a big equation... engine torque at launch rpm x STR ratio at launch rpm x 1st gear ratio x rear end ratio.

Bumping up stall speed will increase launch rpm and thus have your engine putting out more torque when you launch. You can achieve the same applied torque by lowering launch rpm (or lowering stall) and increasing STR. Just remember not to overdo it on STR.... it's just like any part selection, if you go with more than you can use, you're giving up a little elsewhere (in this case, top end rwhp and trap speed).

So don't just settle on stall speed, look around at different STR's. Stall is a good place to start since it will determine your launch rpm, shift extension, and overall converter feel.