Help Me Pic An Str Ratio.
Help Me Pic An Str Ratio. As some of you may know im in the market for a new converter. Im pretty much set on a stall around 3,800 or so but unsure of the str i should get. Right now i have a midwest 3k stall 2.0 str. I would want my new converter easy to launch/pedal. I have nitto dr's(275's)and i have suspension mods. Front qa1's and new springs on the way.. So what str would i be happy with. My main concern is hooking up easily with dr's. As it stands right now the converter i have spins the tires at 1/4 throttle and its anoying when im at the track. Other wise the converter is great..
11 Second Club
Joined: Nov 2001
Posts: 1,320
Likes: 0
From: NE PA
Well, you're obviously going to need something less than what you have now which is a 2.0 STR especially since you're going with a higher stall speed which will just exacerbate the traction situation.
If you look at my signature, you'll see my best time from last year. With the trap speeds I had last season (avg. 114-115 mph), I should have been running in the 11's, but I wasn't because my 60' times sucked and I was spinning a third of the way down the track. That was on street tires and a Yank 3000/1.9 STR.
Over the winter I swapped in a Yank SY3500 which has a 1.63 STR. I also just put a set of Nitto drag radials on the rear wheels. I haven't gotten to the track yet this year, but the Nittos seem to be hooking up very well with the new converter.
If I were you, I'd consider something in the 1.6 to 1.9 range.
Good luck!
If you look at my signature, you'll see my best time from last year. With the trap speeds I had last season (avg. 114-115 mph), I should have been running in the 11's, but I wasn't because my 60' times sucked and I was spinning a third of the way down the track. That was on street tires and a Yank 3000/1.9 STR.
Over the winter I swapped in a Yank SY3500 which has a 1.63 STR. I also just put a set of Nitto drag radials on the rear wheels. I haven't gotten to the track yet this year, but the Nittos seem to be hooking up very well with the new converter.
If I were you, I'd consider something in the 1.6 to 1.9 range.
Good luck!
thanx xtrooper, i was actually going to pm you cause i seen that you had the sy3500. I was looking at something sub 2.0 but lots of people tell me 2.5 and more. Im like are you crazy, i said i want to hook up not spin and i dont plan on et streets, just some dr's. I have also been trying to get people to tell me if a 3k 2.0 str converter is harder/easier to launch than say a 3,500 with 2.0 or do they launch the same.
I know a lot of people think its crazy because they say they wan't to hookup and not spin. But I never had traction with my stock converter, on the street that is. lol. I daily drive my 3200 2.5 str stall with no problems.
I had the same initial fears too.
I had the same initial fears too.
I think the lower STR will be more forgiving, you will
have more control as the torque will roll on slower.
The higher STR will hook up more abruptly and I think
will shock the tires more (smooth would hold on longer).
Lower STR will also multiply torque longer while high STR
will give you a big hit that fades to 1:1 (ish) sooner.
I have yet to find a decent launch and I "only" have a
2.2 STR. My 60' times are marginally worse than they
were, stock, on the same crappy track, after converter
despite better tires and so far soft pedal or just flooring
it makes no difference. The high STR does however make
the 1-2 lose traction hard, rather than just chirp like stock.
Not so good for keeping in your lane.
have more control as the torque will roll on slower.
The higher STR will hook up more abruptly and I think
will shock the tires more (smooth would hold on longer).
Lower STR will also multiply torque longer while high STR
will give you a big hit that fades to 1:1 (ish) sooner.
I have yet to find a decent launch and I "only" have a
2.2 STR. My 60' times are marginally worse than they
were, stock, on the same crappy track, after converter
despite better tires and so far soft pedal or just flooring
it makes no difference. The high STR does however make
the 1-2 lose traction hard, rather than just chirp like stock.
Not so good for keeping in your lane.
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
Originally Posted by jimmyblue
I think the lower STR will be more forgiving, you will
have more control as the torque will roll on slower.
I have yet to find a decent launch and I "only" have a
2.2 STR. My 60' times are marginally worse than they
were, stock, on the same crappy track, after converter
despite better tires and so far soft pedal or just flooring
it makes no difference. The high STR does however make
the 1-2 lose traction hard, rather than just chirp like stock.
Not so good for keeping in your lane.
have more control as the torque will roll on slower.
I have yet to find a decent launch and I "only" have a
2.2 STR. My 60' times are marginally worse than they
were, stock, on the same crappy track, after converter
despite better tires and so far soft pedal or just flooring
it makes no difference. The high STR does however make
the 1-2 lose traction hard, rather than just chirp like stock.
Not so good for keeping in your lane.
11 Second Club
Joined: Nov 2001
Posts: 1,320
Likes: 0
From: NE PA
Originally Posted by BubaGumpShrimp
thanx xtrooper, i was actually going to pm you cause i seen that you had the sy3500. I was looking at something sub 2.0 but lots of people tell me 2.5 and more. Im like are you crazy, i said i want to hook up not spin and i dont plan on et streets, just some dr's. I have also been trying to get people to tell me if a 3k 2.0 str converter is harder/easier to launch than say a 3,500 with 2.0 or do they launch the same.
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the problem is not always the str, it could be the tires. i think you are giving nitto's too much credit. had 3800 2.5str here, if i hammered it out of the hole of course it would spin my nitto's, but if you learn to launch correctly- rolling into the throttle at the right speed, the higher str is fine- it is also nice to know that if for some odd reason the nitto's are actually hooking that day (it happens once in a while), you can launch really hard- harder than a lower str converter.
if you don't want to learn how to launch, go get the 1.0 str converter or whatever and flash it as hard as you can out of the hole- and be happy. just don't come back saying "my car feels slow, it doesn't hit hard at all and has nothing out of the hole". people have had good results with both high and low str's, it is all personal preference and what you like to do most with the car.
if you don't want to learn how to launch, go get the 1.0 str converter or whatever and flash it as hard as you can out of the hole- and be happy. just don't come back saying "my car feels slow, it doesn't hit hard at all and has nothing out of the hole". people have had good results with both high and low str's, it is all personal preference and what you like to do most with the car.
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The higher STR will hook up more abruptly and I think
will shock the tires more (smooth would hold on longer).
Lower STR will also multiply torque longer while high STR
will give you a big hit that fades to 1:1 (ish) sooner.
will shock the tires more (smooth would hold on longer).
Lower STR will also multiply torque longer while high STR
will give you a big hit that fades to 1:1 (ish) sooner.
How long does torque multiplication last? How does one last longer?
TECH Enthusiast
Joined: Mar 2004
Posts: 647
Likes: 0
From: Australia
If you're serious about drag racing, I wouldnt blow any more money on a converter and go for 90/10 drag suspension. That'll help tremendously. That 3000/2.0 converter should be good for launching. Its your suspension working against it.
yes im getting front shocks soon, i already have them in the rear. As for me not knowing how to lauch, bwaaaaaa. Let me recap my experience-been racing for over 10 years, previous car was an elcamino with a worked 350 with 425hp going to a turbo 350 and a 2,800 stall 2.5str converter going to a 4.11 rear with 275 bfg radial ta's (not even dr's). Well let me say i could hook that car/truck pretty easily. This ta is being a pita. I have all kinds of traction mods,dr's and it still sucks to hook up not to mention it doesnt have nearly the power of my other car.
I think that if you still have 3.23s or 2.73s, your not going to be happy going below a 2.0 str. I think you need to start looking at your suspesion set up. I have a 3500 with a 2.5 str and I've cut low 1.60 on Nitto drag radials no sweat, when the track is complete **** and I have to pedal the car it's usually high 1.70s low 1.80s. I think that a 3,800 with a 1.6str is going to be loose and hit soft as hell with the stock gears.
