View Poll Results: Which STR with my 2.73's
2.2
7
33.33%
2.5
5
23.81%
2.8
4
19.05%
other
5
23.81%
Voters: 21. You may not vote on this poll
Fuddle STR?
Thread Starter
On The Tree
Joined: Dec 2004
Posts: 115
Likes: 0
From: USA
Fuddle STR? Well the mods I have are in my sig... Will have a tire soon but am still trying to decide on a str. I have 2.73's and will not be changing it. My original plan was to go with a 2.5. Few guys who have 2.73's have been telling me to go with a 2.8. Fuddle has told me to go with a 2.2(seems kinda low considering my gay *** gear size)
What do you guys think?
What do you guys think?
you are aware of what the str means, right? a higher str will hit harder, making traction harder to get. with your gears i wouldn't go any higher than 2.5. not to mention that your tranny won't like any str over stock without torque management.
you cant just "ask" for more str. str is a ratio or a rating. whatever combination you need rpm flash wise is most important. the str is determined by the combination of convertor size and flash rpm desire at the expense of efficiency. you fellas are confusing the tech aspect of the stall converter. if you want a hard hitting, efficient converter, you need a small 9.5" clutch. but they you will have a large (rpm) stall.
its impossible to get a high str without a high rpm flash point yet keeping efficiency within range.
its impossible to get a high str without a high rpm flash point yet keeping efficiency within range.
Thread Starter
On The Tree
Joined: Dec 2004
Posts: 115
Likes: 0
From: USA
Originally Posted by gator's 99TA
you cant just "ask" for more str. str is a ratio or a rating. whatever combination you need rpm flash wise is most important. the str is determined by the combination of convertor size and flash rpm desire at the expense of efficiency. you fellas are confusing the tech aspect of the stall converter. if you want a hard hitting, efficient converter, you need a small 9.5" clutch. but they you will have a large (rpm) stall.
its impossible to get a high str without a high rpm flash point yet keeping efficiency within range.
its impossible to get a high str without a high rpm flash point yet keeping efficiency within range.
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Originally Posted by DeViOuSwOn
I also do not want to be replacing a trans anytime soon.
If you want to save the transmission, get 3.42's or 3.73's in the rear end, buy a 3200-2.0 torque converter, & install an 18,000 GVW or higher transmission cooler. Also, hope that any engine modifications don't exceed a flywheel torque of 350-375 #-ft or less (this should be within the service factor of the transmission (maybe)).
Last edited by LS1-450; Oct 11, 2005 at 02:09 PM.
1) talk to the convertor builder
2) pick your stall size needed (powerband, shift point, shift extension, gearing, weight)
3) pick your convertor size (for efficiency issues)
4) the str will be taken care of.
you guys are missing the point of my post. str is a theoretical number achieved when you put a certian sized converter clutch and stall rating (for a given amount of tq and rearend gearing).
2) pick your stall size needed (powerband, shift point, shift extension, gearing, weight)
3) pick your convertor size (for efficiency issues)
4) the str will be taken care of.
you guys are missing the point of my post. str is a theoretical number achieved when you put a certian sized converter clutch and stall rating (for a given amount of tq and rearend gearing).
TECH Enthusiast
Joined: Mar 2004
Posts: 647
Likes: 0
From: Australia
Yup. You can't pick a converter on STR alone, just like you can't pick a cam on LSA alone. For a DD you want matched STR, not higher or lower for the sake of it, and within reason. Ideally, you want the most efficient, best road feel converter you can get for the stall speed you want. You need to match it to your cars power band, when it comes on cam, what you intend buying it for, will you be towing etc..
You can have a 3600/2.2 and 3600/1.6. The 2.2 would feel way better on the street and at the lights, netting you a better 60'. Why do ppl. go for lower STR? Because their needs are different, for example, a turbo that needs high RPM efficiency but spool RPM for launch. A 2.2STR is pretty high and going any higher you WILL sacrifice efficiency and horsepower to the wheels for a better launch - if you can hold it.
I have a 3400/2.1STR converter and it is about as high as I would go for a DD. But my opinion of what is best wil differ to someone else. My all round best recommendtion for a daily driver is a 3000/2.0. 3400+ is biassing on the track side. Any smaller and the gains are closer to stock, but they are still there.
You can have a 3600/2.2 and 3600/1.6. The 2.2 would feel way better on the street and at the lights, netting you a better 60'. Why do ppl. go for lower STR? Because their needs are different, for example, a turbo that needs high RPM efficiency but spool RPM for launch. A 2.2STR is pretty high and going any higher you WILL sacrifice efficiency and horsepower to the wheels for a better launch - if you can hold it.
I have a 3400/2.1STR converter and it is about as high as I would go for a DD. But my opinion of what is best wil differ to someone else. My all round best recommendtion for a daily driver is a 3000/2.0. 3400+ is biassing on the track side. Any smaller and the gains are closer to stock, but they are still there.
mine is a 2.1 and it seems to hit pretty hard. W/ out drags I couldnt hook up at all tillabout 35mph. I also got the 3.23 rear gears. I would say not to go over a 2.2 STR. Thats just my two cents though
Not saying that its them that are lying. I just know that Yank says that anyone besides them and Precision Industries that advertises STR is making false claims. False claims = polite term for lie.
TECH Enthusiast
Joined: Mar 2004
Posts: 647
Likes: 0
From: Australia
So I guess the thousands of converter manufacturers across the globe that use the Sonnex lookup charts for STR and STALL RPM based on mathematical and real-world research are lying too?
Get real...
Change the weight and power of a car, and the stall and STR changes. Its a crap shoot unless you get a custom made converter.
Get real...
Change the weight and power of a car, and the stall and STR changes. Its a crap shoot unless you get a custom made converter.