Why do autos dyno low?
12-08-2006, 12:53 AM
#41
Pro. B.S. caller outer
Join Date: May 2004
Location: IL
Posts: 9,644
RE: Why do autos dyno low?
ORIGINAL: musclemustang94
Yeah for sure, I live in Surprise and I am going to UTI. To test a convertor you apply the brakes and full throttle and see how far the rpms go up, thats called stall speed. It only takes like 30 seconds to overheat your trans doin this so your only supposed to do it for like 5 seconds. my point is that the convertor generates ALOT of the heat, 'specially with a high stall cuz the fliud going one way and crashing into the other creates a ton of friction and a ton of heat. Convertors are weird, I heard you can go to how stuff works.com to see how they work its kind of hard to explain. But if you go there you'll see what i mean.
ORIGINAL: tinman
musclemustang; I would concur with you on most of what you said.
I think peeps don't realize the amount of heat that's created by the converter.
Here in Arizona, it's not uncommon to race at night in the summers. I've seen air temp's of 103 at midnight. I don't even want to know what the temp of the trans fluid is with my 3500 stall converter........
musclemustang; I would concur with you on most of what you said.
I think peeps don't realize the amount of heat that's created by the converter.
Here in Arizona, it's not uncommon to race at night in the summers. I've seen air temp's of 103 at midnight. I don't even want to know what the temp of the trans fluid is with my 3500 stall converter........
12-08-2006, 01:04 AM
#42
6th Gear Member
Join Date: Feb 2005
Location:
Posts: 8,439
RE: Why do autos dyno low?
ORIGINAL: JD1969
I just want to point out that this is not true stall speed, to find true stall you would a trans brake.
ORIGINAL: musclemustang94
Yeah for sure, I live in Surprise and I am going to UTI. To test a convertor you apply the brakes and full throttle and see how far the rpms go up, thats called stall speed. It only takes like 30 seconds to overheat your trans doin this so your only supposed to do it for like 5 seconds. my point is that the convertor generates ALOT of the heat, 'specially with a high stall cuz the fliud going one way and crashing into the other creates a ton of friction and a ton of heat. Convertors are weird, I heard you can go to how stuff works.com to see how they work its kind of hard to explain. But if you go there you'll see what i mean.
ORIGINAL: tinman
musclemustang; I would concur with you on most of what you said.
I think peeps don't realize the amount of heat that's created by the converter.
Here in Arizona, it's not uncommon to race at night in the summers. I've seen air temp's of 103 at midnight. I don't even want to know what the temp of the trans fluid is with my 3500 stall converter........
musclemustang; I would concur with you on most of what you said.
I think peeps don't realize the amount of heat that's created by the converter.
Here in Arizona, it's not uncommon to race at night in the summers. I've seen air temp's of 103 at midnight. I don't even want to know what the temp of the trans fluid is with my 3500 stall converter........
http://www.edgeracingconverters.com/basics.html
12-08-2006, 01:24 AM
#43
4th Gear Member
Join Date: Mar 2005
Location: south carolina
Posts: 1,037
RE: Why do autos dyno low?
ORIGINAL: 92hatchLX
+1, there's actually a few ways that they measure stall. Foot Brake stall, flash stall, and true stall. Here's a good explanation of all three and some more info on torque converters that might help the AOD newbies.
http://www.edgeracingconverters.com/basics.html
ORIGINAL: JD1969
I just want to point out that this is not true stall speed, to find true stall you would a trans brake.
ORIGINAL: musclemustang94
Yeah for sure, I live in Surprise and I am going to UTI. To test a convertor you apply the brakes and full throttle and see how far the rpms go up, thats called stall speed. It only takes like 30 seconds to overheat your trans doin this so your only supposed to do it for like 5 seconds. my point is that the convertor generates ALOT of the heat, 'specially with a high stall cuz the fliud going one way and crashing into the other creates a ton of friction and a ton of heat. Convertors are weird, I heard you can go to how stuff works.com to see how they work its kind of hard to explain. But if you go there you'll see what i mean.
ORIGINAL: tinman
musclemustang; I would concur with you on most of what you said.
I think peeps don't realize the amount of heat that's created by the converter.
Here in Arizona, it's not uncommon to race at night in the summers. I've seen air temp's of 103 at midnight. I don't even want to know what the temp of the trans fluid is with my 3500 stall converter........
musclemustang; I would concur with you on most of what you said.
I think peeps don't realize the amount of heat that's created by the converter.
Here in Arizona, it's not uncommon to race at night in the summers. I've seen air temp's of 103 at midnight. I don't even want to know what the temp of the trans fluid is with my 3500 stall converter........
http://www.edgeracingconverters.com/basics.html
12-08-2006, 01:27 AM
#44
6th Gear Member
Join Date: Feb 2005
Location:
Posts: 8,439
RE: Why do autos dyno low?
Whenever they decide to open up Bandimere and I get some stickier tires. Hopefully it's not in the mid to high 90s again like it was last time I went 
. I'm hoping to drop more than a full second since last time also, which I'm sure that I'll acheive.
. I'm hoping to drop more than a full second since last time also, which I'm sure that I'll acheive.
12-08-2006, 01:29 AM
#45
5th Gear Member
Join Date: Jul 2006
Location: Alton, New Hampshire
Posts: 2,518
RE: Why do autos dyno low?
ORIGINAL: 92hatchLX
Whenever they decide to open up Bandimere and I get some stickier tires. Hopefully it's not in the mid to high 90s again like it was last time I went. I'm hoping to drop more than a full second since last time also, which I'm sure that I'll acheive.
Whenever they decide to open up Bandimere and I get some stickier tires. Hopefully it's not in the mid to high 90s again like it was last time I went
. I'm hoping to drop more than a full second since last time also, which I'm sure that I'll acheive.
Did you get your car back together man?
12-08-2006, 02:15 AM
#46
2nd Gear Member
Join Date: Aug 2006
Posts: 317
RE: Why do autos dyno low?
tourque conventers are tourque multipliers... look up the multiplier of a converter... good one roughly 2.2-2.5.. so if u have a 300ft/lbt engine and a converter stalls at 3000rpm.. at 3000rpm for a slpit second u have have 600lb/ft
12-08-2006, 02:23 AM
#47
6th Gear Member
Join Date: Feb 2005
Location:
Posts: 8,439
RE: Why do autos dyno low?
ORIGINAL: frdmstng1986GT
Did you get your car back together man?
ORIGINAL: 92hatchLX
Whenever they decide to open up Bandimere and I get some stickier tires. Hopefully it's not in the mid to high 90s again like it was last time I went. I'm hoping to drop more than a full second since last time also, which I'm sure that I'll acheive.
Whenever they decide to open up Bandimere and I get some stickier tires. Hopefully it's not in the mid to high 90s again like it was last time I went
. I'm hoping to drop more than a full second since last time also, which I'm sure that I'll acheive.
Did you get your car back together man?
12-08-2006, 03:07 AM
#48
5th Gear Member
Join Date: Jul 2006
Location: Alton, New Hampshire
Posts: 2,518
RE: Why do autos dyno low?
ORIGINAL: 92hatchLX
I decided to tease myself with it tonight and call it quits. All that I have left to do is tighten down the upper intake, put in radiator, fan, fan shroud, and coolant, start it up and do an oil change. I was close to finishing it tonight but I was hurting and I had to stop, I'll have videos of it running (hopefully it will run!) tomorrow evening.
ORIGINAL: frdmstng1986GT
Did you get your car back together man?
ORIGINAL: 92hatchLX
Whenever they decide to open up Bandimere and I get some stickier tires. Hopefully it's not in the mid to high 90s again like it was last time I went. I'm hoping to drop more than a full second since last time also, which I'm sure that I'll acheive.
Whenever they decide to open up Bandimere and I get some stickier tires. Hopefully it's not in the mid to high 90s again like it was last time I went
. I'm hoping to drop more than a full second since last time also, which I'm sure that I'll acheive.
Did you get your car back together man?
12-08-2006, 07:39 AM
#49
2nd Gear Member
Join Date: Nov 2005
Location:
Posts: 248
RE: Why do autos dyno low?
ORIGINAL: P Zero
Not only do they eat up more HP, but the first gear in the trans isnt as steep as it is in the 5 spd, which = less torque.
-P.
Not only do they eat up more HP, but the first gear in the trans isnt as steep as it is in the 5 spd, which = less torque.
-P.
12-08-2006, 01:33 PM
#50
6th Gear Member
Join Date: Feb 2005
Location:
Posts: 8,439
RE: Why do autos dyno low?
ORIGINAL: frop
NM I'm just gonna leave this alone.........
ORIGINAL: P Zero
Not only do they eat up more HP, but the first gear in the trans isnt as steep as it is in the 5 spd, which = less torque.
-P.
Not only do they eat up more HP, but the first gear in the trans isnt as steep as it is in the 5 spd, which = less torque.
-P.