Dyno Run - Torque? Where is it!
#1
Haven't we ALL heard this
Thread Starter
Dyno Run - Torque? Where is it!
Here is my dyno sheet from a while back. I am posting it because a friend and I were talking about it.
We are scratching our heads on why the torque is so low. And horsepower is lower than I expected also.
91 TII
-Atkins Mild Streetport
-Majestic Turbo Upgrade (Not sure of compessor upgrade but the turbine was clipped 4 or 8 deg.)
-Bonez Downpipe to a Bonez Hi Flow Cat (2.5")
-Apexi' N1 Duals
-Apexi' cone filter
FUEL
-720CC secondaries
-Walbaro 255 pump
-Rewired pump electrical wires
IGNITON
-Crappy Wires
-MSD 6A on leadings
-New plugs installed before the run (that burned me)
The conditions were less than ideal. The dyon recorded 98F on the airtemp. The site is about 500' above sea level.
My intercooler was so hot after a run you could not touch the fins. We were spraying water on it for several minutes before each run.
One thing I like about the dyno is it makes power right up to 7800rpm.
Things I don't like. The low torque/hp.
A/F? Well, it was a wideband. However, it was installed after the cat and it was pointing into the exhaust stream. From what I hear that is the wrong way to use one. Since then I have installed a Techedge DIY WB but havent had time to play with it.
My thoughts are the cat is destroyed. The car was running rich. The reason I think this is because after one good flogging session the DP and Cat were glowing. Anouther friend thinks it is a boost leak.
Help? Ideas?
James
We are scratching our heads on why the torque is so low. And horsepower is lower than I expected also.
91 TII
-Atkins Mild Streetport
-Majestic Turbo Upgrade (Not sure of compessor upgrade but the turbine was clipped 4 or 8 deg.)
-Bonez Downpipe to a Bonez Hi Flow Cat (2.5")
-Apexi' N1 Duals
-Apexi' cone filter
FUEL
-720CC secondaries
-Walbaro 255 pump
-Rewired pump electrical wires
IGNITON
-Crappy Wires
-MSD 6A on leadings
-New plugs installed before the run (that burned me)
The conditions were less than ideal. The dyon recorded 98F on the airtemp. The site is about 500' above sea level.
My intercooler was so hot after a run you could not touch the fins. We were spraying water on it for several minutes before each run.
One thing I like about the dyno is it makes power right up to 7800rpm.
Things I don't like. The low torque/hp.
A/F? Well, it was a wideband. However, it was installed after the cat and it was pointing into the exhaust stream. From what I hear that is the wrong way to use one. Since then I have installed a Techedge DIY WB but havent had time to play with it.
My thoughts are the cat is destroyed. The car was running rich. The reason I think this is because after one good flogging session the DP and Cat were glowing. Anouther friend thinks it is a boost leak.
Help? Ideas?
James
#3
Haven't we ALL heard this
Thread Starter
Right now according to the Techedge at WOT it is normally 12:1 and richer.
At the time the wideband was worthless.
I need to do a compression check. I hope it isn't but one would be needed just to check
At the time the wideband was worthless.
I need to do a compression check. I hope it isn't but one would be needed just to check
#4
Rotary Freak
Im not sure where the problem could be, but a year ago I dynoed my car;
87 Turbo
150k miles on motor
RB turbo back
S5 turbo w/ upgraded compressor
Stock intake
Stock intercooler.
I was running 6 psi of boost the entire time and the car was tuned to about ~11.2:1 af using an safc. Fuel mods only Walbro in take fuel pump.
My car pulled a peak HP value of 203.5 hp, and 178 tq. So I was about 20tq above you. The outside temperature was about 65 degrees that day but its hard for me to remember.
87 Turbo
150k miles on motor
RB turbo back
S5 turbo w/ upgraded compressor
Stock intake
Stock intercooler.
I was running 6 psi of boost the entire time and the car was tuned to about ~11.2:1 af using an safc. Fuel mods only Walbro in take fuel pump.
My car pulled a peak HP value of 203.5 hp, and 178 tq. So I was about 20tq above you. The outside temperature was about 65 degrees that day but its hard for me to remember.
Last edited by SaabGuy; 06-15-03 at 11:11 AM.
#7
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I had the opposite problem as you. I have about the same mods and My hp was 200 with 225 torque. My turbo was shot them, so I reached max power at 4k RPMS. Your torque number is way too low.
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#11
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Thread Starter
Icemark:
That is an intresting thought. I do like that idea. I will make sure I datalog my AFRs on the runs. See what I can get. I believe I can post my datalogs.
I will have a chance to trouble shoot the car in July. Prob. wont be able to take it to a dyno.
Keep em coming guys!
Anybody know how to get a hold of ReTed?
James
That is an intresting thought. I do like that idea. I will make sure I datalog my AFRs on the runs. See what I can get. I believe I can post my datalogs.
I will have a chance to trouble shoot the car in July. Prob. wont be able to take it to a dyno.
Keep em coming guys!
Anybody know how to get a hold of ReTed?
James
#15
Displacement > Boost
Join Date: Oct 2002
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I don't think a wideband will work behind a cat. I would suggest some tuning with the wideband before the cat. Intuition tells me that the car was running rich, though that may not be a bad thing with your intake temps so high that the intercooler is too hot to touch. Time for some water injection.
#16
Haven't we ALL heard this
Thread Starter
At the dyno the wideband was aft of the cat. My wideband is in the midle of that pipe between the dp and cat.
I think I am gonna order that midpipe from rx7.com so i can trouble shoot the cat.
Can you look inside one and tell it is messed up? I guess i could hit it with a hammer and see if anything bounces around.
James
I think I am gonna order that midpipe from rx7.com so i can trouble shoot the cat.
Can you look inside one and tell it is messed up? I guess i could hit it with a hammer and see if anything bounces around.
James
#18
I'm a boost creep...
Join Date: Jan 2002
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Re: Dyno Run - Torque? Where is it!
Originally posted by Wankel7
-720CC secondaries
-Walbaro 255 pump
-720CC secondaries
-Walbaro 255 pump
My intercooler was so hot after a run you could not touch the fins.
A/F? Well, it was a wideband. However, it was installed after the cat and it was pointing into the exhaust stream. From what I hear that is the wrong way to use one.
#21
Haven't we ALL heard this
Thread Starter
LOL, yeah
We made it rich as hell. I don't the settings but it was +15% above 5000rpm. It just wasn't right at the dyno. I don't know man.
Want to get it datalogged with my wideband.
We made it rich as hell. I don't the settings but it was +15% above 5000rpm. It just wasn't right at the dyno. I don't know man.
Want to get it datalogged with my wideband.