DYNO operator/equipment errors? Are they possible?
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,922
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
DYNO operator/equipment errors? Are they possible?
Just curious who here has had there Car run wierd on the dyno, yet run fine on the road or another dyno? Can the dyno be hooked up worng? Can haveing the wires they use to read rpm etc make your ignition misfire, DELTEQ?, ASR on, E Brake on etc etc. Just curious as I am trying to find out why my car ran LEAN (according to the tailpipe AFR readings, 14 to 1), yet dumped black smoke on 2 different tunes. F/P made no difference either.
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,922
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
No changes really in the AFR meter, but why would my Vette poor black smoke out? I think it was kinda weird, as the operator said he heard pinging (which how he did ina closed building is beyond me), and yet it ran fine to the dyno and after the dyno with no pinging or black smoke?
Racer
Joined: May 2006
Posts: 286
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From: Alpine California
Dyno's are funny critters, lots of variance between different machines, brands, etc... But with that being said, they are also a very extreme test of your car, it is entirely possible that the car could ping on the dyno, but not out in the real world, due to not being under quite as much of a load, running cooler due to better airflow across the radiator, etc... but your dyno operator should have been able to see the detonation on the dyno readouts, at least one of the graphs (and for the life of me, I can't remember which one right now. It's been a couple of years since I've been on a chassis dyno.) should have gotten real erratic when the car started detonating. Need a little more info on the black smoke, lots of cars will smoke on deceleration, but it shouldn't have smoked while it was accelerating during the run. The A/F ratio should have moved around somewhat during the run though, should have peaked rich when the throttle snapped shut if nothing else.
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,922
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Hopefully I will get the Dyno files soon so someone can look at them. I am wondering of the DELTEQ could have had issues with there cabling right on the DELTEQ to get RPM?
But it blew black smoke on acceleration, and cleared when he blipped the throttle.
But it blew black smoke on acceleration, and cleared when he blipped the throttle.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Operator error 
jeez thats a good one. Sadly enough it happens all the time to so called tuner shops. Take for instance, Glens car that was sent to me from So Cal. A tuner shop there attempted to tune a blown 383 with 2 burnt plug wires and was unable to diagnois one of the most basic tune up problems of which was the fried wires. A simple ignition scope shows the problem like a sore thumb.
jeez thats a good one. Sadly enough it happens all the time to so called tuner shops. Take for instance, Glens car that was sent to me from So Cal. A tuner shop there attempted to tune a blown 383 with 2 burnt plug wires and was unable to diagnois one of the most basic tune up problems of which was the fried wires. A simple ignition scope shows the problem like a sore thumb.
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Brent and I wouldn't even bother to tune a car unless it was otherwise running. Sure we'd tell you what's wrong, but actually changing plugs and wires, things like that, were your problem as we had other jobs, the dyno was a secondary aspect of the business.
As far as actually mis-operating the dyno, lord I hope not, if it's a dynojet anyway. You press the button when you start and you press the button when you stop. I'm sure there are people out there who can screw it up, but it's takes a real winner.
As far as actually mis-operating the dyno, lord I hope not, if it's a dynojet anyway. You press the button when you start and you press the button when you stop. I'm sure there are people out there who can screw it up, but it's takes a real winner.
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Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,922
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Okay, it had new plugs, new O2's, new wires, checked the valvetrain, ran good, great throttle response, in closed loop after 32 seconds. What about a ignition getting a signal messed up by having the cables for the RPM and another cable on there(dont know what it was), right on top of the DELTEQ?
Melting Slicks
Joined: Jul 2004
Posts: 2,695
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From: Chicago Illinois
Steve, look into a datamaster log. This was very helpful in ponting out one side of my engine was running rich due to a new faulty heated O2 sensor. Trial and error, swapped it out with regular sensor, problem gone. Run the datalog with the dyno wideband and will be able to help. Without the log would never of found the problem since O2 were new!
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,922
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Originally Posted by bobmic93
Steve, look into a datamaster log. This was very helpful in ponting out one side of my engine was running rich due to a new faulty heated O2 sensor. Trial and error, swapped it out with regular sensor, problem gone. Run the datalog with the dyno wideband and will be able to help. Without the log would never of found the problem since O2 were new!
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,922
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
On this link are my dyno AFR graphs
Steves dyno and these are with heated O2's and DELTEQ, and the videos are from other cars there.
here is my old dyno graph across town.
Steves dyno and these are with heated O2's and DELTEQ, and the videos are from other cars there.
here is my old dyno graph across town.
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
I've had trouble getting a tach lead off a delteq box before. Its been so long ago I can't remeber what it was but I think we had to go with a reflector on the crank to pick it up.
Really as long as he puts the car on the dyno straight, the weather station reports right, he gets a good tach lead and dynos in the right gear there isn't much else he can get wrong.
If the filter on thepump gets clogged it will read pretty lean
Remeber theres a few different types of smoke. Most people see smoke and thing its automatically running rich. The car will also smoke a different color whenits lean and pinging.
Really as long as he puts the car on the dyno straight, the weather station reports right, he gets a good tach lead and dynos in the right gear there isn't much else he can get wrong.
If the filter on thepump gets clogged it will read pretty lean
Remeber theres a few different types of smoke. Most people see smoke and thing its automatically running rich. The car will also smoke a different color whenits lean and pinging.
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,922
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Originally Posted by Alvin
I've had trouble getting a tach lead off a delteq box before. Its been so long ago I can't remeber what it was but I think we had to go with a reflector on the crank to pick it up.
Really as long as he puts the car on the dyno straight, the weather station reports right, he gets a good tach lead and dynos in the right gear there isn't much else he can get wrong.
If the filter on thepump gets clogged it will read pretty lean
Remeber theres a few different types of smoke. Most people see smoke and thing its automatically running rich. The car will also smoke a different color whenits lean and pinging.
Really as long as he puts the car on the dyno straight, the weather station reports right, he gets a good tach lead and dynos in the right gear there isn't much else he can get wrong.
If the filter on thepump gets clogged it will read pretty lean
Remeber theres a few different types of smoke. Most people see smoke and thing its automatically running rich. The car will also smoke a different color whenits lean and pinging.
I think its a misfire or I need to reverify my O2 sensors. They show there working . They took a few tried to get the RPM, and ended up right on the delteq above the coils, which I think may have been a problem due to RF there. But the car runs fine on the street.
I am just diagnosing what could be wrong. I dont think the tune is, because its really no different than the last dyno shown here, just a different ignition and O2's.
I am betting its a "Steveism"
and I will find the gremlim when I get back to Hawaii.