Halltech question.....
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,310
Likes: 93
From: Hager City WI
Sounds good. Please be advised about the dyno.
Folks get varied results on the dyno. The reason is even with the huge gigantic fans blowing on the front of the car it will not dissipate or remove heat fast enough for the blown and already heat challenged Z06.
So what you find is your first run (if the car is fairly cool) will be very strong. Then your subsequent runs will drop by as much as 50hp and 50 ftlbs of tq. This is where you will see as much as 7-10* of timing pulled. This is due to a form of heat soak created because the entire car is sitting still and not moving through the atmosphere. Takes 1 run to see this on the dyno during the summer. Happens at the strip as well but not as bad assuming you have to wait your turn in line before each run. Can and has happened on the street but much harder to create this condition before you go to jail.
That being said if your intercooler coolant isn't working as it should it could also create a form of heat soak (increased charge temps from compressing boosted air) with the result being the PCM pulling timing.
Again if you logged or log the correct parameters you can see all of this in the data.
Good luck
Folks get varied results on the dyno. The reason is even with the huge gigantic fans blowing on the front of the car it will not dissipate or remove heat fast enough for the blown and already heat challenged Z06.
So what you find is your first run (if the car is fairly cool) will be very strong. Then your subsequent runs will drop by as much as 50hp and 50 ftlbs of tq. This is where you will see as much as 7-10* of timing pulled. This is due to a form of heat soak created because the entire car is sitting still and not moving through the atmosphere. Takes 1 run to see this on the dyno during the summer. Happens at the strip as well but not as bad assuming you have to wait your turn in line before each run. Can and has happened on the street but much harder to create this condition before you go to jail.
That being said if your intercooler coolant isn't working as it should it could also create a form of heat soak (increased charge temps from compressing boosted air) with the result being the PCM pulling timing.
Again if you logged or log the correct parameters you can see all of this in the data.
Good luck
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,310
Likes: 93
From: Hager City WI
If that's so than why did your car pick up on "higher" DA days?
I think you really know the answer but just don't want to face it.
Most likely if you have to much air in the stock system the way GM set it up it may circulate in the system having an effect on the pump/pumping action. I really am just taking a shot in the dark but maybe if a large enough pocket of air gets to the pump it may stop pumping. I know you have heard of priming the pump, well maybe the pump can lose its prime.
PS: That is why they put a viewing window in the tank which is a great selling point. You can check if the pump is flowing by just taking a look and if you really can't tell for sure than take the top off and check for flow. The stock set-up does not really have that so I would just grab the two hoses; one should be cooler and the other (return) hose should be hotter.
I think you really know the answer but just don't want to face it.
Most likely if you have to much air in the stock system the way GM set it up it may circulate in the system having an effect on the pump/pumping action. I really am just taking a shot in the dark but maybe if a large enough pocket of air gets to the pump it may stop pumping. I know you have heard of priming the pump, well maybe the pump can lose its prime.
PS: That is why they put a viewing window in the tank which is a great selling point. You can check if the pump is flowing by just taking a look and if you really can't tell for sure than take the top off and check for flow. The stock set-up does not really have that so I would just grab the two hoses; one should be cooler and the other (return) hose should be hotter.
No idea what you mean by I know the answer but I don't want to face it???
The only reason that I even care about air in the system is what I read from GM saying that it can cause "severe power loss". Maybe the addition of the Granatelli tank changes this? Just trying to get to the bottom of why my car fell on it's face in perfect conditions.
Safety Car
Joined: May 2000
Posts: 4,827
Likes: 352
From: Albuquerque NM
Sounds good. Please be advised about the dyno.
Folks get varied results on the dyno. The reason is even with the huge gigantic fans blowing on the front of the car it will not dissipate or remove heat fast enough for the blown and already heat challenged Z06.
So what you find is your first run (if the car is fairly cool) will be very strong. Then your subsequent runs will drop by as much as 50hp and 50 ftlbs of tq. This is where you will see as much as 7-10* of timing pulled. This is due to a form of heat soak created because the entire car is sitting still and not moving through the atmosphere. Takes 1 run to see this on the dyno during the summer. Happens at the strip as well but not as bad assuming you have to wait your turn in line before each run. Can and has happened on the street but much harder to create this condition before you go to jail.
That being said if your intercooler coolant isn't working as it should it could also create a form of heat soak (increased charge temps from compressing boosted air) with the result being the PCM pulling timing.
Again if you logged or log the correct parameters you can see all of this in the data.
Good luck
Folks get varied results on the dyno. The reason is even with the huge gigantic fans blowing on the front of the car it will not dissipate or remove heat fast enough for the blown and already heat challenged Z06.
So what you find is your first run (if the car is fairly cool) will be very strong. Then your subsequent runs will drop by as much as 50hp and 50 ftlbs of tq. This is where you will see as much as 7-10* of timing pulled. This is due to a form of heat soak created because the entire car is sitting still and not moving through the atmosphere. Takes 1 run to see this on the dyno during the summer. Happens at the strip as well but not as bad assuming you have to wait your turn in line before each run. Can and has happened on the street but much harder to create this condition before you go to jail.
That being said if your intercooler coolant isn't working as it should it could also create a form of heat soak (increased charge temps from compressing boosted air) with the result being the PCM pulling timing.
Again if you logged or log the correct parameters you can see all of this in the data.
Good luck
Instructor
Joined: Jul 2015
Posts: 136
Likes: 10
From: Gilbert Arizona
Melting Slicks
Joined: Oct 2007
Posts: 2,398
Likes: 858
If you don't detect a rise in engine temp and or a rise in IAT between runs then there is absolutely no reason to expect much of a variation in power output between runs.
Last edited by dar02081961; Oct 23, 2015 at 11:31 PM.
Le Mans Master
Joined: May 2003
Posts: 8,117
Likes: 67
From: USA
We are in the process of purchasing a much larger facility here in Wisconsin, which should happen sometime in November. We will likely be able to do installs there next year. Tuning? Maybe. Exhaust? Yes, with GM approved systems.
We have several huge things happening next year, that will transform our business model.
Jim
We have several huge things happening next year, that will transform our business model.
Jim
Jim
Supporting Vendor
Joined: Mar 2002
Posts: 13,099
Likes: 672
From: Bristol, Tennessee
St. Jude Donor '09
An opportunity came along on the exact day I was ready get some rest and relaxation. So big, that I can wait.
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"World Class Performance for your Corvette"
Intake Design and Engineering since 1999
Halltech Systems, LLC
423-915-6056
For service email:
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www.halltechsystems.com
"World Class Performance for your Corvette"
Intake Design and Engineering since 1999
Halltech Systems, LLC
423-915-6056
For service email:
orders@halltechsystems.com
www.halltechsystems.com
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