Halltech Shroud Mod Gains
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Halltech Shroud Mod Gains
My son came by today with his scanner. I wanted to see what my inlet air temps (IAT) were doing with just the K&N inlet. We then logged the same data on CBFR's car that has a K&N inlet and the DIY Halltech Shroud mod. The good news is that I have a free mod that I can do that will help me quite a bit. The bad news is CBFR says it's a real pain to pull that shroud.
Ambient during my logging was around 85F. IAT's ran between 104F and 123F. During a hard run it would get down to 104F and I was letting off at around 55 mph. CBFR IAT's ran 87F to 98F (the ambient was up to 86 during his logging). Plus his temps would drop a lot faster than mine and would never heat up as much as mine. That means he was as little as 1 degree over ambient and the closest I got was 19 degrees above ambient.
So tomorrow I get under the car to remove the shroud. I'll post my temps after doing the mod, but I would expect the same results as CBFR.
If I can improve my IAT by 18 degrees, that is around .15 and 1 mph at the track.
Ambient during my logging was around 85F. IAT's ran between 104F and 123F. During a hard run it would get down to 104F and I was letting off at around 55 mph. CBFR IAT's ran 87F to 98F (the ambient was up to 86 during his logging). Plus his temps would drop a lot faster than mine and would never heat up as much as mine. That means he was as little as 1 degree over ambient and the closest I got was 19 degrees above ambient.
So tomorrow I get under the car to remove the shroud. I'll post my temps after doing the mod, but I would expect the same results as CBFR.
If I can improve my IAT by 18 degrees, that is around .15 and 1 mph at the track.
Drifting
Joined: Jul 2005
Posts: 1,533
Likes: 0
From: az
Originally Posted by glennhl
My son came by today with his scanner. I wanted to see what my inlet air temps (IAT) were doing with just the K&N inlet. We then logged the same data on CBFR's car that has a K&N inlet and the DIY Halltech Shroud mod. The good news is that I have a free mod that I can do that will help me quite a bit. The bad news is CBFR says it's a real pain to pull that shroud.
Ambient during my logging was around 85F. IAT's ran between 104F and 123F. During a hard run it would get down to 104F and I was letting off at around 55 mph. CBFR IAT's ran 87F to 98F (the ambient was up to 86 during his logging). Plus his temps would drop a lot faster than mine and would never heat up as much as mine. That means he was as little as 1 degree over ambient and the closest I got was 19 degrees above ambient.
So tomorrow I get under the car to remove the shroud. I'll post my temps after doing the mod, but I would expect the same results as CBFR.
If I can improve my IAT by 18 degrees, that is around .15 and 1 mph at the track.
Ambient during my logging was around 85F. IAT's ran between 104F and 123F. During a hard run it would get down to 104F and I was letting off at around 55 mph. CBFR IAT's ran 87F to 98F (the ambient was up to 86 during his logging). Plus his temps would drop a lot faster than mine and would never heat up as much as mine. That means he was as little as 1 degree over ambient and the closest I got was 19 degrees above ambient.
So tomorrow I get under the car to remove the shroud. I'll post my temps after doing the mod, but I would expect the same results as CBFR.
If I can improve my IAT by 18 degrees, that is around .15 and 1 mph at the track.
regrading the pita part with that mod halltech cai piece. this is exact reason i told yell03 to just drill a few holes on each side, it is a quick 10 minute job at the most. let me know if you want help.
Drifting
Joined: Sep 2005
Posts: 1,775
Likes: 1
From: Rehoboth Beach Delaware
Originally Posted by cbrf4i1
i also added a panel on each side to help direct outside air to the air filter. you sure don't want these ambient air going by the headers and then out of engine compartment without giving the air filter a shot at it first.
regrading the pita part with that mod halltech cai piece. this is exact reason i told yell03 to just drill a few holes on each side, it is a quick 10 minute job at the most. let me know if you want help.
regrading the pita part with that mod halltech cai piece. this is exact reason i told yell03 to just drill a few holes on each side, it is a quick 10 minute job at the most. let me know if you want help.
If you modify it , you then have the beginning of an air plenum that houses the filter. Working on ducting the fascia extension openings to within a few inches of the filter
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Pro
Joined: Nov 2004
Posts: 608
Likes: 1
From: Oregon
Originally Posted by glennhl
My son came by today with his scanner. I wanted to see what my inlet air temps (IAT) were doing with just the K&N inlet. We then logged the same data on CBFR's car that has a K&N inlet and the DIY Halltech Shroud mod. The good news is that I have a free mod that I can do that will help me quite a bit. The bad news is CBFR says it's a real pain to pull that shroud.
Ambient during my logging was around 85F. IAT's ran between 104F and 123F. During a hard run it would get down to 104F and I was letting off at around 55 mph. CBFR IAT's ran 87F to 98F (the ambient was up to 86 during his logging). Plus his temps would drop a lot faster than mine and would never heat up as much as mine. That means he was as little as 1 degree over ambient and the closest I got was 19 degrees above ambient.
So tomorrow I get under the car to remove the shroud. I'll post my temps after doing the mod, but I would expect the same results as CBFR.
If I can improve my IAT by 18 degrees, that is around .15 and 1 mph at the track.
Ambient during my logging was around 85F. IAT's ran between 104F and 123F. During a hard run it would get down to 104F and I was letting off at around 55 mph. CBFR IAT's ran 87F to 98F (the ambient was up to 86 during his logging). Plus his temps would drop a lot faster than mine and would never heat up as much as mine. That means he was as little as 1 degree over ambient and the closest I got was 19 degrees above ambient.
So tomorrow I get under the car to remove the shroud. I'll post my temps after doing the mod, but I would expect the same results as CBFR.
If I can improve my IAT by 18 degrees, that is around .15 and 1 mph at the track.
You may consider just taping up the holes on the front of the car to block the air flow provided by the shroud.
Safety Car
Joined: Sep 2006
Posts: 3,846
Likes: 0
From: Boca Raton Inlet, Atlantic Ocean (Floridas east coast)
Originally Posted by cbrf4i1
i also added a panel on each side to help direct outside air to the air filter. you sure don't want these ambient air going by the headers and then out of engine compartment without giving the air filter a shot at it first.
regrading the pita part with that mod halltech cai piece. this is exact reason i told yell03 to just drill a few holes on each side, it is a quick 10 minute job at the most. let me know if you want help.
regrading the pita part with that mod halltech cai piece. this is exact reason i told yell03 to just drill a few holes on each side, it is a quick 10 minute job at the most. let me know if you want help.
Drifting
Joined: Jul 2005
Posts: 1,533
Likes: 0
From: az
Originally Posted by Silver05GTO
Why not just cut the shroud like some of the other CAI's do? If you ever want a full stock peice back they can be bought cheap from GM (like $35 I believe)
for us in AZ, summer time high temp can reach 115*+, (3 straight months of 110*+) stealing air from the radiator to lower the underhood temp is like rubbing peter to paid paul.
Drifting
Joined: Jul 2005
Posts: 1,533
Likes: 0
From: az
Originally Posted by RBYCC
Howard (yell03) mentioned reversing the stock filter shield.
If you modify it , you then have the beginning of an air plenum that houses the filter. Working on ducting the fascia extension openings to within a few inches of the filter
If you modify it , you then have the beginning of an air plenum that houses the filter. Working on ducting the fascia extension openings to within a few inches of the filter
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Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by Silver05GTO
Why not just cut the shroud like some of the other CAI's do? If you ever want a full stock peice back they can be bought cheap from GM (like $35 I believe)
Team Owner
Joined: Dec 2003
Posts: 57,408
Likes: 164
From: queensbury ny
So tomorrow I get under the car to remove the shroud. I'll post my temps after doing the mod, but I would expect the same results as CBFR.
