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Old 09-04-2019, 08:09 AM   #391 (permalink)
LCAC_Man
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Quote:
Originally Posted by Joey D View Post
Is it possible your grill is to restrictive?
I don't think so, I cut out all the factory plastic behind the billet, the only real blocker is the chrome band and the emblem(if the bumper had openings next to the license plate that would be a huge airflow improvement)...adding the pusher is really about getting the air conditioner performance up a low speed/idle, I can center the fan hub behind the emblem since it's a low airflow area anyways and not lose much natural flow. Returning the tune to the stock truck LBZ boost/fueling schedule will likely get rid of any of the higher temps while climbing grades, I saw 1100dg egt twice while it was in cruise pulling up a 7% grade at nearly 70mph, I don't think it should need to be that heavily fueled.
I'm really considering the DSP5 set up so that I can switch tunes on the fly, since I have the truck system it's an option for me.



As Duane mentioned the stock hardline PS loop/cooler isn't much for effectiveness, I'm going to cut into that and put a cooler with a dedicated fan, and I agree, switching to a good quality synthetic is just good practice.

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1976 FMC2900r LBZ/Allison Photo Album
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Last edited by LCAC_Man; 09-04-2019 at 08:23 AM.
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Old 09-04-2019, 06:44 PM   #392 (permalink)
Oregonnovaguy
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I wonder is swapping in a GMC grille would help cooling; it looks like it might have more open area.

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2007.5 Silverado LTZ / Z-71, 4x4, Crew Cab SB, Silver Birch/ Ebony Leather, , 150k + miles, , etc. Gearbox Z, Air Lifts
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My Other other Car: 70 Nova SS 350, 4 speed, posi, Fathom Blue, frame-off resto, original owner!
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Old 09-04-2019, 07:32 PM   #393 (permalink)
Joey D
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Quote:
Originally Posted by LCAC_Man View Post
I don't think so, I cut out all the factory plastic behind the billet, the only real blocker is the chrome band and the emblem(if the bumper had openings next to the license plate that would be a huge airflow improvement)...adding the pusher is really about getting the air conditioner performance up a low speed/idle, I can center the fan hub behind the emblem since it's a low airflow area anyways and not lose much natural flow. Returning the tune to the stock truck LBZ boost/fueling schedule will likely get rid of any of the higher temps while climbing grades, I saw 1100dg egt twice while it was in cruise pulling up a 7% grade at nearly 70mph, I don't think it should need to be that heavily fueled.
I'm really considering the DSP5 set up so that I can switch tunes on the fly, since I have the truck system it's an option for me.



As Duane mentioned the stock hardline PS loop/cooler isn't much for effectiveness, I'm going to cut into that and put a cooler with a dedicated fan, and I agree, switching to a good quality synthetic is just good practice.
Its hard to tell from the only picture of it but it does look to have less air flow than a GM grill. The trans cooler is massive as well, is it covering to much?
I like your thinking about holes in the bumper, especially since GM did it to the pickups.
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Old 09-04-2019, 10:16 PM   #394 (permalink)
LCAC_Man
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Quote:
Originally Posted by Joey D View Post
Its hard to tell from the only picture of it but it does look to have less air flow than a GM grill. The trans cooler is massive as well, is it covering to much?
I like your thinking about holes in the bumper, especially since GM did it to the pickups.
It might be a bit tighter but I think it really is about it not being that large and opening overall.
The trans cooler is much larger for sure (and definitely does the job) it probably is contributing to the low air flow over the condenser coil at low speeds. I think the pusher will solve that. I am going to add openings in the bumper, I looked at it again tonight and it really blocks a lot of free cooling air flow.
I'm convinced that the higher engine temps I saw at the tops of the largest grades/hotest days was a product of running a +80hp tune (on top of the truck LBZ tune). I did similair with my 06 LBZ truck a few years back, towing a 5000lbs trailer up the cajon pass with a predator 80hp tune it ran hot at the tops of the grades as well....did the same with the predator "tow tune" and it was about 20dg reduction in engine coolant temps.
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Old 09-05-2019, 05:24 PM   #395 (permalink)
Joey D
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Quote:
Originally Posted by LCAC_Man View Post
It might be a bit tighter but I think it really is about it not being that large and opening overall.
The trans cooler is much larger for sure (and definitely does the job) it probably is contributing to the low air flow over the condenser coil at low speeds. I think the pusher will solve that. I am going to add openings in the bumper, I looked at it again tonight and it really blocks a lot of free cooling air flow.
I'm convinced that the higher engine temps I saw at the tops of the largest grades/hotest days was a product of running a +80hp tune (on top of the truck LBZ tune). I did similair with my 06 LBZ truck a few years back, towing a 5000lbs trailer up the cajon pass with a predator 80hp tune it ran hot at the tops of the grades as well....did the same with the predator "tow tune" and it was about 20dg reduction in engine coolant temps.
Can you just run the existing fans at low speeds to make the ac work better?
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Old 09-05-2019, 07:50 PM   #396 (permalink)
LCAC_Man
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Quote:
Originally Posted by Joey D View Post
Can you just run the existing fans at low speeds to make the ac work better?
no, I've got large separation between my radiator and CAC and another pretty good gap between the condenser coil and CAC so even with the fans on high I just don't think (when setting still and it's 100dgs out) it moves enough air at the condenser coil, I've got plenty of room to add the pusher up there so it's not really that big a deal. I'm going to use a 17" Derale 2400cfm pusher, it's a 23amp load. I'm looking at ordering a 250amp alternator from: https://www.tucsonalternator.com/Par...AEPN=8292ND240
even with just the two taurus fans (when on high) I was pushing 70amps, which is fine at driving rpms but when you are setting at idle it pulled the voltage down a full volt to 13.8vdc, the hairpin style alternators with the big diode sets can push 110-130amps at idle rpms where the stock 160amp are rated closer to 60amps at those rpms.
Alternator upgrade was already on my "to do" list...I just ran out of time berfore the trip, I ran in "combined" mode with both alternators feeding both systems when I saw that the chassis alternator was struggling at idle and it brought it up .5vdc when I ran that way.
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Old 09-06-2019, 08:05 AM   #397 (permalink)
LCAC_Man
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Quote:
Originally Posted by Oregonnovaguy View Post
I wonder is swapping in a GMC grille would help cooling; it looks like it might have more open area.
I went back and looked at pics of the GMC grill and you (and Joey) are right, the GMC grill doesn't have that large band where the chrome strip comes across, that probably is a pretty serious air blockage on the chevy version...I may put that on the list, IDC what emblem I'm running on the front!
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Old 09-06-2019, 09:37 AM   #398 (permalink)
ShopSpecialties
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I have thought about cutting out the whole center of the grill and installing a stainless steel mesh. There are several designs to choose from and I do not think it would be to difficult.
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Old 09-06-2019, 12:48 PM   #399 (permalink)
LCAC_Man
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maybe use a couple of these:
https://www.backtoboating.com/produc...louvered-vents
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Old 09-06-2019, 01:52 PM   #400 (permalink)
Oregonnovaguy
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Sometimes getting more air out is as important as getting more air in. On my truck I added a flexible air dam in-line with my core support to create a little high pressure in front and a little low pressure behind my stack.

__________________
"Tolerance becomes a crime when applied to evil" Thomas Mann
If you can live amid injustice without anger, you are immoral as well as unjust. -St. Thomas Aquinas
"When any nation mistrusts its citizens with guns, it is sending a clear message. It no longer trusts its citizens because such a government has evil plans." - George Washington -

2007.5 Silverado LTZ / Z-71, 4x4, Crew Cab SB, Silver Birch/ Ebony Leather, , 150k + miles, , etc. Gearbox Z, Air Lifts
Montana High Country 310RE
My Other other Car: 70 Nova SS 350, 4 speed, posi, Fathom Blue, frame-off resto, original owner!
Previous Trucks: '03 Silverado CC gasser 4x4, '99 Sierra Ext. Cab 4x4, '77 Dodge Power Wagon 4x4, '76 Datsun 620.

Read the DISCLAIMER in my garage.
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