Thank God the overheating threads may soon be a thing of the past. Recent mods appear to have practically eliminated overheating LLY's, improved ECT's, IAT's tranny temps and MPG's to boot.:)

Before we proceed with formalizing these mods with specific materials we need more intel from a larger sample of owners in order to ascertain these mods effectiveness. We know folks have done some of these mods, but suspect they haven't posted. We need your data folks! ;)

For the purpose of this poll the premise is that stack sealing, 3" OEM dam extension, plastic shield removal and cold air intake reduce ECT's, tranny temps and IAT's respectively. If you have data to the contrary please post a response and explain your mods and documented results. We're trying to get a feel for how many people have done these mods with positive results as well as to identify/resolve any outstanding issues. :exactly:

I'll ask one of the mods to cut/paste this same poll over to the LB7 forum since we suspect they will benefit from these mods as well. We need their intel as well. :D

Check all that apply. Since this is an intel gathering poll feel free to post variances to the poll, we know it is not all inclusive, moreso addressed to the masses. Thanks for your help. In the end all of us will have true muscle trucks that we can enjoy. Later. JJ :)

Add a second truck with good results for me! Can we have a place for fixed yes or no?

Rick,

Sorry, I didn't state it clear enough initially. Based upon our initial results the stack sealing, air dam extension, cold air intake and removal of the plastic shield mods are presumed to eliminate overheating, the exceptions to this should post and explain their mods and their data.

The other mods apply if they reduced/eliminated overheating. Just too many variables trying to ask the yes and no questions when limited to 10. :o: Some have posted that a reflash eliminated their overheating, not sure why/how, but apparently it did. :confused:

If we're not going to obtain the data we need with the way this is structured I'll modify it, but better hurry, only 15 minutes! ):h JJ :)

OK JJ, great job!

Partial frontal, pos flap, 3" oem, bug deflector, mike l cooler, water wetter, new fan clutch

never had any issues with my LLY, so i'm out

Cmon guys please participate if this applies to you. Also please state if you feel that the mods were worth wile!

Given the interest in the overheating threads we were hopeful that more than a handful of people would have completed some of the mods that we are running to ground. Perplexing! :confused:

I'm bumping this back up, maybe a mod can make it a sticky so it stays on everyones radar. In the end this data will benefit us all. Let's get er' done. vr/JJ :)

you will need to PM a mod to have it sticky for a few days. The poll is not on the radar

Well, I finished the partial seal of the front and the POS flap last night, then did a 6% grade climb in 4th at 65mph, the fan never came on:ro) , I will be installing an air dam today. The results are great.

Seald top & bottom & sides of the stack BUT not the lights & 3'' air dam. Cold air is next. Romoved the splash pan BUT will put back when it starts raining in november. Have not towed that much in the heat BUT Im
not wating. Trans temp has come down know more when I get in to 80/90 oat this week end.

Biggest and most gains so far was from splash guard removal. Sealed top and bottom of stack with alum. tape. Wait'n to find a suitable material for full stack seal! POS , used .080 plexiglass & alum tape. Removed tape at fender, some cold air for the intake. Galvanized .030 sheet FAB for temp. Ghetto shroud EXT. so far so good!

Used aluminium tape to seal between the top of the rad and the fan schroud. Attempted to seal down the sides between the Rad and the CAC with the tape. I will see if the tape holds up to the CAC heat. Pulling the grill with the brush guard on is not that easy, so I was not able to get the bottom sealed.

First impressions, 225* engine temps vs 235*+ prior to top seal and new fan cluch, with similar towing conditions. Looks like I will have to find the time to remove the brush guard and grill, to get the bottom and sides sealed up.

The bottom is the highest pressure zone, and the most effective seal area.

Don't forget the underhood area, the crack formed on the sides by the Rad and CAC, bad recirculation issue.

Anyone have some really good pics of the lower and side seal jobs.
Thanks, Ricky...seeya...

More folks appear to be doing mods. Please complete the poll if you've done any of the mods and eliminated or minimized overheating. If no positive results post and advise. Thanks. JJ

No mods done yet. Haven't pulled heavy(1800lbs) yet. Temp gauges always seem to be the same. Engine 210 to 215 Tranny 200 to 210.
Fan runs excessively,city or highway. If its over 92 degrees I got fan.
Alltitude is 6000ft to 11000ft.
I have removed rad cover and grill and have surveyed the area's of the stack that need sealing. I have held off on the sealing until a safe product has been mutually agreed upon. Although I am leaning toward hi Temp aluminum tape for a test and temp fix.
I thought I would remove skid plate and spash guard for my first test.
If I may, two questions please. I have read all the threads and I am not clear about the OEM extension.Since I have the a Sierra the posts all seem to refer to the Silverado. Are the part # the same?
I am also not clear with how to seal the POS flap and the headlights on the Sierra. If I missed the thread with pics please forgive me.
If this is the wrong place for these questions I will gladly delete.

Great place guys Thanks for your patience. :ro)

I too, am missing the information about the oem nose shroud. What should I ask for if I order this at the dealership? Does anyone have a picture of it?

There isn't an OEM nose shroud. All of them are homemade.

.

http://dieselplace.com/forum/attachment.php?attachmentid=7229&d=1123347697Nose Shrouds (http://dieselplace.com/forum/attachment.php?attachmentid=7229&d=1123347697)

My Chevy Shrouds. Stack sealing, Nose Shrouds and oem CAI, increased towing mpg 3-4 mpg. Temps no longer exceed 210, ever. Without a load, I haven't heard a fan in weeks, in 115 OAT's.

PLEASE

If you want information, please E-mail me. Every time I answer a PM, my computer locks up

How about a waiting for December to cool off check mark?

My Chevy Shrouds. Stack sealing, Nose Shrouds and oem CAI, increased towing mpg 3-4 mpg. Temps no longer exceed 210, ever. Without a load, I haven't heard a fan in weeks, in 115 OAT's.

KB, what are your before and after mpg numbers?

.

Tx, I'll tell you if you take my bet.

Tx, I'll tell you if you take my bet.

I was asking more for everyone else, as in what mpg to what?

What bet??????

.

KB, not again please. JJ :o:

Surely more than 26 people have done some mods???

Just completed my mods on Saturday but will not have any results till after Labor Day. "I'll be pulling up "25 mile hill"..varying grades of 3 to 6% pulling a loaded 33foot 5th wheel with 128 gallons of water,2 quads , a golf cart, and enuff fuel for our military for a day...+food and beer...Oh...and the wife and kids:o: ...Estimated 10K lbs.

Keep track of you mpg there "stallion".

Remember we need to do your cold air before you go.

ItalianStallion, 10k lbs sounds very conservative. Get er' weighed so we have that data as well. ;) JJ :)

I haven't pulled a whole lot with mine yet. But did hear the fan with slight load, only when I slowed down through small towns, flat ground slight head wind. Would aluminum plate work for these mods or does the material have to be flexable. Don't even have 3000 miles on her yet. ;) ;)

Personally I like the flexible "conveyor belt" material KB and others are using. Remember there is considerable turbulence and movement up front. Unless permanently affixed to the truck I would be concerned that a metal plate cut actually have a sawing effect on tranny cooler lines, CAC front, etc. Just my .02 cents worth. JJ :)

There will be more tow vehicles modified once the economy improvements that come with it are proven, with fuel prices where they are, and a 23 K load mpg of 8 mpg here in AZ, an additional 3 mpg should be expected with some good cooling and "true" cold air. That's money in the pocket.