GM "hot fire" coil packs
 

I saw this on an online ad and it mentions gm "hot fire" coil packs. I've never heard of these and my google search comes up with nothing. Here the text of the ad-

"This motor is a 5.3 Liter LS1 style V8 out of a 2002 Tahoe Z71, and is ready to drop into your performance muscle car or replace the tired motor in your 99-06 Chevy / GMC truck.

The 2002 Tahoe was the last year for mechanical throttle body. The ease of modification with mechanical throttle body makes this motor a great budget option for your LS1 swap.

This particular motor was the Higher performance 315hp rather than the more common 289hp 5.3. The 26hp comes as a result of the 32lb EV6 fuel injectors(as opposed to 22lb) and the GM "hot fire" coil pacs.

With Ecm tune, this 5.3 is capable of around 350hp. This motor responds very well to aftermarket camshafts with little mods due to the 32lb fuel injectors, making it able to achieve over 400hp with a cam swap."

Is this legit for 26HP or smoke and mirrors? It just looks like a truck 5.3 to me. I don't know what "LS1 Style" means.

Re: GM "hot fire" coil packs
 

He is smoking crack, Most SUV's use Delco coil packs, They are round & have heat sinks on them, Pick-ups generally use square Mitsubishi coils. However I have seen SUV's with square coils & Trucks with round coils

One is not better than the other.

Re: GM "hot fire" coil packs
 

Here is text from another ad he is running for a separate engine:

"This particular motor was the Higher performance 315hp rather than the more common 289hp 5.3. The 26hp comes as a result of the 32lb EV6 fuel injectors(as opposed to 22lb) and the GM "hot fire" coil pacs. These were factory options that allowed this motor to run E85 but will run much more efficiently on gasoline."

Re: GM "hot fire" coil packs
 

He is definitely a Tool,

Flex fuel 5.3L (L59) engines have bigger injectors because E85 requires more fuel volume compared to regular gasoline, Powerwise they are rated the same as run-of-the-mil LM7's.

The only "HO" version of the 5.3L is a L33 all aluminum engine (310-315 hp) depending on the day of the week & how many beers you have had.

Re: GM "hot fire" coil packs
 

:lol::haha:

Re: GM "hot fire" coil packs
 

The coil packs you have are better than the old square ones. Yours have heat sinks on them. Your motor is rated at 305 hp I believe.

Re: GM "hot fire" coil packs
 

That isn't my motor, its the "High Performance" one he is selling with snake oil. It's a pretty good clue when Google Search doesn't turn up anything on Hot Fire coil packs :smoke:

Re: GM "hot fire" coil packs
 

There's no proven gain with the round versus square coils, they are the same performance wise.

The guy sounds like a used car dealer, theyll say anything to make what theyre selling sound better.

Re: GM "hot fire" coil packs
 

There are some articles on LS1tech about the D581 truck coils with the heatsinks on them making more power. There was some site that did a test and said they should give you more, but I have never seen a Dyno comparing them.

Re: GM "hot fire" coil packs
 

Hot coil packs is like selling snake oil. As a past ase dealer mechanic the coil doesn't dictate output, the engine load, cylinder pressures, etc, do. After all of my training i look at it like this: you can put a million volt output coil on your engine and you won't see a million output. Now if you put an undersize coil for the application at hand it wouldn't last long. Properly designed electrical equipment needs to have a reserve margin built into it, you never want to ask for 100% output. I used to laugh at my buddies in the 70's bolting on their huge coil and think their car went faster now! Just an fyi oem's went to individual coils to enable firing on the compression stroke as well as the exhaust stroke (emissions) and the added benefit of longer coil saturation time, good for higher rpm's. The buick grand national i believe was the first gm with distributorless ignition and that was a huge leap forward, especially as far as emissions was concerned. Just some facts rattling around in my old head that i like to share.

Re: GM "hot fire" coil packs
 

I'm lol'ing in my chair. What I like is that he "knows" the injectors ...but he still gets the stock flow rates of the old injectors wrong (~25lbs)

I also don't know what other injector he claims they have, but my guess is the 8.1l marine (or maybe just the regular 8.1), which is 30-35lbs and still uses the GM delphi connection.

Of course none of these would just "pick up" power, and the ECM would have to be tuned to run them without running like total dogsh!t.