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Old Guy
08 Trailblazer SS
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297 Posts
You are right about the concept of probes. Just seems like a quick fix type of thing. But you can't argue with how well they work for the both of you.

I'll see what Hayden says and go from there.

Putting a sensor in the head was going to be my excuse for changing the plugs.
I may have to find a new reason to change them now.

Been putting it off because of what I've read about changing them but eventually I will have to do them.

The max current draw of the controller is 30 amps. I don't know what my fans draw, but from what I read they can pull 4000 CFM each and I'm pretty sure they would draw more than 15 amps. So will probably have to go with two controllers. With the discount I have that's about $124 for the pair.



Was going to go out and do a few things to her today, but it's 102 degrees and that pretty much shut me down.


Edit: Just found this. The Hayden sensor is 3/8" NPT. It won't screw directly into the temp sensor hole in the head.

https://www.summitracing.com/parts/hda-355
 
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Old Guy
08 Trailblazer SS
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297 Posts
I just found this on an S10 forum about LT1 fans.


"The fans run together draw 57 amps for a split second on start-up, then continuously draw 13.6 amps while running at 100%. During AC operation and running at 60% they only draw 10.6 amps"


When they both come on with the AC they would pull max amps on the controller when I hit the AC switch.

I guess the way I look at it is if I buy one control and blow it I'll then have to buy two of them and end up paying for three total.

Rather buy two now and be done with it and not lose the controller when I really need it.
 
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Premium Member
TrailblazerSS
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1,490 Posts
Why not just use the hayden controller to energize a relay for the second fan? Then you would only need one controller. I'm using my controller to activate a 80 amp relay that controls power to both of my fans.

Sent from my E6810 using Tapatalk
 

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Premium Member
Trailblazer SS
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1,036 Posts
Discussion Starter #44
Why not just use the hayden controller to energize a relay for the second fan? Then you would only need one controller. I'm using my controller to activate a 80 amp relay that controls power to both of my fans.

Sent from my E6810 using Tapatalk
That would defeat the purpose and you wouldnt have PWM control.
 

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Premium Member
TrailblazerSS
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1,490 Posts
That would defeat the purpose and you wouldnt have PWM control.
Guess I should've read more. I don't have that setup. I have the regular Temp control. Mine kick in on full blast at whatever set temp or a.c. on. Electric motors tend to last longer when used at full speed. Plus, the spall fans that come with the fsr shroud don't make nearly as much noise as other aftermarket fans I've had. In fact, I have to listen for them to hear that they are on. Anyway, I'll try and read more next time before I butt in!

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Premium Member
Trailblazer SS
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1,036 Posts
Discussion Starter #46
All good man. Hope I didn't come off sounding like a dick.
I misread all the time.
 

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Premium Member
2008 Trailblazer SS
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2,764 Posts
Slightly off topic, but has anybody switched out the 12" spal fans that come in the PCM kit? I remember an old thread on this but don't recall an update. I know those fans are high flow but wasn't sure if spal makes a high-er flow model.


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TrailblazerSS
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Slightly off topic, but has anybody switched out the 12" spal fans that come in the PCM kit? I remember an old thread on this but don't recall an update. I know those fans are high flow but wasn't sure if spal makes a high-er flow model.


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I run Spal 30102044 13" Curved Blade fans on a Mighty Mouse shroud. Utilize the PCMofNC harness. You definitely hear them when on at 100%. I'm unsure if they would fit the PCM shroud.




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Old Guy
08 Trailblazer SS
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297 Posts
Well I got reply back from Hayden this morning. I wasn't expecting this form them.

Have to think about this some now.

------------------------------------------------------------------------

Hello Dan,

Thank you for contacting Hayden.

At this time I cannot recommend converting to electric fans. Our 3655 controllers can only handle up to 25 Amps and the Camaro motors require 40Amps each.

Thank you,

Jason Knight

Hayden Product Analyst/Specialist

SMP_Temp_sm

1801 Waters Ridge Dr.

Lewisville, TX 75057

[email protected]
 

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Premium Member
Trailblazer SS
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1,036 Posts
Discussion Starter #50
I have been using the same Hayden 3655 PWM controller with LT1 fans for 6 months. Have had no issues in the wonderful cool Texas summer so far. The controller works great, in the spring, the fans would come on at low speeds, in the summer, the fans run constantly as the controller has an input from the a/c compressor. Have the probe in the radiator core and can adjust the turn-on temp. I would recommend this controller to anyone who runs e-fans and wants soft turn on.
That IS an interesting response...
40 amps max seems realistic if they were going from off to full speed on a relay, but this guy is using them so IDK...
Since they "soft start", I dont think thats a realistic number...But who knows.
 

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Old Guy
08 Trailblazer SS
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297 Posts
I had seen that post before and didn't think there would be any problems running my LT1 fans.

But it's hard to argue with Hayden. They make the product and know exactly what fans I have and know what their product is capable of.

Going to have to do some more research on this. I don't want to install something that I know will eventually fail. It's not about the money, but with my luck they would fail on a 100 deg day and I'd be stranded. Wouldn't be an easy roadside fix either.

Damn, I thought I had everything lined out and was hoping to do it all this weekend.
 

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Premium Member
Trailblazer SS
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1,036 Posts
Discussion Starter #52
Can't disagree with you on that one. Do you have a way to check current draw on your fans?
 

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Old Guy
08 Trailblazer SS
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297 Posts
I checked my Fluke multi meter and it only goes to 10 amps, but it's not clamp on.

I have an old clamp on meter but it's only ac amps, ac volts, and dc volts.
but no dc amps.

I'm doing some checking. I have a buddy that's an electronic genius. I'm sure he would have a way to measure the amps.

He helped me rebuild my CNC mill.

Edit: I was looking at this before the Hayden controller. Says 40 amp fuses. It can use a stock temp sensor to control both fans.

http://www.entropyrad.com/dual-fan-programmable-controller.html

Says
 
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Old Guy
08 Trailblazer SS
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297 Posts
I talked with entropy about their controller and same story, too many amps.

So I called Derale and had a long talk with the tech guy. He said my fans at max will pull 32 amps st startup but their controller never does a full power start. Goes on at 60% and ramps up from there.

I asked about the AC override and they start at 60% full time while they get an AC signal. I'm assuming they will ramp up to 100% if needed.

He said they only use a push in sensor or one in the radiator. Gave me a long technical explanation as to why, a lot of it went over my head and don't remember the rest of it. Sounded good though.

Unless I can find something better I will probably give the Derale controller a try. I hope to still be able to do everything this weekend.


https://m.summitracing.com/parts/der-16795
 
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Premium Member
Trailblazer SS
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1,036 Posts
Discussion Starter #55
I was eyeballing that controller too before I went with the Hayden. Let us know how it works out! It's good to have options.
 

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Old Guy
08 Trailblazer SS
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297 Posts
I will definitely post about how it goes. I ordered the controller from Summit a couple of hours ago and already got a tracking number. They are great.

I need to make up some brackets to mount the LT1 shroud to my radiator. I'm lucky that I have my old radiator to use for fit up.

I'm still planning on mounting the controller in front of the battery. I may mount on it's side vertically on a piece of 3" aluminum angle I have instead of mounting it flat. That way I have more room for other things that may be added later.

Never know what I'll come up with to put there. If I keep looking here I'm sure there will be something I can't live without :D
 
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Old Guy
08 Trailblazer SS
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297 Posts
The controller came in today. Nice looking unit. The power and ground wires are 10 gauge.

It's going to fit well in the space I created by moving the horns.

I tapped off relay #44 for the AC signal. Used mini fuse taps from Napa. Had to modify the tap a little, but fits well now.

I'm going to get all the wiring done first then work on mounting the fans. Started making some brackets to mount the fans to the radiator. So far so good.

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Premium Member
Trailblazer SS
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1,036 Posts
Discussion Starter #58 (Edited)
Looking good!
Interesting.. Your fuse box looks different than mine. Guess there were some changes between 07 and 08.
 

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Old Guy
08 Trailblazer SS
Joined
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297 Posts
Yes they do look different.

Are you running with the cover on the fuse box? I'm trying to figure out how to get the trigger wire for the AC override out of the box and still have the cover on.

The only way I can see to do it is drill a small hole for the wire to go through. I would like to keep the cover on.
 

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Premium Member
Trailblazer SS
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1,036 Posts
Discussion Starter #60
Yeah I drilled a hole for the trigger wires and used a spade connector to connect them.
 
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