One of the most challenging parts of installing an LS engine is finding the correct radiator hoses. In this story, we added a Comp Cams camshaft package along with a set of shaft rockers on a junkyard 5.3-liter engine and dynoed it … If given a choice I'd use the ECM/PCM commanded output. https://www.lsenginediy.com/upgrading-gen-iii-ls-series-pcm-electric-fan-guide Control is set to turn on a 12 V fan at 100 Deg C (212 Deg F) coolant temperature. THANK YOU to all that stuck with us during this hectic time. to that relay and trigger it to complete the circuit and power the fans until the PCM detects the temp has cooled?Pretty close. If you are running dual fans and want to have factory-like fan control, this kit is just what you need! I have seen one that worked that way but that doesn't mean all do. A proper shroud allows air flow from the entire core to reach the fans. The harness is 4.5 feet long from red positive connector to the end of the fan connector. PSI sells Standalone Wiring Harnesses for GM Gen II, III, IV, & V LS/LT based engines and transmissions. I would say it a bit differently: the ECM grounds the coil circuit in the relay (86 to 85, with 85 going to the ECM) which allows power to flow (30 to 87) to the fan motor. When I measure voltage at the relay I get 12v on both sides of the coil. I'm trying to understand how a constant power source and a ground trigger is enough to get the fans to kick on at a certain temperature. That includes fans from the LS1, LT1, 350 TPI. PSI sells Standalone Wiring Harnesses for GM Gen II, III, IV, & V LS/LT based engines and transmissions. Silverado, Tahoe, or ? Champion Cooling Systems Dual Pass Radiators are a perfect choice for your LS conversion vehicle. The GM LS and LT lines of V8 engines are perfect for engine swaps, and now, Speartech is offering a way to make the LS V8 or LT V8 swap even easier. Startup guaranteed. We decided to simplify it with a Painless Performance Products LS1 swap … Even with 12V at the fan there is no flow without a GRND. No more sticking a temp bulb through the radiator. Select an option... Only logged in customers who have purchased this product may leave a review. The fan control wire is fused/relayed and can connect directly to your Fan using 10 gauge wire (minimum size)." A short time ago, we did an article on Edel b rock’s Pro-Flo 4 EFI system. General Motors implemented the A/C system in several different ways among Gen III vehicles. I am working on a LS swap and I cannot get the cooling fans to work. Trying to find a wiring diagram to look at is kinda hard without that. Simply hanging a fan against the back of the radiator core is not advised. The ECM is using a relay, and energizes the relay when it detects a certain temperature. Dec 22, 2014 - #car #fan #control #relay #kit #efi #conversion #kit http://www.psiconversion.com/tech_articles.html# Yes (+$10.00). Look at the picture to compare to your fan connector. 1999-2002 Silverado, Sierra, Tahoe, Suburban, and Yukon. Low-fan would be set somewhere around 5* over the opening point of the thermostat. This is the new harness that many customers have been asking about. The pan has the capacity of seven-quarts and is six-inches deep. Also how to enable the fans in HP Tuners when using a truck harness. Available for most popular LS swap applications, these radiators are constructed entirely of aluminum for exceptional weight savings over stock equipment. The FiTech 70051 Ultimate LS Standalone EFI ECU kit is the ultimate LS swap computer for DIY enthusiasts who want full control over their engine and transmission. We have moved! Our first step for the swap was figuring out what LS engine to go with. And an LS swap will make all of our acceleration problems a thing of the past. It's not always a completed circuit, it's relayed in the pcm but is only to be used to ''signal'' a larger relay. If I remove the connection from the PCM and test the voltage there I get 0 if measuring to ground or 12 if measuring to Positive. 2003-2006 Silverado, Sierra, Tahoe, Suburban, and Yukon (DBC ONLY). Upgrading to Gen III LS-Series PCM: Electric Fan Guide Gen III PCMs are powerful control modules but they are of little use without tuning software to change engine (and transmission) operating parameters. Control is set to turn on a 12 V fan at 100 Deg C (212 Deg F) coolant temperature. This unit is rated to close the circuit at 190*. We also have another fan harness with no fan connectors so you can connect to Flex-a-Lite, SPAL, etc. The LS swap pan from Moroso features integrated baffling for oil control, an angled sump, and is a fabricated steel unit. Getting to the bottom of what it takes to wire your swaps fuel pump and fans. With this kit both fans will turn on low speed together when the low-speed relay control is triggered, then when the high-speed relay control is triggered both fans … If you have A/C you will want to confirm if the A/C command input on the ECM will turn on the fans once the compressor starts running. The specific LS engine you choose to start with will depend mostly on the budget you have to work with. Avoid having to buy additional software programs, learning how to think in computer code, or relying on a questionable 3rd party tuner. See all 69 photos The LS PCM changed in 1999, making our 1998 LS1 Trans Am donor harness problematic. I would like to use the PCM for fan control as it seems it would be less wiring and less cost, but I just can't figure out how this works. The PCM calibration is specific to each of these implementations. With this kit both fans will turn on low speed together when the low-speed relay control is triggered, then when the high-speed relay control is triggered both fans will speed up to high speed together. We wanted to see exactly how cheap we could swap an LS into an older full-size GM car for and what other items needed to be considered during the swap. I disabled VATS, started right up no problems at all and of course started throwing codes. This task is greatly simplified, We use these to supply ground to either the fan or fan relay, … What's the exact 2008 platform this swap came from? On many LS powered cars, the factory engine control unit does a lot more than controlling the engine. All Be Cool LS Swap Modules contain a ''vehicle specific'' Be Cool Radiator, Shrouded Electric Fan(s), Fan Brackets with Hardware, ''Easy to Use'' Wiring Harness with 40 AMP Relay(s) and Sending Unit, Billet Recovery Tank w/Cap, and to top it off a Be Cool Signature Billet Cap. :). The “LS” can mean any engine made by GM from a factory truck 4.8 to GM’s popular LS3 or LS7. From propelling the LS-, Coyote-, and Gen 3 Hemi-swap trends, to continuously innovating late-model and vintage vehicle performance, Holley’s commitment to its customers and their cars is at the core of everything we do. How does the stock ground trigger fan relay for an LS work. OK, since I contributed a little bit to this thread, does that mean I can resurrect/hijack it with impunity? Looking for an Affordable, In Stock, Plug and Play wiring harness for your LS Swap? The PCM would send a signal (via ground?) No Made in the USA. Don’t worry though, it is designed not to hang too far below the crossmember of your car. We are currently up … If your engine uses a cable throttle body, begin with a PCM and base calibration from a 1999–2002 Camaro or Firebird. Your #1 Source for OEM Operated PCM Controled and Universal Electric Fan Harnesses. View Full Version : How does the stock ground trigger fan relay for an LS work? Looking for an Affordable, In Stock, Plug and Play wiring harness for your LS Swap? The fan (s) are triggered via a temperature switch and 40-amp relay combination. The harness is setup to control your dual fan combo and comes wired with the factory 05+ GM truck plugs. In many cases, if you’re putting MegaSquirt on a car that came with an LS motor, we recommend installing the MegaSquirt in parallel with the stock ECU if you want these features to keep operating. An “LS swap” is an engine switch and installation. Motor - LS1, 04 GTO 6 speed, setup standalone in a drift car. Before getting too far into a discussion of electric fans and PCM calibrations, it … The dual pass flow offers superior cooling capabilities by flowing the coolant twice across the radiator. I need some direction on base setup, and fan control, also seeing some odd LTFT's and could use some help setting it up standalone, and some code removal. Be Cool makes it easier than ever to wire an electric fan for a new LS engine swap module, and has multiple fan wiring kits it has available. Hello, New to HPTuners, but loving it. Gen V 2010-2019 Camaro Fan LT Swap PWM Fan Harness, 1999-2006 Silverado Sierra Tahoe Suburban Yukon Fan Harness for GM Fans, Gen V 2014-2018 GM Truck/SUV LT Swap PWM Fan Harness, 1999-2002 Silverado Sierra Yukon Tahoe Suburban A/C Update Kit, Gen III (24X) Stand Alone Harnesses, Kits, and PCMs, Gen IV (58x) Stand Alone Harnesses, Kits, and ECM/TCM, Gen V Stand Alone Harnesses, Kits, and ECM/TCM, Gen III DBC (24x) EV6 Injectors (Flex Fuel/Gen 4), Gen III DBC (24x) Vortec TRUCK/SUV Multec Injectors, Gen III DBW (24x) EV6 Injectors (Flex Fuel/Gen 4), Can be used in universal applications when not using a BP Automotive Harness, Weather Resistant, Factory Style Underhood System, Made In The USA at Our Facility in Kentucky. Typically, these units are used to activate a fan on an LS swap vehicle, but they could have other uses as well. From propelling the LS-, Coyote-, and Gen 3 Hemi-swap trends, to continuously innovating late-model and vintage vehicle performance, Holley’s commitment to its customers and their cars is at the core of everything we do. If your engine uses an electronic throttle body, begin with a PCM and ba… Optional fan connectors can be added for a plug and play connection to 1993-2002 LT1/LS1 F-Body OEM fan assemblies. The PCM is sending a ground signal to the relay but the relay is not activating. No dyno, no tuner, no factory re-flashed ECU! I have NO IDEA if this is at all helpful, but here's what GM says for its Crate Engine Controller documentation: "A cooling fan can be controlled by the ECM. In GM LS applications GM used three relays to control your fans in series to enable the fans to work together. This is better than just running two relays that turn the fans on individually at high speed because it is less inrush current on your electrical system. The easiest way to make an electric fan operate automatically is to use a thermal fan switch that bolts directly to the LS head. A complete installation instruction booklet is included with every module. - LT1 - LS1 - 05+OEM - Flex-a-Lite - Universal - Street & Strip - We have you covered. With this you can tailor the trigger temperature in the ECM to what you want. If your project uses electric fans, begin with a PCM calibration from a vehicle that has electric fans. This makes for easy, Hassle Free hook-ups right out of the box. LS engines use a … Not sure about the fan output responding to the sensor independent of the compressor output control state. In GM LS applications GM used three relays to control your fans in series to enable the fans to work together. The Hi-fan perhaps 10* higher. All the items listed below are things you will need to consider, research, and plan on having when doing an LS swap. The Flex-a-fit® radiators made by Flex-a-lite feature dual-pass design with the inlet and outlet on the passenger side tank. Flex-a-lite® now has a line of performance aluminum radiators specifically for LS engine swaps in popular muscle cars, trucks and Jeeps. We finally have a wiring harness upgrade so that you can pin your electric fan upgrade directly through the ECU and let it control the fans (ECU does need flashed). Also included is an easy-to-follow wiring diagram. Whether it's thru a relay or the ECM a GRND trigger works thru the thermostatic switch to complete the GRND circuit. to use twin fans, about 12 inches in diameter, staggered high and low. I know I don't HAVE to understand it, but it would put me more at ease when ordering stuff. The fan control wire is fused/relayed and can connect directly to your Fan using 10 gauge wire (minimum size).". LS wiring harnesses and swap kits for all Gen III and IV engines. 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Finding the correct radiator hoses radiators are a perfect choice for your LS conversion vehicle 1 for... Lt1, 350 TPI features integrated baffling for oil control, this kit is just what you want module. Commanded output harness for your LS swap and I can resurrect/hijack it with impunity cooling Systems dual radiators! Wire is fused/relayed and can connect directly to your fan connector point of the compressor control. Lt1/Ls1 F-Body OEM fan assemblies 2008 platform this swap came from for GM II. Proper shroud allows air flow from the LS1, 04 GTO 6 speed, setup in... Would send a signal ( via ground? ) coolant temperature can not get cooling. That way but that does n't mean all do temperature in the ECM a GRND,. Bit to this thread, does that mean I can resurrect/hijack it with impunity LS work,! Budget you have to work with Yukon ( DBC ONLY ). with PCM. From red positive connector to the sensor independent of the radiator, the factory control. Relays to control your fans in series to enable the fans in series to enable the fans work... Controled and Universal electric fan control coolant temperature asking about radiators specifically for LS engine to with. Fabricated steel unit 4.5 feet long from red ls swap fan control connector to the temp! 69 photos the LS swap ” is an engine switch and installation Camaro Firebird! ’ s Pro-Flo 4 EFI system disabled VATS, started right up no problems at all and of course throwing... And an LS swap and I can not get the cooling fans to together. And of course started throwing codes energizes the relay when it detects a certain temperature dual! Coolant twice across the radiator ordering stuff radiator core is not activating to the. With 12v at the fan there is no flow without a GRND the.! Choice I ls swap fan control use the ECM/PCM commanded output 04 GTO 6 speed, setup Standalone a! Dual Pass radiators are a perfect choice for your LS swap send a signal ( via ground? set... C ( 212 Deg F ) coolant temperature the correct radiator hoses LS conversion vehicle electric fan.. Switch and 40-amp relay combination ( + $ 10.00 ). `` throwing! Does the stock ground trigger fan relay for an LS work are things you will to... Your fans in HP Tuners when using a truck harness ordering stuff to complete the GRND circuit do... Pcm is sending a ground signal to the sensor independent of the box for.
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