HKS ECU

englishmike · 10-26-2009, 03:57 PM

I found this item on ebay. Does it replace the stock ecu, or is it a piggy back type ecu?

How does it work?

Used HKS Fcon ECU + GGC + Harness Toyota MR2 AW11 4AGZE:eBay Motors (item 290354273448 end time Oct-28-09 00:54:43 PDT)

MR JAS · 10-27-2009, 12:37 AM

appears to be a piggy back
non piggy backs rarely have wires sticking out piggy backs do

LeePeyton · 10-27-2009, 12:42 AM

I'm going to say piggy.
Beware of the older HKS units. They are hard to get exact numbers out of, so if you buy it and install be careful. I have a HKS VPC and I really just don't trust knobs.

englishmike · 10-27-2009, 10:29 AM

Whats the purpose of the piggy back ecu?

MR JAS · 10-27-2009, 02:16 PM

Quote:

Originally Posted by englishmike

Whats the purpose of the piggy back ecu?

basically it allows you to fine tune the factory programing without the hassle/expense of a standalone ecu

scottohno · 11-13-2009, 02:13 AM

can you put multiple piggybacks together?

q-authority · 11-19-2009, 01:28 AM

The main unit (F-Con) was a piggyback fuel controller that plugged inbetween the oem ecu and the engine wire harness. It simply modified the ecu injector pulses based upon information it got from a map sensor that was supplied with the unit. It only allowed you a general +/- fuel ratio across the entire rpm range, via a dashpot switch inside the unit. They supposedly had a few different chips that were designed for various levels of boost, but I have never been able to find much of any information on that, and HKS never said anything about it in the instructions that came with the units. They were built by HKS to use with either their 4age turbo or supercharger units, which they sold for a short period of time. Although, I am assuming that they could probably be used on non-forced induction engines as well, due to their simplicity.

The smaller unit (GCC) was an additional piggyback unit that plugged into the first unit (F-Con), and gave you finer control over the fuel ratio. It provided 6 set rpm points at which you could adjust the fuel ratio over something like a -5 to +10% range. For some reason HKS later changed it's adjustability to only 5 rpm points.

The same F-Con was most likely used for both turbo and supercharged applications, as they were labled with both types of induction on the front of the casing.

scottohno · 11-19-2009, 10:20 AM

really? im planning on getting cams soon and that would be quite fun

10-26-2009, 03:57 PM	#1 (permalink)
englishmike Some Skills Join Date: Sep 2009 Location: Birmingham, Alabama Posts: 85 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	HKS ECU I found this item on ebay. Does it replace the stock ecu, or is it a piggy back type ecu? How does it work? Used HKS Fcon ECU + GGC + Harness Toyota MR2 AW11 4AGZE:eBay Motors (item 290354273448 end time Oct-28-09 00:54:43 PDT)

11-13-2009, 02:13 AM	#6 (permalink)
scottohno control your hose Join Date: Feb 2009 Location: Fox Lake, IL Posts: 5,100 Thanks: 43 Thanked 93 Times in 83 Posts iTrader Rating: (7/100% )	can you put multiple piggybacks together? Last edited by scottohno; 11-17-2009 at 11:24 PM.. Reason: brain fart when writing original post.

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10-27-2009, 12:37 AM	#2 (permalink)
MR JAS Generous to a fault Join Date: Apr 2009 Location: hamilton new zealand Posts: 722 Thanks: 19 Thanked 17 Times in 16 Posts iTrader Rating: (0/0% )	appears to be a piggy back non piggy backs rarely have wires sticking out piggy backs do

10-27-2009, 12:42 AM	#3 (permalink)
LeePeyton Building Motor from Hell Join Date: Jun 2009 Location: Tennessee/USA Posts: 1,696 Thanks: 23 Thanked 67 Times in 61 Posts iTrader Rating: (2/100% )	I'm going to say piggy. Beware of the older HKS units. They are hard to get exact numbers out of, so if you buy it and install be careful. I have a HKS VPC and I really just don't trust knobs.

10-27-2009, 10:29 AM	#4 (permalink)
englishmike Some Skills Join Date: Sep 2009 Location: Birmingham, Alabama Posts: 85 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Whats the purpose of the piggy back ecu?

11-19-2009, 01:28 AM	#7 (permalink)
q-authority Professional Multislacker Join Date: Feb 2008 Posts: 506 Thanks: 0 Thanked 17 Times in 17 Posts My Google Map iTrader Rating: (4/100% )	The main unit (F-Con) was a piggyback fuel controller that plugged inbetween the oem ecu and the engine wire harness. It simply modified the ecu injector pulses based upon information it got from a map sensor that was supplied with the unit. It only allowed you a general +/- fuel ratio across the entire rpm range, via a dashpot switch inside the unit. They supposedly had a few different chips that were designed for various levels of boost, but I have never been able to find much of any information on that, and HKS never said anything about it in the instructions that came with the units. They were built by HKS to use with either their 4age turbo or supercharger units, which they sold for a short period of time. Although, I am assuming that they could probably be used on non-forced induction engines as well, due to their simplicity. The smaller unit (GCC) was an additional piggyback unit that plugged into the first unit (F-Con), and gave you finer control over the fuel ratio. It provided 6 set rpm points at which you could adjust the fuel ratio over something like a -5 to +10% range. For some reason HKS later changed it's adjustability to only 5 rpm points. The same F-Con was most likely used for both turbo and supercharged applications, as they were labled with both types of induction on the front of the casing.

11-19-2009, 10:20 AM	#8 (permalink)
scottohno control your hose Join Date: Feb 2009 Location: Fox Lake, IL Posts: 5,100 Thanks: 43 Thanked 93 Times in 83 Posts iTrader Rating: (7/100% )	really? im planning on getting cams soon and that would be quite fun