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which ECU
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bass gt  



Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!

PostPosted: Thu May 01, 2008 9:44 pm    Post subject: Reply with quote

Raceboy wrote:
Pectel SQ6 is used by MANY professional motorsport teams and is truly hi-end ECU.


Indeed. mine came from a British GT car. It seems the next step up is going to the LeMans spec ECU's where you are looking at $20K!!!
From what i can see, the difference between the Motec M800 or Pectel SQ6 range of ECU's and the sub$1000 ECU's is the quality of the chipsets which run the device. The Pectel uses a twin setup, so 1 chip is dedicated to timing. Apparently, the timing is accurate to 0.25 of a degree at 10000rpm!! You then have the overall developement of the ECU, which really yields results. Take Simon (Simsport) as an example. When running an economy type Emerald ECU, the car ran well enough, but by switching to a Motec M4 serious power was found almost everywhere in the rpm range. This is soley due to the accuracy of the Motec in terms of spark and fuel control. I think just those power returns alone justify the cost. If an engine has had many thousands spent in terms of new componentry, rods, pistons, ect ect, then the brain should be as good. I think spending large amounts on the mechanicals and ignoring the value of a quality ECU is incredibly short sighted. Yes, they do cost more, but if power and performance is the goal, why go cheap on the most important device on the car???

Steve
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Raceboy  



Joined: 01 Mar 2004
Posts: 2327
Location: Estonia, Europe

PostPosted: Fri May 02, 2008 5:17 am    Post subject: Reply with quote

Price of the ECU almost always tells you the benefits of it, but not always. Accuracy is dependant on the CPU power and thus it's ability to interpolate betweeb loadsites. This is what makes the ECU good: having the capability to "create" loadsites.
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Pieter  



Joined: 06 Mar 2008
Posts: 53
Location: South Africa

PostPosted: Sun May 11, 2008 6:34 pm    Post subject: Reply with quote

I looked at MS, but found that VEMS work out much cheaper, having two onboard WB O2 controllers, you just have to provide the sensors (ie no need for innovate LC1 or the likes). The whole conversion will cost me less than $200, but then someone else paid for my controller. Which reminds me, I also have a MSII v2.2 lying around somewhere...

VEMS is also more like a MS sequencer. Has knock sensor input, up to 8 individual spark and injector outputs, and tons of other great features. I see little point in putting a $4k ECU on a $2k car. Of course, it is also possible that paying $4k for 20 hp is worth it to you, but probably not for street application.
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