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Old 09-29-2003, 06:48   #1 (permalink)
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Engine computers

Got my car back from the mechanics today (where it's been for the past week) and they have told me I need aftermarket engine management, like a Unichip. The reason for this is because the car is running WAY to rich because of the stage 3 cam. They told me the car has 14 inch pounds of vaccum at idle instead of the usual 21....if that means anything to anyone???? They also said the MAP sensor is basically doing nothing now because the cam's taken it out of it's range and the engine is running on 'factory preset' fuel maps which are far from ideal.

So I was wondering if anyone can recommend any brands of engine computers or if they have had experience with the aftermarket gear. I was looking at getting a Unichip but have heard a mixed response on whether they're any good or not. Wanna get this done ASAP so any help would be great.

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Old 09-29-2003, 08:16   #2 (permalink)
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Re: Engine computers

Unichip are the best of that type of chip. Others will tell you to go Wolf3d, HALTECH, or some other types of adjustable piggy back computer. It all comes down to the flexibility you want (and how much you want to pay).

As far as the programmed, plug-in chips go, Unichips are still good - just don't get them confused with Powerchip, and I haven't really heard either way about Chiptorque chips.
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Old 09-29-2003, 16:47   #3 (permalink)
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Re: Engine computers

You could also try an XR6 ECU - I know for certain that they are far more tolerant of poor idle vacuum (ie. seem to still be within a "working" range) so presumably also are ok from there up?.

You should be able to find one for something like $200 to $250 - but be careful to try and get one that's definitely out of a sedan - else you might end up with a 160/170 kph speed limiter if it's out of a ute or wagon. If it's an auto then the XR6 ecu will be programmed for 3.45 diff ratio - but even with a 3.08 diff the effect won't be too radical - you'll find in economy mode it's maybe a tad reluctant to kick down and might tend to change up sooner than it should - in power mode tho it should behave like it used to in economy (shifts at normal points etc.).
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Old 09-29-2003, 17:17   #4 (permalink)
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Re: Engine computers

He has a 5 speed anyway. He'd need to get a non smartlock non integrated trans if it were an auto or not.

Leaves a window of 2/92 - 10/92 of ecu'savalible he can use so the chances of findng an xr6 manual in that time indow are slim.
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Old 09-29-2003, 20:00   #5 (permalink)
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Re: Engine computers

Ahh - ok - yep, in that case a Unichip or plug in module might be the go then.
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Old 09-30-2003, 01:59   #6 (permalink)
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Re: Engine computers

Basically as the vaccum goes down the computer thinks the engine is now under load, its the larger cam is causing this. The computer then is dumping in excess fuel, even the std amount of fuel at idle is usually too much with a larger cam.

The unichips is light years ahead the plug-in chips. This is because they are tuned when they are installed. I wouldn't touch the Wolf3d with a 50' pole! Its like going from a calculator to an abacus.
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Old 09-30-2003, 02:26   #7 (permalink)
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Re: Engine computers

co-incedentally i have a EB XR6 computer up for sale, manual, no smartlock, 10/92, though it has issues - at full throttle at the moment it pours in fuel like you would not believe - 10:1 air/fuel ratio instead of about 12:1. i have a thread running in the general tech section atm, though thinking about it now i think i should have put it in the I6 forums...
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Old 10-01-2003, 07:41   #8 (permalink)
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Re: Engine computers

Unichips are rip offs and basic pieces of hardware and software. I'd go with the new exede for piggy back or the new EmS 8860 for full programability. I'm currently putting in an ems 8860 into a EA MFI at the moment. Its a full plug in affair, should be ready in a couple of weeks as just doing it in my spare time
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Old 10-01-2003, 18:15   #9 (permalink)
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Re: Engine computers

Anyone got any rough prices to go with these Chips?

Simon.
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Old 10-01-2003, 23:15   #10 (permalink)
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Re: Engine computers

$1.50 for a standard scoop of chips at the takeaway down the street. Hope this helps.
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