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Old 05-12-2013, 06:58 PM   #41
Ice88
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Yeah.

I'm kinda sortta anal about this stuff so prolly not the best person to use as an example for this.

You'd get changed out of 500. Specially if you didn't pay the core surcharge.
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Old 10-12-2013, 10:34 AM   #42
danbowe84
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So heres a what if, say if I don't change crank angle sensor and trigger wheel or cams or sensors or anything, just plug it in and crank it over will it not start or start and timing and everything will be out could it do damage,does the computer have timing maps and everything with no ability to compensate?
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Old 10-12-2013, 10:53 AM   #43
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it won't start and even if you did get it to start, it'll run like **** and stall once you try to rev it

the ECU just doesn't know how to deal with the different signalling
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Old 10-12-2013, 02:43 PM   #44
danbowe84
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But if I had an aftermarket ecu that wouldn't be a problem would it
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Old 10-12-2013, 05:01 PM   #45
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there would be if nobody knows the signal profile and be able to build a working basemap for you to get the motor running
it will take a lot more time to build one from scratch
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Old 11-12-2013, 01:24 AM   #46
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It would still idle and sort of run for a bit - depending on how much or how many changes you made.

If you just refreshed the bottom end and decamped the pistons. It should be okay as long as all sensors are connected to run with a turbo unit - but don't hook it up run it N/A to a dyno shop or tuner to installed a ECU etc. Thats been done before it's just a PAIN in the arse we did it at night time. because your max speed is like 50km/h in 4th. depending on your turbo size and stuff. But even so better off trailering it.

If you had base map in a Aftermarket ECU etc if can be enough to run it to a dyno but - depending on how you look at it - Might not be worth the risk.


One thing I do want to point out - You can Piggy back a aftermarket ECU onto a stock ECU to run a turbo engine. The problem is it's more complicated then letting the aftermarket ECU run the whole show. It can be done and sometimes has to be done because of the integration of the ECU into things like HVC.
IN regards to a SR2 - it's not a problem - SP20 or even 626.

Overall. Other then getting a workshop who is accredited and experienced enough to know what they are doing - ones that have turbo'd many N/A cars before and have been around longer then 5 years. Dropping the car off and letting them do the work.

You either do it all your self or will have do a bit of running around towing car here or there or even risking things minor or high risk to get it done. It's just the way it is.
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Old 12-12-2013, 09:03 AM   #47
danbowe84
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What do u mean by hvc? High voltage coil?
And do there will be no problems running the vics manifold(with an aftermarket ecu) or it will still take someone familiar with it to program it to get it to run properly
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Old 12-12-2013, 12:44 PM   #48
rodhog
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Heating ventilation control. They call it HAVC now or AHVC.

They were integrated or at least sent signals to the Engine control unit's from Central processors as early as 1983 in some mercs. most by mid 90's were telling the unit when the fan was on A/c and if heater was active. By late 90's the fan won't turn on with heater on until engine is at a set minimal temperature.

SP20 controls will only be telling the factory ECU to idle up the engine when the A/C is on shut off the A/C output to compressor when at Full throttle and idle up and compensate when blower unit is above number 2 setting. It might do a few others but it's not a climate control unit so it's not going to stop it from running when engines cold etc.
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Old 18-12-2013, 06:26 PM   #49
danbowe84
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So the intake cam on a Aussie 626 is a fsd7 like the exhaust on a sp20, has anyone changed a sp20 exhaust to a fsh9?
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Old 18-12-2013, 09:20 PM   #50
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HVAC controls are independent of the ECU in the BJ, regardless of auto climate control or not

the only reason to run the stock ECU still is to control the alternator (regulator part of ECU), idle controller, and various other bits... you can change the alternator to a 626 one (if not at least USDM 626) and get rid of the stock ECU completely but having to live with idle controller issues
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Old 09-01-2014, 07:05 PM   #51
danbowe84
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Ok on inspection of cam gears of sp20 motor and 626 motor, they both appear to be identical, same size, all marks in same place, do I need to swap them over?
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Old 09-01-2014, 07:50 PM   #52
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the 626 could use either type of cam gear depending on the gearbox type used, so you're best just swapping the cam gears to avoid any guess work and headaches
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Old 09-01-2014, 10:39 PM   #53
danbowe84
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Ok is it silly to assume that there would he differences you can spot with your naked eye?
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Old 14-01-2014, 04:50 PM   #54
Ice88
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One of the cam gears utilises 1 magnet the other uses 3.
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