First of all (english is not my own language)
I have a 2000 Daewoo Lanos but i swap a LT3 engine in with the 8 valves head!
I begin the project to swap a 16 valves (Daewoo Nubira) head on my LT3 turbo engine...
If someone want to do this, you need almost a complete Nubira engine to make the conversion!
You need the head
The water pump are not the same (not the same number of theet on the pulley) and the T belt gear on the crank and idlers pulley and tensioners+ the timing belt cover...
After that you also need to notch the pistons (LT3 turbo pistons) to allow the space for valves clearance...
BUT i still have a problem...
I want to keep my 749 ECU but i can't put a distributor on the 16 valves head...
How can i have my signal for injection and fire (without distributor) and keep my 749 ECU???
I can use the nubira block (with the hole for the crank sensor) and a cam sensor but how i can convert the signal for my computer ( i see a box from MSD, but the box is for 24 tooth pulley (corvette)
I need help if someone have idea ...
not sure why you came here, this is the wrong board for this question.
Sorry!!! just delete this message!
Since the LT3 is a Sunbird engine and the 7749 is a J-body computer, I'll answer here.
In order to make the signal you need, you'll need to do some custom machining and have a custom chip made for the 7749. The 'Woo engine is similar to the Euro version of the 2.0 and uses a Bosch design DIS ignition system with a 40 tooth crank sensor. The crank signal is sent directly to the ecm / pcm which process the signals and does the job of triggering the coils directly. This is unlike most US built vehicles with DIS made before 1996. The US vehicles use a crank wheel with 6 notches plus an extra notch to generate a reference signal. The signal from the crank sensor is sent to an ignition module which operates independently of the ecm. The ignition module processes the crank signal and sends reference pulses to the ecm for crank speed as well as triggers the coils. When engine rpm exceeds a calibrated level the ecm will alert the module not to trigger the coils based on crank sensor readings, but based on a pulsed signal from the ecm called EST.
The Sunbird distributor and the 6+1 notch DIS system produce similar signals. The major difference is in the timing of those signals. The distributor signals are produced anywhere between TDC and 10 deg BTDC depending on where the distributor base timing is set. The DIS system always produces a signal that's 60 deg BTDC. The value which allows the chip to produce the correct ignition timing based on the reference pulse is contained in the chip and must match the ignition system type.
So, to put all this together you'll need to remove the Woo / Bosch design trigger wheel and install a custom made 6+1 trigger wheel. You'll need to install a crank sensor from a system which uses the 6+1 DIS system. These can be found on many GM 2.8, 3.1, and 3.4L V6 engines as well as the 2.0 and 2.2 OHV engines used in the Chevy Cavaliers. Note that this sensor is not the same as the Woo sensor. And you'll need to program the chip in the ecm with a 60 deg reference angle as well as the correct maximum and minimum spark advance angles.
I've posted about doing this on this and other forums. on V6Z24.com is an entire thread by someone who installed the 16V head in a 94 Sunbird. I posted many tips about using the 7749 there.
I don't visit this forum often anymore so I might not reply very quickly.
HTH
-->Slow
