Upcoming MPI Swap Thread - 1989 TSi
Posted 08 October 2017 - 03:20 PM
That passage in the stock manifold has a very restrictive flow restrictor inside the intake (where you cant' see it). It's just a trickle flow rate. It's also only for TBI, which you don't have. Running both intake ports to that steel port will starve the back of the motor for coolant flow in the back. Most of the coolant flow will take the easy path out the front port.
If one is going to argue that it's done that way on the magna (flows out that port factory), you have to keep in mind the magna thermostat is in the back where that rear port now flows. It has been removed and that rear port is now the only way to get water to flow into the back of the head.
Also, on the magna, that front port was restricted by the factory. It is a large nipple, but the inside diameter of the port is only 3/16" . Trust me on that, I've cut up over 100 of them.
Posted 08 October 2017 - 03:26 PM
So, following your logic I believe... Keeping that hose/port blocked off back there ensures adequate water makes it to the rear of the motor. By not circulating some of it back to the front, I'm going to be ok. I didn't waste 7 hrs of my Saturday? You've done alot of these magnas.
I appreciate all of the responses.
Edited by Matt888, 08 October 2017 - 03:37 PM.
Posted 08 October 2017 - 05:01 PM
Posted 09 October 2017 - 10:58 PM
Posted 12 October 2017 - 06:52 PM
Question: The stock intake tube had a vacuum line that went to the stock turbo's wastegate. Can I just run the vacuum line from the wastegate to the vacuum ports (with a T there) on the side of the MPI intake? Or is it important to have that vacuum connection from the wastegate go to the intake pipe, which is upstream from the throttle body.
Trying to determine if I truly need to add a vacuum port on the intake to the MPI like it did in stock form.
EDIT: I believe the answer is yes, I need the wastegate connected to the intake.
Edited by Matt888, 13 October 2017 - 11:14 AM.
Posted 13 October 2017 - 12:16 PM
Posted 13 October 2017 - 10:52 PM
Other than a vacuum line to the MAP sensor, valve cover, aftermarket boost gauge, and the wastegate, do I need to be connected to any other vacuum lines with an aftermarket ECU and MPI conversion? There's vacuum lines running all over the engine compartment and what needs any of that? There's opportunity for leaks everywhere and I'd like to keep it as simple as possible. Thanks!
Posted 13 October 2017 - 11:26 PM
Posted 14 October 2017 - 09:44 AM
4. MAP Sensor
5. Boost gauge
Posted 14 October 2017 - 10:43 AM
Although I so miss it
87 Valencia Gold TSI, The new Project
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