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Coolant system changes for DBW/ E-throttle (IACV and secondary bleeder delete)

CowsWithGuns

By CowsWithGuns,
in General Maintenance

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CowsWithGuns Enthusiast

CowsWithGuns

Posted
Posted

Hey all,

I'm setting up to go DBW (IACV delete) and the front bleeder is blocking my new intercooler piping (and it's grievously ugly). Wanting to confirm that I am not preparing for grief with these coolant changes.

These are the flows as far as I can tell. I am hoping that I can block off all red and blue lines with no issues.

image.thumb.png.75aa1f990ce17946dd1653d58a004fb2.png

Assumptions are:

  • The radiator cap will now be the highest point, eliminating the need for bleeders. I vacuum bleed anyway.
  • The three lines to the intake manifold (green, red, blue) also converge with purple from the head and bugger off out the snout to the radiator.

My main concern is that I may be introducing 'air traps' by blocking off the two nipples (lime green circles below) at the top of the intake manifold. I don't understand coolant systems properly yet - will this air eventually fart its way to the radiator? If not, is this of any significance? It's a very small volume but I've had some traumatic coolant experiences and seek assurance :D

image.thumb.png.381179ac4c08dcb6313b5bc794cf784e.png

Cheers

 

robbo_rb180 Grand Master

robbo_rb180

Posted
Posted

Run a swirl pot, will remove all the air from system.
I did that and never had an issue. I drill and taped the 2 light green circled points and put in bolts with copper washer, can also use as bleeders.

 image.thumb.png.1bae52570b35fd76beae17942e53c558.png

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CowsWithGuns Enthusiast

CowsWithGuns

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Posted
  On 29/12/2023 at 11:44 AM, robbo_rb180 said:

Run a swirl pot, will remove all the air from system.
I did that and never had an issue. I drill and taped the 2 light green circled points and put in bolts with copper washer, can also use as bleeders.

Expand  

Haven't heard of these until now. Looks the goods, ty for enlightening me.

From reading this thread I think I will run it like so (teeing into the thermo housing rather than adding more stuff with a rad hose adaptor). Seems like a sweet 'guarenteed to work' solution as it utilises all the OEM bleed ports. It's a shame to add more mess to the bay, but better than bleeding these demons. Also means I don't have to take the intake mani off to drill/tap :D

This is a GK swirl pot so if the gods are kind all the fittings will match up too!

image.thumb.png.c6b2c235c640e22db1625bbaffa1cca0.png

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