6G72 cooling system PDF

[Lithium]

Hey guys, I need some help finding out exactly the flow off our coolant system( for example- from pump- crossover pipe-thermostat housing- what evers next). I'm going to be experimenting. Thanks in advance.

[RL7]

From tech info manual on Stealth316:

1866 1867

[Lithium]

I didnt even think to check Jeff's page. thank you sir.

[VR4Drive92]

what are you experimenting with?!?!

[x2percentmilk]

Ditto, now im curious

[Lithium]

Are you guys sure you want me to spill the beans?

[x2percentmilk]

hmmmmmmidk


...yes :)

[Lithium]

Well we might as well debate about this idea of mine. So I live in New Mexico where 100 plus degree temps are very common during the summer. At the moment I have 3sx's over sized radiator and my fans will kick on and off every 30 seconds to keep my temps at 210ish. Not such a bad thing but the outside temp at the moment is around 30-45 degrees depending on the time of day. I don't want my fans to be on full time just to keep my car cool during the summer. I'm a little afraid that every time I get into boost I will instantly cause the fans to kick on.

At the moment air must travel through my front mount and A/C condenser before it even reaches the radiator. I will be keeping my A/C because driving in the summer will be a nightmare without it. My idea is this, I want to put two small radiators (250cc dirt bike radiators to be exact, about 8x4" in size) in front of the passenger side wheel which would utilize my only open vent in my bumper (99 bumper). These two radiators would be plumed in line from each turbo back to the thermostat housing. I choose this location because its where the coolant is its hottest during boost. What I'm hoping to do is to NOT lower my coolant temp but to dissipate more heat without relying on my fans to do all the work. I believe the coolant reaches much higher temps after flowing through the turbos(during boost) which then in turn dumps back into the thermostat housing (right next to all the temp sensors). The much hotter coolant coming from the turbos instantly causes the sensors to freak out causing the fans to turn on.

So if any of that made any sense then good, I have been thinking of this for the past two weeks and already have a set of radiators on the way. I have thought about many issues this may cause but I believe it hold more benefits then cons. We should discuss location, where exactly the radiators should intersect in the cooling system and such. I'm open to ideas and criticism so please offer your two cents. If all else fails it will be a fun learning experience.

[MR2]

I found a new radiator made very little difference (over my stock one) what made an amazing difference for me was a massive oil cooler... I don't have a FMIC though.

I hear what your saying though...and I'm pretty sure you could fit quite large radiators in each tyre well if you pull them back enough...

[Lithium]

I found a new radiator made very little difference (over my stock one) what made an amazing difference for me was a massive oil cooler... I don't have a FMIC though.

I hear what your saying though...and I'm pretty sure you could fit quite large radiators in each tyre well if you pull them back enough...

I already Have an oversized oil cooler which really helped with my oil temps.

[VR4Drive92]

what are your current oil temps? before and after the oil cooler?

[R/T93]

I got a 2" koyo radiator and an aftermarket oil cooler. My fans only come on after excessive idling (20 minutes +) or while on a road course or autocrossing. Cruising oil temps are 58-70C.

Water temp doesnt go over 188F unless I'm racing.

Maybe all you need is a 180 degree thermostat?

[Lithium]

what are your current oil temps? before and after the oil cooler?

It can get up to 230ish after some spirited driving which is exceptable for synthetic.

[Lithium]

I got a 2" koyo radiator and an aftermarket oil cooler. My fans only come on after excessive idling (20 minutes +) or while on a road course or autocrossing. Cruising oil temps are 58-70C.

Water temp doesnt go over 188F unless I'm racing.

Maybe all you need is a 180 degree thermostat?

I have a fail safe 180 in at the moment. I guess another thing to let everyone know is I also have an aftermarket fan controller that I can set the preferred temp to.

[MaxClass]

Well, since your cat is out of the bag I might as well spill my beans too.

Back in about November of 2010 Steve of 3SX was here in Vegas for the car show and met up with our local group for dinner. I mentioned to him an idea that I had to possibly help solve heating problems on cars that live in really hot summer climates like Vegas, Phoenix, Tucson, etc. and run a FMIC that sends extra heat on through the existing radiator.

What we talked about was removing the stock radiator when using a FMIC and replacing it with two side mounted radiators in place of the existing SMIC’s.

He thought the idea had some real merit. We even talked about whether or not it was possible to use the SMIC’s as radiators but were uncertain if that was a good idea or not.

It could also be possible to have each Side Mounted Radiator [SMR] have an individual fan attached that would come into play in city driving.

These units would end up exhausting all the engine heat transfer out through the wheel wells and not back into the engine compartment where it came from in the first place. Makes sense to me.

Only possible downside we could see was if the IC openings in the front bumper would provide enough incoming air for proper cooling and heat exchange in city driving.

Sounds like something enough minds on this list may be able to work out since someone has already started something along the same line.

Will be interesting to see how things go with “Lithium” and his progress.

P.S. There was another post recently regarding fan “hot wire” mods off of the A/C relay or something like that to make the fans run all the time by only jumping one wire. One could add that jumper with a simply toggle switch in line for two modes of operation. ON for summer, OFF for winter.

[MR2]

Maxline, that's an idea I actually like for once...allows craploads more turbo space too.

[Lithium]

I will keep my updates posted, I'm planning on finishing up this project the end of next month. I will post photos of the radiators and fittings once they are made.

[VR4Drive92]

The side mounted radiators sound good in theory. I think it could work too... you would need THICK cores though... and VERY high volume fans that would be on nearly constantly. The other thing would be the calculations of the head loss in the extra plumbing and the dynamics of the pressure drop in the individual cores in regards to wether or not the factory water pump can support the demand.

[x2percentmilk]

Does any one else find it ironic that youd be moving your radiator to the stock side mount IC location because you decided you wanted a front mount IC that now blocks your stock radiator??
Am I missing something?

Otherwise, lithium im interested in your project, keep us updated!

[Nihil]

I'd think the stock side mounts would work better,if you could make that work. Your only flaw in what you're doing is using 250 rads, the hose inlet/outlets for those are like 3/8 or somethin small, and low capacity. I don't think there will be enough flow or fluid being cooled at once, to be productive.

Flex a lite makes a lot of different sized fans, I'm sure something small enough to fit a large smic and all you'd have to do from there, is plumb in your water inlet/outlets

[Lithium]

I'd think the stock side mounts would work better,if you could make that work. Your only flaw in what you're doing is using 250 rads, the hose inlet/outlets for those are like 3/8 or somethin small, and low capacity. I don't think there will be enough flow or fluid being cooled at once, to be productive.

Flex a lite makes a lot of different sized fans, I'm sure something small enough to fit a large smic and all you'd have to do from there, is plumb in your water inlet/outlets

I was worried about this exact problem. Hints why I decided to tap into the turbo return lines instead of just going with two complete side mount radiators. Im expecting to spend around $300 bucks on this side mount setup which will cost much less and I believe result in the same performance gain. I have been toying with the idea of adding fans to the smaller radiators but somehow I think that would be overkill.

[Lithium]

Does any one else find it ironic that youd be moving your radiator to the stock side mount IC location because you decided you wanted a front mount IC that now blocks your stock radiator??
Am I missing something?

Otherwise, lithium im interested in your project, keep us updated!

It is very funny indeed.

[Nihil]

I was worried about this exact problem. Hints why I decided to tap into the turbo return lines instead of just going with two complete side mount radiators. Im expecting to spend around $300 bucks on this side mount setup which will cost much less and I believe result in the same performance gain. I have been toying with the idea of adding fans to the smaller radiators but somehow I think that would be overkill.

So, are you saying, you'll have two side mounts, essentially, just for cooling the turbo outlets? 3 radiators total? If that's what you're sayin, that'd probably work wonders, just cooling the returns from the turbos, as long as flow isn't obstructed/reduced from the sidemounts.

[Lithium]

So, are you saying, you'll have two side mounts, essentially, just for cooling the turbo outlets? 3 radiators total? If that's what you're sayin, that'd probably work wonders, just cooling the returns from the turbos, as long as flow isn't obstructed/reduced from the sidemounts.

Exactly, Both turbo radiators will be mounted in front of the passenger side wheel because the drivers side is holding my larger oil cooler. As long as I can burp the system properly I think the stock pump can easily handle the extra strain.

[Nihil]

Exactly, Both turbo radiators will be mounted in front of the passenger side wheel because the drivers side is holding my larger oil cooler. As long as I can burp the system properly I think the stock pump can easily handle the extra strain.

That sounds like it'll probably work well, my only concern wasn't as much as "burping the system" keeping air out, but changing the flow directions, essentially, making a couple detours, causing the flow to be less adiquate, if that makes more sense? Now that I understand, I agree, the water pump should have no problem at all dealing with the added capacity