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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 06-29-2019, 11:38 AM   #1 (permalink)
jnlperformance
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Much cooler iat(s) BUT... well.. you'll see.

BEFORE I go off and do something this 'radical'... figured I'd get some opinions.

I like it... but... I dont. It's not as conservative as my original idea, but without doing something similar to what dieselolds did... well, there it is.

It WILL drastically reduce iat(s)... and for the time being I may just have to deal with it...

My original idea was to have the filter housing fit between the turbo and intake over the valve cover but without intake modification... it's not possible for it to fit.

On the bright side (because that setup would be very temporary) I can utilize the same hole in the hood and install a velocity stack as originally intended... then a hood scoop over it...

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Old 06-29-2019, 12:38 PM   #2 (permalink)
jnlperformance
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Well... no comments from the peanut gallery huh?

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Old 06-29-2019, 12:43 PM   #3 (permalink)
dieselolds
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It’ll definitely give it that ram air effect but I like your hood scoop ideaI always thought about intercooling one of my trucks with a universal kit from eBay and put a decent size cooler behind the grill but I might or might not do it.Depends on how much free time I have...lol.
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Last edited by dieselolds; 06-29-2019 at 12:47 PM.
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Old 06-29-2019, 01:05 PM   #4 (permalink)
jnlperformance
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Ok well no matter anyway. I just noticed the filter housing has a major flaw for future use (does not completely seal) so the idea is getting scrapped for now anyway.

Just gonna stick a filter on the hood instead. A temporary fix to the high iat issue (for now)
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Old 06-29-2019, 01:07 PM   #5 (permalink)
jnlperformance
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And to anyone looking for a better alternative to intakes;

Donaldson.

I just cant afford a 200.00 filter housing at the moment. Screw that. Gonna fix my issue for 40 bucks. Run the filter direct for now.
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Old 06-29-2019, 01:15 PM   #6 (permalink)
jnlperformance
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Yea dieselolds... I agree. The best solution is a combination of what you did + what I want to do;

Modify the upper intake plenum. Clock the turbo housing straight up. 90* towards rear, another 90 directly to modified intake. That will allow a filter housing to be placed directly between the turbo and intake (over the passenger bank valve cover) or in theory it ***should*** allow for said clearance.

Then you can have a 180 direct from turbo inlet to housing. 90* straight up to the hood ending with a velocity stack (flushmount on the hood) but no flex hose (what I want to stay away from which I cannot for now ) but then cover the velocity stack with a functional hood scoop.

Alternatively if you wanted to intercool the system; clock the turbo outlet straight down and run that to the intercooler (bottom). Come back out the same side at the top side of the intercooler... follow same path as if the turbo were clocked straight up. Come past the turbo and 90* over it direct to intake.






For now though I'm just gonna use another length of flex hose and two vent mounts. Mount the filter direct on the hood. I just need cooler iat(s)... yesterday. No point in having an intercooler unless you have the cold air to back it up though. Why I haven't installed one yet.

And for those who would say... "well, what about rain"?

Well what about it? They make wmi systems that inject 70/80% water 30/20% methanol into the intake (though its past the turbo outlet) but rain would only cool the turbo down, reduce iat(s) and egt(s).

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Old 06-29-2019, 01:23 PM   #7 (permalink)
jnlperformance
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Donaldson. But they arent cheap. High cfm filter housings though. E series.

You can download a pdf containing all their intakes and such.
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Old 06-29-2019, 01:50 PM   #8 (permalink)
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Intercooler works and works well on my '93. Bottom mounted and was from Peninsular, who unfortunately are out of business. They sure had very good customer support. I've got the turbo that starts with an "A" and can't be mentioned on this forum, apparently. Fuel is turned up to no more than 13 psi. boost. I've got a dual temp. gauge: compressor out temp./Eng. inlet temp. Under full boost I'll get 130-150 degrees temp differential between comp. outlet/engine inlet. I don't get the large temp. increases on the eng. temp. gauge at all like I did before under full boost. And the eng. definitely has more power. No, they're not cheap, but worth it in my opinion. If you're only running 5 psi. max boost, probably a waste of time and money. But they work at higher boost levels.
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Old 06-30-2019, 01:35 PM   #9 (permalink)
jnlperformance
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Totally agree with the intercooler. I just feel as if its wasted $$$ until I have the initial cold air to back it up.

The logic; if I get the temps down without an intercooler and wmi, itll be all the cooler with the aforementioned... and even cooler if I swap for another turbo outside the gm4.

I dont wanna turn the boost up until I lower the temps. I've got the hardware and solid foundation for it though. Doing maybe one or two mods at a time. Maybe 3 tops.

For now... just need lower iats so I can drive it around town once again. Dont wanna be pulling hot engine bay air... I haven't driven her since I left for my trip around the country with my father. Getting... edgy.

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Old 06-30-2019, 02:04 PM   #10 (permalink)
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How about this look:

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