To use an intercooler or not!!

[lyon23]

I planing on installing a turbo in my 240 swap. I want to run a single gt42 size turbo. I was thinking of 7-8 psi max. Will it be ok to not run an intercooler or is it necessary. I'll be using a 2 row aluminum radiator and an oil cooler to control temps. This will also determine turbo placement from driver side w/o or passenger with intercooler. If there is more info needed let me know so I can provide that.

[LEMHEAD16]

You really need to look at the compressor map to see what kind of efficiency you will get at 7-8 PSI. If the turbo is not pumping much heat into the air at 7-8 psi you would probably be OK. I would run an intercooler because once you have 7, you'll want 8, and once you have 8, you'll want 9........It's addictive.

Oil cooler and radiator will do little to control intake air temps.

[XJared]

Use an intercooler. A turbo of that size makes way too much heat to even consider it, even at low boost. And why would you get a 42R to run 8psi? They really don't come alive until the high teens. I ran 42psi on my Honda with a 42R.

[lyon23]

You really need to look at the compressor map to see what kind of efficiency you will get at 7-8 PSI. If the turbo is not pumping much heat into the air at 7-8 psi you would probably be OK. I would run an intercooler because once you have 7, you'll want 8, and once you have 8, you'll want 9........It's addictive.

Oil cooler and radiator will do little to control intake air temps.

Very good and valid points. I will start learning about reading compresor maps. And it is addictive. It would be the same to run the intercooler or to add the meth injection. I know I'll be limited by the stock motor but I do want to try 10 psi with a really good tune.

And why would you get a 42R to run 8psi? They really don't come alive until the high teens. I ran 42psi on my Honda with a 42R.

More power at lower boost. This turbo size will provide more volume at that psi than a smaller turbo with the same exhaust turbine.

[kingkilburn]

That does not mean it will do it well. It's all about response and efficiency.

[Nealoc187]

And why would you get a 42R to run 8psi? They really don't come alive until the high teens. I ran 42psi on my Honda with a 42R.

More power at lower boost. This turbo size will provide more volume at that psi than a smaller turbo with the same exhaust turbine.

That's not how it works. You're going to be almost off the map in terms of efficiency. Ridiculous. You should really rethink what you're doing.

[lyon23]

That does not mean it will do it well. It's all about response and efficiency.

That's not how it works. You're going to be almost off the map in terms of efficiency. Ridiculous. You should really rethink what you're doing.

That's why I said this..

I will start learning about reading compresor maps.

[XJared]

You didn't specify, but I assume since you're posting in this forum that you're swapping a VH45 into your 240sx. Two big questions here relate to your end result. Will you be doing internals? and What are your power goals?

[lyon23]

Power goal is 450-500. I have 2 engines a stock one with 130k on it and a second one to build slowly with pistons, rods and arp fasteners.

[tacozzz]

check this out

http://www.turbofast.com.au/TFmatch.html

i use this whenever i think about a turbo selection but it should be used as a GUIDE and not a definite selection but

for a vh45de 4600cc 7000 redline, non intercooled, and 8lbs of boost you might make 517bhp with a gt3076 with a 1.06 turbine housing.

then click on the intercooled box and you only have to run 6lbs of boost to make 510bhp.

look here
http://www.ctsturbo.com/products/Garret ... 72-25.html

id say run the gt3076 with no intercooler if those are your goals.



and you say you're going to build it with pistons, rods and arp....i know mazworx sells a piston set but any machine shop would be able to order some from je or whoever, but has anyone found any aftermarket rods like eagle or can eagle make custom ones for the vh and arp fasteners, the mains already have studs from the factory has anyone looked into part numbers to replace those and put together a kit for head studs? how about arp rod bolts for factory rods?


you should really rethink your gt42 turbo unless you want to turn the nonintercooled boost up to 18psi and push out a theoretical 654bhp

[hannibal]

No way is a GT3076 a good single turbo. Two of em would be sweet.

To answer your original question, an intercooler is certainly a good idea. That GT42 seems like a good fit. Its not breaking a sweat at all, but that doesnt mean its a bad turbo for the VH45. Take a look at this thread. Lotsa discussion about turbo sizing. turbo-sizes-t491095.html

[XJared]

Whatever turbo you end up with, get the biggest frame and a/r exhaust housing available. You'll need it with the big VH displacement.