Air/water intercooler installed in my 240D - Page 2 - PeachParts Mercedes-Benz Forum

libbybapa · #1 05-18-2007, 11:45 PM

No, I don't. I mean a VNT-25 from a European Opel 3.0L TD. I'm quite sure it's not at all too small, at least it's bigger than yours.

Andrew

#2 05-19-2007, 12:24 AM

Quote:

Originally Posted by libbybapa

No, I don't. I mean a VNT-25 from a European Opel 3.0L TD.

I've got a nice little GT2256V for you if you want to trade. I'll pay the shipping for both.

MBdieselFreak · #3 04-09-2008, 08:15 PM

hey were you talking about this 9000 SAAB intercooler???? Well here's a pic of one, and i find that a good size of tubing for intercooler set ups is 2.75" i never seen that back in boston. So i guess its a canadian thing or something, because they have some at my parts supplier. if you have more boost then stock then, you should go with 3" tubing depending on the size of the intercooler too and all the intake related items.

Quote:

Originally Posted by libbybapa

What is considered the "safe" limit for pre-turbine EGTs on these motors?

After looking here and there, I'm feeling like it's time for me to learn to weld aluminum. I've got the steel welding thing down pretty good. I like the Saab 9000 intercooler for it's huge area and it's slim profile. It should leave room for a slimline fan, A/C condenser and radiator and still let the hood close. I just don't care for the Plastic endcaps. I will be running a VNT-25 and don't feel like popping the intercooler. They have all aluminum ones for $700, but for that price I'm inspired to learn al welding and make my own endcaps.

Andrew

MTUpower · #4 04-12-2008, 08:10 PM

Quote:

Originally Posted by MBdieselFreak;

if you have more boost then stock then, you should go with 3" tubing depending on the size of the intercooler too and all the intake related items.

No 3" tubes here... and certainly no lag.

vstech · #5 04-12-2008, 08:31 PM

Quote:

Originally Posted by MTUpower

No 3" tubes here... and certainly no lag.

that is one tight fit.
what did all that come out of? 2.5 T? inquiring minds want to know...
there is no lag, because there is only about 4" of tubing... the others discussing lag and 3" tubing etc have the intercooler up front and piping going to it, yours has the intercooler ontop of the turbo and the cooling air plumbed up front... nice!

bgkast · #6 05-20-2007, 02:57 AM

It's a tight fit for any air/air up there...if you want to keep the AC. The non-crossflow engine is also not conducive to an air/air setup IMO.

libbybapa · #7 05-20-2007, 12:05 PM

The Saab 9000 intercooler with some custom endcaps should sneak right in along with a slimline fan and still let the hood close. Also, as far as space goes, you either need to fit the air to air intercooler, or the extra radiator for the air to water setup. Seems like a wash to me.

Andrew

bgkast · #8 05-20-2007, 03:45 PM

The trick with an air/air is routing the 3 inch tubing back across the front of the car to the intake. It's much easier to route 3/4" coolant hose. The air/water also should give less lag because there is only about 6” of tubing needed.

#9 05-20-2007, 05:18 PM

3" tubing is overkill for 120hp. But if you can fit it, it won't hurt beyond a little lag.

2.5" is about optimum between flow capacity, space occupation and turbo lag. Especially with the stock intake, it will restrict it back down to 2.5" anyways.

I'm using 2" tubing for my air/air system. However, it will cause the turbo to surge at low RPM's from it's lower flow capacity.

Tymbrymi · #10 05-20-2007, 08:24 PM

Quote:

Originally Posted by ForcedInduction

I'm using 2" tubing for my air/air system. However, it will cause the turbo to surge at low RPM's from it's lower flow capacity.

So it didn't surge before the intercooler?

#11 05-20-2007, 08:28 PM

Quote:

Originally Posted by Tymbrymi

So it didn't surge before the intercooler?

When I had a direct connection to the intake? No, it didn't.

Tymbrymi · #12 05-20-2007, 09:06 PM

Quote:

Originally Posted by ForcedInduction

When I had a direct connection to the intake? No, it didn't.

Interesting! Good to know...

#13 05-23-2007, 09:36 PM

Quote:

Originally Posted by bgkast

The air/water also should give less lag because there is only about 6” of tubing needed.

In my upgrade to 2.5" tubes I will need:
75* angle tube- 1
45* angle tube- 1
90* angle tubes- 4

Total length from the turbo outlet to the intake mouth will be about 3.5 feet (Not counting the intercooler).

Old300D · #14 05-24-2007, 01:37 PM

Quote:

Originally Posted by ForcedInduction

In my upgrade to 2.5" tubes I will need:
75* angle tube- 1
45* angle tube- 1
90* angle tubes- 4

Total length from the turbo outlet to the intake mouth will be about 3.5 feet (Not counting the intercooler).

I fabricated an air-air intercooler in my Datsun 280Z, which has a straight-6 non-crossflow engine. Total length of that system, using 2" tubing out of the turbo to the intercooler and opening the 2" to 3" before the intake, was about 6'. I have no noticeable lag; I attribute that to a restriction-free exhaust and a stock T3 turbine. The car dynoed 313 hp to the wheels.

libbybapa · #15 05-24-2007, 02:36 PM

I've added several air to air intercoolers to several TD engines and have never noticed an increase in lag. That being said, I've also always gone for the non-restrictive exhaust. I live at 7,000 ft of elevation so any extra lag is more than noticeable.

Andrew