If you mean a VNT25 from a 2.2L Shelby, it's too small for a 300SD.

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

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

Thanks for the offer, but I'll stick with what I've got. It took me forever to get it. It's a brand new one from Germany.

So what's the max pre-turbine EGT?

Andrew

1250*f constant, 1400* for short bursts.

Have you guys done any modification to the fuel pump? Because as far as I know a 603 turbo engine's stock IP is good up to 180hp. Do you really need a larger turbo?

I wouldn't mind a working vnt turbo though, so I can still have the same peak hp (as much as the stock ip allows) but with extra torque down low.

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1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.

That sure is some nice little setups! I wouldnt mind the air to air setup myself with some water squirt nozzles in the front for hot days..

Oh the days of my old 94' twin turbo supra.......


Well grand national, neon srt-4, and turbo supras come to mind when looking for intercoolers.. What do you guys think?

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Thank you for all the help guys!

"Old Gretchen" <--1983 300SD w126 cali. emissions (so it says on wdw sticker)
LIght metallic blue with dark blue interior. Odo stuck at 160,500 mi.

www.handydo.joolo.com

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.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

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

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.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

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.

So it didn't surge before the intercooler?

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John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k

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

Interesting! Good to know...

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John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k

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).