Hybrid Turbo Project - Page 2

EvoStevo · #11 11-16-2009, 12:25 PM

Hey guys, it's been awhile. I haven't started on the turbo project yet. I actually haven't done anything with my cars for the last three months or so as work has been so busy. My 240 is just sitting for right now until I find the time to work on it again, but once it's running I can concentrate on the turbo. I'll probably just stick to my original plan and do the .60/.48 T3 minus the water-cooled center section. Hopefully I'll have an update for you soon.

Jason · #12 11-16-2009, 12:33 PM

Mine is also right at 3000rpm at 70, and on level ground thats probably good for 3 to 4 lbs of boost with my even bigger .63 A/R. Granted, my compressor housing is much bigger so even though my turbine speed is slower, its pushing more air. It may not really reduce the cruising boost all that much. I wouldn't really worry about a few lbs of boost on the highway. 5lbs under a light throttle isn't taxing the engine, and is just keeping all the fuel burnt and everything clean.

Jason

Slobodan · #13 11-24-2009, 01:28 AM

Well I did it, I changed out the .36 Turbine housing with the Mercedes .48 turbine housing tonight, and yeah, there is a difference! Right at about 2,800 rpms its climbing up to 6psi and the power just pours on, like its scooting along briskly. and that about where boost just about rockets to 10psi and stays. much different for me than the .36 which didn't do that. it just slowly and steadily went to 10psi... maybe there was something wrong with its wastegate?

I also did a bit of much needed maintenance ---> timing belt, front main seal, and water pump. the belt was fraying where the teeth meet the low spot on almost every tooth. On the bottom timing belt cover and trough were covered with timing belt remnants because of the oil leak that sprang up in July.

I was very very very glad I finally got to it!!!

IceV_760 · #14 11-24-2009, 02:42 AM

Nice to hear Slobodan.
Tell us more about the driveability of the car in normal use?

Slobodan · #15 11-24-2009, 07:32 PM

Normal driving seems fine. The mercedes turbine is still the same basic design as the stock turbine but bigger .48 A/R.

Ultimately I would want to get a .48 A/R or .63 A/R Gasser Garrett Volvo 240 style turbine housing on my existing center and compressor (.60 A/R HT18) or T4 .70 A/R compressor. Hmm.. Ultimately.

But Its kind of fun to do that whole step by step way... Just so see what changes I make result in the way I get power from my setup.

Jason · #16 11-24-2009, 07:45 PM

So you only changed the turbine housing at this point, and still running the stock compressor side? I would say the waste gate was either starting to open too soon or was leaking. The .36 housing should have made the boost skyrocket right up to 10 lbs no problem. The slightly more lazy spool up to 6 or so would be what I would expect with the larger .48 housing. Either way, if your happy with the result and it improved performance, than it was worth it. Wait till you upgrade the weeny compressor side! You think it spools hard now... Have you turned up the pump much?

Jason

Slobodan · #17 11-24-2009, 09:23 PM

I had all ready changed the out the .42 Compressor.... done that 1 month after I completed the swap last spring `09. As of now I've got a .48/.60 T3.

Its strange, I've noticed with the stock Turbos VW vs Mercedes.
That on the VW we've got the .36 with the .42 and the compressor. seems okay.
On the Mercedes we've got the .48 with the .42 compressor. however the inlet tapers down a bit before the compressor wheel.. Same as SAAB turbo 900's I've noticed. So whats up with the Differences? obviously bigger is better and smaller sucks.

Jason · #18 11-27-2009, 05:57 AM

Different trim compressor wheels and different designed housings. Some of the shape may be for sound. The HE351 found on the later common rail cummins engines have a "silencer ring" that pretty much necks down right before the compressor wheel to keep the whistle down. Its one of the first things to go if your looking up turn up the power.

Jason

Jason · #19 11-27-2009, 05:58 AM

If it spooled slowly like you were saying with the larger compressor side already, and the stock .36 exhaust, there must have been a waste gate problem. It should have really spooled well with the larger comrpessor and stock exhaust housing.

What have you done to your pump if anything?

Jason

Slobodan · #20 11-27-2009, 06:26 PM

I've constantly messing with the pump, I've got it timed to .88 now. I like it better there I think. before it was clicked in at .95. runs smoother now. and as for fuel I'm trying to just get it set moderately. I am not trying to wild there. My goals for this car is not extreme. but not stock.