1985 300SD shop "truck" daily driver 5 speed project - Page 2 - PeachParts Mercedes-Benz Forum

rwd4evr · #16 11-07-2018, 07:31 PM

Quote:

Originally Posted by Simpler=Better

I never dyno'd the car, I was broke as hell back then. Didn't get any more fuel than normal, I just pulled the ALDA to get more off-boost fuel.

I played with methanol sprayers, and they definitely made power, but really the right way to do it is take a deep breath and just buy a real injection pump. Sell off some of your extra wagon parts on eb*y.

Big tow #1-7ft x 10ft flat deck trailer (est 1500lbs empty, it was a redneck special) with a k440(360lbs) a zx600(450lbs), two beds, two dressers, all my tools (500lbs?), and the rest of the random crap when moving. So at least 3,000lbs.

Big tow#2-Uhaul box trailer that was bigger than the car (I don't know how they let me drive off with that one). Full of furniture but it was a giant sail slowing me down.

So were you running a straight methanol injection or water/meth? What type of system did you have and was it overly expensive consumption wise? I will definite be running waste oil so some fuel costs I can live with. Gotta get my filter setup put together though. We've got plenty of oil available here. I can run 80/20 wmo/rug a lot.

Simpler=Better · #17 11-08-2018, 10:52 AM

I made my own system, I think it was 5GPH. I still have the manifold somewhere in my shed if you want it (we welded in a sprayer bung on each runner).

100psi pump is $60-$100, Iv'e gotten them for $20 used before.
Then you need an on/off valve, pressure switch, tubing, fittings, etc. (Probably another $100)

So now you've got an extra system to maintain and you're at least $200 into it...or you could save that money for a $1200 pump.

Fuel economy tanked when towing I'm sure, I didn't even check. Was a straigt pipe with the 2056v, and never went past 1150*F (It's been a while).

You can adjust or remove your alda, that sets the pump to deliver "12psi" worth of fuel. There's a document on superturbodiesel forums detailing the tweaks you can further make. use OM616 probably has a copy too.

DON'T pull the rack limiter, just adjust it as needed. That was an early mistake a lot of us made.

rwd4evr · #18 11-08-2018, 11:01 AM

So is it straight meth or washer fluid? A k-jet CIS pump pushes 85-90 psi I've got a bunch of them. What type of" sprayer" we're you using? I would be interested in the manifold possibly. K-jet injectors would be ideal for this too I think.

Simpler=Better · #19 11-09-2018, 03:03 PM

I ran 49% alcohol, 51% water using a shurflo 100psi pump. If you run anything higher than 50% alcohol you're risking pre-detonation under compression.

www.Mcmaster.com part # 32885K731 (general use spray nozzle, 1GPH @100psi x5)

If I did it all over again from scratch I'd run a single large nozzle upstream from the manifold. The 5 port monster wasn't the best design, especially since it was built into a short runner manifold.

You add a valve and pressure switch to keep it controllable.
Pump->pressure switch->valve feeding the sprayers. This way you can have your lines pressurized and then flip a switch to start dispensing. If you just have the pump plumbed directly to the nozzles air will get in the lines and they don't start as evenly.

rwd4evr · #20 11-10-2018, 07:38 AM

Ok. So it was sort of like a nitrous system, on demand only. Not a throttled ful time supplement. the CIS gas injectors would be perfect for this since they are sealed up to 55 psi or so. I'll have to flow test them at some point when I'm screwing around. I'd love to see some dyno results with a diesel meken pump and the right parts. If I can go over 200hp and 300+ lb ft I'm sold. But a bigger turbo and meth injection for the time being to achieve similar power would be great.

moon161 · #21 11-10-2018, 11:23 PM

Oldsinner111 I think used propane switched in either by putting a switch at the end of accelerator travel or at a certain boost pressure.

Simpler=Better · #22 11-12-2018, 11:41 AM

Quote:

Originally Posted by moon161

Oldsinner111 I think used propane switched in either by putting a switch at the end of accelerator travel or at a certain boost pressure.

Propane is risky because:
-If the engine is hot enough, you can get detonation
-You can get ticketed for using non-DOT tanks on the road

rwd4evr · #23 11-15-2018, 01:10 PM

I'm not a huge fan of the "power added" idea like nitrous or propane or meth for that matter but I guess it's only used for acceleration or on a steep grade? Not pumping extra fuel cost while cruising right?

I finnlly finished moving all my stuff from my old shop to the new one( big thanks to Fonzi )not gonna say my move is finished cause there's lots of setup and trashing of some stuff. i just looked at the ax15 next to a Mercedes manual and it's way bigger. I think some serious tunnel rearranging wil be done.

rwd4evr · #24 03-06-2019, 04:22 PM

So continuation of this thread, the w126 sedan has been saved from chopping block. I just bought a rust free w123 wagon (shocking!) It's got plenty of other issues but rust was one I didn't want to deal with, minor crash damage in the rad support and pass fender mount. . So all of my planned mods for the w126 will end up in the wagon where I wanted them in the first place. Super excited about that, I can make it look good now too. At least from a little distance. I'm not going to go crazy on perfect paint and body. I don't want to be so concerned about parking it and beating it. First will be manual Swap, with 3.23 LSD rear. Gen 2 w126 front brakes. Then start looking at more power.

moon161 · #25 03-14-2019, 03:54 PM

Quote:

Originally Posted by Simpler=Better

Propane is risky because:
-If the engine is hot enough, you can get detonation
-You can get ticketed for using non-DOT tanks on the road

Prohibited in the Holland and Lincoln tunnels, as well.

moon161 · #26 03-14-2019, 04:02 PM

Quote:

Originally Posted by rwd4evr

So continuation of this thread, the w126 sedan has been saved from chopping block. I just bought a rust free w123 wagon (shocking!) It's got plenty of other issues but rust was one I didn't want to deal with, minor crash damage in the rad support and pass fender mount. . So all of my planned mods for the w126 will end up in the wagon where I wanted them in the first place. Super excited about that, I can make it look good now too. At least from a little distance. I'm not going to go crazy on perfect paint and body. I don't want to be so concerned about parking it and beating it. First will be manual Swap, with 3.23 LSD rear. Gen 2 w126 front brakes. Then start looking at more power.

I'm curious about the LSD in a W123 (finding one for it, suitability, installlation, etc.) Please keep us up to date about that.

rwd4evr · #27 06-20-2019, 04:10 PM

All diagonal swingaxle cars(w114,115,116,123,126,r107,c107) diffs will Interchange with the exception of 86 and up "gen 2" r107 and w126. The input flex disc must be the correct size. R/c107 is the most likely source for a LSD but any car could have one as an option. They are fairly rare though. Unfortunately the most common is a 2.47 in a 560slthat is a gen 2 diff. I got my 3.23 LSD in a euro 380slc. You also have to be aware of the 188mm and 210 mm difference. All v8 are 210 and I can't say for sure off the top of my head but it's very possible a v8 diff will require a shorter driveshaft. Axles go with the diff. All the same except w116 and w126 which are longer. Maybe only one side but I forget at the moment.

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rwd4evr · #28 07-09-2019, 03:05 AM

Got the 300sd tagged and I'm daily driving it. Some what reconsidering making it an El Camino now. It drives well and everything(including ac) works so swapping to the rust free ****box wagon I bought will be a big deal. Maybe later. For now I want to get this car to my liking. I cut a coil in front(could use a touch more but the obnoxious nose up is better) . It needs shocks bad Need to build a real hitch and get some more power. So I have done some more reading and I'm kinda sold on the water meth injection. The higher the pressure the better from what I see. I've found some 150psi pumps for under 100$. I'm thinking 2 nozzles right after the turbo, so more flow from both if it can handle it with the stock turbo(for now). Can anyone recommend a good read on an om617 turbo similar to this setup? Also what is the opinion on a China hx30w compared to stock vs an hx35? I've read the stock turbo is limited by fuel not it's size, so is a meth setup going to be enough fuel to run out of (stock)turbo?

rwd4evr · #29 07-10-2019, 02:58 AM

Maybe I like reinventing the wheel a little and I can do it cheap I think. What do you think about compressed air powered water meth injection? Small onboard compressor and tank which is good to have for air shocks and towing junk in general. Pressurized water meth tank when engaged only. The rest really wouldn't be any different than running an electric pump.

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