Help me calculate HP!!! DYNO must have been wrong (modded-out 240d) - PeachParts Mercedes-Benz Forum

Twintake · #1 01-07-2018, 11:39 AM

Hey guys new to this forum but def not new to forums (no newb here) and kinda new to Benz's but not new to diesel, again no newb here.

I just picked up a 1980 240d about 2 months ago, she has only 415k on her but to a MILLION MILE ENGINE!!! that should be nothing. This is my third soon to be drifting car.

My first was a 1993 civic (heavily modded, cut springs, turbo, eBay intercooler, accord brake system all around, straight pipe to custom whistle tip, ya know... The works.) she had to be pushing 350 400 horses.

My second was a Mazda Miata drop top that pullllled!!! Basically the same mods as my civic but no turbo. (Civic threw a rod so I frankesteined all my upgrades into my drop top) something was wrong with the turbo so I just left that out. What I did was spliced the IC piping straight into the intake, so i was at least getting ice cold air in there. In theory that should be pretty close to the same effect as a turbo. (This was the BEST IC on eBay btw)

Ok but anyways now that u guys know that I know my way around an engine let's get to my current issue. I took my 240 to my local DYNO and ran it multiple times and she kept hitting at only 55 wHP!!! Hahaha this cannot be correct I told the guy and he just wanted to argue, I wanted a refund but he wouldn't have it so I just got outta there.

And so ill bring this to u guys, the guru's!!! I figure I'm somewhere around 230-240 wHP by the amount of mods I've thrown at this car in the past few months, lemme know what guys clock me in at.

--- So I've spliced in a twin cold air intake set up. It's just a Y pipe connected to two intakes, I ripped off the POS stock dishpan intake and thrown this in place of that. (17 HP per intake so 34hp)

--- exhaust manifold and exhaust piping DELETE. I've completly removed it straight off the engine so there is NO manifold at all. This obviously allows less air restriction and MORE air the be pulled thru the engine, especially since this paired with my twin cold air intake!!! (I'd say this must add another 30-40 HP, but also atleast double the input of cold air at the Twintake (hence my handle) so that bumps it to 68 HP)

So this simple mod alone Adds a conservative 100hp so with just that I'm at 165 wHP, DYNO must have been wrong right guys!!! Haha ya obviously, but there is MORE!

--- synthetic oil complete swap from conventional, when these old diesel are ran with heavy duty conventional diesel oil it really bogs them down (can someone say Black death!! Haha) so switching to a thin synthetic allows the pistons and and crank And etc to move and spin faster. ( So another 15 - 20 HP here)

--- removed extra weight, interior is gutted (500 lbs lighter) now they don't make carbon fiber hoods trunks door etc for these cars, for reasons unknown. So basically I have left the main frames of these body parts and cut out as much of this heavy metal as possible with my disk grinder (750 lbs) so 1250 pounds lighter give or take (so that should add another 30-40 HP)

--- and lastly ivr fitted my civic's (rip) spoiler/wing onto the 240. I just don't think a DYNO can take this into account (along with the lightness of the car) because it's not actually moving on the DYNO. I mean duh guys it's physics, so what the wing does is hold the whole car onto the ground tighter allowing here to really get a good grip on the track, hence MORE WHEEL HORSEPOWER!!! and just straight pull (so again I thibk this should add another 20 - 30 horses)

So with all these simple DIY mods my ride is at a VERY CONSERVATIVE ~235 horse power to the wheels.

So if anyone else wants a FAST w123 this is what u need to do. I haven't been able to get her out on the road yet because my license is suspended until next month. That's why I've had the time to add all these updates to the car. She really idles Strong rigjt now tho and she sounded soooo fast on that DYNO.

everyone please help!!! What do do u think I'm at! I know we can l agree the DYNO was broken but are my number correct!?

I'll do a DIY thread next weekend on how to cut springs on these cars to lower then and make them more aerodynamic which adds 30 HP.

So

Rogviler · #2 01-07-2018, 12:19 PM

Very good. You are 100% correct.

-Rog

240Dee · #3 01-07-2018, 12:22 PM

I cannot imagine a 240D, no matter what you do to it shy of dropping an srt8 into it, ever being close to HP you figure yours has. 55HP sounds about right for nearing a half million miles, and I’m pretty sure a lot of the mods you described just don’t work that way on a diesel or mathematically (like dropping weight doesn’t add HP) - I could be wrong but this will be an interesting thread to follow.

Sent from my iPhone using Tapatalk

OM616 · #4 01-07-2018, 12:33 PM

Twintake,

Let me start out by saying welcome to the forum.

I have sad news, but the dyno was spot on a 55whp. Given that the engine was only rated at 68HP by the factory, and it has a lot of miles on it, I would say that 55whp is pretty good.

At first I though that your post was a spoof to be honest, but I think you are really serious about what you posted, and if that is so, my first words of advice are, if you are looking to make easy horsepower get another Civic, any MB will require a lot of money to make even 30% more power, and the 240D engine will require even more $$ to do even that.

I own and have modded a 240D engine, I have turned up the pump, modded the prechambers, advanced the injection timing, changed the valve timing, made a resonate chamber intake manifold, had a M90 supercharger on it but then switched to a VNT turbo with an ATW inter-cooler. It is currently in a 201 chassis. It had a bad valve and the head gasket finally went so it is waiting for a chance for a rebuild with a 10mm pump, bigger turbo, and oil cooled pistons.

I also have a 300D which as a 3 liter turbocharged engine, and by looking at it one would think it is the same as the 240D but with an extra cylinder, but there are differences. The factory rated that engine at 126 (ish) and I have seen dyno results in the 140whp to 150whp range after work was done to the pump.

I have seen an article in a magazine that featured a 230 HP (if I recall right) 240D but it had a lot of work done, most of all a big injection pump.

IMOP, given what you want to do, I can say confidently that you backed the wrong horse lol.. The W123 chassis is known to be an excellent drift chassis, but it is heavy and underpowered. It is only after a lot of work and money will they perform as seen on youtube.

I am not sure what other diesels you have worked on to give you the impression that what each thing you have done will result in XX additional power, but they are definitely not realistic as the dyno has proven. That is OK, as long as you are open to learn, there is a lot of knowledge here.

vstech · #5 01-07-2018, 12:54 PM

First off, welcome to the forum.

I think I should move your thread to the performance section of the forum...

Ok.

A diesel just like any internal combustion motor, needs air, AND fuel to make more hp.

You HAVE improved the intake and exhaust...

Well rereading it... it looks like you... removed the intake and exhaust...

Um... do you have pictures?

But you have done nothing to the fuel system.

Any air increase needs to be matched with commensurate fuel...

The mb injection pump can only flow what it is designed to flow.

Contact myna... spend 2K on a high flow pump, and you could get 180Hp or so... if you install a turbo with an intercooler...

Until that very worn out 450K motor fails...

Synthetic oil will not net you any hp...

Lighter chassis will not net you any hp...

A spoiler or wing will not net you any hp...

A 65HP. Stock new motor with 450K on it will need SIGNIFICANT repair to handle any hp improvements.

Bearings, oil pump, timing, and injection pump...

Good luck.

Bengoshi2000 · #6 01-07-2018, 01:06 PM

Welcome to the Forum!

I'm with VSTech... you'll get more help over at the Performance section.

FWIW, the "mods" you've done don't add any hp. They might free up restrictions here and there, but at the wheels I doubt you'd see more than a couple.

vstech · #7 01-07-2018, 01:28 PM

If you want to know the true up your car produces...

Find a level area of road and time how long it takes to hit 60...

22 seconds is stock...

Post your time.

Rogviler · #8 01-07-2018, 01:35 PM

Clearly you can't prank this lot. Serious as a heart attack, 24/7.

-Rog

koooop · #9 01-07-2018, 02:11 PM

A custom CAI that gives a rwhp increase of 34hp?

Uh... Yeah...

Frank Reiner · #10 01-07-2018, 02:19 PM

Quote:

Originally Posted by Twintake

my license is suspended

Not the only thing.

gsxr · #11 01-07-2018, 02:42 PM

Am I the only one with suspicions of unhinged trolling in the back of my mind? I mean, seriously, did anyone read the whole post?

97 SL320 · #12 01-07-2018, 03:14 PM

This guy is all over the place. I'm also thinking this is the same person that wants to build a Ford Ranger + 617 using as many CAT tractor parts as possible.

Also note the last line says " So " , I guessing this was typed up on a their computer then dumped to the forum and it hit the post length limit.

Guess someone got a new computer for Christmas.. . ..

Diseasel300 · #13 01-07-2018, 04:03 PM

Quote:

Originally Posted by Twintake

This is my third soon to be drifting car.

Surely this is a troll...

ROLLGUY · #14 01-07-2018, 04:20 PM

Quote:

Originally Posted by gsxr

Am I the only one with suspicions of unhinged trolling in the back of my mind? I mean, seriously, did anyone read the whole post?

No you were not the only one. I thought it laughable that each mod would get an increase of HP, some more than it has in stock form!!!!!

vstech · #15 01-07-2018, 04:28 PM

Quote:

Originally Posted by 97 SL320

This guy is all over the place. I'm also thinking this is the same person that wants to build a Ford Ranger + 617 using as many CAT tractor parts as possible.

Also note the last line says " So " , I guessing this was typed up on a their computer then dumped to the forum and it hit the post length limit.

Guess someone got a new computer for Christmas.. . ..

I don't think there is a post limit...
I just copied all text and added it to the end of his post doubling the post count...

It stuck...