How many mile have you been running it so far?

 

I've been spinning the belt for around 10,000 but have only been making boost for around 6,000 of that.

 

70WHP/TQ is nothing to sneeze at! I bet it is a blast to drive. I'd be grinning ear to ear everytime I put my foot into it!

 

I was for the first month....now it feels slow lol

 

You need a MadMax/RoadWarrior button like mine!!
Turn it off for a few days... then back on.. and WHAMOOO!! :clap:

 

I have one; well mine is a switch lol.

 

Just to touch on the dyno talk... it also looks like dynojet vs mustang dyno? I can hardly see your picture on my phone skidd but that could very well be the difference..

 

The 2000 grind cams shifted my powerband up. I bet if I were to dyno starting at 3500, it's shoot straight up just like Skidds. We both were using dynojet settings, but mine was a road dyno rather than an actual dyno.

 

awesome man! you did a great job

 

I have a 7" crank pulley. And the stock magnetic clutch on my Mercedes M62 is 3.625".
7 / 3.625 = 1.93
I have a 6500 RPM redline, so
6500 * 1.93 = 12,545 RPM at the Supercharger.
Even with the stock 6250 redline, it's still
6250 * 1.93 = 12,062 RPM.

As for the 10psi question, the M62 is very much capable of producing 10psi, depending on the CFM requirements of the motor it's attached to. Remember, a Fixed Displacement Supercharger can only move a fixed volume of air per revolution, and that volume is affected by how much pressure it's pushing against, as well as it's RPM. If you stick an M62 onto a 500cc motor, it'd most likely be able to product 20 psi of boost, and a crap load of heat. But, on our 2.5L motors, and it's "estimated" 270cfm of pumping capacity, the M62 needs to push quite a bit more air to generate even just 6psi (which is closer to my actual boost level)

Theory is all find and dandy, in fact it's pretty important. My first attempt at calculating the necessary pulley ratio I needed for 5psi, produced a whopping 2psi. Even though I tried to account for pumping losses and such. In the end, trial and error got me my target of 6ish psi. A 1.93 pulley ratio. I think a 2.0-2.2 pulley ratio is a very good number for an M62 on an EJ251.

 

I have a 7" crank pulley. And the stock magnetic clutch on my Mercedes M62 is 3.625".
7 / 3.625 = 1.93
I have a 6500 RPM redline, so
6500 * 1.93 = 12,545 RPM at the Supercharger.
Even with the stock 6250 redline, it's still
6250 * 1.93 = 12,062 RPM.

I guess things don't really look too far off. Especially if you are making 6 PSI and not 5. I know 1 PSI isn't much but at these boost levels it's 20%. I was looking at the M62 that comes on Bonnevilles and Rivieras. From what I could find online they have a 3" pulley. This would put you at 15k RPM at redline I bet it would at least get you close to 10 PSI.

I have always been a turbo guy and have thought about turbocharging my 2k 2.5RS but this looks like it could be pretty fun cheap and easy.

 

I have been looking at the cobalt SC. Doesn't look like they have a clutch but I am pretty sure they are 4th gen. I don't like that long inlet but I think I would just cut it off and weld on a flange for the stock TB.

 

Damn Tristan, the hood and headlights came out perfect. Maybe you should post what you did to achieve that......

qouted from FB , "I sanded with 800, 1000, 1500, 2000 and then normally you would clearcoat but instead I used Helsmans Spar urethane at a 50/50 mix with mineral spirits."

 

Well, you quoted for me so I guess I don't have to haha. I wish I had taken some before photos for comparison.

I actually followed this thread:

http://www.autogeekonline.net/forum...ine.net/forum/show-n-shine/19021-headlight-restoration-new-uv-sealant-idea.html

I used this method on my headlights and they turned out amazing. I figured I'd give it a try on the hood, so I pulled of the scoop and tried it. It turned out just as awesome as the headlights did. That's when I went ahead and did the entire hood, though a lot harder than the headlights and scoop I got it done as well.

 

9.1" Crank Pulley? Schweet!! try not to stay at redline for too long a period, your SC will be spinning at almost 18krpm.

 

Agreed; I'm keeping the redline at 6200; another reason why I need to get these cams out of the car....they are basically useless.

My math says differently though...unless my math just sucks.

9.1/3.9371(100mm) = 2.3113 (pully ratio)
2.3113 x 6200rpms(redline) = 14330.35 rpms

 

Turns out we were both wrong.
I miss-remembed what the Mercedes pulley diameter was. it's 3-5/8"
3-5/8 = 3.625
Thus, 9.1 / 3.625 = 2.51
6200 * 2.51 = 15,564 rpm.
So, you're safe.

 

Got ya; I had written down the Mercedes pulley was 100mm so that's the data I was using. I blame the internet haha.

 

awesome build!

 

I hit 10psi today....but only until the supercharger got nice and warmed up. I think the only way I can pull off a constant 10psi is to built some sort of water tight icebox around the supercharger; just glad I'm making progress. I love this colder denser air

 

your probablly better off with delta 1500s. thats what they recommended to me as a blower cam and thats what i have but i havent gotten a chance to get the engine back in the car yet.

got any close ups of your idler pulley setup? need to figure out sometihng to do with mine. yours seemed to have the best routing and placement.

 

This is the only picture I have of it off the car:

click it and it should get bigger

 

I ment more like close ups on the car. Should of mentioned that lol

 

Starting model

Hi,

I have just seen your project thread and wondered what your starting model was? I have a 2.0L 2001 impreza sport that I bought before I realised that turbocharging the engine is more difficult than it is on an MX5. As it is going to take more effort than expected, I wondered what the possibilities were for supercharging? I know you can do something with the Mercedes C230 supercharger on some models, but I don't know if this is possible on mine.
Any advice on this would be most welcome.

Cheers,

Tom

 

Hi,

I have just seen your project thread and wondered what your starting model was? I have a 2.0L 2001 impreza sport that I bought before I realised that turbocharging the engine is more difficult than it is on an MX5. As it is going to take more effort than expected, I wondered what the possibilities were for supercharging? I know you can do something with the Mercedes C230 supercharger on some models, but I don't know if this is possible on mine.
Any advice on this would be most welcome.

Cheers,

Tom

Tom,

My car is a 2005 2.5rs. There are guys who have done the same build on different motors of various sizes. There's no reason you can't do the same build on your car. There will more than likely be a few changes that would need to be made, but nothing drastic from any of the m62 supercharger builds here on the forum.

 

Don't think he stuck around for an answer....his last activity was the same day he posted this....

But if he does decide to come back, an M62 SC'r on a 2.0L would be awesome, run the same pulley ratio and have more boost.



~Josh~

 

I've recent discovered that my bearing in the front snout area of my supercharger had failed; not sure why it failed so early but either way I'm needing a replacement. I've found a potential replacement for much cheaper than any other bearing I've found online yet.

30BG04S13-2DST2 A/C Compressor Ball Bearing 30x47x22: Amazon.com: Industrial & Scientific

I've ordered one and will give an update on the fitment when it arrives.

 

You sure that's a good choice for a replacement? It's listed as an A/C bearing. The AC Compressor doesn't see nearly the load or HP draw that an SC does. I'd hate to see you have to replace it again in a short time to save a few $$.

 

it's the only one I could find and other sites listed it as the SC bearing replacement but double the price.

Automotive - Shop By Part - Supercharger - Individual Replacement/Rebuild Parts - Electronic Clutch Bearing - Mercedes-Benz - KWIKPHYX

https://jonbondperformance.com/index.php?main_page=product_info&cPath=15&products_id=348

Figure I'll get the same thing for half the price because it's being advertised as an AC bearing rather than a SC bearing.

 

I'm also working on rebuilding the clutch on the supercharger. The OEM plastic setup just doesn't hold up well or this one had seen some significant use prior to my ownership. Either way, I've torn the whole thing down and removed all the plastic parts. I plan to rebuild it using metal parts and small screws/nuts to secure it back together. Will weld only if I feel like it's necessary.

I'll post up pictures later on when I get the project moving. (Hate not having boost....)

 

Wirelessly posted (Andriod: Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; One X Build/JZO54K; CyanogenMod-10.0.0) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30)

I recall paying about $35 ish for a Natchi replacement Bering from a guy on eBay. I'lllook to see if iI still have a link.

 

I looked through and found the link you had posted before. The guy is only selling them in rebuild kits now.

I looked up the natchi bearing part number and found 30BG04S13-2DST2

Just found it on ebay finally: http://www.ebay.com/itm/Mercedes-Na.../171020223542?pt=Motors_Car_Truck_Parts_Accessories&hash=item27d1998436&vxp=mtr

 

Nice build.

i have to consider a custom crank pulley now. does your setup use 2 belts or 3?

i want to keep the mpg good. so the clutch on the snout pulley is helpful. how much was your crank pulley? can you get another one?

how does the power steering pump hold up to spinning faster?

i plan on making brackets like Skidd, Delicious Tuning ecu, wrx injectors, wrx bov, forester tmic, m62 from a merc keeping the throttle body in stock location.

so a 9.1" crank pulley is good for 10psi and 15k s/c rpm? thats sweet.

i hope with some tuning and pushing this to 15k s/c rpm with ej25 6200rpm i can make 220whp 230tq on a mustang. have e85 up here too.

i need more power for winter and rally x

 

I haven't been around much these days with school, military obligations, and my eve online gameplay.

My setup uses 3 belts. The supercharger has it's own belt. The pulley came from Skidds contact guy in Nevada I think it is, but I can't remember his name. You'll have to get ahold of him and get a price quote on a pulley. The pulley is designed to use a metco mustang pulley. Crank Pulley Ring, 2003-2004 Mustang Cobra: Metco Motorsports

 

small update;

I currently do not have any of my supercharger parts on my car :S. My mother-in-law backed up into my car a few days ago so I took it off along with the bumper to make repairs. I'm considering going back down to the 7.4" pulley and not running an intercooler. I am curious if any of our other supercharged guys have recorded temps so I can get an idea of what kind of increases at rpm levels of the supercharger.

I found this data on a RSX forum:

All About Blower Efficiency - Club RSX Message Board

but not sure how much I can rely on it. I'm not sure I believe that the supercharger adds 60F to the temp when it's spinning at 4500rpm. I dunno that seems high to me but some input would be nice.

 

I don't have any good numbers for you, but I can tell you that the roots blower SUCKS ASS when it comes to adding temperature to the air. It's the worst offender of them all.

 

I've read that 130F+ air temps on a boxer motor is pretty much the worst thing you can do. If that's the case then running without an intercooler at any amount of pressure with a supercharger is a bad idea.

 

What was/is your tuning strategy for your 2005 - timing and fuel map adjustments? Or do you have an aftermarket fuel pressure regulator ect..?

Would you be willing to share your rom-raider maps (for study only)?