water/methanol injection - Mercedes-Benz Forum
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post #1 of 33 (permalink) Old 08-17-2011, 08:21 PM Thread Starter
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water/methanol injection

Hi,

I was looking around youtube and noticed people getting good results with water/meth injection in various SC cars.

Some looked like they were getting 10+ degrees reduction in inlet air temp when using 100% methanol.

I started looking at the various kits available and some look really good (pricey, but good).

As the SC runs hot in the R170, a bit of water/meth injection might do it some good.I have the ASP pulley, which runs the SC even hotter then the standard pulley.

Has anyone tried this before? What results did you get? What kit did you try?

Cheers
Luc
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post #2 of 33 (permalink) Old 08-17-2011, 09:35 PM
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looked at them too but...

1) spraying before the s/c into its intake will strip the teflon coating off the rotors and cause them to flake and crap going into the intake. go online and see some pics not pretty

2) our cars use a MAF sensor so spraying at any point BEFORE the MAF sensor will shorten its life significantly and possibly destroy it.

only place to spray is right after the MAF sensor next to the throttle body

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
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post #3 of 33 (permalink) Old 08-17-2011, 09:42 PM
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you may initial see slightly higher boost reading initialy as the water will help seal the gap b/w the rotors.. but after a while using it the teflon will be stripped off and the gap b/w the rotors will be INCREASED so you will loose boost

edit: spraying is fine for aftermarket s/c's and they have a tougher and harder coating. the teflon coating used in OEM applications wasnt designed for that use and will come off
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- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator

Last edited by Subby_; 08-17-2011 at 09:59 PM.
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post #4 of 33 (permalink) Old 08-18-2011, 08:40 AM
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Luc, you might want to edit your profile to show what model car and location you are in.

Reason, there are some replies that may/may not be appropriate for your particular car. ie: the SLK32 doesn't have a MAF.

As far as the rotor coating: I took my supercharger out to clean the intercooler & intake manifolds and can tell you that the teflon coating comes off without water/methanol also, as mine was stripped clean and there was gold color residue in the intercooler. I don't run a methanol kit...
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post #5 of 33 (permalink) Old 08-18-2011, 04:29 PM
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Originally Posted by Subby_ View Post
... only place to spray is right after the MAF sensor next to the throttle body
That's where i would want to spray... tap the intake tube and spray into the TB. Since the car isn't going to get a tune with the water/meth, you won't see a huge gain until outside temps get into the 90's and up.
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post #6 of 33 (permalink) Old 08-18-2011, 04:30 PM
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wow.... do you know what rpms your unit spins at with your pulley combo? excessive heat in the unit may cause the coating to come off?

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
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post #7 of 33 (permalink) Old 08-28-2011, 04:56 PM Thread Starter
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Hi,

I have a 2003 slk230 rhd model. I do not know if the rotors in my supercharger have a teflon costing. I believe they put in the smaller m45 in my car which is on full time. If the costing comes off easily, I would suspect there would be a filter or something to prevent it from getting into the engine and causing damage?

Can you post some links of people that have had these problems with meth/water injection. I did a search on youtube and google and could not find any, where the coating came off due to the water/meth injection. I did find some links and videos of before and after shots where the meth/water injection cleans the parts that it comes into contact with.

I would also advance the timing with water/meth injection as there is more power to be had by doing that.

Cheers
Luc
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post #8 of 33 (permalink) Old 08-28-2011, 05:38 PM
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alan the rotors were stripped clean? this is why i havent tried the howerton kit as i was afraid of the long term effects but if the coating comes off anyway whats there to lose except high heat temps!

subby heres some info i found on the xfire forum. same engine as buggin and mine and we both run the same c3 pulley
"The MAX RPM our SC can spin is 20K but that will distroy it quickly.
MAX safe SC RPM is 15.5K to have any chance of a long life.

Let's calculate SC RPM.

Crank / SC = (Ratio) * Engine RPM = SC RPM

155 / 74 = (2.10) * 5.8K = 12,180 SC RPM (Factory)

178 / 74 = (2.41) * 6K = 14,460 SC RPM

181 / 74 = (2.45) * 6K = 14,700 SC RPM

185 / 74 = (2.50) * 6K = 15,000 SC RPM

Code 3 pulley = 65mm (so I've read)

155 / 65 = (2.38) * 6K = 14,280 SC RPM

178 / 65 = (2.74) * 6K = 16,440 SC RPM

red would be what we are running so about 2100 over oem max rpm's

Last edited by 32krazy!; 08-28-2011 at 05:42 PM.
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post #9 of 33 (permalink) Old 08-28-2011, 06:38 PM
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from what i've seen its not even a teflon coating its a high temp epoxy coating on the rotors - i cant speak for the charger on the SLK32 though.

if its spun at factory specs it should be fine but the reasons for it to fail are;

Small fragments of dirt and debris may have found their way past the filtration process and cause pitting and delamination of the rotor coating. Other causes of delamination include water injection, excessive rpm, heat cycling and general wear and tear.

more likely reason is high RPM and the heat as a result of that. for a roots blower like on the SLK230 they generate heaps of heat when spun harder, but the SLK32 is a different type of blower it actually does the compression of air inside the s/c itself.

lots of heat = causes stuff to expand = rotors touch = start to scrape and material flakes off... the tolerances are so tight!

the M45 from the newer SLK230 is already spun quite high rpm (still within recommened safe specs) from factory and there isnt much room to move. its close to its limit already

i spin my eaton M62 at 14,500rpm but it is ported... safe factory redline is 14,000rpm. ive done this for few mths now and no dramas

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
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post #10 of 33 (permalink) Old 08-28-2011, 06:48 PM
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oh just checked one of the rotors in the SLK32 is indeed teflon coated...

i think they spin close to 20,000rpm stock? 3.3 times crank speed (max rpm 6,200) = 20,460rpm stock form.

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- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
Subby_ is online now  
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