interesting...

 

i certainly hope so....i am getting close to upgrading to the LET 185

 

indeed so.....indeed so

 

I'd sell your sc pulley and go with a 181 max. The combo is going to prove costly for someone. Like motor going bye bye. The SC frying up is one thing, but the motor is a different story.

 

Im not big on the stacking pulleys idea due to possible belt slip of the smaller s/c pulley, so i tend to agree with cruizinquick. But i cant confirm the 185 to be an engine killer by any means, i think its a combo of the 22psi boost it provides and my modded manifolds with not enough fuel to support. I think dumping more fuel in is the answer but in the next few weeks i hope to have this thing figured out...

 

Could a Fuel Management Unit (FMU) be used to provide the additional fuel needed while under boost? Wouldn't affect "normal" driving just boosted driving (which for some of us is always).

 

funny you mention that Evan....I was thinking about it last night and decided I may go with the 181 because of people running out of fuel or w/e the problem is topend. I don't want to risk the 185 yet until it is know FOR SURE what the problem is running it.....thanks for the suggestion!

 

yah Im not a fan of the idea either....granted, I do have a Code3 Belt Wrap Kit to stop (or really limit) the belt slip which would be used (as Brandon of Code3 told me) to run stacked pulleys. However, as per AirFrcd's post on mbworld, it looks like stacked pulleys will either not safely happen or required a bit more R&D........

as far as the 185, im not necessarily concerned about it being an engine killer, but I am not liking how it runs really lean or out of fuel or SOMETHING uptop when it loses power.

OUT OF CURIOSITY: has anyone compared trap speeds OR dyno results with a car with a 181 TUNED and a car with a 185 TUNED to see how the topend drop off on the 185 really compares? I mean, if it is really dropping off, wouldnt a car with a 181 tuned potentially outrun or outdyno or outtrap a car with a 185 tuned (of course, minus manifolds, injectors, or whatever might be the problem with cars with 185s right now)

 

The only one who has a successfully 185mm setup without fuel issues is BrianBrave. He don't race, but does say he canyon drives hard. So he has to reach full boost at some point. BrianBrave chime in and give your 2 cents. You are also the only one who has the 185mm and a Speed Innovations tune. Or any other tune besides a LET tune. Does anyone with a 185mm have an InMotion tune?

EDIT: Brian did respond on 240's thread, no issues with his tune.

 

No issues with my SRT6 ten months later - very happy - 21 PSI of boost at sea level - never had a CEL, IAT issue, engine cutoff or limp mode.

When I first installed the 185 pulley I was concerned about running lean (per the MB owners) but with the factory tune, 185 pulley, SL55 intake and iridium plugs (no other mods) - My A/F ratio was 10.5 and climbed to 10.8 at 5800 RPM when I went in for tune.

Perhaps its the SRT6 external fuel pump VS the C32/SLK32 internal fuel tank mounted pumps?

If my SRT6 can run that rich with a 185mm pulley - then only a tune or some other after market modification can make your SRT6 run lean or to run out of fuel at WOT - - IMO.

When my ECU tune was set - I ran a 12.5 AFR @ 6150 RPM with the O2 sensor placed deep into the tail pipe. That was 2/9/08 on a DynoDynamics.

I would suggest data logging, an AFR gauge or putting your SRT6 on a dyno prior to any performance mod to get a baseline reading. Then install the pulley and get another reading - then have your SRT6 tuned and more readings.

Dyno's are the best because you can see the before and after results and rest assure your SRT6 is running correctly.

 

BrainBrave doesnt have modified or aftermarket manifolds. I believe that makes a signifigant difference in AFR if you ever looked down the tiny stock plenums. Just a side note.

 

just the manifolds cant possibly be the difference in him being able to run without problems...im sure that there are people with the 185mm setup without the larger manifolds who are having problems as well......it just seems like there arent any issues with the 181. idk

 

It's the tune IMO, but also to get accurate AFR readings a new o2 sensor should be installed between the 1st and 2nd cat, and also it has to be at the right angle.
The only way to really see if BrianBrave's tune is optimized for the 185's full potential is a few little 1/4 mile runs to see if 11's are obtained.

 

Interesting point. Someone has to look at the Part-Nr.of the fuel-pump of the SRT-6. AMG recommends to use a bigger fuel-pump when the factory speed-limit of the SLK32 is set to 280 KM/H, because otherwise the car would lean out at top speed. By the way, the bigger fuel-pump is the one from the SL55 AMG, which AMG installed on my SLK32 at the AMG-Headquarter in Affalterbach. The AMG-Part-Nr. of the bigger pump is A0014704794, the Manufacturer of the Pump is Pierburg (Nr. 7.00228.51.0.) I would suggest to take a look under the car and double check the original AMG-part Nr. This fuel-Pump is mounted outside the tank! The C32 uses a different fuel-pump which is mounted inside the tank. The pump of the C32 does not need to be changed if you delete the speed-limiter. Hope this helps.

 

Yes, but Brian has the same pump as 240 and doesn't have the same issues.

 

In my opinion, like Brian said, there are no fuel issues with the 185mm Pulley, a proper tune in combination with the stock manifolds. Jerry of LET also tested this when the 185mm pulley was released. The problems appeared, if one tried to go even bigger than with the 185mm and I think the aftermarket manifolds also make a difference.

I'm not starting a new 178mm vs. 185mm thread, but I am also very happy with my Pulley-Configuration which is a 178mm ASP with 71mm downsized SC-Pulley. Its about the same Ratio like the 185mm. No issues, no problems so far.

 

Are you able to put down 1/4 mile times? Unfortunately that's the only number we can compare it to, of course with knowing the DA with that time is also crucial. I doubt your slower than with just the 178mm, but the ECU can take out timing if it don't like your numbers. It may still seem fast. Datalogs would be great so see your numbers througout the shift points just past 4th at wide open throttle.

 

Its snowing here in Germany No 1/4 mile. I logged my timing, IATs and boost a lot. Its all about how long you stay on the throttle. 1/4 mile is no problem because its only about 11-12 Seconds WOT. No timing being pulled. The problem is when you are longer on throttle especially in 4th and 5th on the Autobahn when you really drive hard under Load. Then the IATs will rise and you have to do a lot of cooling mods to fight against it. But in daily driving or a short blast up to 140-150 Mph everything is fine with the 185mm. Very fast building boost in the low and midrange and immeadiate blast when you kickdown. This is fun and the most important thing for me in daily driving.

 

What's the highest boost you've seen? I'm guessing 21-22psi. That seems to be the threshold. Is your SC pulley different than what Code 3 sold here? Finally who did your tune?

 

Highest boost I have ever seen was 20,6 PSI, when it was very cold outside (5 degrees Celsius). On a very hot summer day (33 degrees Celsius) I saw 17,5 PSI. 2 of my catalytic converters are removed. I use the stock SC-Pulley which was machined down from 74mm to 71mm. Its not a Code3-Pulley.

My tune is from the German "Tuning-Pope" O.Neumann / from Evotech Germany who did my ECU and TCU.