I started looking for a pulley set up for my crossfire. I did the search and according to HDDP all ASP kits and Renntech run the 178mm Pulley. LET has a 181mm pulley so my question is has anybody run this set up? Also does this set-up allow for use of the original belt? I know LET has 185 also but I don't want to go that route at this time.I spoke to Erick at LET and thought the 181 uses the origial belt.
Pulley break down 178 = 3 lb boost
181 = 5 lb boost
185 = 7 lb boost

Thanks,
Dave

 

Chi-Town SRT/6 is running the asp pulley kit.He has some great reviews.Just do a search and you will get a ton of info on that kit.

 

no one i know on these or the mbforums has ever tried the 181mm puley...

 

Hawk,
I already know about that kit, I was more interseted in the 181. At a certain point too much boost will cause too high cylinder temps and generate too much overal heat. I would like to go the most boost possible but still run safe. I would also like to find A/F ratios with the 181. I don't want to go water meth injection. Also if anyone is looking for the ASP pulley kits they can be ordered through K1 Motorsports for $899 plus $25 shipping.

 

I'm going with the asp pulley kit.Gonna buy it sometime this winter and install next spring. Thanks for the heads up on K1 motorsports.That's a very good price.

 

I believe they all use the stock belt. If I remember correctly, you are going to swap the crank pulley and one other pulley to make up the difference in size. I believe it is the idler pulley, but I could be wrong.

I thought Erick told me that the Stage I pulley only requires the crank pulley, original belt - but the stage two requires the additional pulley to make the original belt work.

Could be wrong...but that's how I understood him.

SQ

 

Do you have a link for K1 motorsports?

 

Toy,
here is the link http://www.k1motorsport.com/mb/engine.htm. You need to fill out the on-line order form and then pulleys are shipped directly from ASP racing.

Dave

 

Interesting Bulldogger.

I have the 185mm pulley on order with LET and I will now ask a few more questions.

I was looking at pulleys in terms of percentages.

The ASP 178mm pulley increases boost 14% over stock.
The LET 185mm pulley increases boost 20% over stock.

The only time the engine will actually see an increase of MAX boost above what the OEM pulley is capable of providing would during the last 14% or 20% of Engine RPM.

I read on the MB forum some guy who made a 192mm pulley (or something like that) and experienced a problem with fuel delivery at WOT.

I suppose if you were going to be spending a lot of time at the 1/4 mile track with your XF at redline - heat would then be an issue.

 

Brian ask Erick a few questions like how much more HP/TQ the 181 makes over the 178. Also can factory belt be used with 181. I know he uses a fluid balancer in the wheel VS. standard rubber. As far as heat you are always turning the blower faster even at idle with the bigger pulley's , therefore you are always starting to make more heat. The question is at what heat level does it start to roll into the negitive gain area. Also what are the rpm tolerences for the blower from the factory, and what rpm are you achieving with the 181. My thoughts are if the 181 was free and easy horsepower, Renntech probably would have gone that route, I'm not a Renntech fan but the do have their roots from Mercedes so the knowledge should be there.

 

If I remember correctly, the blower is 'clutched', so you wont make any different heat at lower RPM's, regardless of pulley size.

Your heat will only come when your clutch engages...and at that point, you are in the throttle hard and spinning them hard regardless of the pulley size. I don't think the heat will be too significant between the two, unless you are ALWAYS in the throttle with short amounts of downtime (auto-X, etc).

 

ShawnQ,
Forgot about the clutch part, not even sure I fully understand it. Motors I've done in the past were BDS 871's which was constant boost and a few eaton whipples which had the vacuum by-pass. If it is clutched is it always partially engaged? Usually a motor designed around a blower has lower static compression and is a dog without boost. I'm guessing it has some type of electric clutching based on throttle position and MAF readings. Anyone have a link to this style/type supercharger. Thanks.

 

I will do that - I ordered the 185mm Pulley - but I will ask about the 181.

The ASP 178 pulley claimes 20 HP over stock and LET claims their 185 Pulley provides an additional 12 HP over the 178 pullies (without tune) for a total gain of 32 HP over stock - just to give you an idea.
I was told the factory belt works with the 185 pulley - but you need a smaller water pump pulley and idler pulley. Yes he uses a fluid balancer.
These questions would require Ericks response - I am sure Renntech wants to provide reliable - uncomplicated and safe performance mods that don't require a lot of tweeking from the buyer. I am sure that above 14% (178) ECU tuning is required.

I trust in the product and I am willing to try it. I am sure that an ECU tune will be required in order to engage the SC 20% before stock once the pulley is installed, plus I will want to maintain AFR close to save. I am not going to be track racing - just street racing from time to time plus enjoy that added pull when city driving. I also believe that I will need the colder iridium plugs to avoid pre-detonation

 

Well, sort of. Without headers I ran the 192mm just fine. Added long tube headers and the flow rate was too incredible for my injectors. Look for my posts elsewhere for updates on this, currently waiting on larger injectors...

 

The max our superchargers can handle is 20,700 rpm. With the stock crank pulley, we run around 14,500 rpm.

 

Any word yet on the LET 185mm Pulley install?
I will be in the market for a pulley set after the holidays and I am very curious in the difference between the ASP 178 and the LET 185.

I see the differences in the quoted numbers, but I am very curious in the differences at the track or street.

Thanks for leading the way!

Cheers,
Patrick

 

185 LET pulley should be shipping this week. I am hoping for this week or next but if it's late next week it will have to wait until 08 for the install and tune as I will be traveling (to Texas, oh-ye-haw!)

 

Brian,

A bit off topic...but what part(s) of TX?

I'm anxious to hear about the LET pulley myself.

SQ

 

Crawford Texas - my friends son is getting married. He met a cute little Tex-Mex when we were there last year and now he has rented his house out in CA and is tying the knot (Friggin Fool).

Actually my friends ranch is just down the road from Bush's ranch and their shop is (or was) two properties down from Camp Casey in town - it will be interesting to see if they have packed up and left now that Cindy has found better things to do?

Texas aint really my perferred destination (Barbados, Costa Rica, ...) but duty calls...

A little So Cal Hot Rod Action - deep in the Heart O' Texas

 

Thanks Brian for the update! Have a safe trip to TX!

I know what you mean, can't beat going way down south (Honduras, Barbados, etc...) for a little R&R!

Oh yea, I meant to ask, did Erich, sp?? at LET say what they do to the computer when they flash it for the 185mm? Can the fuel system (fuel pump) handle the extra boost on top end...I have heard that it is the limiting factor, but have not been able to find many details.

If not, no worries, I will probably give him a call after Christmas just to touch base with him about the setup.

Thanks again for the info Man!

Later,
Patrick