I have the JCW package with the 19% pulley, GIAC remap, 380cc injectors, alta intake, webb exhaust. I am considering doing a crank pulley. What size should i go with and will this break anything on my car in the long run. Can someone tell me the advantages and disadvantages of a crank pulley.

 

I just added a 2% M7 Pulley a couple days ago and I love it. The boost comes on faster and the car spools up quicker do to the lower mass. But going to 2% did max out my supercharger RPM's quicker. So I shift at 6500rpm instead of 7000. If I were you I would get the 0%, because you already have the 19% pulley and if you go more 19%, then you will just over spin your blower way too early. Even with 0% you will feel the difference on how the car pulls to redline. I know there is a lot of debate about this mod, but there are thousands of them installed and maybe a handful of bad cases. Thats less the .05%, not bad in my book. Plus it is a cheap mod.
Mario

 

overspin too early?

what is this you speak of? I make hp all the way to redline....

 

get one with a balancer if it is on the market... MINI put a balancer on the crank for a reason. I have seen a complete engine failure due to a crank pulley without a balancer. The bill was huge. The risk MAY not be worth the extra power...

I personally wouldn't spend money and time to put on a product that has been known to cause catostropic engine failure all to get a handful of hp.

But... others will disagree with me and say that they haven't had any probs... which is true... but if they have seen what i have seen...

Im not saying that you WILL expericance engine failure... but you defintely increase your chances...

 

I am with isellem on this one. I currently have a car in the shop with a rod through the block. I do not now how it happened but it did come to me with a 19% pulley and 2% crank pulley. This combo spins the s/c 26.19% than stock and brings the effective redline of the engine down to 6780 rpm, assuming the s/c rev limit is 17,200 rpm. (There is a lot more to the s/c redline story but I’ll leave it at that.)

 

Wow! I thought 19% was pushing the limit of our superchargers. A 19% SC + 2% CP sounds crazy. I have a 15% and have been waiting about a year now on doing a crank pulley. I wanted cars with CP to get more miles on then and reviews to start coming in.

The car in your shop is the third one I have read about in the last week that through a rod with a lightened crank pulley on the car. I will say that no one can say it was the crank pulley directly nor were the mods or HP posted on these said cars.

That said, I was thinking of adding a 3% CP to my 15% SCP. I really am not sure now. I may just replace my 15% with a 17%.

Longboard

 

If your car is an 04 why don't you get an 05 - 06 stock crank pulley which is 2 + lbs lighter than the 04. Plus you still retain the damper.

 

Because i want my car to have a 23% SC pulley, but no one makes it, oh well, guess i gotta go 19+4....

 

My thoughts on the subject are similar to most. This mod is fine to do as long as you know the right combination of pullies to use. With a 15% SC pulley you can go up to the 3% CP, at that point you are reaching the limits of safety though. Same thing with a 16% SC pulley. With a 17% SC pulley you are hitting limits at 2% CP and with a 19% SC pulley you should only do 0% CP if any. Its proven that at 19% SC pully yuo cannot track the car due to the water pump. I dont know why anyone would go over that because its just not safe for even daily driving. A 19% + 2% is a combination for diasaster and leaves no questions why the engine in that car threw a rod.

BEATNUT

 

Rick, I just had an idea, remove your SC pulley and file grooves on the shaft and run a really short belt. You should be good to go at t hat point.

BEATNUT

 

I was thinking about it.

I would do it if there was enough surface area, but sadly there isnt enough on the shaft.

 

Hahaha.

Beatntu

 

I agree.

The 19 + 2 just sounds nuts in my opinion.

Longboard

 

hrmm...

Ive had my 19+3 on the car for about...well... its been probably 15k now that i think about it.

I redline daily, sometimes all 6 gears. autox every weekend, drag race every wedensday and i put 500 freeway miles a week on.

NO PROBLEMS!!!

I guess i'm the exception to the rule..

 

no i wouldn't say that you are the exception at all!

you just dont know what/when you have MAY have coming!

Good luck! I don't wish a rod/crank failure on anyone!

 

Well, rods typically don't go out the side of a block unless you detonate severly... like say on a twincharged car, or a car running stupid high cylinder pressures... or unless the crank experiances a really bad vibration.

 

Well, Last time i checked the motor is still doing just fine.

No excessive bearing wear on the bottom end whatsoever.

If it blows it blows, its an excuse to go bigger and better. Bore, stroke, wicked cam and a "new" SC..

 

No, I think you are trying to break your engine to give yourself an excuse to upgrade the pistons and throw a TC'er on there...

BEATNUT

 

Hey you said it, not me.

 

19+3 %, man you are one lucky dude. I would be happy with that if I was you. Are you sure that your belt is not just sliping at hight RPM. What about your Alternator and water pump? No problems with overtemperature? I just can not see it working that long. Have you looked at your bypass Valve. Is it closing properly? If it is not, you could be losing boost and that might be saving your engine. Like someone said, maybe you want a new bigger and better engine...

Bomboasy

 

i have a block off plate on my bypass, so no lost boost.

nothing is slipping, everything is fine.


I really cant see why everyone raises hell over something so stupid and little as a crank pulley.

 

I have a 0% Alta and want the 05-06 if some one wants to work a deal.....

 

spiderX
Hey Bob
Did you call Chad at Detroit Tuned. He may have one. I'd also give Randy a try. Who knows he may have one. He seems concerned more about his business again.

 

talked to Chad about a month ago... have not talked to Randy.... talked to Peter and Eric so far "no joy"

 

I'll check the engine block I have. I'm not sure if it's an 04 or 05. Foorgot about that thing in the back of the garage. I'll also check with my tech at the dealership.