shardul

iTrader: (1)

I purchased a Redtooth Racing crank pulley yesterday. The Kit come with the following. I plan to install it today. Torqueing specs are same as stock crank pulley.
1. Crank Pulley with outer ring as per your choice. I got a 190mm. From what i understand custom and additional ring sizes are avaliable.
2. Lightweight water pump pulley
3. OEM AMG Crank bolt
4. Gates Belt

Below is a comparision on the weight. ENJOY my friends!!!

ASP 180 weighs in at 14.5LBS


ASP 190 weighs in at 15LBS


Redtooth Racing Pulley with 190mm ring weighs in at 10.5LBS (Same as Stock Pulley)

shardul

iTrader: (1)

QUESTION OF THE DAY FOR ALL THE NUMBER CRUNCHERS!!!

4.5lbs to 5lbs off the crank equates to how much RWHP?

Bramage

I just pulled off my 180 ASP pulley and it weighed 13.5LB. The new ASP 190 weighed 13.1lb. (Digital bathroom scale)

I was not looking for or expecting a weight savings, both are steel. The holes around the circumference of the pulley are the same size, just more of them on the 190. I was pleasantly surprised

chawkins2001

Even 4lbs of rotational mass is a ton of savings. I bet it frees up at least 10rwhp or so.

ahmad0658

Shardul, How much did it cost you?

JoshM813

Its about 10-15 whp across the whole power band

KLR CLS

how do these install? can you use the factory style crank pulley holder or do you need to lock the flywheel?

shardul

iTrader: (1)

lock form flywheel or make a tool like this (courtesy Exotic-Metal55)

GregMB

Shardul,

Do you happen to know what the O.D. & wall thickness is for that keyed portion of the tool??

I might already have tubing scrap that's the right size in my workshop.



-G

adianaty

Not sure how some got to 10-15 hps with this but the power freed up will be dependent on the gear. And I'm saying freed up for a reason since there is truly no power gains to be had. Its just that we all mostly do pulls on an inertia dyno and this changes inertia. On an engine brake dyno, this would show nothing. In first gear because the engine accelerates the fastest you would see the most benefit and nearly nothing in 5th. Its no different than changing a flywheel except the diameter is alot smaller so the effect is not as significant. My guess is that on a 3rd gear pull it would equate to a few hp's but not much. I can do the math but I would need some details from you Shards on the dimensions of the pulley so i could get a proper moment of inertia. If the full 10lbs is all on the outside edge vs directly in the center, that makes a big difference too. Send over the details and I'll put a spreadsheet together.

AgSilver

You are absolutely correct and while you cannot change the laws of physics as H.G said "it's the little things..." and all the little things add up.

adianaty

That's why when I upgrade to a 190 it's going to be one of these for sure.

Another great innovation from the Houston crew. Bravo and keep them coming!

Exotic-metal55

I was trying to run some moments as well. Take 190mm at 15lbs and 190mm at 10.5lbs. Both have steel hubs but one ring is steel and the other is aluminum. Granted, we do not know what the weight is on the outer edges of the 190mm but it is alum. VS steel .. So how much inertia is added at 6000 rpm? 4.5 lbs is added to the stock hub on the pulleys that weigh 15lbs.

Exotic-metal55

Did you use the tool or hold the flywheel?

lowprofile

Are you sure the first photo is a 180mm? It looks way smaller than the 190 in photo 2.
I've weighed the ASP and stock pulleys too, but on a postage scale. The ASP pulleys I have measured come in around 13 and a half pounds depending on overall size. Stock was approx 10 and a half.
Anyone notice the botched install on the first pulley? Yikes!

Just wanted to add, photos and weights aside, I believe you have a great product on your hands.

shardul

iTrader: (1)

Yes it is a 180mm. Btw it is the one that someone sold to hammerdown

lowprofile

WOW! Hard to believe someone would try to pass that off.

Hammer Down

I thought that looked familiar, just written off as a loss