I'm considering getting some pulleys before I go back to the track this saturday. Renntech is out unless they sell the pulleys separate from the ECU but if anyone knows of other companies and could provide links that would be great.

My plan is to just replace pulleys without ECU and see what happens...

 

Damn man, stealing all my thunder...

First you get my intake now this...

J/K

Seriously though, as soon as my new job starts, I'll have a "few" fun winter projects. Should be well into the 12s by Spring...

Stay Tuned.

As far as the pulley, I've heard good things about ASP. They don't list them on the website. You have to call them direct to get them. EDGE makes one too. Search for them and you shall find.

 

Do a search there are four companies I can think of off hand besides renntech.

1) LE pulley which is the largest most boost.
http://www.letmotorsports.com/
2) ASP pulley same size as the renntech and evo welded outer layer onto a stock pulley.
http://www.aspracing.com/frame.htm
3) Evo little expensive about $1500 but get the extra coolant reservoir same size as renntech.
http://www.evosport.com/product/
4) NEWEST VRP pulley there isn't anyway you could get for a month or two.
https://www.crossfireforum.org/forum...ad.php?t=18757
5) SOON to be out no one really knows about them is the AMS pulley it is going to be the lightest and most fair priced for product.
http://www.abedinmotorsports.com/home.htm

Personally I am going with ASP they are great with communication and stand by there product as well as any of the other major companies ie. Renntech and EVO GOOD LUCK AND LET US KNOW WHAT YOU DECIDE.

 

I forgot to ask how the install of the pulleys was...it looks like everything is easy to access and right in front...is this the case?

 

Least expensive is ASP Racing. They have an 14% overdrive pulley with Dampener (same as renntech and EVO) for $970 - No ECU tune - keep the stock belt - easy bolt on (with a big torque wrench).

http://www.aspracing.com/frame.htm

Ask for part number 331380 (not listed on their website) Here are the pics they sent me.





Then there is a new kid on the block (leading edge technologies) that makes a 20% Overdrive Pulley - but you need a new belt and I found no way to contact him, email, snail mail, phone or fax. Heck I can't even find their website anymore.

And then there is EVO - similar to Renntech - they offer a pulley kits with and without the tune - and with a harmonic dampener and without one.

http://www.evosport.com/product/default.aspx?catid=317

Scroll to the bottom of the page for the kits for our engine.

Good luck and let us know what you decide and how it works out.

 

Erick Gunter
President
Leading Edge Technologies
www.letmotorsports.com
281-787-9691

The Crank pulley setup for the SRT6 is for a 185mm Pulley and a water pump pulley. The other pulleys on the market currently are 178mm, this would include Renntech, Evosport, Kleemann and ASP. If you are not currently running one of the other pulley kits, then you will need to order it with an idler pulley with the LET Pulley setup.

 

Thanks for the info...it looks like on dyno graph in the pic TQ goes down with the pulley? Is that the case?

 

I just made my own pulley set... and assuming I can tune around the custom pulley I'll have an ASP pulley kit for sale. I'll know by the weekend. I sent my ECU in to powerchipgroup with my pulley specs, but it still seems to be running rich, even though I have the new pulley. I think the head work and headers have altered it enough where I need another tune, because the MAP signal is much higher, which results in dumping more fuel. I'm going to try to correct this myself with a piggyback fuel controller, I'll keep you posted.

The ASP kit is nice because it retains factory belt. The pulleys I made produce a 24% overdrive on the supercharger, and it took me nearly a month to track down a belt that would fit it. The other nice thing about ASP is it requires no tune, it works with factory ECU settings.

 

I was wondering the same thing?? The torque actually went down? Hmmm...

 

The torque will decrease with the added size/weight of the larger pulley on the crank, but the supercharger power increase overwhelms it when you're trying to feel a difference while driving.

 

Unless I'm mistaken - TORQUE is the actual put you back in your seat feeling and Horsepower is what carries you through after the torque has fallen usually around 5,250 RPM, so although your car may run quicker it may not necessarily feel stronger but it will be quicker.

 

There used to be a member on here (maybe he/she is still here - can't remember) that had this phrase in their sig:
Horsepower is how hard you hit the wall. Torque is how much of the wall you take with you.

Anyway, a decrease in torque does not seem right to me.

 

Keep in mind this is peak torque, take a look at the graph, the line overall seems like it'll still put you back in your seat.

 

I called them on this very issue - peak torque was recorded 4,200 RPM for before and at 4,400 RPM for the after installation - if you follow the lines on the graph, both HP and TQ remain higher over stock through out the run with the pulley.

I give credit to them for not altering the initial low RPM readings just to make the results look good.

 

I sent you a PM...how hard is the ASP install?

 

O.K.

I have decided on the ASP pulley. I want to order and have it here by thursday. I have a question...

1. If it works with the stock pulley will the ECU still need remapping?

$970 is freaking steep for something so little!

 

torque won't drop with the pulley... it just doesn't sound right...

no the ecu does not need remapping even with the larger LET pulley it does not have to be remapped, but these 2 mods work hand in hand so I don't see why not have it done for a larger overall gain... Other than that you can just have the stock ecu slowly adjust to the increased boost...

 

Okay, some please school those of us not familiar with pulleys.

1. How many pulleys do we have?
2. What are there names?
3. What do they control?
4. Are the aftermarket pulleys larger or smaller?

Thanks for the knowledge.

 

looks to me like on both runs those are just torque spikes, maybe due to punching it on the rollers, and not an accurate measure of actual torque output.

 

Actually I heard that somewhere, on the subject of larger crank pulleys. That was assuming weight difference on an NA engine. I just double checked it, the torque decrease does seem abnormal after all...

Unfortunately when I did my dyno it was a dyno drag day (you line up and they do a dyno one after another for $20 for 3 runs, monthly event) and they said mine needed a different adapter or something like that to measure torque, and asked if I could live without it so they could get through more cars... so I don't have a torque reading, just HP.