Wow I could have sworn this was a 2 page thread! No problem, much easier this way. My EVO will be waiting on parts so we will have to wait to get this sent out. I just want to keep you post. As I stated earlier the machine shop wants to make a OE sized pulley to make things easier. Down the line we may develop a underdriven pulley, there should be gains with either piece.

 

I cleaned it up, about 38 posts were either post whoring or people putting their names up for me to add them to the list,

back on topic

 

Im interested. kinda got sad as I got further in and saw they wanted to do OE fit rather then underdrive. Oh well. Its something thats helps and its another step forward for us. 3 weeks and all have money ready and be waiting.

 

Just so were on the same page, I'm interested in the underdrive and not the OE fit pulley. I understand the shop will make this one first, but its the underdrive I'm after, unless you can prove significant gains with the OE fit or maybe I'll get both, OE for winter to get my stuff working when its -40c

 

I dont think this was covered, so here it goes:

The entire pulley system is pretty much driven by the crank. That is, the crank is the output from the engine shaft that feeds power into all the other devices on the pulley belt system. The idea is that by underdriving at the crank pulley, we get the effect of underdriving each other pulley on the system all in one cheap shot. So, by underdriving the crank pulley, in effect, we are giving less power to everything on the belt. That power not going to the accessory belt gets put to the wheels instead. good move.

Lots of stuf is on the accessory belt. This may include the air conditioning compressor, alternator, water pump, power steering, oil pump, etc. I dont think stearing will be an issue, but the water pump is responsable for circulating coolant.

in a high performance (IE: any force induction) system, woud u suggest staying away from underdriving the crank pulley for risk of reducing coolant circulation and increasing overall engine temps? instead, maybe just underdrive the alternator or other less critical devices?

thx!

 

any updates?

 

The largest gains will come from underdriving the crank. Since the engine is doing the same RPM irregardless of what pulley is there then the components will receive RPM either way. As far as less cooling is concerned I would say that as car speed increases the radiator is more of an effect on cooling the engine rather than the water pump. Furthermore as engine speed increases the waterpump will still be pumping more water. I have heard nor read of any damages of a underdrive pulley affecting water temps because spinning the engine less. It is also possible to have too much pressure in a cooling system so keep that in mind too. As long as your car is in good mechanical shape such as good radiator, hoses, and coolant I see no reason to worry about this pulley. I run an underiven pulley in my EVO which as you know is forced induction and I have seen no difference in engine temperature.


As far as everyone's concern on the underiven pulley I originally wanted them to make that. I am still pushing on that notion although they want to send me an OE size prototype to see/feel differences in the car. They may still make a underdriven pulley although they want to see how the car handles the lighter crank first. The stock RA crank pulley is around 7.5" round. Reducing this pulley to say 5" would be around a 33% loss in weight and driving the accessories, this is about what were shooting for an underdriven pulley. The EVO pulley they made for me is around a 25% loss if I recall and it made a differerence. Although there is a lot more room to play in the EVO. I feel pretty good about making both pullies I just want to make sure everything is 100% before any release.

As stated in this thread my EVO is waiting on an intake and won't be in until probably Wednesday next week. That means I may pull her pulley to send it out thursday/friday next week. I will keep everyone informed. Feel free to continue with your questions.

 

I'm starting to get a little concerned. Does the stock crank pulley on the RA look similar to the one in the attached pic?

When I put on the lightened UR pulley on my Eclipse, the gains were noticeable. But it caused the SES light to go on at ~5000rpm almost every time. Even after I removed it after ~15k miles, the SES kept on coming on, giving me the same code. Apparently, it had caused some damage, one of the reasons why I sold my car.

Of those who installed pulleys on their cars, most got the SES light. Do you think that this will be safer?

 

yes this is a different style pulley. It is held on by 4 12mm bolts and is just like the EVO lightweight crank pulley/stock pulley. I have gotten -NO- SES lights in my EVO and if I get any with the RA you guys will be the first to know. Don't forget to remember that this is not a direct money making venture for me, I am trying to bring something new to the RA which is a great car. My goal is 10whp for less than $100. I think that is pretty reasonable if you ask me. So yes this will be safer. There will be one week of hard testing before any order is made. That includes dyno sheets and everything.

 

It's an awesome deal, and a great mod. My sensible side kicked in though, and I wanna make sure that I don't kill my engine this time. And since I don't know enough about our engine or about harmonic balancers or dampeners, I thought I'd ask.

What style are you aiming for?

 

if our pulley is like the evo's.... why not just buy a evo pulley...
i mean they are tested allready...

i had a tbird, i traded it for the ra, i had the full set of pulleys and worked great...
so keep up the good work for those im very intrested on those....

i emailed unorthodox.. they told me that if i had a picture front and sides of a stock pulley (out of the engine) they could see "if" they had something like it... but that was like 2 months ago.....

 

Cuz it costs $127 for just the pulley alone. $100 for a pulley and belts is an incredible deal.

http://www.lancershop.com/customer/p...9&cat=0&page=1

 

What was the code?

 

P0306

 

The EVO pulley would be too much of an underdrive. It would look similar to the one pictured only larger.

I am considered about a SES too and like I said already if it happens then this product will not be sold. Yes Lancershop has a similar pulley so obviously if you see what I am selling it for then you understand their markup. Please be confident in my testing and time involved in bringing this to the market.