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I want to lose hp, can anyone help? Modular pulley question.

SaukRapids

SaukRapids

I can't car too good.
I'm new here, clearly. I've verified that I can order a stock 3.8" pulley should I decide that a 3.6" isn't right for whatever condition (Minnesota winter, or a long trip for example).

I'm wondering if there are larger pulleys. I'm very familiar with these engines and the Eaton M90's bearings longevity aren't my concern. What is a concern is how the engine might behave under lower pressure. I have more than enough info for running tiny pulleys.

Any input is appreciated.
 


not many bother to pulley up. name of the game is to run a smaller pulley. unless top swapped and untuned with stock exhaust manifolds still.

these blowers run for hundreds of thousands of miles issue free. my gen 3 is up 240,000 now.
 
They make a 4.0 pulley if you wanted it I guess.

A lower presssure just means less power because less boost, nothing else is going to change. It doesnt matter if you run a 2.8 or a 4.0 and you are out of boost, the BBV will just vent anything that is not needed. It acts no different in the end, so even running a larger pulley on a long road trip will do nothing.
 
"the BBV will just vent anything that is not needed. It acts no different in the end" - That's partially what I was looking for. I'm not concerned with heat or wear, but mileage. I'm aware of KR in an 05 Comp G and understand the other things needed to run a 3.6" or smaller pulley.

Scouring the internet is what brought me here, btw. Having valid responses already is great! Thanks.
 


CrazyGuy03 said:
I really want to help but im super confused to what is going on here
Click to expand...

Basically, I was asking if running a larger pulley would increase mileage and make the car more manageable through the foot of snow we see here at least twice a year.

I'm finding that the answer to my question is "No. Lowering boost pressure with a larger pulley won't help mpg." From what I gather, the jist of it is that even if I made Eaton M90 spin slower while the engine is using boost, it won't help much more than keeping my foot out of it.
 
Yeah I guess you could zip tie the bbv open so it can't close and make boost. I don't see why why it's an issue if you run premium gas and don't knock // I've ran my Buick through snow. I didn't blast the tires off but it spun as much as any other car would.
Then I got snow tires. They bite hard but of course you can still spin them too. It's just not going to slip as much as an all-season would.

I think you will be just fine with a set of good snow tires
 


Yeah, once I thought about the BBV I realized I was overthinking. The old man's an engineer, so that might explain the randomness. Thanks for all the help.
 
I cringe every time I hear blizzaks are the cure to winter traction like chicken soup cures the damn flu lmao. Marketing propaganda trickery !!
 
Blizzaks are overpriced. I'd never buy them.

Nitto snows or whatever cheaper brand will work just as good for just about anyone. Any snow tire is better than a all season in the snow.
 
Exactly. I personally look at the tread itself. The chunkier the better. The directional patterns look nice but that "bite" isn't there

ive personally owned cooper/hankook/blizzak and firestone(winter force?)
I listed them in my order of preference
 


It might just be AK but they live up to the hype up here. Honestly, I went from goodyear ultragrips to blizzaks and the difference was insane. I had to really try to go sideways after the switch.
 
I haven't tried Blizzacks. If stock 16"x6.5" wheels clear on the comp g (I'm guessing they do), 215/65's come in decent AT's. You'll lose .4" on the width, which is better for deep snow and the inevitable brown sludge/slush anyway. Speedo will be +1mph at 65.

I haven't finished pricing, but so far they're at a small premium over cheap snow tires. The advantage is the price on cheap steel, 5x115 bolt pattern wheels which are a breeze to repaint. Yeah, I'd imagine noise will be an issue, but the similar tires I run on my old Blazer have lasted 3 years full time. I'm hoping a setup like that will last many snows.
 
I've been running snow tires on my car every winter since 2006, and I think as long as the tire is rated for M+S it will do fine in the snow. I don't know for sure, but I would suspect the torque star wheels would clear your comp g brakes.
 
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