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

[SaukRapids]

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.

[Scottydoggs]

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.

[Fivefingerdeathpunch]

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.

[SaukRapids]

"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]

I really want to help but im super confused to what is going on here

[SaukRapids]

So far, "no noticeable difference", aka what FFDP said. Thanks anyway.

[buck531]

Unplug the BBV. You'll be stuck at 4 lbs forever.

[SaukRapids]

I really want to help but im super confused to what is going on here

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.

[Scottydoggs]

buy snow tires.

[SaukRapids]

Thanks Scotty and buck. I did say "any input." Lol

[CrazyGuy03]

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

[SaukRapids]

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.

[WarStryker13]

Get Blizzaks and throw them on some cheap rims. switch them out when the snow melts.

[CrazyGuy03]

I cringe every time I hear blizzaks are the cure to winter traction like chicken soup cures the damn flu lmao. Marketing propaganda trickery !!

[Fivefingerdeathpunch]

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.

[CrazyGuy03]

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

[WarStryker13]

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.

[SaukRapids]

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.

[WarStryker13]

Many. And you won't notice the noise once the snow sticks.

Sent from my Radar 4G using Tapatalk

[SgtMarshal]

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.