18 GT A10 Procharger 4.25in pulley

[Brandon91]

Hopefully someone can help. I just received my Lethal Stage 2 kit today and the P1x came with a 4.25in pulley, is this going to make too much boost for 93 at 7500rpms.

I will be running 1050x injectors and a BAP for now.

Thanks in advance

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[SolarFlare]

Maybe yes. Id work my way to that pulley not start with it.

 

[schmeky]

Brandon91,

You need to talk to your tuner. But with a 4.25", a BAP will probably be mandatory along with injectors.

I have a Stage II P1X with a 4.75" pulley, stock fuel pump (no BAP), ID1050X, and run 93 pump. No fueling issues and makes great power. I run a Thermal R&D axle back which is essentially a straight 3" pipe, and 8 ounces Boostane every fill up. I'm guessing 625 whp.

I'm happy and have no plans to pulley down.

 

[Brandon91]

How much boost are you seeing with the 4.75 pulley.

When I ordered the kit some guy from lethal called and asked my power goals, fuel type and a few other things. I told him 650whp and 93. He said that shouldn’t be a problem and then the Procharger showed up with a 4.25 pulley smh.

Everything I find seems that this pulley will be way over 10psi.

Brandon91,

You need to talk to your tuner. But with a 4.25", a BAP will probably be mandatory along with injectors.

I have a Stage II P1X with a 4.75" pulley, stock fuel pump (no BAP), ID1050X, and run 93 pump. No fueling issues and makes great power. I run a Thermal R&D axle back which is essentially a straight 3" pipe, and 8 ounces Boostane every fill up. I'm guessing 625 whp.

I'm happy and have no plans to pulley down.

 

[Gregory347]

I run a 4.5 and make 680 rear wheel... car has run 10.20 at 138.8. Lund doesn’t recommend any more pulley than that on my car with pump gas. Next time to track I may drop to a 4.38 and dump 5 gallons of ms 109 in the tank. Also my kit shipped with the 4.5 pulley

 

[Brandon91]

I run a 4.5 and make 680 rear wheel... car has run 10.20 at 138.8. Lund doesn’t recommend any more pulley than that on my car with pump gas. Next time to track I may drop to a 4.38 and dump 5 gallons of ms 109 in the tank. Also my kit shipped with the 4.5 pulley

 

[Brandon91]

Is your car a 18+?

Do you have a part number for the belt you use?

 

[Gregory347]

2019..... I’ll have to check on the belt size

 

[SolarFlare]

So FYI, for those in this similar situation which I’ve seen a few in the last couple months. Don’t feel like you HAVE to start with the pulley supplied, it’s ok with go the safer route, start with 1 or preferably 2 sizes larger, do your tuning and once it’s good you move down at your leisure, whenever you feel like you need more. You don’t have to completely retune. I originally street tuned my p1sc with a 4.75. And I moved down to a 4.38 only really needing a small revision for the addition of the shelby manifold. Then continued down to 4.25 street tuning on E85 then nothing else and I went down to a 4.00. I put the P1X with a 4.25 with that same tune and only needed a tweak for fueling from one street pull and now I’m down to 4.0 without changes. These cars target lambda, it isn’t all thrown out the window because you changed 1 pulley size.

 

[Brandon91]

2019..... I’ll have to check on the belt size

Awesome, thanks.

They sent me a K080655. I found a K080660 I think I may order that with a 4.50 pulley.

If don’t mind me asking how much boost does the 4.50 make at redline assuming you rev to 7500

 

[Gregory347]

9-10 lbs of boost with the 4.5...

 

[Cory S]

So FYI, for those in this similar situation which I’ve seen a few in the last couple months. Don’t feel like you HAVE to start with the pulley supplied, it’s ok with go the safer route, start with 1 or preferably 2 sizes larger, do your tuning and once it’s good you move down at your leisure, whenever you feel like you need more. You don’t have to completely retune. I originally street tuned my p1sc with a 4.75. And I moved down to a 4.38 only really needing a small revision for the addition of the shelby manifold. Then continued down to 4.25 street tuning on E85 then nothing else and I went down to a 4.00. I put the P1X with a 4.25 with that same tune and only needed a tweak for fueling from one street pull and now I’m down to 4.0 without changes. These cars target lambda, it isn’t all thrown out the window because you changed 1 pulley size.

Don’t let tuners see you giving out the truth. People will start to realize that 80% of the time, tune revisions aren’t even needed........Thanks to closed loop fueling and incoming air volume monitoring.

 

[schmeky]

I think you were supplied with the wrong pulley on an initial set up. 4.5 is pushing it and 4.25 puts you into a different fueling category.

I will tell you based on first hand experience , if you don't "rubber up", i.e. budget in much wider and stickier tires, you'll get gapped by cars with much less HP.

With my P1X, I had no traction at anything under 50 mph with my Indy 500's in 255/40/19. Literally wheel spin city. Forget any find of dig, you'll be humiliated by lower HP cars if you don't have the traction to utilized the new power.

Welcome to the rabbit hole.

 

[Brandon91]

I think you were supplied with the wrong pulley on an initial set up. 4.5 is pushing it and 4.25 puts you into a different fueling category.

I will tell you based on first hand experience , if you don't "rubber up", i.e. budget in much wider and stickier tires, you'll get gapped by cars with much less HP.

With my P1X, I had no traction at anything under 50 mph with my Indy 500's in 255/40/19. Literally wheel spin city. Forget any find of dig, you'll be humiliated by lower HP cars if you don't have the traction to utilized the new power.

Welcome to the rabbit hole.

I’ll be running r888r’s 305’s in the rear and I will be getting a drag pack soon. I just bought the car 2 months ago. I’ll also be doing 8 ounces of boostane.

I also bought a bunch of stuff like Sway bars, k member brace, IRS support and half shafts. I’ll be ordering Fortune auto 510 coilovers in 2 weeks. Hopefully I don’t have a problem putting the power down. Lol

I had a 17 Camaro SS 1LE with a Hellion kit making 600whp and it hooked pretty good in second with Good year super car 3’s. 3rd gear pulls were the best in that car.

I appreciate the advice.

 

[schmeky]

Sounds like you are on the right track. You don't need any advice from me, which is good a thing!

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