[Sillysspeed]

Dont forget the benefits of porting the blower over changing a pulley. Ported blower you are gaining power and not creating more heat.

[Z OH 6]

Originally Posted by Sillysspeed

Dont forget the benefits of porting the blower over changing a pulley. Ported blower you are gaining power and not creating more heat.

Not necessarily, porting a blower typically increases boost too.

[Sillysspeed]

Originally Posted by Z OH 6

Not necessarily, porting a blower typically increases boost too.

You’re not mechanically spinning the blower harder though like with a different pulley ratio

[Z OH 6]

Originally Posted by Sillysspeed

You’re not mechanically spinning the blower harder though with a different pulley ratio

Increasing boost is going to increase heat too though due to compression. You are increasing efficiency by porting which just means you're getting a boost increase in a different way but there's no getting around increasing boost is going to generate more heat although I admit a 2psi increase from a ported blower may not generate as much heat as a 2psi increase from spinning the blower faster.

[KingLT1]

I have tuned several Xport cars. With X port and stock pullies they see little to no increase in air temps. The X port essentially makes the stock supercharger much larger volume wise. It's the much better way to go with the 1.7 vs pulleying down a stock blower. It's damn near maxed efficiency wise right out of the gate, hence why the X porting gains so much boost and power. I often see 3psi gains without touching any pullies. The increased boost doesn't mean higher air temps if it's achieved through efficiency and not tuning the blower harder. Now cylinder temps will increase because more air and fuel is being burned in the cylinder to make more power.

[Patriot Motorsports USA]

Originally Posted by KingLT1

I have tuned several Xport cars. With X port and stock pullies they see little to no increase in air temps. The X port essentially makes the stock supercharger much larger volume wise. It's the much better way to go with the 1.7 vs pulleying down a stock blower. It's damn near maxed efficiency wise right out of the gate, hence why the X porting gains so much boost and power. I often see 3psi gains without touching any pullies. The increased boost doesn't mean higher air temps if it's achieved through efficiency and not tuning the blower harder. Now cylinder temps will increase because more air and fuel is being burned in the cylinder to make more power.

I have been thinking about going with the X-Port as my understanding was more flow, not necessarily adding more boost, but that does make sense at the same air temps. Without spinning the supercharger any harder, and maybe with the more flow spinning it even slower to gain better cooling... would you see this as a benefit for someone like myself interested in only long duration pulls for power on the road course?

THANKS!!

[Z OH 6]

Originally Posted by ZLElvira

I have been thinking about going with the X-Port as my understanding was more flow, not necessarily adding more boost, but that does make sense at the same air temps. Without spinning the supercharger any harder, and maybe with the more flow spinning it even slower to gain better cooling... would you see this as a benefit for someone like myself interested in only long duration pulls for power on the road course?

THANKS!!

Porting the blower will add more boost which will require more fuel. Something to think about too.

[PowerDemon]

Originally Posted by KingLT1

I have tuned several Xport cars. With X port and stock pullies they see little to no increase in air temps. The X port essentially makes the stock supercharger much larger volume wise. It's the much better way to go with the 1.7 vs pulleying down a stock blower. It's damn near maxed efficiency wise right out of the gate, hence why the X porting gains so much boost and power. I often see 3psi gains without touching any pullies. The increased boost doesn't mean higher air temps if it's achieved through efficiency and not tuning the blower harder. Now cylinder temps will increase because more air and fuel is being burned in the cylinder to make more power.

If you were going to leave the pulleys stock but wanted to port the blower would you go std port or X port?

[Sillysspeed]

X-Port ftw!!!

[KingLT1]

Originally Posted by PowerDemon

If you were going to leave the pulleys stock but wanted to port the blower would you go std port or X port?

X-port

[Patriot Motorsports USA]

Originally Posted by Z OH 6

Porting the blower will add more boost which will require more fuel. Something to think about too.

I will see how much room I have "E%" tomorrow after a re-tune with the Big Gulp intake versus the standard RotoFab which was installed for my previous result.

How much boost is added typically by doing the X-port? My concern with the X-Port is most people add a bigger throttle body, which in my experience changes the "hit" and ability to feather the throttle... a huge part of trying to finesse a 3500# car around a corner at speeds exceeding 120mph while doing all you can not to upset the balance with the throttle.

So, I think if I were to go the X-port route for the lower MATs, has anyone run such with a stock-sized throttle body?

[cajunzl1]

i think CSP Andrew did in the first episode when he ported the supercharger. Later episode he added a larger TB and Rotofab. however that was before the X port was available...

so those results were with the std port.

[Z OH 6]

Originally Posted by ZLElvira

I will see how much room I have "E%" tomorrow after a re-tune with the Big Gulp intake versus the standard RotoFab which was installed for my previous result.

How much boost is added typically by doing the X-port? My concern with the X-Port is most people add a bigger throttle body, which in my experience changes the "hit" and ability to feather the throttle... a huge part of trying to finesse a 3500# car around a corner at speeds exceeding 120mph while doing all you can not to upset the balance with the throttle.

So, I think if I were to go the X-port route for the lower MATs, has anyone run such with a stock-sized throttle body?

You're going to choke the ported blower with a stock TB and defeat most of the purpose of having it ported.

[KingLT1]

Originally Posted by ZLElvira

I will see how much room I have "E%" tomorrow after a re-tune with the Big Gulp intake versus the standard RotoFab which was installed for my previous result.

How much boost is added typically by doing the X-port? My concern with the X-Port is most people add a bigger throttle body, which in my experience changes the "hit" and ability to feather the throttle... a huge part of trying to finesse a 3500# car around a corner at speeds exceeding 120mph while doing all you can not to upset the balance with the throttle.

So, I think if I were to go the X-port route for the lower MATs, has anyone run such with a stock-sized throttle body?

You won't gain much if you choke it with a stock throttle body. PD superchargers draw air through the airbox and throttle body similar to NA. They are the most sensitive form of induction to proper CAI and TB sizing. So you need a Big Gulp CAI and 103tb to maximize the gains from the X port.

3-3.5psi gain in boost with a BG cai and 103tb.