[19Nasty1le]

Just curious here, just had my car finished and I have a Jokerz Race Port with 2.5 / 9.65 pulley combo 2” Kooks etc and it only made 15psi. Is this normal? Most the similar builds I see online are running 17-18psi but I guess some did use a 2.3/9.17 combo etc.

Car baselined 560/528 with a Roto-Fab and Corsa Extreme+ Catback.
Ended up at 880/831 on meth & E55

Full Build:

Jokerz Ported LT4 Blower
DSX Custom Billet Lid
2” Catless Kooks Headers
TSP Cam 229/245 .635/.635 117LSA +32
BTR .660” dual valve springs
Johnson 2110r lifters
Pushrods
Roto-Fab Big Gulp
Katech 103mm TB
160 Thermostat
ATI crank pulley
Cordes Expansion Tank
MM Catch can
DOD / VVT delete kit
ARP head stud kit
DSX 9.65” Lower Pulley 20% OD
DSX Aux fuel pump kit
P3 Gauge
Meth kit
DSX Flex Fuel
Plugs / Wires
Gates HD Green Belt
Katech Oil Pump
LME Chain Guide
C5R Timing Chain
CHE Trunnion Kit

[ZLRob]

Boost is a measurement of restriction, so just because you are seeing less is not a bad thing at all. Thinking immediately from the hip here I'm going to make an educated guess that your cam/ header combo is what is helping bring down your boost numbers. With saying that, I made semi close to the same numbers with a similar setup running less pulley. I used to make 13.5-13.6 psi at full gun with a 12% lower pulley and now with a Jokerz full tilt ported blower and an LT1 cam with a larger high side lobe I am now running 14-7- 15 psi without making any changes to the pulley setup.

I'd say based on the numbers that you are running pretty darn good. I also wouldn't run the blower anything further than about 16 psi as well, because at that point you are running outside of the efficiency map.

[Keithj3]

X-port would’ve made a few more lbs boost. When I had Jokerz port I made 16.5 lbs on 2.3 upper 9.60 lower. With X-port same pulleys I made 19lbs. X-port just makes more boost.

[SOCAL.M6.ZLE]

Originally Posted by ZLRob

Boost is a measurement of restriction, so just because you are seeing less is not a bad thing at all. Thinking immediately from the hip here I'm going to make an educated guess that your can/ header combo is what is helping bring down your boost numbers. With saying that, I made semi close to the same numbers with a similar setup running less pulley. I used to make 13.5-13.6 psi at full gun with a 12% lower pulley and now with a Jokerz full tilt ported blower and an LT1 cam with a larger high side lobe I am now running 14-7- 15 psi without making any changes to the pulley setup.

If say based on the numbers that you are running pretty darn good. I also wouldn't run the blower anything further than about 16 psi as well, because at that point you are running outside of the efficiency map.

Good points ROB.

I will also add, just keep in mind, your 9.45" lower + stock sized upper is an apron. 18% overdrive.... whereas a 2.3" upper + 9.17" lower is an approx. 24% overdrive... which is could be worth approximately. 1 - 1.5psi on your build.

Your power numbers seem inline with the mods listed to me. Sounds like a healthy build!

[JSH]

Originally Posted by 19Nasty1le

Just curious here, just had my car finished and I have a Jokerz Race Port with 2.5 / 9.65 pulley combo 2” Kooks etc and it only made 15psi. Is this normal? Most the similar builds I see online are running 17-18psi but I guess some did use a 2.3/9.17 combo etc.

Car baselined 560/528 with a Roto-Fab and Corsa Extreme+ Catback.
Ended up at 880/831 on meth & E55

Full Build:

Jokerz Ported LT4 Blower
DSX Custom Billet Lid
2” Catless Kooks Headers
TSP Cam 229/245 .635/.635 117LSA +32
BTR .660” dual valve springs
Johnson 2110r lifters
Pushrods
Roto-Fab Big Gulp
Katech 103mm TB
160 Thermostat
ATI crank pulley
Cordes Expansion Tank
MM Catch can
DOD / VVT delete kit
ARP head stud kit
DSX 9.65” Lower Pulley 20% OD
DSX Aux fuel pump kit
P3 Gauge
Meth kit
DSX Flex Fuel
Plugs / Wires
Gates HD Green Belt
Katech Oil Pump
LME Chain Guide
C5R Timing Chain
CHE Trunnion Kit

What are the sizes of your pulleys?

[19Nasty1le]

Originally Posted by SOCAL.M6.ZLE

Good points ROB.

I will also add, just keep in mind, your 9.45" lower + stock sized upper is an apron. 18% overdrive.... whereas a 2.3" upper + 9.17" lower is an approx. 24% overdrive... which is could be worth approximately. 1 - 1.5psi on your build.

Your power numbers seem inline with the mods listed to me. Sounds like a healthy build!

My lower is a 9.65 should be a 20% overdrive I think right? I was told to avoid the smaller upper for belt slip purposes.

[19Nasty1le]

Originally Posted by JSH

What are the sizes of your pulleys?

Stock size 2.5” upper and 9.65” lower

[ZLRob]

Originally Posted by Keithj3

X-port would’ve made a few more lbs boost. When I had Jokerz port I made 16.5 lbs on 2.3 upper 9.60 lower. With X-port same pulleys I made 19lbs. X-port just makes more boost.

The X- port is meant for the folks running huge HP builds of 1000+ HP. The Jokerz ported blowers are designed to work with builds up to around 900 HP and it's not recommended to take it much higher than that according to Brett himself. The difference between the two blower port jobs are very different on the power curves and it's notable on dyno graphs as well. One excels in working for the street and the other excels in making big power up high in the RPM range. Two different methodologies for two very different uses.

There is a huge misconception about boost and I wish there was more education put out regarding it. Folks chasing higher boost numbers will be ultimately disappointed when they are not making the power that is supposed to come with it because PD blowers have a narrower window of efficiency than a turbo or a centrifugal blower does. If you are spinning these blowers too hard, they heat soak due to not being within their efficiency window and you wind up actually losing power instead of making more of it. The X factor here comes into play if you are using meth injection. Then everything I just said goes out the window, but that presents a whole different set of potential challenges, complications, and even dangers.

That, plus the faster you spin the blowers the more you tax the drive bearings which realistically only have a maximum rating of 20,000 RPM, so meth injected or not, you'd just have to sit there and replace them very quickly because of that. A lot of us including myself are over that but I also want to stay relatively close to the max still. If I remember right, I'm spinning mine in the high 22K or the low 23K RPM. For others, well, you know, godspeed on that.. Lol.

Originally Posted by 19Nasty1le

My lower is a 9.65 should be a 20% overdrive I think right? I was told to avoid the smaller upper for belt slip purposes.

That was solid advice regarding the upper. If you want more boost but want to lessen the chance of slippage it's better to run a larger lower but there is also a limit on how large we can go with the OE setup too.

[RobZL1]

Two Robs don't always make a right, but in this case I'm with Rob. I think if you're rolling 880 on a ported stock blower case, you're killing it.

[Joshinator99]

Originally Posted by ZLRob

There is a huge misconception about boost and I wish there was more education put out regarding it. Folks chasing higher boost numbers will be ultimately disappointed when they are not making the power that is supposed to come with it because PD blowers have a narrower window of efficiency than a turbo or a centrifugal blower does. If you are spinning these blowers too hard, they heat soak due to not being within their efficiency window and you wind up actually losing power instead of making more of it. The X factor here comes into play if you are using meth injection. Then everything I just said goes out the window, but that presents a whole different set of potential challenges, complications, and even dangers.

That, plus the faster you spin the blowers the more you tax the drive bearings which realistically only have a maximum rating of 20,000 RPM, so meth injected or not, you'd just have to sit there and replace them very quickly because of that. A lot of us including myself are over that but I also want to stay relatively close to the max still. If I remember right, I'm spinning mine in the high 22K or the low 23K RPM. For others, well, you know, godspeed on that.. Lol.

Very well said.

Boost is not your friend. Build your motor to move air efficiently and you’ll make more power with much lower boost numbers.

[19Nasty1le]

Here’s the dyno sheet, doesn’t show boost but was told it’s 15psi. I’m happy with the results, I was aiming for around 900whp. He’s a great tuner!
Stock Baseline
Pump
Pump / Meth
E55 / Meth

[Keithj3]

Originally Posted by ZLRob

The X- port is meant for the folks running huge HP builds of 1000+ HP. The Jokerz ported blowers are designed to work with builds up to around 900 HP and it's not recommended to take it much higher than that according to Brett himself. The difference between the two blower port jobs are very different on the power curves and it's notable on dyno graphs as well. One excels in working for the street and the other excels in making big power up high in the RPM range. Two different methodologies for two very different uses.

There is a huge misconception about boost and I wish there was more education put out regarding it. Folks chasing higher boost numbers will be ultimately disappointed when they are not making the power that is supposed to come with it because PD blowers have a narrower window of efficiency than a turbo or a centrifugal blower does. If you are spinning these blowers too hard, they heat soak due to not being within their efficiency window and you wind up actually losing power instead of making more of it. The X factor here comes into play if you are using meth injection. Then everything I just said goes out the window, but that presents a whole different set of potential challenges, complications, and even dangers.

That, plus the faster you spin the blowers the more you tax the drive bearings which realistically only have a maximum rating of 20,000 RPM, so meth injected or not, you'd just have to sit there and replace them very quickly because of that. A lot of us including myself are over that but I also want to stay relatively close to the max still. If I remember right, I'm spinning mine in the high 22K or the low 23K RPM. For others, well, you know, godspeed on that.. Lol.



That was solid advice regarding the upper. If you want more boost but want to lessen the chance of slippage it's better to run a larger lower but there is also a limit on how large we can go with the OE setup too.

I agree and I understand boost. I was stating an apples to apples comparison. Reason I went the X-port after the jokerz port is because I needed new bearings. The shop I use does deal with jokerz anymore so I went with the X-port. The car went from 858rwhp to 936rwhp, and now 60-130 4.86 in June Kansas City heat. X-port made the car faster. Same tuner same dyno.

[ZLRob]

Originally Posted by Keithj3

I agree and I understand boost. I was stating an apples to apples comparison. Reason I went the X-port after the jokerz port is because I needed new bearings. The shop I use does deal with jokerz anymore so I went with the X-port. The car went from 858rwhp to 936rwhp, and now 60-130 4.86 in June Kansas City heat. X-port made the car faster. Same tuner same dyno.

Gotcha. Sorry about going off on the tangent. You just never know who actually knows this stuff and who doesn't.

[Keithj3]

Originally Posted by ZLRob

Gotcha. Sorry about going off on the tangent. You just never know who actually knows this stuff and who doesn't.

All good brother we all here for the love of the car’s. Like I said I definitely agree with you though. Have a good night brother 🫡