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Old 12-21-2018, 10:53 PM   #29
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I know were interested in a real dyno sheet for the RS but in the meantime here is a buddies Dynapak Dyno sheet from Church Automotive in California for his stock compression motor with the RS and e85. He made 400 on it at about 7200rpm

https://ibb.co/GWf7pC1
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Old 12-21-2018, 11:01 PM   #30
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I also talked to Delicious Tuning and they said that the small standard Jackson intercooler was mostly designed around the C30 and lower boost setups and that the c38 RS setups are showing some very noticeable heatsoak which is holding back the full potential. The guys at ATPTurbo think that based on the 74lb/min flow of the C38-81 at high boost it should be upgraded to the garrett core of 24 x 10.5 x 3 (600hp rated) or the 24 x 6 x 3 (400hp core) for best cooling and best efficiency for keeping pressure drop low as possible. Once I finish tuning here soon Ill see how the results look and go from there on more upgrades to the kit.
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Old 12-27-2018, 12:40 PM   #31
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I know were interested in a real dyno sheet for the RS but in the meantime here is a buddies Dynapak Dyno sheet from Church Automotive in California for his stock compression motor with the RS and e85. He made 400 on it at about 7200rpm

https://ibb.co/GWf7pC1
That Dyno is also on a AT car, so considerable difference because of the drive train loss.

High Boost Pulley+E85 does about that same power on that same Dyno with a MT car.
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Old 01-01-2019, 10:55 PM   #32
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That Dyno is also on a AT car, so considerable difference because of the drive train loss.

High Boost Pulley+E85 does about that same power on that same Dyno with a MT car.
Thats true I forgot about that.
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Old 02-06-2019, 06:40 AM   #33
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So the car is finished up. On a mustang dyno that I baselined stock at 153whp, I made 350whp on E85 at 15psi at 7450rpm with the RS Upgrade. This is in Texas in about 50 degree weather when tuned. Car made around 295whp on 93. Lots of timing pulled out obviously. Lots of people say this dyno reads low but with the 153whp baseline Id say its a pretty accurate reading. My motor is built but with stock CFM so no ported heads or cams. I dont think the RS will make 400 on anything but a Dynapak dyno. The car feels fantastic and the power is very impressive for a rotrex so the actual number is irrelevant to me at the end of the day. The extra torque coming on sooner is noticeable over the HBP. I understand all setups and environments are different but IDK where Jackson is seeing 17psi. Also Im not so sure a better intercooler would be worth it. Based on the temps we saw when tuning, theres a little to be desired in terms of cooling but I dont think the power gain would be worth the money spent. May be better to just use the C38-91 as it would just bolt right in and run more power that way. Either way, these were the results I saw with my 12.5:1 motor, E85, catless bolt ons, and the 90mm RS pulley.
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Old 02-09-2019, 08:02 PM   #34
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So the car is finished up. On a mustang dyno that I baselined stock at 153whp, I made 350whp on E85 at 15psi at 7450rpm with the RS Upgrade. This is in Texas in about 50 degree weather when tuned. Car made around 295whp on 93. Lots of timing pulled out obviously. Lots of people say this dyno reads low but with the 153whp baseline Id say its a pretty accurate reading. My motor is built but with stock CFM so no ported heads or cams. I dont think the RS will make 400 on anything but a Dynapak dyno. The car feels fantastic and the power is very impressive for a rotrex so the actual number is irrelevant to me at the end of the day. The extra torque coming on sooner is noticeable over the HBP. I understand all setups and environments are different but IDK where Jackson is seeing 17psi. Also Im not so sure a better intercooler would be worth it. Based on the temps we saw when tuning, theres a little to be desired in terms of cooling but I dont think the power gain would be worth the money spent. May be better to just use the C38-91 as it would just bolt right in and run more power that way. Either way, these were the results I saw with my 12.5:1 motor, E85, catless bolt ons, and the 90mm RS pulley.
Are you above sea level at all? I was seeing just under 14psi with the HBP at redline on a C38-81. It's hard to believe you only gain 1 lb of boost with the RS pulley. Regardless of numbers your car sounds fun! Hopefully you have a convenient place to get E85, it's quite addictive...
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Old 02-11-2019, 06:39 AM   #35
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Are you above sea level at all? I was seeing just under 14psi with the HBP at redline on a C38-81. It's hard to believe you only gain 1 lb of boost with the RS pulley. Regardless of numbers your car sounds fun! Hopefully you have a convenient place to get E85, it's quite addictive...
I am in Dallas, Texas which is 430 feet above sea level. All of the HBP users in this area including myself saw no more than 12psi max at 7450 redline. So a 3psi gain with RS. And yeah the butt dyno definitely feels great! The numbers are heartbreakers but it definitely feels how it should.
Do you remember your stock baseline numbers and then the numbers with the ~14psi HBP setup?
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Old 02-11-2019, 01:01 PM   #36
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I am in Dallas, Texas which is 430 feet above sea level. All of the HBP users in this area including myself saw no more than 12psi max at 7450 redline. So a 3psi gain with RS. And yeah the butt dyno definitely feels great! The numbers are heartbreakers but it definitely feels how it should.
Do you remember your stock baseline numbers and then the numbers with the ~14psi HBP setup?
Unfortunately I don't have a stock baseline on the same dyno. 350 WHP on a mustang dyno is A LOT of power. I'm sure it feels amazing and the car doesn't feel like it's lacking, even in the torque department.

I don't want to upset the Rotrex guys (I use to be one) but the reality is the C38-81 will not make 400-500 WHP on a non hub dyno like many people on this forum claim it will. Maybe with a different cam and higher than stock compression?

The Rotrex feels great, makes cool sounds and mimics the stock power band in a very satisfying way. BUT if you are looking for BIG power it is not a good option even with the RS pulley on E85.

Rotrex touts itself as being the most "efficient" blower can someone please explain this to me? To me that would mean having the most power gains per PSI of boost. Obviously it will not keep up with a turbo and I don't think anyone expects it to. But I promise you that a TVS 1320 with 15 PSI on E85 will make a noticeable amount more power without any dip in power at the top end and plenty of torque down low.

The consensus on this forum that the Rotrex is best for track and the TVS is best for the street just doesn't make sense to me. To me the TVS is clearly the better choice for AutoX and I believe it will out perform the Rotrex on track as well. If you want a car that sounds cool, feels like you're boosted and keeps the stock powerband then go Rotrex. If you want torque and to feel like you have a strong V6 in the car with near silent operation go TVS. The Rotrex is the least likely to blow a stock motor but that's simply because it makes less power as you move away from the CARB setup compared to Edelbrock and Harrop.

Last edited by GrabTheWheel; 02-11-2019 at 01:27 PM.
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Old 02-11-2019, 07:14 PM   #37
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Unfortunately I don't have a stock baseline on the same dyno. 350 WHP on a mustang dyno is A LOT of power. I'm sure it feels amazing and the car doesn't feel like it's lacking, even in the torque department.

I don't want to upset the Rotrex guys (I use to be one) but the reality is the C38-81 will not make 400-500 WHP on a non hub dyno like many people on this forum claim it will. Maybe with a different cam and higher than stock compression?

The Rotrex feels great, makes cool sounds and mimics the stock power band in a very satisfying way. BUT if you are looking for BIG power it is not a good option even with the RS pulley on E85.

Rotrex touts itself as being the most "efficient" blower can someone please explain this to me? To me that would mean having the most power gains per PSI of boost. Obviously it will not keep up with a turbo and I don't think anyone expects it to. But I promise you that a TVS 1320 with 15 PSI on E85 will make a noticeable amount more power without any dip in power at the top end and plenty of torque down low.

The consensus on this forum that the Rotrex is best for track and the TVS is best for the street just doesn't make sense to me. To me the TVS is clearly the better choice for AutoX and I believe it will out perform the Rotrex on track as well. If you want a car that sounds cool, feels like you're boosted and keeps the stock powerband then go Rotrex. If you want torque and to feel like you have a strong V6 in the car with near silent operation go TVS. The Rotrex is the least likely to blow a stock motor but that's simply because it makes less power as you move away from the CARB setup compared to Edelbrock and Harrop.
I completely agree. Unlikely any chassis dyno is gonna show +400 with a C38-81 RS setup. I definitely chose the C38 kit because I originally ran it on stock motor 93 fuel and it was my daily at the time so i wanted the low torque for extra precaution. Even though its perfectly possible to hurt the valvetrain with a rotrex but atleast I wasnt going to bend a rod by any means (not with a good tune anyway). I will look into a turbo kit maybe in a year or two to push the built motor a little harder. But in the meantime the RS setup feels fantastic and should be very reliable with the motor build/power levels. In the back of my mind though Im curious how a C38-91 or even the C38R would feel with a small pulley. Just isnt worth spending the +2300$ that those superchargers cost when a 4500$ JDL 3076r kit can make 500hp.
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Old 02-11-2019, 07:21 PM   #38
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Also, if I remember correctly (Id have to go back and look at dyno sheet) the RS made 10.5psi at 5000rpm.
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Old 02-11-2019, 11:03 PM   #39
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I completely agree. Unlikely any chassis dyno is gonna show +400 with a C38-81 RS setup. I definitely chose the C38 kit because I originally ran it on stock motor 93 fuel and it was my daily at the time so i wanted the low torque for extra precaution. Even though its perfectly possible to hurt the valvetrain with a rotrex but atleast I wasnt going to bend a rod by any means (not with a good tune anyway). I will look into a turbo kit maybe in a year or two to push the built motor a little harder. But in the meantime the RS setup feels fantastic and should be very reliable with the motor build/power levels. In the back of my mind though Im curious how a C38-91 or even the C38R would feel with a small pulley. Just isnt worth spending the +2300$ that those superchargers cost when a 4500$ JDL 3076r kit can make 500hp.
Well, it's nice to see someone who can be objective instead of just a fanboy of the kit they bought! I actually bought a Jackson kit first after having driven the Edelbrock kit. I thought the Jackson felt faster because of the way the power builds up top and it suited me since I liked to keep the revs up above 4K anyway. Plus at the time I felt like if I was gonna spend the money on boost I wanted to hear and feel it, so the Rotrex just fit the bill as I wasn't going to Sprintex and the TVS units are super quiet.

It's pretty hysterical to me that Rotrex advertise their blowers as "silent operation". They are super loud off throttle maybe not more so than any other centrifugal supercharger but I haven't noticed much of a difference. I hadn't heard about the C38R, looks pretty cool. On the plus side if you decide to sell and upgrade, the Jackson kits are easy to sell, they are also half the weight of the TVS kits. Not only a benefit on your car but also makes it easier when you go to ship it.

I have kind of a love/hate relationship with centri's. I think if you could have a Rotrex large enough to make 1 bar of boost at 3500rpm and 30 psi at redline it would be perfect!

I have an old comptech kit on my S2K and I enjoy it. My wife hates the sound. She likes the sound of V8's...
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Old 02-12-2019, 07:15 AM   #40
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Well, it's nice to see someone who can be objective instead of just a fanboy of the kit they bought! I actually bought a Jackson kit first after having driven the Edelbrock kit. I thought the Jackson felt faster because of the way the power builds up top and it suited me since I liked to keep the revs up above 4K anyway. Plus at the time I felt like if I was gonna spend the money on boost I wanted to hear and feel it, so the Rotrex just fit the bill as I wasn't going to Sprintex and the TVS units are super quiet.

It's pretty hysterical to me that Rotrex advertise their blowers as "silent operation". They are super loud off throttle maybe not more so than any other centrifugal supercharger but I haven't noticed much of a difference. I hadn't heard about the C38R, looks pretty cool. On the plus side if you decide to sell and upgrade, the Jackson kits are easy to sell, they are also half the weight of the TVS kits. Not only a benefit on your car but also makes it easier when you go to ship it.

I have kind of a love/hate relationship with centri's. I think if you could have a Rotrex large enough to make 1 bar of boost at 3500rpm and 30 psi at redline it would be perfect!

I have an old comptech kit on my S2K and I enjoy it. My wife hates the sound. She likes the sound of V8's...
Speaking of Rotrex sound haha...aside from that noise they make at idle...the RS makes it LOUD AS HELL 6000rpm and higher. When i wind out 2nd and 3rd to red, the induction noise is absurdly loud. Much much louder than the standard and HBP.
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Old 01-09-2020, 03:22 AM   #41
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Good morning to all. Just found this thread and it seems to be what I am looking for. I have a question and hope someone on here can help my out. I'm running a JRSC kit with a C38 SC and a RS pulley. Built engine with 10.0:1 compression and stock heads and cams (upgraded valve springs) and running on 98 pump gas.

My question is at 7500rpm I get only 0.81 bar of boost (11.7Psi). But I do not understand how that is possible. Where does the rest of the 5+ Psi go?

What changes can I make to up the boost and power levels? (No, changing fuel is not possible since I can't get e85 here)

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Old 01-09-2020, 01:27 PM   #42
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Good morning to all. Just found this thread and it seems to be what I am looking for. I have a question and hope someone on here can help my out. I'm running a JRSC kit with a C38 SC and a RS pulley. Built engine with 10.0:1 compression and stock heads and cams (upgraded valve springs) and running on 98 pump gas.

My question is at 7500rpm I get only 0.81 bar of boost (11.7Psi). But I do not understand how that is possible. Where does the rest of the 5+ Psi go?

What changes can I make to up the boost and power levels? (No, changing fuel is not possible since I can't get e85 here)

Thanks
Is your boost linear or leveling off? Check for mechanical boost leaks.
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