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Old 09-05-2014, 01:07 AM   #1
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Default Jackson Racing Rotrex race kit proto

This is a Jackson Racing Rotrex C30-74 supercharger set up, running at about 9.5psi (170kpa) on E85. Should bump a bit when we get full boost of around 14psi. Production blower and bracket but custom intercooler, piping and a programmable ECU (not CARB). Engine is a 1.9L BP6D race engine with our CNC ported head, Tomei cams, ceramic thermal coated chambers, valve heads, crown and exhaust port. RB header & exhaust, square top intake.

The dyno started acting up and stopped displaying power. Later runs we fixed the AFR's and probably made more midrange on low end torque. Still, 200+ lbs instantaneous torque from 4500-8000 is fun. This is in Deviate


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Old 09-05-2014, 06:58 AM   #2
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Not sure if you see anything, but it looks like your attachment failed.

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Old 09-05-2014, 07:08 AM   #3
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Stole this image from another forum you posted it on



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Old 09-05-2014, 11:17 AM   #4
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Emilio, how much of that power is coming from the SuperMiata motor? A good chunk of it?
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Old 09-05-2014, 11:32 AM   #5
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Originally Posted by concealer404 View Post
Emilio, how much of that power is coming from the SuperMiata motor? A good chunk of it?
About 180whp
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Old 09-05-2014, 11:40 AM   #6
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So on a normal BP, rough stupid ricer math says we could expect this setup to be more like 240whp?
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Old 09-05-2014, 12:18 PM   #7
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Quote:
Originally Posted by emilio700 View Post
This is a Jackson Racing Rotrex C30-74 supercharger set up, running at about 9.5psi (170kpa) on E85. Should bump a bit when we get full boost of around 14psi.


How are you going to bump up boost that much on a SC? Pulley changes or are you currently running a restrictor?


I'll bet that car moves.
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Old 09-05-2014, 01:22 PM   #8
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So on a normal BP, rough stupid ricer math says we could expect this setup to be more like 240whp?
As mentioned below, we are no making full boost yet. At the same 9.5psi, all other test variables the same but OEM NB2 engine, probably 250-260whp. That is a guess based some similar combinations we have run.

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How are you going to bump up boost that much on a SC? Pulley changes or are you currently running a restrictor?


I'll bet that car moves.
We have a fancy ECU controlled WG setup that isnt tuned right yet. We figured 300whp is enough for this weekend at MRLS. From 5500-8000 it pulls nearly as hard as my C6 Z06. Car weighs 2150 w/o driver. 7.4lbs/hp vs 7.8lbs/hp for the Miata.

This pulley/blower combo should make closer to 15psi on a stock engine and maybe 13psi on our betterbreathing whammy engine. That should be something like 290 and 330whp I think. There are two larger blowers for those that hate their rear tires.
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Old 09-05-2014, 02:42 PM   #9
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How about a stock BP and 91 octane instead of E85. Any estimates of power the kit could make?
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Old 09-05-2014, 02:56 PM   #10
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Quote:
Originally Posted by emilio700 View Post
As mentioned below, we are no making full boost yet. At the same 9.5psi, all other test variables the same but OEM NB2 engine, probably 250-260whp. That is a guess based some similar combinations we have run.


We have a fancy ECU controlled WG setup that isnt tuned right yet. We figured 300whp is enough for this weekend at MRLS. From 5500-8000 it pulls nearly as hard as my C6 Z06. Car weighs 2150 w/o driver. 7.4lbs/hp vs 7.8lbs/hp for the Miata.

This pulley/blower combo should make closer to 15psi on a stock engine and maybe 13psi on our betterbreathing whammy engine. That should be something like 290 and 330whp I think. There are two larger blowers for those that hate their rear tires.

wow. May I ask what size pulley(s) you are running?
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Old 09-05-2014, 02:57 PM   #11
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How about a stock BP and 91 octane instead of E85. Any estimates of power the kit could make?
E85 is worth about 5% N/A, more on F/I
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Old 09-05-2014, 04:14 PM   #12
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wow. May I ask what size pulley(s) you are running?
There is no magic in pulley sizes. You really need to look at all the relevant parameters on your build and call Jackson Racing. They will help you figure out what pulley you need for your particular Rotrex setup.

Crank pulley dia / blower pulley dia x Rotrex traction drive gear ratio for the model you are using x RPM = peak blower speed
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Old 09-05-2014, 07:19 PM   #13
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Quote:
Originally Posted by emilio700 View Post
There is no magic in pulley sizes. You really need to look at all the relevant parameters on your build and call Jackson Racing. They will help you figure out what pulley you need for your particular Rotrex setup.

Crank pulley dia / blower pulley dia x Rotrex traction drive gear ratio for the model you are using x RPM = peak blower speed
Gotcha. I was more curious how fast you were spinning the unit since you are revving a lot higher than most.
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Old 09-05-2014, 11:16 PM   #14
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Redline for the C30-74 is 120k, iirc from another thread this car is gearing the Rotrex to hit 120k at 8k engine rpm.
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Old 09-06-2014, 05:07 AM   #15
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I just want to go faster Mr Emilio, is this kit going to work for the average joe such as myself?
How much would one expect to pay for someone to install this kit?
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Old 09-06-2014, 11:35 AM   #16
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I just want to go faster Mr Emilio, is this kit going to work for the average joe such as myself?
How much would one expect to pay for someone to install this kit?
So it is clear, the hardware on this car is one off. Only the blower/pulley/bracket are production parts. Installation would depend on your mechanic. Oscar Jackson himself can install a kit in less than 2hrs but I'd expect the typical shop to charge 4-6 hrs labor.
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Old 09-08-2014, 01:31 AM   #17
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I don't know Oscar Jackson himself :(

I do have some leftover 'tools' from Ikea, so it should only take me 2 months.
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Old 09-08-2014, 03:13 AM   #18
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The Rotrex cars looked strong all weekend at MRLS.
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Old 09-08-2014, 09:44 AM   #19
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I had to make sure this wasn't a necropost from 2007.
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Old 09-08-2014, 05:17 PM   #20
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Quote:
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I had to make sure to troll all non-turbo F/I posts since 2007.
ftfy
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