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#1107 | |
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Corner Junkie
Join Date: Feb 2012
Drives: 13 BRZ, 11 STI, 99 RS
Location: Ohio
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#1108 |
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Banned
Join Date: Jun 2013
Drives: They have four wheels
Location: United States
Posts: 482
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A positive displacement supercharger should be much easier to calculate than any turbo rig. The prior posts make good points but I think some of you might be over thinking it in this case. I'd say around 260hp on E85 is more than logical.
The FA20 already makes 100hp/liter, that means it flows quite well. In a perfect world, w/ a PD charger you can simply take a percentage of 1bar (14.7 psi) that the stock motor operates at under NA and calculate the multiplier as a percentage of 1bar that you are adding. Assuming lack of intake restriction (Remember, the Innovate system comes w/ it's own tuned manifold). So let's say 7.5 psi is roughly 1/2bar, this translates to adding half your NA value, thus 200hp (crank) + 100hp= 300hp total (crank). However, if the Sprintex graph is right, then it operates at 90% volumetric efficiency, so more like roughly 100 x .90= 90hp (ignoring intake charge temps for the sake of simplicity). Thus total 290hp (crank). So now let's minus roughly 10% for parasitic losses = 260hp (crank). Minus another 15% for drivetrain losses and you are at 210-220hp (wheels). So take that 210-220 and add E85 to the equation and add maybe another 10% back, you get 230-240hp. So where's the 20hp discrepancy w/ robispec's numbers? Ah, we didn't calculate his increase in volumetric efficiency on both sides of the air pump due to improved intake and exhaust, better tuning/mapping, changed pulley/boost, reductions in frictional and rotational mass losses, all of which convert to more power. Thus finding another 20hp doesn't seem unlikely, nor would calling the dyno potentially generous be unreasonable. Either way, the numbers all look roughly in the logical ballpark to me. This is why I consider the rated HP rating of a blower and it's max BAR to be something of a red-herring. If I know it's volumetric efficiency, and the engine's VE, the math is relatively straight forward. To me, this does not look like unicorn numbers at all. If this were a turbo, the math is more complicated due to variable VE and intake charge temps. If the efficiency of the motor was lower, then yes I would see unicorns too. Imagine how well a PD charger would do on an S2000 at 120hp/liter. Common S2000 numbers seem to indicate an rough average of 330hp at the wheels under similar conditions. Again, this makes sense if you increase the FA20's efficiency by 20%. Could this Innovate PD charger get you there? That would be more of a concern for the S2000. These numbers aren't 100% accurate at all, but are relatively straight forward and in the ballpark of reality. So nobody should be worried about making only 180hp or hope for 600hp at the wheels w/ this kit. Last edited by Anaxilus; 06-20-2013 at 06:41 PM. |
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#1109 |
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Senior Member
Join Date: Jan 2012
Drives: A lot of supercars.
Location: USA
Posts: 495
Thanks: 237
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Mentioned: 5 Post(s)
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Boom.
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#1110 | |
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Senior Member
Join Date: Nov 2011
Drives: Subaru BRZ Limited 6MT
Location: Winston-Salem, NC
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I don't understand the volume efficiency map. How would running say 10 or 12 psi plug into that calculation? (Assuming you can match the A/F) I guess the better question might be at what boost level is the blower maxed out at? (in theory)
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Innovate Supercharged Black Limited BRZ 6-Speed MT(Build Thread)
2010 Cadillac CTS-V Sedan M6 w/550whp (Build Thread) ![]() |
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#1111 |
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OEDC
Join Date: Oct 2012
Drives: Vortech 8.5psi 274WHP 2013 BRZ
Location: Pa
Posts: 619
Thanks: 117
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245 was with an ok tune, and before that a different blower, 263/265 8.5 psi with stock fuel system being the thing that's stopping it going further, that's on 92 WAWA gas.
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My BRZ FI Build
Visconti is like a Tick that sucks as much blood(money) as he can before you figure out he's there. please make sure to leave your experiences with visconti on his feedback thread located here: Visconti feedback Last edited by Adeets; 06-20-2013 at 07:24 PM. |
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#1112 |
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Senior Member
Join Date: Jul 2012
Drives: 2013 Black FR-S
Location: SF
Posts: 3,030
Thanks: 881
Thanked 2,014 Times in 990 Posts
Mentioned: 153 Post(s)
Tagged: 1 Thread(s)
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#1113 | |
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Senior Member
Join Date: Jul 2012
Drives: 2013 Black FR-S
Location: SF
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Am I surprised? No. I would expect the same with my innovate kit if I had a 9 psi pulley on 91 octane. This is why I am running water/meth and filling up with 2-3 gals of 100 octane at the track to keep everything working nice and smooth/cool and to create insurance. |
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| The Following User Says Thank You to sw20kosh For This Useful Post: | Subzero (06-20-2013) |
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#1114 | |
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Join Date: Jul 2012
Drives: S2000 CR
Location: Orange County
Posts: 14,562
Thanks: 8,942
Thanked 14,211 Times in 6,854 Posts
Mentioned: 970 Post(s)
Tagged: 14 Thread(s)
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| The Following 2 Users Say Thank You to CSG Mike For This Useful Post: | sw20kosh (06-20-2013), whataboutbob (06-21-2013) |
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#1115 | |
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Join Date: Jul 2012
Drives: S2000 CR
Location: Orange County
Posts: 14,562
Thanks: 8,942
Thanked 14,211 Times in 6,854 Posts
Mentioned: 970 Post(s)
Tagged: 14 Thread(s)
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| The Following User Says Thank You to CSG Mike For This Useful Post: | sw20kosh (06-20-2013) |
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#1116 |
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Senior Member
Join Date: Jan 2013
Drives: WRB BRZ
Location: Houston
Posts: 539
Thanks: 101
Thanked 233 Times in 112 Posts
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was MIA for like 3 weeks from the forum come back to find kit still not released! LOL im going turbo. screw this.
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#1117 | |
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OEDC
Join Date: Oct 2012
Drives: Vortech 8.5psi 274WHP 2013 BRZ
Location: Pa
Posts: 619
Thanks: 117
Thanked 263 Times in 159 Posts
Mentioned: 15 Post(s)
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Oh and I don't need to know second hand about something some guys car did, this is my car.
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My BRZ FI Build
Visconti is like a Tick that sucks as much blood(money) as he can before you figure out he's there. please make sure to leave your experiences with visconti on his feedback thread located here: Visconti feedback |
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#1118 | |
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Senior Member
Join Date: Jul 2012
Drives: 2013 Black FR-S
Location: SF
Posts: 3,030
Thanks: 881
Thanked 2,014 Times in 990 Posts
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No offense.
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#1119 |
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Senior Member
Join Date: Jun 2012
Drives: Scion FR-S
Location: Davison, MI
Posts: 2,315
Thanks: 400
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I'll have the kit in Michigan with 93 octane. Some gas stations there sell 91 and 93 octane. do you think it would be a noticeable difference between the two. E85 is plentiful in Michigan so I plan on running that eventually but I will probably leave it on pump gas for a bit just wondering if I should put 93 in it or go with the kit recommended 91.
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#1120 |
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Banned
Join Date: Jan 2012
Drives: Attitude
Location: MD
Posts: 10,046
Thanks: 884
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93....
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