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3Likes
11-20-2016, 08:35 AM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,444
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Not Ranked
Which Supercharger?
For a Coyote + stock 6 speed auto trans?
My original plan was a Roush kit. But, I'v had an unusual amount of free time lately, and starting to re-think that. I'm considering a Pro-Charger. Lots of things I like about the centrifugal over the roots type.
My question is, will it fit? Has anyone installed a Pro-Charger? Which brackets did you use?
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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11-20-2016, 01:33 PM
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CC Member
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Join Date: Dec 2010
Location: Tempe,AZ-High Point,NC,
AZ
Cobra Make, Engine: Kirkham #684, 482FE, Mike Mccluskey build
Posts: 2,520
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Not Ranked
I don't think they look as cool, but they are efficient. I prefer a Kenny bell charger. They make the most power and have many different sizes.
__________________
PRIDEnJOY
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11-20-2016, 03:35 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,444
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Not Ranked
Rumor has it that the centrifugal chargers are more efficient, and run cooler. The roots type appear to be easier to fit in a small compartment. But water-to-air intercoolers are also less efficient.
But, I also like the look. And I want something visually different.
I also like the look and fit of the Paxton - and the history is good. But they don't have a program for the automatic transmission.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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11-20-2016, 04:21 PM
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CC Member
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Join Date: Jan 2009
Location: Las Vegas,
NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
Posts: 5,570
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Not Ranked
Whipple too. You can get a Coyote compatible Whipple from Ford Performance Parts including the tune, although it's probably oriented towards the Mustang it'd be a starting place for your local tuner.
__________________
Cheers,
Tony
CSX4005LA
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11-20-2016, 04:29 PM
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CC Member
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Join Date: Dec 2010
Location: Tempe,AZ-High Point,NC,
AZ
Cobra Make, Engine: Kirkham #684, 482FE, Mike Mccluskey build
Posts: 2,520
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Not Ranked
Heat soak can be a problem but you have to run them really hard for that to happen.
__________________
PRIDEnJOY
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11-21-2016, 03:14 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
A roots style blower is considered a positive displacement blower. It is not 100% efficient because there is clearances between the rotors. There are some designs where they put Teflon on the rotor tips to seal better.
A centrifugal blower is not positive displacement. At a zero delta pressure they move a ton of air, but as the delta pressure builds the air flow will drop all the way to zero. The pressure that the blower can build is proportional to the tips speed of the fins. Therefore the faster you spin it the more pressure it can push. On the other hand, the slower you spin it, the less pressure it can push.
On an engine, a roots style blower is moving a certain volume of air per revolution. The engine displaces a certain amount or air per revolution. If the blower is moving about twice the amount of air that the engine is ingesting, the pressure will be about 2 atmospheres, which is about 14.7 psig. So at any rpm, the engine will get roughly the same amount of boost.
On a centrifugal blower, at low rpm the blower cannot make much boost at all. If memory serves it is a square function curve. So, let's say you can make 14.7 psig at 8000 rpm. At 1/2 that (4000 rpm) you can only make 1/4 the pressure (3.7 psig).
Full out both blowers will perform the same. Down low, a centrifugal is like having no blower at all.
A roots style still has slippage (losses) and that does make heat. At pressures less than 10 psig it is not worth considering. However the twin screw compressors out there are much more efficient. They take less power to turn and make less heat. If the price was similar, I would go twin screw compressor every time and twice on Sundays.
PS
A positive displacement blower will give you a nice flat torque curve.
A centrifugal will give a torque curve that looks like the right half of a "U". If your cam and heads quit breathing fairly quick, the two will combine to give a curve looking like "/ " (only a little flater).
Last edited by olddog; 11-21-2016 at 03:32 PM..
Reason: PS
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11-21-2016, 07:25 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,444
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Not Ranked
Quote:
Originally Posted by olddog
PS
A positive displacement blower will give you a nice flat torque curve.
A centrifugal will give a torque curve that looks like the right half of a "U". If your cam and heads quit breathing fairly quick, the two will combine to give a curve looking like "/ " (only a little flater).
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Yes, I see what you mean. I like a nice flat torque curve. Very easy to drive, and very predictable.
Roush it is! Thanx. That was my original plan. But you know how it is when you get too much free time.
The other thing I noticed is how fast the centrifugal spins. About 5 times engine speed, or so.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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11-21-2016, 07:28 PM
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CC Member
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Join Date: Jul 2007
Location: Near Daytona Beach,
FL
Cobra Make, Engine:
Posts: 32
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Not Ranked
There seems like there'd be room for turbos. I bet Hellion could put together a potent system. They can package twin turbos in Mustangs. They should be able to package them in a Cobra. That would be my power adder.
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Looking at Backdraft
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11-22-2016, 06:33 AM
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CC Member
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Join Date: Dec 2010
Location: Tempe,AZ-High Point,NC,
AZ
Cobra Make, Engine: Kirkham #684, 482FE, Mike Mccluskey build
Posts: 2,520
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Not Ranked
Quote:
Originally Posted by Jus Cruisin
There seems like there'd be room for turbos. I bet Hellion could put together a potent system. They can package twin turbos in Mustangs. They should be able to package them in a Cobra. That would be my power adder.
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Either one in these cars turbo or supercharged is crazy fast. With a coyote and small turbos it can make 700hp easy.
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PRIDEnJOY
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11-22-2016, 10:58 AM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,119
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Not Ranked
Quote:
Originally Posted by bobcowan
Yes, I see what you mean. I like a nice flat torque curve. Very easy to drive, and very predictable.
Roush it is! Thanx. That was my original plan. But you know how it is when you get too much free time.
The other thing I noticed is how fast the centrifugal spins. About 5 times engine speed, or so.
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Whipple is a better unit and has a nicer inlet location for fitting in the Backdraft especially when you are trying to fit it with a big automatic attached. We were hoping they would release a DBW center feed at some point but have not heard anything.
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11-24-2016, 09:24 AM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
Isn't the Whipple a twin screw compressor technology?
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11-24-2016, 01:18 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,444
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Not Ranked
The Roush kit looks very good. And (more importantly) have an excellent reputation for tuning.
I looked at the new Edelbrock kit. And there's a lot about it that I like. But, the power levels were significantly lower than Roush, and their tuning for automatics might not be as good.
Then I looked at Brenspeed. With their tuning and mods, power levels are about the same (600+), and they have a good tune for the automatic. It's also shorter than other kits, and will fit under the stock Mustang strut tower brace, when others will not. At the moment, my current pick is the Brenspeed Edelbrock kit. I also like the way it looks.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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11-25-2016, 05:55 PM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,719
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Not Ranked
Quote:
Originally Posted by olddog
Isn't the Whipple a twin screw compressor technology?
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Yes and they are impressive.
Ed
__________________
Help them do what they would have done if they had known what they could do.
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12-04-2016, 07:52 PM
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CC Member
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Join Date: Sep 2016
Cobra Make, Engine: Backdraft, 5.0 Coyote
Posts: 37
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Not Ranked
Bob,
Whichever blower you decide to go with, please don't settle for a canned tune from the manufacturer. Take your car to Elite Performance in Denver and have them tune it for you. One of the mechanics there is a Backdraft dealer and knows Cobras inside and out. The tuner has done several Cobras including a blown/nitrous Coyote Backdraft car.
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12-04-2016, 08:33 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,444
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Not Ranked
You're exactly right. The canned tune is a good starting point. But if you want the best drivability and performance, it needs a little dyno time for that last 5-10%. I'll take it over to Lou's Cars and let them do the final bits for me.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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01-16-2017, 12:41 PM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,908
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Not Ranked
Worth watching - Weiand Roots-type vs. Paxton centrifugal. Both used carburetors, and that created some issues with the Paxton blow-through. [ame]https://www.youtube.com/watch?v=EHg2uqJvLOk[/ame]
Summary:
Roots: More torque and HP at lower RPM, lower overall torque and HP
Centrifugal: Lower torque and HP at lower RPM, higher lower overall torque and much higher peak HP
Worth noting: belt slippage issues with both setups, though they seemed a bit of a bigger problem with the Roots-type blower.
Either way I'd go EFI, and FiTech has power-adder and blow-through configurations that would be worth looking at.
__________________
Brian
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01-16-2017, 05:17 PM
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CC Member
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Join Date: Aug 2016
Cobra Make, Engine: Factory five
Posts: 26
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Not Ranked
Quote:
Originally Posted by bobcowan
For a Coyote + stock 6 speed auto trans?
My original plan was a Roush kit. But, I'v had an unusual amount of free time lately, and starting to re-think that. I'm considering a Pro-Charger. Lots of things I like about the centrifugal over the roots type.
My question is, will it fit? Has anyone installed a Pro-Charger? Which brackets did you use?
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Can make anything fit with little work, I now have the kennebell 4.2 LC on car.ive seen the coyote motor with KB on it. Car ran very well.
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01-17-2017, 08:47 AM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,444
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Not Ranked
Quote:
Originally Posted by x96535
Bob,
Whichever blower you decide to go with, please don't settle for a canned tune from the manufacturer. Take your car to Elite Performance in Denver and have them tune it for you. One of the mechanics there is a Backdraft dealer and knows Cobras inside and out. The tuner has done several Cobras including a blown/nitrous Coyote Backdraft car.
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That's Lou's Cars, in Littleton. Lou Rivera "retired" some years ago, and only works on fun cars. Last time I was there, he was busier than ever! Come on, Lou, time to retire.
Elite Performance is a tuning company with one employee, and I can't think of his name right now. Lou tunes the carburated cars, and Elite does the EFI stuff. He's pretty darned good, too.
Quote:
Originally Posted by Trickcobra1
Can make anything fit with little work, I now have the kennebell 4.2 LC on car.ive seen the coyote motor with KB on it. Car ran very well.
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In the end, I went with Edelbrock from Brenspeed. Mostly because they have an excellent tune for an automatic car. But also because the inlet is in the front of the blower, and not the rear. The rear inlet may be more efficient, and make a little more power. But this one fits better. I'm not looking for ultimate power. If I was, I would have used a stroker small block Windsor.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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01-18-2017, 06:51 AM
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CC Member
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Join Date: Feb 2003
Location: Jonesboro GA,
Posts: 382
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Not Ranked
IMO: Any technical discussion on which system is better is kind of silly when considering the car it will be going on. Your not picking a work truck or wife. Which one makes you giggle more? There is your answer.
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01-18-2017, 08:31 AM
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CC Member
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Join Date: Sep 2001
Cobra Make, Engine:
Posts: 678
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Neutral
Quote:
Originally Posted by bobcowan
That's Lou's Cars, in Littleton. Lou Rivera "retired" some years ago, and only works on fun cars. Last time I was there, he was busier than ever! Come on, Lou, time to retire.
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I have retired twice. I work more now than when I worked as a job. I think it's in your blood
__________________
Dan
427 CSX 3000/4000 and Shelbys.
All gone ! Was a Hell of a run
Now ... The dogs car
Mercedes E63S station wagon. 603hp
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