Need help deciding on an induction system GT40

History, I currently own my third Superformance Cobra, 496 FE engine.

So, I am looking to buy a new build (buying a roller then having the engine/manual trans installed) a Superformance GT40 that looks like this:





I am going to use a 5.0 Coyote (some variant) for the power plant. To get the look of the car the way I want it, I would prefer a stack system induction.

The problem is I had an 8-Stack system on my current Cobra and after months of ownership (17 to be precise) I pulled it off and installed a carburetor in its place.

Said 8-stack system now resides on a table in my office:



Why did I take it off? The system was not tunable “in total”. It did some things really well. (idle, start, WOT) but always had drivability issues.

Now comes the Borla system. Roush has a package for the Borla with the Coyote engine, but I would prefer a different engine builder other that Roush.



Roush uses this ECU and can use the VCT programming which makes me think that the drivability uses may be solved, except still no MAF.
Infinity Series 7 | AEM

What do the pro-tuners on here think? Go with the Borla stack and it will be okay, or just go with the supercharger?



Anyone have any experience?


E

I know Roush has had good luck with that 8 stack, they have used it quite a bit on the cobras with coyote engines but only in the 500-550hp range. What power level do you want? If you want 625-800hp then definitely go with the blower and it will have no drivability issues



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You have the HP numbers right.

The supercharger would be great for the added power, but already having 600+ in my Cobra (upper 10 sec car) I am not planning on making the decision based on power. I really want to get the look right, but I have been here before. I have asked a lot of people and no one has given me the confidence that they have tuned the stack system on a coyote and it is fine.

The picture you posted (thank you) is the Hillbank drfit car I found out. I am going to see if they still have it set up with the stack system and if so I am going to drive it to see how it drives.

Anyone else have any experience?

E

Yes that was their fun car at sema a couple years ago. Had the aluminator xs I believe, young guy driving it and he loved the stack setup. Have you considered the other borla setup?
I know the picture is Windsor based but works well once tuned and looks amazing


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geoffmt said:

Yes that was their fun car at sema a couple years ago. Had the aluminator xs I believe, young guy driving it and he loved the stack setup. Have you considered the other borla setup?
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No, since I am going for the weber look the originals had, and there is a pan that closes with the rear clam that needs to place over the stacks.



Since finding out that Hillbank still owns the drift car, I am going to go drive it and see how the Borla system performs.

E

Awesome! Please let us know what you think after the drive!


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geoffmt said:

Awesome! Please let us know what you think after the drive!


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I will.

Looks like May early June I will travel to Cali.

E

Went to Cali last week and made some changes to my build based on information obtained.

1. I will be building a 351W based motor, not a Coyote.
The 351 based motor and heads is easier to fit, and headers are a standard manufactured item.
2. The Borla injection system that is based on the old TWM system has a big advantage over my old system, where the injectors are below the throttle plates, not above. I found wide success with the tuning on the Borla injection, so that is what I will be using.

I found that I fit easily in the car (I am 6' and 250lbs), getting in and out is different than the Cobra, but really no less hard or easy.

There are several systems (AirRide, KW) that are used to raise and lower the front end to get over curbs...(the more you know eh?)

So I am moving a little more forward, thinking 575 at the flywheel on a 427 displacement 351.

E

So with a lack of correct "bundle of snakes" headers, I am going Borla injection on a 351W based 427 motor. Should make 575 hp.

I suppose I will make a build thread at some point.

E

It’s a beautiful setup!


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Since you're already spending GT 40 money, go with the Kaase Boss 9 600 cu in option and make over 900HP on pump gas.

9397SVTs said:

View attachment 1579024 Since you're already spending GT 40 money, go with the Kaase Boss 9 600 cu in option and make over 900HP on pump gas.

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Ha! That would be a monster! Either the RBT or the Quaife transaxles are limited to 500hp. There is also the issue with the distance between the bulkhead and the centerline of the axles. The FE engine will make it, a 385 series block is just "a little" too long.

But I love your style!

E

PS I was looking at building a replica Boss 429 also. If I get crazy I might still build a new body 69 Boss 429

Great Asp said:

Ha! That would be a monster! Either the RBT or the Quaife transaxles are limited to 500hp. There is also the issue with the distance between the bulkhead and the centerline of the axles. The FE engine will make it, a 385 series block is just "a little" too long.

But I love your style!

E

PS I was looking at building a replica Boss 429 also. If I get crazy I might still build a new body 69 Boss 429

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The Kasse boss 9 would go perfect in a 69 boss build. Isn’t classic restoration doing a ford licensed remake?


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geoffmt said:

The Kasse boss 9 would go perfect in a 69 boss build. Isn’t classic restoration doing a ford licensed remake?


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Yes, they are and I thought one other company (I think CR is the more widely known). $200K for a Boss 429 that they build (plus or minus). I love them, love the IRS, but at the end of the day when people say "Is it real?", you have to say "no".

Having a replica Cobra for over 17 years (I've owned three) I've had to answer that question a bunch. But I might come back to a Boss 429 at some point.

E

Great Asp said:

Ha! That would be a monster! Either the RBT or the Quaife transaxles are limited to 500hp. There is also the issue with the distance between the bulkhead and the centerline of the axles. The FE engine will make it, a 385 series block is just "a little" too long.

But I love your style!

E

PS I was looking at building a replica Boss 429 also. If I get crazy I might still build a new body 69 Boss 429

Click to expand...

Thanks. Too bad it won't fit the application.

A '69 Boss would be really cool.

Great Asp said:

Yes, they are and I thought one other company (I think CR is the more widely known). $200K for a Boss 429 that they build (plus or minus). I love them, love the IRS, but at the end of the day when people say "Is it real?", you have to say "no".

Having a replica Cobra for over 17 years (I've owned three) I've had to answer that question a bunch. But I might come back to a Boss 429 at some point.

E

Click to expand...

Being licensed by ford, real yes... but reproduction real. Shelby sold some real recreation 65 cobras in the past few years. There’s a new market being presented. Original and new original.


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geoffmt said:

Being licensed by ford, real yes... but reproduction real. Shelby sold some real recreation 65 cobras in the past few years. There’s a new market being presented. Original and new original.


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Yeah, there is "Real" "Original" "Continuation" "Replica" "kit car" and a few more describing words that I probably forgot used for Cobras. I see people getting sold Cobras all the time and they are told "it's a real Cobra", when it's a replica. Then there are the guys that buy a Continuation car and at the first car show they are at the say "It's an Original".

My GT40 will correctly be a "Licensed Continuation GT40"