Questions about Kooks install.

[GP70]

Is there a noticable feel in power with longtubes? In my case I am more concerned with power than sound for the amount of money and labour involved can't justify if it's not noticeable.

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[Cordero1]

Is there a noticable feel in power with longtubes? In my case I am more concerned with power than sound for the amount of money and labour involved can't justify if it's not noticeable.

I sure hope so, I'm not doing it just for the sound. The sound is like a bonus. But with negative 0* temperatures outside, it will be a bit before I get to find out. By then the CEL will come on & I'll have to get a tune so it will be hard to tell. But just by looking at them compared to the stock exhaust manifold I assume there has to be a power increase just by the amount of flow being let out. Wish I had a dyno shop near by & I could answer this better for you.

 

[WCRookie99]

I sure hope so, I'm not doing it just for the sound. The sound is like a bonus. But with negative 0* temperatures outside, it will be a bit before I get to find out. By then the CEL will come on & I'll have to get a tune so it will be hard to tell. But just by looking at them compared to the stock exhaust manifold I assume there has to be a power increase just by the amount of flow being let out. Wish I had a dyno shop near by & I could answer this better for you.

There's a few Threads on hp, I'm trying to get a cross section of improvements and hp gain. All hp listed are rewhip obviously. If I had to guess Kooks adds approx 35hp (maybe little more) plus 40lbs or so lighter. You can tell.

https://www.mustang6g.com/forums/threads/up-dated-mach-1-dyno-sheets-no-forced-induction.183072/

 

[Cordero1]

There's a few Threads on hp, I'm trying to get a cross section of improvements and hp gain. All hp listed are rewhip obviously. If I had to guess Kooks adds approx 35hp (maybe little more) plus 40lbs or so lighter. You can tell.

https://www.mustang6g.com/forums/threads/up-dated-mach-1-dyno-sheets-no-forced-induction.183072/

Yeah I'm looking forward to some decent weather next week so I can let her rip.

 

[WCRookie99]

Yeah I'm looking forward to some decent weather next week so I can let her rip.

Now focus on, putting your GT on a diet. Here's a trick Mod that moves the weight to the right place. Plus the Rotors -22lbs.

 

[Cordero1]

Now focus on, putting your GT on a diet. Here's a trick Mod that moves the weight to the right place. Plus the Rotors -22lbs.

What rotors you change to? I plan on dropping the drive shaft rotational weight next as well as what ever other weight savings I can find.

 

[WCRookie99]

What rotors you change to? I plan on dropping the drive shaft rotational weight next as well as what ever other weight savings I can find.

I went with these guys because they were the OEM on my Boss302R. (Different size of course)

https://girodisc.com/ford-s550-mustang-gt-brembo-front-rotors/

My next Mod is drive train as well. Drive shaft and light weight flywheel. Seats and a few more, geez never ending.

 

[Cordero1]

I went with these guys because they were the OEM on my Boss302R. (Different size of course)

https://girodisc.com/ford-s550-mustang-gt-brembo-front-rotors/

My next Mod is drive train as well. Drive shaft and light weight flywheel. Seats and a few more, geez never ending.

Nice! Thanks for the link.

 

[deanm11]

There's a few Threads on hp, I'm trying to get a cross section of improvements and hp gain. All hp listed are rewhip obviously. If I had to guess Kooks adds approx 35hp (maybe little more) plus 40lbs or so lighter. You can tell.

https://www.mustang6g.com/forums/threads/up-dated-mach-1-dyno-sheets-no-forced-induction.183072/

I would say 35hp is pretty far off the real #. I have 1 7/8 Kooks. I built up my 2020 GT A10 and now in progress on my 2022.

Baseline dyno (all dynojet SAE) with just Borla S-type cat back was 428hp/395tq
Final build w/ E85 and max timing/cam tuning, Kooks/cats, ported intake/TB, Steeda closed box air box lid without restrictor.

That's about 45hp from all that. I think E85/timing/tuning + both intakes are at least 25-30.
That would say long tubes with cats is more like 20hp. Maybe there's 5-10hp in catless on top.

I have all but ported intake back on my 2022 now. Dyno results were about 5hp light to my full build. I didn't have a baseline on that one. (also A10 car)

it's worth it to me, but they're not 35hp plus. I'd say 30hp max from stock if LT and no cats.

 

[mkcotton]

I would say 35hp is pretty of the real #. I have 1 7/8 Kooks. I built up my 2020 GT A10 and now in progress on my 2022.

Baseline dyno (all dynojet SAE) with just Borla S-type cat back was 428hp/395tq
Final build w/ E85 and max timing/cam tuning, Kooks/cats, ported intake/TB, Steeda closed box air box lid without restrictor.

That's about 45hp from all that. I think E85/timing/tuning + both intakes are at least 25-30.
That would say long tubes with cats is more like 20hp. Maybe there's 5-10hp in catless on top.

I have all but ported intake back on my 2022 now. Dyno results were about 5hp light to my full build. I didn't have a baseline on that one. (also A10 car)

it's worth it to me, but they're not 35hp plus. I'd say 30hp max from stock if LT and no cats.

Sometimes finding (aka not losing) HP is easier than making it. For instance, switching from a two piece heavy drive shaft to a lighter one piece drive shaft reduces power train loss. I have Kooks 1 7/8 LTHs, green cats, performance connect with a Borla Atak, with a JLT 120mm intake CAI and a badass tuner. I am making ~460 RWHP (average between 8 dyno runs); if you subscribe to an A10 eating 20% HP, that would be roughly ~575 fly wheel HP.

 

[deanm11]

Sometimes finding (aka not losing) HP is easier than making it. For instance, switching from a two piece heavy drive shaft to a lighter one piece drive shaft reduces power train loss. I have Kooks 1 7/8 LTHs, green cats, performance connect with a Borla Atak, with a JLT 120mm intake CAI and a badass tuner. I am making ~460 RWHP (average between 8 dyno runs); if you subscribe to an A10 eating 20% HP, that would be roughly ~575 fly wheel HP.

I forgot to mention my end result was with qa1 carbon driveshaft, lighter Baer rotors, lighter wheels. 20% is high. inferring from factory rating, the Hot Rod:car craft engine dyno tests, i've come up with 13% loss

 

[WCRookie99]

I forgot to mention my end result was with qa1 carbon driveshaft, lighter Baer rotors, lighter wheels. 20% is high. inferring from factory rating, the Hot Rod:car craft engine dyno tests, i've come up with 13% loss

Right I’m talking calculated hp at the flywheel vs the 480hp rating:

So I’m sitting at 465.9hp on the Dyno on a very hot 86deg day test. Kooks and 100octTune that’s it. Take your 13%loss that’s

535hp vs 480hp rating = 55hp gained

40hp from the Kooks
15hp from the tune
Colder day would add 20hp


Hahaha so whatever but for sure it will help!


https://www.mustang6g.com/forums/threads/up-dated-mach-1-dyno-sheets-no-forced-induction.183072/

 

[deanm11]

Right I’m talking calculated hp at the flywheel vs the 480hp rating:

So I’m sitting at 465.9hp on the Dyno on a very hot 86deg day test. Kooks and 100octTune that’s it. Take your 13%loss that’s

535hp vs 480hp rating = 55hp gained

40hp from the Kooks
15hp from the tune
Colder day would add 20hp


Hahaha so whatever but for sure it will help!


https://www.mustang6g.com/forums/threads/up-dated-mach-1-dyno-sheets-no-forced-induction.183072/

Cats or not cats ? Factory resonator still in place ?

 

[WCRookie99]

Cats or not cats ? Factory resonator still in place ?

Both gone...3" Kooks all the way

 

[deanm11]

Both gone...3" Kooks all the way

That seems about right but more like 40 flywheel * .87 = 35 rwhp for Headers + cat delete + cat back.

I' say Kooks/LTs w/ Cats, no other exhaust changes, about 20rwhp. /.87 = 23hp flywheel.

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