26GT got boost - not ESS/Whipple/Procharger *Roush 2650 Phase2 810hp*

[ZXMustang]

@ZXMustang : Where do you plan to run? I'm guessing Bradenton, because I am unsure what Sebring has 1/4 wise, and Homestead has a 1/8 death trap. PBIR has been closed for a bit now.

Bradenton for sure. Thats my home track.

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[Nila]

My custom tune. Shes a ripper. No regrets now that I can tune them. What a killer setup this is now for an otherwise stock car.

About to order a 2026 GT and deciding between Roush TVS, Whipple, and ProCharger. Sound matters to me — did pulling the airbox lids make the whine audible in the cabin with the windows up, or is it still mostly an outside-the-car thing?

 

[needforspeedirl]

About to order a 2026 GT and deciding between Roush TVS, Whipple, and ProCharger. Sound matters to me — did pulling the airbox lids make the whine audible in the cabin with the windows up, or is it still mostly an outside-the-car thing?

There isn’t much whine. I can’t hear any on my Roush setup other than a little at partial throttle below 20 mph. The exhaust also drowns out any audible whine inside or outside the vehicle. They do make a whine kit that you can install to pipe some intake noise into the cabin but it’s not going to improve the sound outside of the vehicle.

 

[Nila]

There isn’t much whine. I can’t hear any on my Roush setup other than a little at partial throttle below 20 mph. The exhaust also drowns out any audible whine inside or outside the vehicle. They do make a whine kit that you can install to pipe some intake noise into the cabin but it’s not going to improve the sound outside of the vehicle.

Yeah, I looked into that setup but most people have reported hearing more hiss than whine not to mention penetrating the firewall. I was looking to produce the same result but it seems the combination of improved modern superchargers and the sound dampening from ford makes it impossible to replicate. The OP said he was told to run an open air box to improve whine so I wanted to know if they ever made that change and if they did what was the difference.

 

[ZXMustang]

Oh no it whines LOUD with the lids off. I must have forgotten to post the whine video.

here you go. No whine mod needed.

 

[Puddinpop]

Yeah, I looked into that setup but most people have reported hearing more hiss than whine not to mention penetrating the firewall. I was looking to produce the same result but it seems the combination of improved modern superchargers and the sound dampening from ford makes it impossible to replicate. The OP said he was told to run an open air box to improve whine so I wanted to know if they ever made that change and if they did what was the difference.

Yeah I too have a launch edition and there is no whine audible inside with or without air box lids on. OP seems to be an outlier for whatever reason. I'm even on a smaller pulley and can't hear anything.

 

[ZXMustang]

Yeah I too have a launch edition and there is no whine audible inside with or without air box lids on. OP seems to be an outlier for whatever reason. I'm even on a smaller pulley and can't hear anything.

My kit is revised for the 2026. So there might be something different. But mine screams as you can hear in the video.

 

[Nila]

Oh no it whines LOUD with the lids off. I must have forgotten to post the whine video.

here you go. No whine mod needed.

Oh no it whines LOUD with the lids off. I must have forgotten to post the whine video.

here you go. No whine mod needed.

Oh wow that’s sick! You just removed the air box lid and that was it? I’d like to replicate.

 

[ZXMustang]

Oh wow that’s sick! You just removed the air box lid and that was it? I’d like to replicate.

That and a pair of K&N air filters for the stock inlets.

 

[Nila]

That and a pair of K&N air filters for the stock inlets.

Wow man your car sound beautiful and this was really helpful. Thanks a lot!

 

[Puddinpop]

My kit is revised for the 2026. So there might be something different. But mine screams as you can hear in the video.

Possibly but not too worried about it. This kit and possibly the car itself are on borrowed time. I'm getting an itch for a Grand Sport.

 

[ZXMustang]

Possibly but not too worried about it. This kit and possibly the car itself are on borrowed time. I'm getting an itch for a Grand Sport.

Im buying a C8 Z06 here shortly as well. Anyone want a 26 GT 10R80 with this roush kit...LOL

 

[ZXMustang]

Also, the car is perfectly dialed now. Runs like a swiss watch at WOT, every shift perfect. And drives better than any mustang on the road I would be willing to bet. Its so dialed, it makes me sad that others are running around on those junk roush tunes thinking they should have gotten a whipple.

I really need to get this on a dyno, but I can only imagine how smooth that graph would look and what it could make on a correctly calibrated dynojet. It just freight trains through the gears with no feel like it wants to let up. The logs are perfect. Fueling, spark and airloads are all exactly what im asking of it. And there is probably still 10% headroom on the table for spark and fueling. Once I got the fuel pump booster dialed in right, its like its not even there. Perfect idle pressure. Feed forward is basically stock until the high side where I rescaled it up to take advantage of the real extra voltage. So its not even doing anything different than stock until you are at full WOT and fuel flow is 8lbs/min ++. Had to lower the voltage floor though so it would idle at the correct pressure like stock. But all that good now.

This kit has really surprised me. I bought it as a goof to just do something different than the whipple/ESS crowd and to build tunes for it in case anyone wants one, and man Im glad I did. I knew the 2650 was a menace to the streets, but with tuning available, its become a real contender to the top spot - in my opinion. Granted out of the box, its not. The whipple cals even being very similar in most respects, are still better. But all thats changed now.

This gives me PP GT vs Darkhorse vibes in the Roush Phase 2 vs Whipple stage 2 debate.

Once all things are equalized with tuning, then neither one is better. I need to find some whipple folks local to tampa to get some runs in with.

One thing to note, I make very similar changes to whipple cals for both stage 1/2 cars. And since that cal starts from a more advanced place, it seems to arrive at the same destination in terms of performance as the roush car does with less tuning work, if that makes sense. Thats comparing logs from the many whipple cars ive done vs this one. So its pretty impressive to see this 2.65L blower keeping up with a 3.0L blower at least on paper. We will see how this plays out on the streets and with a dragy if I can find mine.

 

[needforspeedirl]

Also, the car is perfectly dialed now. Runs like a swiss watch at WOT, every shift perfect. And drives better than any mustang on the road I would be willing to bet. Its so dialed, it makes me sad that others are running around on those junk roush tunes thinking they should have gotten a whipple.

I really need to get this on a dyno, but I can only imagine how smooth that graph would look and what it could make on a correctly calibrated dynojet. It just freight trains through the gears with no feel like it wants to let up. The logs are perfect. Fueling, spark and airloads are all exactly what im asking of it. And there is probably still 10% headroom on the table for spark and fueling. Once I got the fuel pump booster dialed in right, its like its not even there. Perfect idle pressure. Feed forward is basically stock until the high side where I rescaled it up to take advantage of the real extra voltage. So its not even doing anything different than stock until you are at full WOT and fuel flow is 8lbs/min ++. Had to lower the voltage floor though so it would idle at the correct pressure like stock. But all that good now.

This kit has really surprised me. I bought it as a goof to just do something different than the whipple/ESS crowd and to build tunes for it in case anyone wants one, and man Im glad I did. I knew the 2650 was a menace to the streets, but with tuning available, its become a real contender to the top spot - in my opinion. Granted out of the box, its not. The whipple cals even being very similar in most respects, are still better. But all thats changed now.

This gives me PP GT vs Darkhorse vibes in the Roush Phase 2 vs Whipple stage 2 debate.

Once all things are equalized with tuning, then neither one is better. I need to find some whipple folks local to tampa to get some runs in with.

One thing to note, I make very similar changes to whipple cals for both stage 1/2 cars. And since that cal starts from a more advanced place, it seems to arrive at the same destination in terms of performance as the roush car does with less tuning work, if that makes sense. Thats comparing logs from the many whipple cars ive done vs this one. So its pretty impressive to see this 2.65L blower keeping up with a 3.0L blower at least on paper. We will see how this plays out on the streets and with a dragy if I can find mine.

Are you still running the Roush cooling parts from the kit? I am and I run into cooling issues due to IAT temps post blower being in the 170*F range at the drag strip and on long street pulls. I am going to upgrade the Roush front intercooler to a triple pass unit and maybe install an interchiller if that doesn’t do the trick. If I start at 40 mph on the highway in 75-85 weather by the time I hit 140 mph it starts pulling timing and it shuts the intakes around 170 mph.

 

[ZXMustang]

Are you still running the Roush cooling parts from the kit? I am and I run into cooling issues due to IAT temps post blower being in the 170*F range at the drag strip and on long street pulls. I am going to upgrade the Roush front intercooler to a triple pass unit and maybe install an interchiller if that doesn’t do the trick. If I start at 40 mph on the highway in 75-85 weather by the time I hit 140 mph it starts pulling timing and it shuts the intakes around 170 mph.

Yeah man out of box kit. No hardware changes. You are missing all the cooling changes I make in the tune. You got several things that change cooling for the better. My IATs are like 5* over ambient for my total pulls on the street. So much needs to be updated not just power and trans.

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