Hi everyone, I am wondering a few things about my current set-up. First, I am running the stock base 5psi kit and am running an Automatic. I am at 370RWHP & 360FT/LBS. I commute 60 miles a day and would like to drive with this set-up for at least 3-4 more years. Also, one of the local shops said that he would put jba longtube headers with a jba catted x-pipe to reduce pressure on the motor.
How much more hp and torque I can add before I should be concerned about reliability for both Motor and Transmission?
Will these headers really reduce the pressure enough to where it will make the motor last longer?
You are only at 5 psi right now. I am assuming that you are running the conservative tune that comes with the kit. With that in mind, I would say you are very safe with your current setup. Longtubes will lower your boost by relieving some backpressure. At 5 psi, I would say by maybe a lb or so in the upper rpms. I know that a set of Kooks LTs will drop around 2 psi on a system that is over 9 lbs. They will also definately increase horsepower and torque. I would say at least a 20 rwhp gain in your application. I would surely consider adding them. Only drawback, you will have to get another tune when you add them. Sice your car is a daily driver, I would stay at you current boost level. Your tune is the most important thing concerning the longevity of you motor. I personally would not go more than 10psi on stock internals, especially on a daily driver. My car is not a daily driver (so far about 2500 miles per year) and I am only going with around 7.5 lbs of boost.
You're the first person I've seen on a forum with the E-Force. With that being said, How do you like it?
I gotta ask the same question. I've had one on layaway since early July, I'll probably have it installed by late November early December timeframe and my car is a DD too.
BTW, did you upgrade your fuel pump system at all? If not, what are your A/F readings looking like in the upper RPM (4K +) ranges?
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2008 Mustang GT/CS, 5M, Stock
(Edelbrock E-Force w/ FRPP GT500 Fuel Pumps on layaway - Only $1,137.08 left to pay).
"You can't create wealth by dividing it...
All you do is reduce everyone and everything to the lowest common denominator."
I have to ask for the amount of money a S/C cost why are you keeping the HP so low when is the pully change coming. The block can handle a lot more than 370RWHP
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2008 Mustang GT,125 NX Shot,3.73 gears,LFP aluminum Drivshaft,JLT INTAKE,BBK LT HEADERS AND H-PIPE,Ford Racing Rear Exaust,Steeda strut,93 Octane Street Tune from TillmanSpeed,93 Octane NOS Race Tune from Tillman Speed,B&M LCA, WOT Box, Comp Engineering 3 way adjustable rear shocks
Best ET 12.16 @ 117
upcoming MODS- C&L intake Manifold or FRPP Intake Manifold, STAGE 2 XFI™ SPR comp cams
What strain?? Headers really aren't going to help anything.
The stress on the engine from the S/C is what I'm talking about. Since the headers will take some of the boost away it would help out with the stress on the engine.
Hi everyone, I am wondering a few things about my current set-up. First, I am running the stock base 5psi kit and am running an Automatic. I am at 370RWHP & 360FT/LBS.
Find a new tuner
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Also, one of the local shops said that he would put jba longtube headers with a jba catted x-pipe to reduce pressure on the motor.
It's called Back Pressure
Whomever you talked to at that shop is trying to tell you what you want to hear so he can sell you some exhaust. By all means, you will see an improvement in HP and TQ but it will not add any provable (see below) life to your motor. And the HP/TQ gains are quite small when you look at them from a dollar per horsepower perspective. Exhaust is in the $150-200/HP range for a car with a blower. Economically that is a very bad ratio.
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How much more hp and torque I can add before I should be concerned about reliability for both Motor and Transmission?
About 80hp and 90ftlb
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Will these headers really reduce the pressure enough to where it will make the motor last longer?
Reducing backpressure technically will make life easier in the motor. But the claim of “last longer” is borderline lying. The length of time you warm your motor up in the morning will have a far greater effect on the life of the motor than the stock backpressure. In a scientific setting you would be hard pressed to prove that a reduction in backpressure will make the motor last longer. The rest of the car will be falling apart long before back pressure has any effect on your motor.
There is also not very much back pressure with the stock exhaust anyway. That’s why you don’t get big gains with headers, mid pipes and axle backs. Ford did a great job when they engineered the exhaust for the Mustang. It is not a 3rd Generation Camaro, that’s for sure (they have incredibly restrictive exhaust).
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Can I get away with the stock manifolds?
I am running 450HP right now through the stock manifolds and in the spring I will be running 650HP through them. I think its safe to say you will be fine with the stock manifolds.
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Whomever you talked to at that shop is trying to tell you what you want to hear so he can sell you some exhaust. By all means, you will see an improvement in HP and TQ but it will not add any provable (see below) life to your motor. And the HP/TQ gains are quite small when you look at them from a dollar per horsepower perspective. Exhaust is in the $150-200/HP range for a car with a blower. Economically that is a very bad ratio.
About 80hp and 90ftlb
Reducing backpressure technically will make life easier in the motor. But the claim of “last longer” is borderline lying. The length of time you warm your motor up in the morning will have a far greater effect on the life of the motor than the stock backpressure. In a scientific setting you would be hard pressed to prove that a reduction in backpressure will make the motor last longer. The rest of the car will be falling apart long before back pressure has any effect on your motor.
There is also not very much back pressure with the stock exhaust anyway. That’s why you don’t get big gains with headers, mid pipes and axle backs. Ford did a great job when they engineered the exhaust for the Mustang. It is not a 3rd Generation Camaro, that’s for sure (they have incredibly restrictive exhaust).
I am running 450HP right now through the stock manifolds and in the spring I will be running 650HP through them. I think its safe to say you will be fine with the stock manifolds.
To respond to post #3 & #4, I like my current system plus the fact that the supercharger runs efficiently at low boost pressure. I am using a KB BAP but throughout the dyno run, I maintained at 11.5 A/F so it is turned off at the moment.
To also respond to post #7, I am perfectly fine with where I am at now. Even though the car can withstand higher amounts of boost and horsepower, I am not one of these guys who runs 10 psi and 450rwhp. I have taken the philosophy that someone will always be faster and as long as I beat these ricers around here, that is all I care about. It seems like everyone is worried about rwhp but I am happy that I got 370rwhp on an automatic. My money is in my 69 Mustang 351w stroked to 408 which has about 600 hp. Thats why!
E-Force Supercharged! Long Tube Question! 
