LT Headers Low-Mid Range Power Loss

[spoole96]

I had my log tube headers installed today. I added a tune for headers before I left the shop. I too felt like I had lost a lot of low end to mid range torque. Rough idle and I kept waiting for it to die. I wasn't sure I was going to make it home... When I got home I loaded the original tune (before header) and the car actually seemed to run better. More throttle response and smoother acceleration. Go figure.

Yes it is much louder to the point I'm not sure they will stay especially if it seemingly runs weaker. As to having to dyno I'm not sure why I'd be using a tuner if I need to dyno changes I make??

Mine is a hell of a lot louder as well with the high flow cats too. But I don't want to get rid of them. I like the power up high and the sound is insane. I just want to get some these daily drive ability issues smoothed out down low. The tuner should be able to get it worked out though. Probably 30-40% of the people on this forum are running his tunes. He's actually the one that told that they have been seeing torque losses at those RPM ranges. And my fucking BUTT DYNO tells me it's not running like it should. My brother drove it today and he can tell the tune is probably off a bit as well. His BUTT DYNO is calibrated over 900whp from his Lethal Racing "Black Widow" project, GT 500, @ now a Lethal Racing/Lingenfelter ZR1. I'm gonna give the tuner plenty of attempts to get it right since I have lifetime tunes for free any was ;). If they can't get it dialed in with data logging, then I'll get it dyno tuned by Lethal Racing or maybe I'll have to make a trip to Houston to visit Livernois!

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[Chargedguard5.0]

I don't have headers but I have a blower and experience the same thing. I also had the same issue when I just had a cai and tune from a different tuner. It just feels like at dog through those rpm ranges. It never did it when it was stock. Getting it dyno tuned at the end of next month I hope they can figure it out.

 

[09jsw]

I had my log tube headers installed today. I added a tune for headers before I left the shop. I too felt like I had lost a lot of low end to mid range torque. Rough idle and I kept waiting for it to die. I wasn't sure I was going to make it home... When I got home I loaded the original tune (before header) and the car actually seemed to run better. More throttle response and smoother acceleration. Go figure.

Yes it is much louder to the point I'm not sure they will stay especially if it seemingly runs weaker. As to having to dyno I'm not sure why I'd be using a tuner if I need to dyno changes I make??

That's weird, my car ran perfect without even a tune in it yet. My car is an animal now with the Lund tune from Lethal Performance

 

[Tommy V]

Its not the tune its the torque management and clutch protection,I did two line locks back to back and on the second one,half way through it just slowly cut all the power.The p zeros starting sticking real good.They just released some new parameters to turn those protections off or adjust them.Well sct did!!!!!.My car was bone stock when it did this.SORRY GUYS POSTED IN WRONG THREAD.

 

[Livernois Motorsports]

"...I'm gonna give the tuner plenty of attempts to get it right since I have lifetime tunes for free any was ;). If they can't get it dialed in with data logging, then I'll have to make a trip to Houston to visit Livernois!

HOUSTON WE HAVE A PROBLEM :doh:

We are located right around the corner from Ford World Headquarters in Dearborn Heights, Michigan.

We can still tune your car! We also offer lifetime tuning support. We have remotely tuned hundreds of Mustangs already at this point. I even have 3 S550 builds in progress in my shop at the moment. Here is a video of a 5.0L that we tuned shortly after she left the dealership:

Here is a link to our site where you can find our tuning solutions for your car:
http://www.livernoismotorsports.com/products/2015%2b-Mustang-5.0-Tuner.html

 

[Fordified302-4v]

i installed my long tubes on saturday and thought for sure i lossed tq. i have not dynoed the car yet but i feel their is something in these cars that is keeping the tq lower verses the older coyotes. not sure if its the different cams or the different intake. maybe its something to help with the longevity of the IRS in these cars. my 12 would pull to 7300 pretty hard before it would start feeling like it was nosing over. these start nosing over hard at 7000 they feel. i know peek is well before that. i just know their is a differance between the two other than weight. Has anyone tried a stock 11-14 intake on a 15 yet? it might have something to do with the new design.:shrug:

 

[UPRSteve]

I would look at other sources for tuning. Between the Lund Camp and Livernoise, I'm sure either of them will get you much better results!

 

[Todd15Fastback]

I would look at other sources for tuning. Between the Lund Camp and Livernoise, I'm sure either of them will get you much better results!

:cheers::cheers::cheers::cheers:

 

[bobc775]

I contacted my tuner this morning. He indicated they have not had any issues with the tune I used. It was suggested I check for updates for my programmer, download the tune again and try re-flashing. I did find a new update for my programmer so I updated and followed the tuners suggestions. I took the car out for a test ride and it really ran much better. Even the exhaust noise was manageable. They asked me to do a data map so I set up for that. Everything seemed to be going well until I returned home and found that my engine light was on. Checked the DTC codes and had a P2004 and P2011. I sent them the data log and hope we can get stang under control. Much brighter light today than yesterday..

 

[Guard5.0]

Probably is something going on with the headers. My tuners shop car and my car spit out similar numbers stock which was to be expected. They put the Roush SC on theirs and got approx. 565 rwhp with the base Roush tune as the only mod through the stock exhaust. I got the full ARH system installed without any tune and picked up 30 rwhp. Car was rolled back into the shop where the same Roush SC was installed with the same base calibration. Now granted, these are dyno numbers but at least it's the same dyno so you would expect mine to be a little north of the 565 they got with theirs. Nope, 535 rwhp. If it would have been the same or a little above I would not have been surprised. Being 30 below theirs tells me the tune doesn't exactly agree with something. The only discernable difference in the cars is the exhaust. The tuner expected 650 at the crank for mine but the actual number is probably around 620 as it sits now.

 

[spoole96]

HOUSTON WE HAVE A PROBLEM :doh:

We are located right around the corner from Ford World Headquarters in Dearborn Heights, Michigan.

We can still tune your car! We also offer lifetime tuning support. We have remotely tuned hundreds of Mustangs already at this point. I even have 3 S550 builds in progress in my shop at the moment. Here is a video of a 5.0L that we tuned shortly after she left the dealership:

Here is a link to our site where you can find our tuning solutions for your car:
http://www.livernoismotorsports.com/products/2015%2b-Mustang-5.0-Tuner.html

Well that sucks for me lol. I thought you guys are out of Houston.

 

[spoole96]

But wait. I must be wrong about my car not running right. I haven't had it dyno'd so there for I can't tell if it's running smooth. :doh:

My car is definitely not running at optimal performance down low and in the mid. It's also VERY hesitant when I drive it the first time after its been sitting over night. Even if I let the car warm up to normal temps. It definitely didn't do this before the headers and new tune.

 

[Tommy V]

Has anyone tried running their longtubes without doing the tune for the headers.Im not saying no tune on the car at all!!!!,just the tune for the headers.Arh had a car pick up 30 hp just with headers without tuning it for the headers.My opnion the 02,s are a little futher down stream and may not have to be fulled with to begin with.

 

[BlownStang15]

Is anybody noticing any low to mid RPM range power loss or lag after installing LT headers with an updated tune? I have been working with my tuner. But, I still notice some lag or power loss in the 2k-3.5k RPM range. My tuner told me:

" I have made some changes to the Ti-VCT settings, which will help a little but we have noticed some power loss with long-tubes in the mid-range. Please use these files and let me know how it feels"

I'm still working with the tuner. I've datalogged once already. And I'll probably datalog again. I'm just curious if anybody else is having any issues. It very noticeable for me since this RPM range is normal driving. Over 4k RPM feels very strong though.

What size are your primaries?

Long tube headers with large primaries could reduce the bottom end in a standard motor. For example, if your primaries are too big and straight, you will reduce the scavenging effect at low RPM and cause rough idle and a loss in bottom end. These headers would be more suited to a blown or worked engine.

In standard or mildly tuned motors it is better to have slightly smaller primaries, with some strategically placed mandrel bends to speed up the exhaust flow at low RPM where there is little gas flow from the motor, thus improving scavenging and allowing the motor to build power faster. There is some lower level physics which I will not go into, but that is the general idea.

 

[Fordified302-4v]

Has anyone tried running their longtubes without doing the tune for the headers.Im not saying no tune on the car at all!!!!,just the tune for the headers.Arh had a car pick up 30 hp just with headers without tuning it for the headers.My opnion the 02,s are a little futher down stream and may not have to be fulled with to begin with.

I am running my car with long tubes and no tune for them, i installed BBK 1- 3/4 long tubes and put the rear 02's in the place wear my wide band would go with defoulers, then welded new bungs on the front cylinder tube on oneside and the rear cylinder #8 on the other for the wideband, and beat the tar out of it saturday night. even ran a buddy who is making 440rwhp with his 15 and either would stay door to door with him or he would pull me by a car in 4th. but he said that my car is probably running fat up top because its trying to cool the cats that are not their. with a tune i would probably stay with him in 4th. just a canned diablo tune in the car and thats it. no aftermarket CAI on the car.

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