Tried all my tunes about 6 of them and they all perform worse with this new exhaust. No leaks, just had it looked at. Why am I getting less performance? Do exhausts need new tunes?
I think he has Pypes Violators. Hes been having some bogging issues with various tunes hes tried. I still say stop spending money on parts until you get the thing on a dyno and datalog a run or two.
Also remember the summer heat is gonna take its toll. My car lost 5 mph in the 1/4 mile because of the heat yesterday. And yes even with the blower if its heat soaked it can bog.
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2005 Ford Mustang GT Torch Red Manual
Saleen Supercharger 3.4 pulley/Brenspeed Tune
FRPP Stingers Axleback Muffler System
CHE Lower Control Arms
Pro-5.0 Super Shifter
CDC Sequential Tail Lights
Best ET NA: 13.408 @ 105.31
Best SC: 12.6 @ 114 on Pirellis
What kind of exhaust is it? Who installed it? To answer your question, an exhaust system does not require a tune. However, what I think happened here is that you lost back pressure to your exhaust, thus decreasing torque. This is the one concern one must have when installing a new exhaust system. Are you sure this exhaust system is specifically for your car? I'm assuming you didn't modify anything above the cats, right? I would return them and get Flows, or if you have the money- Bassani's. Some companies engineer better products that take all the negative effects into consideration.
What kind of "bog"? Exhaust shouldn't cause a bog. I agree there must be something else going on, Ive tuned these where after you get the transfer function spot on they run excellent, even after a exhaust change.
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93 Cobra Supercharged 342 Vortech T-trim...all sorts of stuff, by Thrill Ride Unlimited Mt. Vernon Oh.
What kind of "bog"? Exhaust shouldn't cause a bog. I agree there must be something else going on, Ive tuned these where after you get the transfer function spot on they run excellent, even after a exhaust change.
I am working with Tillmans on my bog issue, they want me to do some data logging. My bog is related to my overdrive not downshifting properly.
But why would an exhaust cause loss of power? like other poster said it could be back-pressure issue but these are Pypes violators and no review that I read prior to my purchase said anything about this. In fact they say a 5 to 10hp increase! I have never read anything about any performance exhaust giving less performance.
I am working with Tillmans on my bog issue, they want me to do some data logging.
But why would an exhaust cause loss of power? like other poster said it could be back-pressure issue but these are Pypes violators and no review that I read prior to my purchase said anything about this. In fact they say a 5 to 10hp increase! I have never read anything about any performance exhaust giving less performance.
Careful how you use "exhaust" hah! Mufflers are an entirely different topic than "exhaust" in general...
You shouldn't be seeing a loss in power. Maybe you're a victim to the negative placebo effect??? Are you SURE you've lost power?
You asked about a weird smell before...
Maybe you have a problem more serious than exhaust... Have you done any engine work lately? Did you mess with your midpipe? Is it time for an oil change? Maybe you have bad gas???
I don't think you should have any problems solely from mufflers...
Correct me if I'm wrong...
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All show... So far. Exterior: Roush Front Fascia w/o chin spoiler, Black Billet Foglight Delete Grille, hidden smoked foglights, GTS Blackout Panel, smoked tail lights, WebElectric Sequential tail lights, MUSTANG 3rd brake light, 14" Shorty Antenna. Interior: Red piping, RVinyl Aluminum Dash Kit, CDC Aluminum Pedal Covers.
Careful how you use "exhaust" hah! Mufflers are an entirely different topic than "exhaust" in general...
You shouldn't be seeing a loss in power. Maybe you're a victim to the negative placebo effect??? Are you SURE you've lost power?
You asked about a weird smell before...
Maybe you have a problem more serious than exhaust... Have you done any engine work lately? Did you mess with your midpipe? Is it time for an oil change? Maybe you have bad gas???
I don't think you should have any problems solely from mufflers...
Correct me if I'm wrong...
Smell is gone. Got oil chang 50 miles ago. Cleaned the MAF. It seems strange but I did loose a little power, and WOT sometimes doesnt produce much.
After the MAF cleaning it did feel a little better but still a slight drop in acceleration. I can tell that WOT seems weaker and harder acceleration is weaker. Seems like my 0 to 60 increased significantly, perhaps by 1 second
I think he has Pypes Violators. Hes been having some bogging issues with various tunes hes tried. I still say stop spending money on parts until you get the thing on a dyno and datalog a run or two.
Also remember the summer heat is gonna take its toll. My car lost 5 mph in the 1/4 mile because of the heat yesterday. And yes even with the blower if its heat soaked it can bog.
Heat seems to be the culprit but at 75 degrees + thats a bit cool for a bogging issue. I am done getting mods but the only other one I want until warranty is up in 2015 is 4.10's and I can wait for that.
Can a simply dyno run do it or do you think I need to get the whole $400 3hr tuning done?
Smell is gone. Got oil chang 50 miles ago. Cleaned the MAF. It seems strange but I did loose a little power, and WOT sometimes doesnt produce much.
After the MAF cleaning it did feel a little better but still a slight drop in acceleration. I can tell that WOT seems weaker and harder acceleration is weaker. Seems like my 0 to 60 increased significantly, perhaps by 1 second
The ECU might need to be recalibrated... Disconnect battery for maybe 20 minutes... See if that fixes anything.
Gas could possibly be bad... How much is left on this tank? What did you put in it?
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All show... So far. Exterior: Roush Front Fascia w/o chin spoiler, Black Billet Foglight Delete Grille, hidden smoked foglights, GTS Blackout Panel, smoked tail lights, WebElectric Sequential tail lights, MUSTANG 3rd brake light, 14" Shorty Antenna. Interior: Red piping, RVinyl Aluminum Dash Kit, CDC Aluminum Pedal Covers.
Reset ECU....fixed it but only for about 15 miles. Shell gas.
If resetting the ECU fixed it, we have now narrowed down the problem! I'd recommend putting the stockers back on. If the performance goes back to the way it was, you know what the problem was! If you still have problems with the stock mufflers back on, you have a more serious problem.
Shell gas is good, thats probably not the issue.
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All show... So far. Exterior: Roush Front Fascia w/o chin spoiler, Black Billet Foglight Delete Grille, hidden smoked foglights, GTS Blackout Panel, smoked tail lights, WebElectric Sequential tail lights, MUSTANG 3rd brake light, 14" Shorty Antenna. Interior: Red piping, RVinyl Aluminum Dash Kit, CDC Aluminum Pedal Covers.
If resetting the ECU fixed it, we have now narrowed down the problem! I'd recommend putting the stockers back on. If the performance goes back to the way it was, you know what the problem was! If you still have problems with the stock mufflers back on, you have a more serious problem.
Shell gas is good, thats probably not the issue.
Yes I still have problem with the stocks. the ecu recal fixes the bog for a very short time, but not the exhaust performance
New exhaust now slower 
