Subtraction by Addition: CHECK! Sometimes I hate my car
So last month (maybe 2 months ago?) I dynoed a low 326whp and 330ftlbs when I had Dinan intakes, Magnaflow Mufflers and Dinan Tune.
Today I dynoed (granted it was over 90 degrees) 321whp and 338ftlbs at the wheel. Since the last dyno I went with Borla straight-thru mufflers, delete my resonator's, TMS Race tune and Magnaflow high-flow race cats.
I'm simply at a loss as to what is wrong with my car (if there is even anything wrong). Maybe I'm reading into the dyno too much but I like to see results after spending over 1k on upgrades.
A buddy on here and I raced our M5s against each other and we were basically even. His mods are Dinan 3.45, AA Intake, TMS Tune, SS Cans/XPipe. Here is the footage from that night. BMW E39 M5s Comparing Their Cars on Vimeo
We will be doing another race tonight from a 1st gear roll as all of these took place from 2nd and 3rd gear rolls.
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2001 Carbon Black M5: Retired to weekend duties and possibly selling it 1997 Techno Violet M3: New Cone Dodger and DD
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So last month (maybe 2 months ago?) I dynoed a low 326whp and 330ftlbs when I had Dinan intakes, Magnaflow Mufflers and Dinan Tune.
Today I dynoed (granted it was over 90 degrees) 321whp and 338ftlbs at the wheel. Since the last dyno I went with Borla straight-thru mufflers, delete my resonator's, TMS Race tune and Magnaflow high-flow race cats.
I'm simply at a loss as to what is wrong with my car (if there is even anything wrong). Maybe I'm reading into the dyno too much but I like to see results after spending over 1k on upgrades.
A buddy on here and I raced our M5s against each other and we were basically even. His mods are Dinan 3.45, AA Intake, TMS Tune, SS Cans/XPipe. Here is the footage from that night. BMW E39 M5s Comparing Their Cars on Vimeo
We will be doing another race tonight from a 1st gear roll as all of these took place from 2nd and 3rd gear rolls.
The WHP, while slightly lower than published specs, is still well within the "normal variance" for our beasts. Numbers I have seen around here foe expected variance in the S62 motor are +/- 10%. It could be the dyno...or just the fact that your beast is closer to the lower end of the specturm. None of the mods you describe reliably contribute HP...especially on a dyno. The just improve the driving experience.
Hope this helps (and didn't just make you feel worse)
Brian
__________________ 2003 Sterling Grey M5
Dinan Free Flow Exhaust, Dinan Rear Sway Bar Super Sprint Headers Custom tuned by ESS
Rogue Octane SSK and WSR
CNS Racing clutch and flywheel
DICE Ipod connectivity
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AngeliBright V3 6000k LED Upgrade, HID Fogs
Ultimate Pedals
BSW Stage 1 speaker upgrade/BSW Subwoofer
Rear Wheels Up Front (275s all around) Supercharged by ESS!! (Kit number 01)
The WHP, while slightly lower than published specs, is still well within the "normal variance" for our beasts. Numbers I have seen around here foe expected variance in the S62 motor are +/- 10%. It could be the dyno...or just the fact that your beast is closer to the lower end of the specturm. None of the mods you describe reliably contribute HP...especially on a dyno. The just improve the driving experience.
Hope this helps (and didn't just make you feel worse)
Brian
I understand it's within that 10% range but I would have figured adding those mods would have helped, not hurt my WHP on a dyno. The dyno was a dynocomm. Same one I previously did 326 on.
Oh I should note too that my car has nearly 137k on it
I understand it's within that 10% range but I would have figured adding those mods would have helped, not hurt my WHP on a dyno. The dyno was a dynocomm. Same one I previously did 326 on.
Oh I should note too that my car has nearly 137k on it
Did you dyno the car before the mods? If not, then you can't really be sure that those items actually hurt your dyno numbers.
I understand it's within that 10% range but I would have figured adding those mods would have helped, not hurt my WHP on a dyno. The dyno was a dynocomm. Same one I previously did 326 on.
Oh I should note too that my car has nearly 137k on it
DOn't lose too much sleep over SMALL changes on a dyno. Read Steve Dinan's white paper on dynoing modern cars. He basically shows that an operator can pretty much choose what HP to come in on.
5 whp change on a dyno is VERY insignificant. That's why many laugh when an aftermarket company clains 5 or 10 HP from a mod...it's literally impossible to show a difference.
In this case...it is possible that the exhaust mods actually hurt your performance. The loss COULD be real.
DOn't lose too much sleep over SMALL changes on a dyno. Read Steve Dinan's white paper on dynoing modern cars. He basically shows that an operator can pretty much choose what HP to come in on.
5 whp change on a dyno is VERY insignificant. That's why many laugh when an aftermarket company clains 5 or 10 HP from a mod...it's literally impossible to show a difference.
In this case...it is possible that the exhaust mods actually hurt your performance. The loss COULD be real.
Cheers,
Brian
And that's what I'm afraid of...Looking at the Borla mufflers, they're basically straight-thru so I would have thought torque loss as a possibility not HP like it was. And removing the resanator's and adding the high flow cats to replace my OEM 135k cats I again thought would have helped and certainly not hurt. Maybe a stock car is a healthy car haha.
The temperature difference between 2 months ago, late spring, and now, summer, would probably be enough to give that 5hp difference.
If not, I would blame lack of backpressure in the exhaust system from your new exhaust setup and the tune could be less than ideal.
If you dynoed them back to back, making sure the temperatures were the same, I would blame the mods. But from the sounds of it the temperature variance is to blame.
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