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      06-18-2015, 08:20 PM   #1
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2008 M3 with light mods on Mustang Dyno

Just thought I would share. Originally wanted to do a before/after comparison with my test pipes and tune but unfortunately timing didn't work out. Was hanging at a friend's shop a couple weeks ago so we threw it on there.

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K&N drop-in filter
ACM test pipes
OEM exhaust mod
BPM stage 2 tune

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      08-12-2015, 08:56 PM   #2
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Those seem like disappointing numbers after the stage 2 BPM tune/w TPs. I get its a mustang dyno but damn. Did you get the 240E software?
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      08-12-2015, 09:23 PM   #3
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Not bad for a mustang dyno man. Can't compare the M, but my G37 dyno'd 321 on a dyno jet and 280 on a mustang on back to back days. Not worth a whole lot, but 41 hp is a pretty big difference. Mustang dyno ratings (depending on how the shop maintains and calibrates it) are usually extremely underrated.

I saw a brand new hellcat put down 528 baseline on a mustang. Rated for what? 714.
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      08-14-2015, 11:46 AM   #4
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Why didn't it run to 8300rpm? Peak rated power is at 8250rpm... not that it'll be significantly increased, but there's still power you're not measuring according to your plot.
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      08-14-2015, 12:25 PM   #5
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40HP increase for exhaust and tune seems pretty decent.
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      08-14-2015, 12:27 PM   #6
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A dyno isn't your end all power. It's more of a tool for measuring gains after modifying components. A 40hp gain is pretty substantial.
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      08-15-2015, 01:01 AM   #7
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Quote:
Originally Posted by E92Brembo
Those seem like disappointing numbers after the stage 2 BPM tune/w TPs. I get its a mustang dyno but damn. Did you get the 240E software?
Mustang dynos read pretty low.
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      08-15-2015, 08:27 AM   #8
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That is right on part for the mods u have give or take a couple hp.
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      08-15-2015, 09:32 AM   #9
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Quote:
Originally Posted by Mike Benvo View Post
Mustang dynos read pretty low.
+1! Mustang dynos read lower wheel HP numbers than dyno jet dynos. However, if you look closely, the dyno estimates Max crank HP. So if you agree with BMW that we are making 415 CHP stock, he is now at 452CHP according to the mustang dyno. That's an ~37hp gain from all his mods.
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      08-15-2015, 01:01 PM   #10
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did you do all mods at once? did you notice a difference in acceleration?
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      08-15-2015, 03:35 PM   #11
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Ok...I'm completely stock except a Borla axel back which shouldn't yield and performance gains other than weight reduction. I went to the SAME shop and used the SAME dyno and tested 8hp and 4tq below this one...these numbers are low gents. Thousand dollar tune and testpipes for 8hp? No thanks.
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      08-15-2015, 03:57 PM   #12
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Yeah but the ambient conditions could be different, mechanical condition of both cars could have swayed those numbers, differing tire sizes - again, a dyno is a tool best used to measure gains relative to that specific car and not an end all answer to how much power a specific model car should be putting down.
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      08-15-2015, 04:39 PM   #13
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Quote:
Originally Posted by E92Brembo
Ok...I'm completely stock except a Borla axel back which shouldn't yield and performance gains other than weight reduction. I went to the SAME shop and used the SAME dyno and tested 8hp and 4tq below this one...these numbers are low gents. Thousand dollar tune and testpipes for 8hp? No thanks.
On a different day, with different conditions, different strap down, different spark plugs, maybe different wheels, means nothing. The delta is all that matters.
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      08-15-2015, 05:57 PM   #14
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Alright...so how much should I see with a BPM tune and resonated xpipe? I was totally all about S2 BPM until this morning at the dyno place. Obviously I'll have the same wheels, straps, staff etc...

PS. It's summertime in FL...conditions are the same everyday. Humid, hot, miserable.
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      08-15-2015, 06:15 PM   #15
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Quote:
Originally Posted by E92Brembo
Alright...so how much should I see with a BPM tune and resonated xpipe? I was totally all about S2 BPM until this morning at the dyno place. Obviously I'll have the same wheels, straps, staff etc...

PS. It's summertime in FL...conditions are the same everyday. Humid, hot, miserable.
If you remove the cats, somewhere in the area of 15-30whp.

Remember that on the dyno, the car gets really hot and dials back timing. The car will normally produce more power on the road than it will sitting on a dyno.
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      08-16-2015, 03:47 PM   #16
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Correct me if I'm wrong but wouldn't removing all cats add 15-30 hp by itself even without a tune? Is the tune just for cleaner/smoother graphs or is there a power increase as well.

Thx
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      08-16-2015, 04:02 PM   #17
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Quote:
Originally Posted by E92Brembo View Post
Correct me if I'm wrong but wouldn't removing all cats add 15-30 hp by itself even without a tune? Is the tune just for cleaner/smoother graphs or is there a power increase as well.

Thx
It should be somewhere in the 15hp range with no tune. You should see a decent power increase from a tune due to the AFR being adjusted and now adjusting the car to accompany the lack of cats.

A tune squeeze the efficiency out of the mods already put on the car. That's how I've always been taught.
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      08-16-2015, 04:17 PM   #18
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Yes, a tune will add power and clean up air fuel ratios as mentioned above. I would say it's worth every penny if you're going to remove all 4 cats.

This is before we even talk about the check engine lights you'd throw by removing all 4.
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      08-16-2015, 06:07 PM   #19
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I would put a cat free x-pipe at 20-25 rwhp and a tune at 5-10 rwhp.
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      08-16-2015, 06:31 PM   #20
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a tune on a decat, makes more than 5-10rwhp. Don't listen to people who don't have an understanding of how tunes work. Or perhaps the 5-10rwhp is what you get when you add new bearings to a used '08, and switch to M1 0W40?
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      08-16-2015, 08:23 PM   #21
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I think Dinan advertises about 27 or so HP increase with removal of the cats and a tune.
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      08-16-2015, 08:34 PM   #22
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Below is a link showng a tune adding less that 5 rwhp to a fully catless x-pipe car.

http://www.superstreetonline.com/how...rades-part-ii/

The tune was by ESS and the dyno testing by EAS, both very respected contributors to the forum. The article was part of a series by Super Street/European Car magazine.
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