true blue 2432 dyno - IMBOC
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post #1 of 11 (permalink) Old 09-11-2014, 06:27 PM Thread Starter

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true blue 2432 dyno

Hi guys, I purchased an 01 bullitt and dyno'd (mustang dyno) 244 rwhp and 281 rwtq. Did i mention the car is 100% bone stock with 166k miles? Thought that was pretty great. In the past few weeks I installed a MAC cat back, a diablo predator tuner, and 373's. I went back to the same dyno (friend owns it) and dyno'd less!!! 277rwtq and 241 rwhp. Thoughts?
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post #2 of 11 (permalink) Old 09-12-2014, 12:01 PM
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Congrats on the purchase of Bullitt 2432. Welcome from your neighbor 2451.


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post #3 of 11 (permalink) Old 09-14-2014, 03:23 PM

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MANY things will make dyno numbers vary. To name a few: air, temperature, operator inputs. A dyno is a great tuning tool, but the actual numbers are not a good comparison tool. What really matter is the "seat of the pants" dyno, where I'm sure you noticed some gains lol.
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post #4 of 11 (permalink) Old 09-15-2014, 09:42 AM
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Also, peak numbers don't tell the whole story. It's the area "under the curve" that makes all the difference.

08 Bullitt 5389 13 FIAT 500 Abarth 00 Roush Cougar

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post #5 of 11 (permalink) Old 09-28-2014, 01:20 AM

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Quote:
Originally Posted by Loaded View Post
MANY things will make dyno numbers vary. To name a few: air, temperature, operator inputs. A dyno is a great tuning tool, but the actual numbers are not a good comparison tool. What really matter is the "seat of the pants" dyno, where I'm sure you noticed some gains lol.
I couldn't agree more with the above!!!

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post #6 of 11 (permalink) Old 09-28-2014, 06:49 AM
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Originally Posted by B3NN3TT View Post
Also, peak numbers don't tell the whole story. It's the area "under the curve" that makes all the difference.
I agree with Andy. Sometimes you will pick up HP/TQ at a lower RPM, etc.

But, that being said, Many folks do not realize that the stock mufflers have many dyno hours invested in them by Ford. Often, very often, louder is not better in many ways.

You can open up the exhaust system too much and lose power depending on the manifold/header being used. They work in conjunction with each other.

If the car is all stock, many times you will lose power opening up the exhaust too much.

If you google it, you will find dynos others have done showing this.

Many of the axle back manufacturers are really going for a unique sound rather than power.

Former owner of 6010.
2011 Mustang GT
Mods: JBA ss ceramic coated 1 7/8 headers with HF cats and stock axlebacks. Roush 2300 TVS supercharger with upgraded fuel delivery (47lb injectors, boost-a-pump, H0 plugs). Dyno'd 591 RWHP(w/stock exhaust). Boss oil cooler. Exedy 500 clutch w/billit steel flywheel. Whiteline rear LCAs, Tokico D-spec adjustable shocks/struts, BMR watts link and relocation brackets. Ford Racing "P" springs. DS shop carbon fiber driveshaft.

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post #7 of 11 (permalink) Old 09-28-2014, 09:40 PM Thread Starter

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old exhaust was rusted and had serious back pressure issues (was the reason i replaced it). We installed the "canned tune" from diablo and would NOT recommend it. At WOT i was 14.1 (way too lean) after messing with the diablo predator air/fuel adjustment we picked up another 8 rwhp. Didn't really get much hp or tq from messing with the spark advance. Has anyone messed with the spark advance on a hand held tuner? just curious where people are having there biggest power gains with "bolt on" bullitts with the spark advance. Thanks guys
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post #8 of 11 (permalink) Old 03-16-2015, 02:49 PM
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Tim

congrats on the new ride....my best mod was the 373's....my take plus seat of the pants too


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post #9 of 11 (permalink) Old 08-01-2015, 11:11 PM

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Gears will also cause you to show lower numbers on a Dyno, with 4.10 gears you'll typically show about 10 rwhp less. Crazy math stuff!
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post #10 of 11 (permalink) Old 11-09-2015, 04:03 PM

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I would like to confirm that to be for sure or not..interesting.


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post #11 of 11 (permalink) Old 11-09-2015, 04:36 PM
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I have always been under the impression that the dyno operator inputs the rear gear ratio into the software interface to account for this. Makes no sense that a gear change would give an inaccurate reading unless the software was not set up for it...
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08 Bullitt 5389 13 FIAT 500 Abarth 00 Roush Cougar

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