Hp Variances From Mods??

To me, it seems as though there are some inconsistencies in hp received from mods performed. I myself saw a 20hp increase from headers/xpipe alone and once tuned saw an additional ~5hp increase across the board with the same peak numbers. Then, you read about a guy verifying 30hp from headers and an additional 20-25hp from a tune. Read about another car getting 30hp total from headers, full exhaust, cai and tune. Watch the jlt videos and see a stock car get 30hp from their intake and their tune but I believe most of those gains are from the tune. Then there are people bolting the intake on and only getting 1-5hp tuned. It just seems to me that the numbers on our cars are all over the place. Given the research I had done, I expected to gain a conservative 15hp from headers (got 20) and another 15-20hp from the tune alone yet I didn't get it. And before some says sae vs std or one car versus another, the examples I am referring to are apples to apples. For me, I have a hard time believing that there's a huge difference between Lund, AED, VMP, Livernois, Revolution etc tunes other than drivability and maybe a few hp. I know I'm not the only one to notice this, what's your take?

Thats unusual where you on the same dyno both times? Did you adjust for temps? humidity,etc

Mods often have diminishing returns I have never really seen why though. So headers might give you 20 and tune might give you 20 but both only give you 25.

Yessir, on the same dyno same day using sae numbers

chops44 said:

Yessir, on the same dyno same day using sae numbers

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What where your final numbers and what gas?

For simplicity sake, I'll just do this. It has all the details.

http://www.mustang6g.com/forums/showthread.php?t=81203

You gained power under the curve from the tune even though the peek looked the same

You mentioned there was some tweaking done to the tune. If that's the case then that could explain your peak numbers being the same but the power increase under the curve. As far as the lower power gain than expected, well every car is different :shrugs:

Correct, there was 5 under the curve found In my case. I'm just using my graph as an example to compare to others and not necessary complaining. It's interesting how there can be a 10-20hp spread with "like mods" between cars and wondered if anyone else had noticed this.

chops44 said:

Correct, there was 5 under the curve found In my case. I'm just using my graph as an example to compare to others and not necessary complaining. It's interesting how there can be a 10-20hp spread with "like mods" between cars and wondered if anyone else had noticed this.

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Honestly I would say it's pretty common to have a 10-20hp variance. When you're getting up that high in hp, 10 isn't much, like a 2% difference.

octane?

many of the better dyno results are on dedicated race fuel, or e50-e85. Makes a big, big difference. Octane is a legit "mod" on this car, more than lower compression engines.

All my pulls were made on 93 octane as were the examples I'm referring to. Some of these examples have an or xpipe which I'm sure is worth another 10 or so up top over the same style catted x.

off road pipes are worth 9hp on every dyno I have seen.