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Old 05-13-2010, 03:20 PM   #1
HeavyD

 
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RotoFab + JBA Shorties + MBRP only makes 10hp!

Ok, first of all I don't want to hear anything about long tubes! I know long tubes are the way to go for more power and all that. I wanted to do as much to my car as possible to improve sound and performance without having to tune anything so I could keep my warranty!

I had my car dynoed before, here;

http://www.camaro5.com/forums/showthread.php?t=74584

Since then I installed a RotoFab CAI, JBA 1812s shorties and the MBRP cat back, s7024304. I also did the fuse pull and have been running ultra 94 fuel. I went back today for after dyno run to see the gains. I did 4 runs, on a Mustang dyno, same place as before. Averaged 320 hp and 343 ftlbs for torque. My average before was 311hp and 318T. Overall my gains are 10hp and 22 ftlbs of torque. I have to say that honestly I am pretty disappointed. This is certainly not what I was expecting, or what most people claim to get. This is all without a tune. I know these discussions kinda go on and on, but I think I may be the first one to have done all this, with before and after dyno results, without a tune. I think we can definitely put it to bed that shorties and a CAI really don't do much at all for power. If you want to keep your warranty and have no desire for a tune, then save your time and money. As for the catback, I wouldn't go that route either! If I could do this again I would start with a muffler delete, then go with just an axle back if needed. For those getting better improvements with a tune, thank the tune, not the bolt ons! My car sounds better, seems to have a bit more power in the butt dyno, but overall the money spent wasn't worth it in the end!
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Old 05-13-2010, 04:19 PM   #2
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well the cat back should of gained you nothing. the intake should be good for 12-15hp. And Ive read some articles that showed shorties actually losing horsepower. When people say shorties are not worth even having they really mean it. Im not really surprised.
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Old 05-13-2010, 04:28 PM   #3
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That sucks. Good info for those of us still sitting on the fence.
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Old 05-13-2010, 04:48 PM   #4
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Yep, here it is! If you are in the fence, here is the proof in the pudding!
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Old 05-13-2010, 05:06 PM   #5
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Maybe it's just me but those results don't look right. That chart is all over the place. Was traction control on or something? I know it's an L99 but shouldn't it be smoother than that? Even the stock looks janky.


Edit: Found a stock L99 sheet for comparison.
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Old 05-13-2010, 05:22 PM   #6
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any thoughts on those numbers? i feel like you should be putting out anywhere in the 370's at least
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Old 05-13-2010, 05:43 PM   #7
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These are normal for L99's on a Mustang dyno. The dyno graph is compressed to show all gears during the run.
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Old 05-13-2010, 05:57 PM   #8
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I kind of figured that was the case. Is this sheet a comparison of the two runs or is it of multiple runs of the final setup?
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Old 05-13-2010, 06:02 PM   #9
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That dyno report looks more like a lie detector test than a dyno run. It doesn't show the AFR nor does it show the RPM's across the bottom of the graph throughout the run. Typically you would see the horsepower and torque lines crossing at about 5250 rpms. I would seek out another dyno if I were you.
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Old 05-13-2010, 06:02 PM   #10
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I am guessing your intake makes what it should, and maybe the shorties cost you some hp.

Sorry man. That stinks.
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Old 05-13-2010, 06:04 PM   #11
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The graph I included in this post is one run after my bolts ons were installed. It is only one run, the spikes are just the car going through different gears. This test started at 0 mph and peaked at 147. Look at the time duration at the bottom. The best horse power was developed in 4th at around the 19sec mark.
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Old 05-13-2010, 06:17 PM   #12
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Have you superimposed this run with your baseline and compared the results across the board. You may not have picked up a huge amount of peak horsepower/torque but what were the results throughout the rest of the range? Did it affect the low or mid range power at all?
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Old 05-13-2010, 07:10 PM   #13
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That same intake gave me 10 hp. To look at the bright side, you could say the other mods are good weight reduction...
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Old 05-13-2010, 07:48 PM   #14
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Actually v6sonoma, that is an excellent idea. I did just that. I got one run from each with pretty much identical accelerations/RPMs. It isn't as bad as I though. Here are my gains by gear;
1st - stock 200hp/193t AFTER - 214hp/200t GAIN 14hp/7t
2nd - stock 258hp/270t AFTER - 276hp/276t GAIN 18hp/6t
3rd - stock 300hp/309t AFTER - 312hp/335t GAIN 12hp/26t
4th - stock 310hp/308t AFTER - 320hp/328t GAIN 10hp/20t
5th - stock 270hp/318t AFTER - 290hp/343t GAIN 20hp/25t

I guess it really depends how you look at it. The hp gain in 5th is just before I let off on the throttle, not the spike at the gear shift. When you redo the averages like this I get peak increase of 20 hp and 26 ftlbs of torque or 15hp gear by gear average with a 17 ftlbs of torque. I feel better looking at this this way. You can see the increases clear as day on the graphs shift by shift. What do you think?

Last edited by HeavyD; 05-13-2010 at 08:05 PM. Reason: math
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