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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 05-13-2010, 03:20 PM   #1
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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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Old 05-13-2010, 08:04 PM   #15
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I guess the next test is to take that thing to the track! Get some good 1/4 mile times. lol Sometimes what a part does or doesn't do isn't always clear. Ask the cam guys out there. There are plenty of cams that will give high #'s on a dyno but cut the balls off of the low end and hurt more than help.
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Old 05-13-2010, 08:12 PM   #16
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Even my wife new the car had more power just by the way it feels. Woman's intuition is a powerful thing!
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Old 05-13-2010, 08:13 PM   #17
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regardless of the dyno results,with the mods you have installed,the only one that is going to net a little HP is your CAI.
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Old 05-13-2010, 08:50 PM   #18
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your stock hp number of 311, isnt that below average of what L99s usually put out or is it because of the dyno?
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Old 05-13-2010, 09:18 PM   #19
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It is well documented that Mustang dynos show the lowest power results due to their correction factors or whatever.
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Old 05-13-2010, 09:31 PM   #20
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I'm sorry about your results. However, I wouldn't put too much into it, because you dyno'd on different days and, shoot, sometimes a car just isn't consistant. My car, on the same day, within the same ten minutes would very 10 RWHP. I'm not calling you a liar, or saying that the gains still very disappointing, but I think it may be better to try to think of your improvements in ways other that power. For example: I'm sure the car sounds better, and the engine comparment and tips look better than stock. Also, I'm sure your car lost a bit of weight too...

I know... all that doesn't mean sh*t. It has been said there is little to no gains from shorties OR a catback. Honestly, I really think a more aggressive tune would be benefitial, but I understand what you were trying to do. For me, I've been contemplating shorties, if only for a little more power (I'm hoping for FI when the time comes) and definately better sound. Personally - I realize that's about all I could expect, but it's all about how it feels in your gut.

Regardless - I'm sorry the gains weren't what you were hoping for, however, I think you've got a great combination and I thank you for posting your experience. You may have saved some people several (maybe even close to) a thousand bucks! That doesn't help you, but I certainly appreciate your coming on and posting. How about you get some videos up so we can enjoy what you've got going on?

Respectfully...
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Old 05-13-2010, 09:39 PM   #21
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Looks like an EKG machine

He must of had it on while shifting up through the gears.

When they dynoed my L99 they got into 4th, started recording and hit the gas! Much smoother curve.

Mustangs will read a little lower, so 10 might be 12-15 on a dynojet. I was putting out 356RWHP with my L99, roto-fab & corsa cat-back on a dynojet.
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Old 05-13-2010, 09:58 PM   #22
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Quote:
Originally Posted by d69chris View Post
Looks like an EKG machine

He must of had it on while shifting up through the gears.

When they dynoed my L99 they got into 4th, started recording and hit the gas! Much smoother curve.

Mustangs will read a little lower, so 10 might be 12-15 on a dynojet. I was putting out 356RWHP with my L99, roto-fab & corsa cat-back on a dynojet.

This is the proper way. You don't graph out the entire run through the gears, just 4th.
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Old 05-13-2010, 10:27 PM   #23
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Quote:
Originally Posted by d69chris View Post
Looks like an EKG machine

He must of had it on while shifting up through the gears.

When they dynoed my L99 they got into 4th, started recording and hit the gas! Much smoother curve.

Mustangs will read a little lower, so 10 might be 12-15 on a dynojet. I was putting out 356RWHP with my L99, roto-fab & corsa cat-back on a dynojet.
Do you have Headers?
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Old 05-13-2010, 10:51 PM   #24
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Do you have Headers?
He stated he has JBA shorties ..... and yes that is the wildest dyno chart .... really never seen a chart that they record while going through the gears .... hmmm I wish I new a little more on what the problem maybe but ... wow I would expected a little bit more..... but its understandable on what path you are taking with staying in the limits of the warranty.
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Old 05-13-2010, 11:33 PM   #25
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The mods you did are kind of "nothing" mods in terms of power without a tune. In the simplest terms, you can't just strap parts on a car and expect the computer to know how to use them. In some cases the stock computer will actualy try and learn mods away. It wants to run like stock and makes adjustments to do so.
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