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Old 07-30-2009, 03:19 PM   #1
pcmforless

 
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Another L99 Dyno tune (with headers and CAI)

Had this L99 on the dyno last night and have to say I am very impressed with the gains headers are giving these cars. Baseline, the car pulled 343HP and 367 torque at the tires with the ARH headers and cold air intake. After the tune 367HP and 387 ft/lbs. This car picked up a little more HP from the tune (24/25 at the tires) but less torque (20Ft/lbs) than the bone stock L99 I did last week (22hp and 42Ft/lbs if I remember correctly). First dyno sheet will be baseline vs Final tune, 2nd will be the baseline of last weeks bone stock car vs baseline of headers/cai car to give you an idea of the gains for those two mods and the fine will be last weeks baseline bone stock l99 vs final tuned with headers/cai run from yesterday. Once again, the stock tune has proven to be VERY rich like we keep seeing. This car dipped into the 10's on the air/fuel on the baseline. On the runs from the bone stock car last week, ignore the air/fuel lines as it was not reporting to the dyno and I was using my portable unit.
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Old 07-30-2009, 04:29 PM   #2
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Great gains there!!
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Old 07-30-2009, 04:32 PM   #3
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Nice numbers
All the L99s needs are a few mods and a tune to really make some real good HP.
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Old 07-30-2009, 04:40 PM   #4
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Very nice gains. What CAI did you use for this dyno run? Pics of CAI?
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Old 07-30-2009, 06:47 PM   #5
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You guys are really pushing me over the edge.
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Old 07-30-2009, 06:54 PM   #6
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That's fantastic. Now I just need someone to give me free ARH headers.
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Old 07-30-2009, 08:00 PM   #7
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That was my car on the Dyno. The CAI is a New Era. The roads were wet last night when I got it tuned so I did not get a chance to push her hard. Today all I have to say is OMG! I need to get to a track to see what she will do but I am impressed with the improvement with the mods and tune. The difference in torque is unreal and with the lower L99 gears she pull like hell in first and second. Bryan at PCMforless did a great job. I had him turn the AFM off until 55 mph. I like that much better but might consider turning it off completely. With the headers, even with the tune, there is still more noise with AFM at cruising speed than I like.
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Old 07-30-2009, 08:20 PM   #8
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how was the car before the mods
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Old 07-31-2009, 06:51 AM   #9
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Before the mods it ran good. It was what I expected. Unfortuantely I don't have any documentation like time slips, but I was totally happy.
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Old 07-31-2009, 06:58 AM   #10
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Um yeah, nice work! 60hp! Shawwwweeeeeeeet!
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Old 07-31-2009, 08:08 AM   #11
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Dang see that is what I would like, AFM off until 55.
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Old 07-31-2009, 08:14 AM   #12
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From what I was shown when my car was being tuned, there are a lot of options with the AMF. It does not have to be an all on or off option. I wanted to leave it on above 55mph to still take advantage of the increased gas mileage when I was cruising. The car is somewhat a daily driver for me. I do not know all of the ways the AMF can be adjusted but based on speed is one. It can also be made more or less sensitive. Someone that does tuning I am sure could give a more detailed explaination.
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Old 07-31-2009, 08:23 AM   #13
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Are the headers long or short tube? If long are they OK in PA with inspections? Will you look at catback exhaust now? Looks like the L99 is now getting close to LS3 levels.
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Old 07-31-2009, 08:39 AM   #14
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I have ARH long tube 1-7/8" with 3" all the way to the stock muffler. This includes the high flow cats. I understand that in PA what matters is if it passes the emissions not if you have LT headers. I guess it remains to be seen if I will have any problems passing the emissions, but I was told I should not. I don't need a catback because everything was replaced to the axle with the ARH system. I do not plan on replacing the stock muffler at this time because I like the fact that the car is quiet when cruising and really comes to life (nice loud muscle car sound) when I put my foot into it.
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