I thought that, but smoothing is already 5, which is the highest it gets, would be a picasso on less than that.I was thinking the same thing. Seems that there is quite a bit of sawtooth throughout the pull. Maybe the graph wasn't smoothed out?
1 - Not sure why, both the gt500s ours and a customers we have had on the dyno just read the same. really doesn't effect anything though..Why is that graph so bad? the tune or dyno is jacked up..
PS. If doing headers, may as well go for 2".
Not sure the questions. before and after headers are both to just over 8kAre the 2 pulls up to different rpms??
I can for certain tell you a shaky dyno results in a shaky car. It also tends to say the car is riding the knock sensor way wayyyyyy too much and the car is fighting/being forced to hit targets it shouldnt be if not for dyno glory runs. lets see thos graphs with 0 smoothing ..1 - Not sure why, both the gt500s ours and a customers we have had on the dyno just read the same. really doesn't effect anything though..
2 - Why? Bigger in not always better, not sure why people think that. The results here are amazing. And the design is amazing. Palm beach just did a 2" set of Kooks and the gains were about 1/3 of what we saw with the 1 7/8. If you aren't making 1100-1200 wheel, it's overkill, and costing you power and torque.
Im also confused on the suggested HP gains. 68x oem and 728 exhaust/no tune? Im guessing thats going from catted to catless AND headers, not just headers, which is the gains im interested in
Part 1 we did tune only which took us from 660's to 680s. phase 2 was the headers which took us from 684-728
Not sure the questions. before and after headers are both to just over 8k
The difference with us and everybody else is we don't play games or provide sub par info. We do real testing with real numbers.I can for certain tell you a shaky dyno results in a shaky car. It also tends to say the car is riding the knock sensor way wayyyyyy too much and the car is fighting/being forced to hit targets it shouldnt be if not for dyno glory runs. lets see thos graphs with 0 smoothing ..
so catless AND headers gained that #, VS PBD Header only test ( was already catless) This is why i dont appreciate or take at face value word games vendors do. Word play and a horrendousily shaky graphss.. Not looking good.
Going back and looking, it does appear that it had cat deletes already so i wouldn't expect as large of a gain, i'm not sure what the diff was from catg deletes and not, i didn't see a video on that as the only mod.Just got done watching the Palm Beach dyno video for the Kooks header install, only approximately a 17hp gain with a tune, that is some very costly hp.
So, when going from "stock headers" which have cats, to Long tubes, which have no cats. Some of the gains come from the catless and some gains come from the headers......I thought that was common sense.A lot of words for " no word play"
Figure the tune out, or the dyno, whichever is jacked. Or post a 0 smoothing..
So, we agree, the 4xhp gains are mostly from going catless.
Again, might as well go with 2", no one wants to leave free HP on the table when its literally the exact same job for the same price.
Rest of us- "You see, we dont have the SAME mods.."
The before and after graph of the headers are both to 8k. Not sure where you are talking about 7500. Unless your referencing the first pull we did with a stock tune that has the rev limiter set at 7500. When you have a rev limiter set to 7500, you obviously cannot pull the car past.....7500... But that was in part 1. Part 2 has the car going to 8k on both pulls. So you are seeing the results at the same rpm.Someone explain....the graph shows the first pull, obviously at less hp, up to 7500 rpm....and the second pull, obviously more hp, up to 8000 rpm. From all the dyno vids posted, and as has been reported by pbd, whom I trust, it has been shown that some guys report higher numbers just based off raising the rpm on the dyno pulls.
Would it make sense to ask what the hp reading was with at the same rpm. Not suggesting the headers didn't increase power but wondering if simply doing the pull to a higher rpm caused more of the hp gain that has been seen.
In the end, I think we all agree headers do give more hp...for those that want to drop the coin...which is me.