Collector Length

wolfe67

Active Member
Aug 3, 2014
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Just curious what length collectors people are using off their long tube headers. I had mine at 18 inches but did the old paint trick an cut them where the paint changed colors an cut off about 7inches an I lost a tenth in the quarter, I know it dont sound like much but every tenth helps when your drag racing.
 
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I'm not sure that you can contribute that big of a loss just to the length of the collector. Unless the DA was identical with the same temp and humidity along with track prep etc your test results could be erroneous. I would be more curious to see the hp loss or gain on a dyno where your results can be repeatable. In my opinion, until you get way up the food chain in heads up racing, collector length will make a very minimal difference in performance.
 
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I'm not sure that you can contribute that big of a loss just to the length of the collector. Unless the DA was identical with the same temp and humidity along with track prep etc your test results could be erroneous. I would be more curious to see the hp loss or gain on a dyno where your results can be repeatable. In my opinion, until you get way up the food chain in heads up racing, collector length will make a very minimal difference in performance.
I watched a pretty interesting video where they did around 6dyno runs with collectorlenghts starting at 18" down to 10" and i was pretty amazed with how much torque n hp you actually lose the shorter they cut the collector. Looks like a18" length is the magic nunber as far as the most torque n hp. So im gona do my own testing this wkend an make 2 passes with the 10s I have on now than put a set of 18"s on an see if I get any results.
 

Well
Sounds good, Please post your results! Curious to see how back to back testing works out for you.

I finally got to the track tonight an i was happy with the results. With the 10 inch collectors i ran a 10.54 an a 10.56
Now with the 18 inch collectors i ran a 10.44 an a 10 42 60fts went from 1.57 n 1.55 w/ 10 inch collectors to 1.49 an 1.47 so the longer collectors their was an improvement.
 
Was this hot lapped too? I mean considering how long it took to replace the collectors or did you do two set of cold runs?
No hot laps. Made a pass and had to wait till my lane was up to run again. So their was probably half hr between runs. Im pretty sure the longer pipes are givin me more torque off the line. My front end was coming off the ground about a foot, according to what I was told by friends watching. So over all It looks to me the longer collectors work better.
 
Best way to get results is next time you go out start with the 18" and then do the 10" just invade having that engine warmed up made a difference that way you will have good accurate data to go off of. :) Just figured id throw that in there to help you out. Wish I could go 10.xx down the track
 
Best way to get results is next time you go out start with the 18" and then do the 10" just invade having that engine warmed up made a difference that way you will have good accurate data to go off of. :) Just figured id throw that in there to help you out. Wish I could go 10.xx down the track
Best way to get results is next time you go out start with the 18" and then do the 10" just invade having that engine warmed up made a difference that way you will have good accurate data to go off of. :) Just figured id throw that in there to help you out. Wish I could go 10.xx down the track
Best way to get results is next time you go out start with the 18" and then do the 10" just invade having that engine warmed up made a difference that way you will have good accurate data to go off of. :) Just figured id throw that in there to help you out. Wish I could go 10.xx down the track
 
Sweet definitely let me know how it goes man if the numbers stay the same I'll be sold on length of collectors
Sweet definitely let me know how it goes man if the numbers stay the same I'll be sold on length of collectors
Ok. Both my cousins are going to be tryingthe samething tomoro. They had thesame length as i had on so after they seen my results now their gona see if the 18's work in their car as well. Shud be able to post results after the race tomorrow
 
MikeH6 post: 8861631 said:
Yeah let me know
Well I ran my fastest passes ever today. I ran back to back passes an ran 10.341 an 10.352 @ 130.87 mph. My 60fts wer the best ever also 1.460 so I know them longer collectors made a difference.
 
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