Thread: Triy bigtube vs regular tube

Instead of reffering to headers as small tube and big tube can we actually have tube diameters and steps to make sense of what the headers are actually doing?

Major restriction in that 88mm motor to have that large of a nosedive in the upper RPM.

yes. bore and stroke ratio affect tq

and the peak tq is not what i am looking @, i am looking at how flat the curve is which is very good

peace

What do you by nosedive It's becuase I'm taking it to 9100 or 9300 It's my tuner that like to go that high

There its no restriction!! That its called not tuned timing map!!!! Also he doesn't have TC He doesn't tune the timing map I can bet for sure timing its over advanced past the power peak that's why it fall so bad!! And that's why peak torque its low!!! I can show you a graph of the cars Pito and I tune you can see the difference!!
That motor still have some power to unleash but when decides to tune the timing map!!!

Its really not that bad of a nosedive. Its just because the way the graph is sized and zoomed in. Look at where the the graph has its points at and you will see what i mean. The dot at roughly 207whp is still lower than the where the "dip" ends at at the end of the revs. So 237 peak and probably still making 210-215whp by the rev limit. Thats not that bad of a dip. A better picture of the graph would illustrate this better.

jamie these are specs off ebay, but i have the specs of mine at the garage so i'll confirm the big tube sizes in the next couple of days

so the small tube is listed at
Primary = 42.3mm to 44.3mm to 47.8mm
4-2 collector = 47.8mm
2-1 collector = 50.8mm
Outlet = 65mm

and the big tube is
Primary = 44.5mm to 46.4mm to 47.8mm
4-2 collector = 50.8mm
2-1 collector = 54mm
outlet = 65mm

Their you go the size of the headers

So N1's and that intake manifold are not a restriction in the upper RPM's?

If you think that is tuning then more power to you.

I'll keep quiet from now on.

Yes they are!! but I was making a point that he could fix the nose dive on the graph tuning the timing map with TC so he can tune after 8000 rpm!! If I show you some graphs you will understand what I am trying to point out not that there its no restriction!!

Yes It's true I'm still tunning only up to 8000 and I'm using a apexi neo for the fuel map ..so ithink It's time to fix that