The largest Civic Type R club forum

[kipps]

Any experts out there who can kindly explain why my torque is all over the place compared to others nice smooth curves ??

[pulpmelon_r]

Might be some resonance effects peaking and troughing every 2k rpm, what kind of intake, intake manifold, header and exhasut are you using?

Also It been run in 4th so you have quite a short sample rate, plus I'm guessing at no smoothing correction on the graph itself.

[kipps]

what kind of intake, intake manifold, header and exhasut are you using?

Its currently got

RBC bord to 70mm
70mm TB
Gruppe M intake
Toda Header
Custom exhaust system (Which is slightly restrictive and will be changed soon)

[*nub*]

How is the custom exhaust restrictive ? Too small in diameter or is it bending and stuff ? I only wonder cause I have a custom 2.5 inch exhaust too

[kipps]

Diameter - I think its 2.36 inch (May even be a tad smaller)

Needs a 3inch exhaust [smilie=karls_thumb.gif]

[pulpmelon_r]

Who tuned it kipps?

It would be interesting to know how much cam and ignition advance is being used in the mid range as thats where you find your torque typically.

[SuperFLY]

Diameter - I think its 2.36 inch (May even be a tad smaller)

Needs a 3inch exhaust [smilie=karls_thumb.gif]

who told you that? seems a bit excessive unless you're running a turbo

[kipps]

Diameter - I think its 2.36 inch (May even be a tad smaller)

Needs a 3inch exhaust [smilie=karls_thumb.gif]

who told you that? seems a bit excessive unless you're running a turbo

No one told me in needed to be 3inch - But may as well go for a custom 3 inch titanium system, to ensure It can handle future engine mods, and save weight [smilie=karls_thumb.gif]

[Ernie96]

Diameter - I think its 2.36 inch (May even be a tad smaller)

Needs a 3inch exhaust [smilie=karls_thumb.gif]

who told you that? seems a bit excessive unless you're running a turbo

Its well documented all over the net that going 3" on K20 gains you power right through the rev range.... :bigthumb:

[::Adds::]

+1 I have 3 inch (penarse)

[integraleo]

+2 I gained 9bhp going to 3" system over the 2.5" system I had on my dc5.

[SuperFLY]

would have thought you'd be running into back pressure issues...

but ah well, live and learn..

9+ years on this site and you learn something new every day

[gearinator]

would have thought you'd be running into back pressure issues...

but ah well, live and learn..

9+ years on this site and you learn something new every day

I'm with you. 3 inch unless its supercharged or turbo will cause back pressure issues [smilie=karls_thumb.gif]

[::Adds::]

Significant difference from my old exhaust to my new 3" back pressure is a myth

[mickdj]

I thought it was only 2strokes what needed back pressure

[Ernie96]

Backpresure issues... this is a myth...

The manifold creates all the back presure you need ANYTHING after the header is just a restriction.

[*nub*]

I researched a bit on this years ago on k20 forums etc and I remember that there were a few dynos and tests with direct comparisions etc proving some gains over 2.5" on the k20. also that back pressure is nonsense and irrelevant. this was when I bought my 2.75" GReddy cat back, however I had to switch back to 2.5" as the thing was too damn low when lowered 30mm. the difference from a 2.75" to 3 inch has gotta be insignificant and neglible though surely if you're only talking up to 250bhp NA.

[Liam Type-R]

I have a 4" system. same as most tailpipes.

[::Adds::]

I researched a bit on this years ago on k20 forums etc and I remember that there were a few dynos and tests with direct comparisions etc proving some gains over 2.5" on the k20. also that back pressure is nonsense and irrelevant. this was when I bought my 2.75" GReddy cat back, however I had to switch back to 2.5" as the thing was too damn low when lowered 30mm. the difference from a 2.75" to 3 inch has gotta be insignificant and neglible though surely if you're only talking up to 250bhp NA.

When you compare from 40-160 it does make a difference along with bigger figures to wave your willy over if that's your thing.. :salut:

[TDi-North]

Might be some resonance effects peaking and troughing every 2k rpm, what kind of intake, intake manifold, header and exhasut are you using?

Also It been run in 4th so you have quite a short sample rate, plus I'm guessing at no smoothing correction on the graph itself.

It's because it's not been mapped properly on low cam.
Copy and paste maps still being used with little understanding of how they actually work!

High cam is normally ok as that is all the "source" of these used to concentrate on. Low cam you normally see pretty much a straight line at 140ftlb until vtec. Car would feel lethargic until vtec with map you have.

Bring it in and I will tune it properly on one of my own.ECUs then we put yours in and compare them. You will see significant improvements when done properly.
If gains aren't there you don't pay. If I do make gains and you want to keep the map you pay.