My dumptube goes into my downpipe at a horrible 90 degree angle. But I already forked out the $200 to get it tuned. Now I want to run an open dumptube and I'm wondering whether this will affect the tune. I dont want to spend another $200 just for a few horses of an open tube if I'll need a retune. If I'll need a retune then I'm just going to get the angle fixed at a muffler. Although I would rather have it open. So do I need a retune if I go from recirculated to open?


Modified by South Bay Surfer at 3:02 PM 6/22/2008

 

it would be a good idea

$200 is better than buying a new motor

 

https://honda-tech.com/zerothread?id=1232885

In this thread, the general consensus was that when going from open to closed a retune wasn't needed. But how about the opposite--going from closed to open? Is a retune needed. Any other opinions? Any help is appreciated.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tannerLSt &raquo;</TD></TR><TR><TD CLASS="quote">it would be a good idea

$200 is better than buying a new motor</TD></TR></TABLE>

What is your thought process behind this?

 

Unless your car was tuned on the absolute edge AFRs wise, I doubt you will need a retune.

Nevertheless, wouldn't hurt to check. Car might need a bit more fuel through boost, it'll be marginal at best though.

Whatever you do, make sure the tube vents in a place the turbo can't breath it in.

 

Cool thanks. Before I do anything though I'll give my tuner a call and go from there. But I'm leaning towards opening it up pending his approval. There no way I'm spending another $200 when i just got it tuned a couple of days ago and for only a few horses.

 

Done it a bunch. No, retuning isn't necessary, but your boost controller may need a little adjustment, since there will no longer be any backpressure issues that you previously had with the closed system.

 

I'm actually not using a boost controller. It's boosting off the wastgate spring at 9psi.

 

Here is a pick of the horrible angle of the dumptube going into the downpipe. It's not quite 90 degrees but its close--between 60 and 70 degrees. What are your opinions? Should I be comcerned or should I just leave it alone. As it stands it's making 206 whp.
[IMG][/IMG]

 

any opinions on the pic?

 

pic is up

 

I cant see any 90 degree angle in that pic, get one from under the car

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by South Bay Surfer &raquo;</TD></TR><TR><TD CLASS="quote"> It's not quite 90 degrees but its close--between 60 and 70 degrees. </TD></TR></TABLE>

I was considering going from open to closed, but not gonna do it now since I read that other thread you posted.

 

just monitor your afr if you can.
but since you have no boost controller your fine since your wastegate will open at 9 anyways and i dont see much need for a retune since your not going to boost higher?

 

If you have a AFR with wideband I would just watch it. I would imagine you shouldn't have any problem opening it up. I can't really see it leaning you out enough to cause any probelms.