Side exit exhaust (boost creep)

S

Superduck

New Member
HI there,

I am looking to fit a 3" side exit exhaust ou the bumper, my reasons for this is to
  1. potentionally save weight
  2. to remove the bulged in the floor
  3. cost (againist a full system)

My concern is boost creep, i 1st came across this after fitting a 3" down pipe and fully system to my evo1.

Does any one know if this will happen to teh GTIR after fitting the side exit?
Would i then need to get a mappable ecu and new map etc?
What size of bore would stop it or what size should i fit etc?

Cheers Craig

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S

Superduck

New Member
Apologies for spelling, i like to type fast and my big fingers get in the way, i should just take a min to spell check lol.......
 
vpulsar

vpulsar

Well-Known Member
What on earth do you want a side exit exhaust for, It will be very loud you'll be stopped by the police constantly and you wont get on any track day end of story.

But a few people have run them in the past with out problem running wise I believe.
 
S

Superduck

New Member
Just a track car.

I mentioned my reasons in op, mainly to get a seat fitted low, it's cheaper and saves a bit of weight.

Can fit an bung to silence it slightly.

As the back pressure will change I wasn't sure about boost creep.

So you think after its fitted I will not have to get it mapped or change boost settings, I have it at 1bar at the moment?
 
PobodY

PobodY

Moderators
Staff member
Seems like a lot of effort to cut a section of the floor out when you still have the tunnel for the prop shaft. - If you don't have a catalytic converter you may find your exhaust doesn't interfere anyway.
The couple of people I know had a front-exit have put it back to a rear-exit now.

I'm not sure about how useful the weight saving is; all the weight is at the front already.

Ultimately potential creep issue could probably be resolved with a stronger wastegate spring. - I'd start there if you're having problems with your new exhaust.
 
S

Superduck

New Member
Pobody, thanks for that.

Tbh the side exit is not really no cup of tea, I was just thinking it would save a few issues etc.

You are right it's only the where the cat used to be that I need to cut out.

Think I'll just get full system made.

Cheers
 
PobodY

PobodY

Moderators
Staff member
Ultimately it's your car, do what you like. - I think Rob has a point about it getting harder to pass the noise regs these days, but you can put a big muffler in a front-exit and take some of the noise out.

It is less restrictive, and I think if you were building a car for the drag strip it would make more sense.

I'm no expert, but I think having so much weight at the front is one of the reasons the car tends to understeer by default.
 
warpspeed

warpspeed

Well-Known Member
The car will likely only be on track at Knockhill whose noise regs aren't a prob as its in the middle of naewhere and the car won't be on the road.....

The plan was to get the drivers seat down to a decent height so that was the thinking behind the front exit and overall there would be weight savings, I know its not ideal having a big silencer at the front....
 
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