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§ileightĄ
  • §ileightĄ
  • Standard User
  • Contributing Member!
  • Member No.: 1,118
  • Joined: 3-January 03
  • Posts: 340
  • From: Sth Brisbane
Post #1 post 24th February 2003 - 04:33 AM
I have recently built a new dump pipe /w screamer on my 180SX. The only other mods to the car are a full 3" exhaust and a cold air setup. Nothing else is touched including the boost



The problem I'm having now is if I have the car in say 2nd (for this example) and have the throttle at about 3/4 open just before the wastegate opens the car starts to stutter just as if I were on the rev limitter but this happens at about 4500rpm and will contine to do this but if I floor it the rest of the way the wastegate opens and all is back to normal untill the next gear. Its running fine otherwise.



I'm guessing this is a boost cut from the ECU and even though I haven't touched the boost the fact the exhaust is more free flowing now espically with the new dump pipe that it may be making enough extra boost to set of the boost cut.

Also its an auto and I know that soarers are known to do this same thing before shifting to protect the gearbox....



I'm not too concerned but was just seeing if anyone had any suggestions or has had the same problem. And please only genuine suggestions if you have no idea don't bother.



Thanx peoples

--------------------
1997 WGNC34 Stagea RS4 (No my Avatar is not my car but bloody close to it, lost my Pics)

Sitting in room waiting: FMIC, Full Nismo Kit, Boost Controller, blah blah blah.
WANTED: APEXI SITC....PLEASE PM ME IF YOU HAVE ONE, KNOW OF ONE FOR SALE ANYWHERE etc....

Josh
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Bimmin
Post #2

i have no idea

Hoon
Post #3

God your a dumbass Bimmin. I'd delete your nonhelping post, but I don't have access.



Josh: I'd get someone to check that computer of yours! Also, check your spark plugs and leads.

V8 Dave
Post #4

hmm correct me if i'm wrong... but dont u get a natural boost increase when u increase air flow and exhaust flow... i'm sure i've read that in zoom many times... where simple flow upgrades = boost upgrade... therefore u might find you are getting more boost than before into the manifold and its seeing there is excess boost so it vents via the wastegate...

resin
Post #5

you do get a boost increase on some cars when a better exhaust is put on, but I can't see it hitting boost cut with just an exhaust on there. A boost guage might help you.

DODGI
Post #6

boost cut on those cars is not so much a psi reading as a volumetric airflow reading, i.e if the airflow exceeds a preset level the computer will interrupt the party(usually around 13-15psi on these cars but can vary), you'll probably find that this is your problem due to the car breathing better & you need a computer mod or mods to your afm/map sensor signals to fix this.....

§ileightĄ
Post #7

QUOTE
boost cut on those cars is not so much a psi reading as a volumetric airflow reading, i.e if the airflow exceeds a preset level the computer will interrupt the party(usually around 13-15psi on these cars but can vary), you'll probably find that this is your problem due to the car breathing better & you need a computer mod or mods to your afm/map sensor signals to fix this.....




That right and I think that goes for most nissans from what I've read. Thanks for everyones ideas and I'd pretty much come to the same conclusion....I would like to stay away from a FCD if possible and I do need to get off my ass and get a boost guage :wink: But its not really bothering me atm

Hoon
Post #8

That John fella is selling a Autometer one for $100. Hopefully that includes all fittings, hose and maybe a cup. Just a suggestion. PS: Get off your ass! laugh.gif

§ileightĄ
Post #9

Well with the Dyno Day comming up I have some engouragement tongue.gif

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