Dump pipe problems

[nizmokid]

Hi guys I just fitted a bigger dump pipe to my R33 and the dump has a split pipe on it, so on high boost the the car feels like the power hits then stops then hits again and stops like it is choaking or something any ideas on this problem!

standard boost is fine but highboost is running like a dog! this wasn't doing this before I placed the new dump pipe on the car.

any help with this problem would be great!

[Mcboost]

Hi guys I just fitted a bigger dump pipe to my R33 and the dump has a split pipe on it, so on high boost the the car feels like the power hits then stops then hits again and stops  like it is choaking or something any ideas on this problem!

standard boost is fine but highboost is running like a dog! this wasn't doing this before I placed the new dump pipe on the car.

 

any help with this problem would be great!

maybe your o2 sensor?? that would have been bolted into your old dump, maybe it got damaged during the move??

[Abo Bob]

Mine does the same thing. I didn't think about it being the split dump though. Hmmm. :waits for experts:

[raist60]

Cars dont give two shits about o2 at full load.

Id say now your flowing more your hitting the standard 4800-5000rpm ECU flatspot. ECU see's too much airflow gets a little worried and pulls the timing back pretty severly. If it is that then there is no way to fix short of putting a new ECU in.

[TTT]

**COUGH - re-gap your plugs to 0.8mm - COUGH**

[Abo Bob]

Mine are .8 with about 10k on them.

[nizmokid]

all ready done that might need some new plugs !

[meggala]

sounds like a boost cut issue

[WHITE R32]

i agree with meggs on this one....

[nizmokid]

went and seen a mechanic and he said it sounds like it is hitting a boost cut too, if so what can I do to get round it?

[blind_elk]

Sounds pretty much like compressor surge. The new dump pipe is allowing the engine to exhale lots of gas. As a result, it wants to inhale more air, but the turbo is inefficient at the (higher) boost levels you are running - on low boost, the turbo is still within its efficiency range.

[Sydneykid]

I agree with Meg, sounds like the usual R33 GTST boost cut, ECU ignition retard and fuel richen protection mapping.

[RBVS]

if you have standard ecu it will be boost cut. run less boost or remove the factory solenoid and replace with aftermarket control , bleed valve or ebc. If you have after market control you need to retune your boost curves.

[T0nyGTSt]

Funny how I don't have this problem...

T.

[Sydneykid]

Funny how I don't have this problem...

T.

Your mods list says Power FC, that's why.

[nizmokid]

I might have to retune the HKS Iv boost controler and set up the boost again from scratch.

[Abo Bob]

I don't know if I'm helping or hindering by posting in this thread but a mechanic thought mine was hitting boost cut but later said it wasn't. Dyno graph says it's not. Timing might be being pulled (my opinion) or I need a bigger intercooler (his opinion).

ps feel free to tell me shut up if I'm just confusing things.

[raist60]

I believe there are 2 seperate things that the 33 ECU does

1. Is when there is excessive airflow it retards the timing and increases fuel

2. When boost gets very high its causes an extremely violent ECU fuel cut that almost throws you through the front window when it hits

I believe in this case its no. 1 fixable as i said with an ecu

[PHaT MR30]

i believe you are running a wolf 3d nizmokid? or did you bin that?

[nizmokid]

Binned it was a heap of sh!t for a plug and play.