Stagea Sluggish Below 5500-6000 Rpm

[SafT]

A friend of mine has a S1 RS4.

Basically the problem is as i have attempted to describe it in the title.

I have:

Wired the boost solenoid to earth (holds ~8psi)

Changed the plugs (to bcpr6es from memory) - all the old plugs looked pretty consistant in colour

Cleaned the AFM

Unrelated but i have changed the O2 sensor as well.

This issue has existed since he bought the car - im sure its not supposed to be like that.

Knock sensor issue?

Any other suggestions?

[R31Nismoid]

so stock otherwise?

probably just how it is, restrictive 10yr old+ ehaust. Cat might have collapsed a bit etc

[SafT]

so stock otherwise?

probably just how it is, restrictive 10yr old+ ehaust. Cat might have collapsed a bit etc

gutted the cat after i posted that last night - no change

the symptoms are the opposite to what i would expect for a restriction

[Tangles]

common problem

good choice of sparkies, but use industrial strength silicon sealant all around the coilpacks to stop wasted spark.

get bleed valve and set to 10psi

get turbo to cat dump pipe, 3" bellmouth, for $220, and a catback system (muffler and pipe for $300)

get panel air filter such as Pipercross, K&N etc (same as vr/vs commodore)

get safc, wire it in, change all fluids, and get it dynoed

should feel MUCH better, have better fuel economy (should), and more power

not too expensive, a grand and she'll be running smooth with around 140awkw

[SafT]

Having driven a few RB25DE 4wd stageas - this doesnt appear to go much better than one below 5500 rpm.

Even running roughly the same speed up a long hill. (same speed as a diesel st-x navara)

Will check ignition timing next i guess

it just has a basic paper filter at the moment (new)

[TTT]

187kw and 1700kg and auto will be slow no matter how you look at it.

so it feels fast for the last 1000rpm of it's stock rev range?

[chrissso]

My 33 was sluggish below 4500, put it down to stock ECU didn't like the increased boost...

[R31Nismoid]

Suppose with the added weight the ECU might be fritzing out earlier perhaps

Which would be the good ole stock ECU + increased boost scenario

[Tangles]

187kw and 1700kg and auto will be slow no matter how you look at it.

lol

come for a spin in mine then..... whistles "this old girl she aint what she used to be, she aint what she used to be...."

[Sydneykid]

Mine always had more go at 3,000 rpm than 6,000 rpm, even when standard with 100 rwkw. Removing the 2 stage boost improved the 3,000 rpm performance much more than it did the 6,000 rpm performance. After many mods and double the power output it still pulls a whole lot harder at 3,000 rpm than it does at 6,000 rpm. When does yours develop the 8 psi? It should be 2,000 rpm. If not then you have a restriction somewhere, exhaust perhaps. My next guess would be ignition timing, so my suggestion for that would be to get a timing light and check it. Then check the camshaft timing. After that it is a leak down test to make sure the internals are OK, although if it doesn't use any oil then that is unlikely.

Cheers

Gary

[SafT]

Mine always had more go at 3,000 rpm than 6,000 rpm, even when standard with 100 rwkw. Removing the 2 stage boost improved the 3,000 rpm performance much more than it did the 6,000 rpm performance. After many mods and double the power output it still pulls a whole lot harder at 3,000 rpm than it does at 6,000 rpm. When does yours develop the 8 psi? It should be 2,000 rpm. If not then you have a restriction somewhere, exhaust perhaps. My next guess would be ignition timing, so my suggestion for that would be to get a timing light and check it. Then check the camshaft timing. After that it is a leak down test to make sure the internals are OK, although if it doesn't use any oil then that is unlikely.

Cheers

Gary

I never double checked the boost at low rpms.

checked it around 3500 and it made 8psi no problems there

Next time he comes around i guess i will have to do get the timing light and compression tester out.

And for the suggestion from some about raising boost to 10psi - I'm hesitant to wind more boost into it while it doesn't feel like its responding well to what it has.

How do you rate the GCG turbo Gary?