Hello,

What kind of boost figures are you getting on vRS? Please comment on my video.. is this normal?

http://img852.imageshack.us/i/25t.mp4/

Best regards

Edited 28 April, 201115 yr by Gonzaga

If it's remapped, yes, thats about right.

Standard should stay around 10 psi (0.7 BAR), and trail off as the revs rise. Remapped can go anywhere to 19 PSI (1.3 BAR), and again, trails off when the revs rise.

AFAIK, it's not uncommon to see the initial spike go over 20 psi.

Mine boosts to about 22psi!

You are running Shark stg2 though.

Wonder if the OP is stage 1 or 2?

mine goes to 15psi and sits there till the limiter most of the time, sometimes if the outside temp is hot it will drop off tho

TNX, well I was boosting with previous map 24,6 psi and after 3 days my valve seals leaked and kaput , in fact I was slower with that map.

I have a strange problem, sometimes after flooring it ECU pulls back the boost from 1bar to 0.6bar after 5300 rpm. I have bypassed N249 to eliminate that part of the system but the same thing is happening. I was thinking to replace the precat O2 sensor because there is nothing else to replace, everything is changed till now. The O2 sensor is old as the car (10years)... This car is really driving me crazy :(

Edited 29 April, 201115 yr by Gonzaga

did you lift on that run?

it sounded like you did in mid rpm?

Here is mine from when I had it done:

the green line that spikes is the crappy Upsolute map I got from CCCtech. that one you hit around 3k and you hit the windscreen lol.

No, the throttle paddle was pushed all the way. I didn`t lift my foot off the gas at any time during the run. This is a good video clip, I will post a clip where you can see clearly boost drop. I looks like ECU is closing throttle due to some problem but I can`t figure what is the cause :'(

OK,here is the clip; http://img25.imageshack.us/i/e62.mp4/

Watch the boost at 1min 13sec, it drops suddenly from app. 0.9-1bar to 0.6bar. wtf is this? I didn`t lift my foot of the throttle padle :S

mine runs 23psi 261bhp 305 torques real nice and my valve seals had to be done also..

There is no way a small turbo will ever be able to support that level of boost to anywhere near the red line....

A spike in the boost may give impressive (initial) figures but still make for a cr*p drive... i.e. 250bhp@3500rpm dropping to 130bhp by 6000rpm.

When the turbo gets close to its capability the map can retard the ignition - that's what looks like is happening in your video clip (1min, 13sec)... I'd say it's quite a lumpy map. Smoothness and progression is what is required!! NOT outright figures - as these with a KO3s turbo can be made very misleading!

Some of the best KO3s turbo'd vRS's are running around the 230bhp mark with a slightly lower initial boost level, but they can maintain it for longer making it a much smoother drive. I've added my old KO3s dyno power run for comparison - mine made a claimed 246bhp with quite minimal drop off until 5500/6000rpm.

Even my old IHI vf34 used to hit 21psi (335bhp) and drop to 16/17psi (280bhp) at 6000rpm... you need to go even bigger with the turbo to avoid this sort of boost drop off.

HTH

Steve

There is no way a small turbo will ever be able to support that level of boost to anywhere near the red line....

A spike in the boost may give impressive (initial) figures but still make for a cr*p drive... i.e. 250bhp@3500rpm dropping to 130bhp by 6000rpm.

When the turbo gets close to its capability the map can retard the ignition - that's what looks like is happening in your video clip (1min, 13sec)... I'd say it's quite a lumpy map. Smoothness and progression is what is required!! NOT outright figures - as these with a KO3s turbo can be made very misleading!

Some of the best KO3s turbo'd vRS's are running around the 230bhp mark with a slightly lower initial boost level, but they can maintain it for longer making it a much smoother drive. I've added my old KO3s dyno power run for comparison - mine made a claimed 246bhp with quite minimal drop off until 5500/6000rpm.

Even my old IHI vf34 used to hit 21psi (335bhp) and drop to 16/17psi (280bhp) at 6000rpm... you need to go even bigger with the turbo to avoid this sort of boost drop off.

HTH

Steve

Mine is a hybrid and yes it does it no prob....mine hit 23 and tails around 5900 to 18 and stays to the red line of 7000 mine was uped a bit...

Edited 29 April, 201115 yr by mountie66

Appears to be ok, allthough im on a shark stage 1 and mine peaks at 20psi and holds. Before on the standard map it boosted to 10psi then dropped to around 8psi after a second or two.

The car was on dyno, figures are disappointing; 186HP and 280Nm :'(

The car was on dyno, figures are disappointing; 186HP and 280Nm :'(

Wheel or flywheel HP/torque?

For those boost reading that is awful - sorry to say it!!

High boost reading don't directly result in high BHP...

I would suggest a conversation with JabbaSport or Shark Performance....

I'm sure one of them will be able to suggest what's best - or post a remapped ECU out to you.

Steve

When hot outside my k04 octy boosts up to 1.8bar (26 psi), but normally it's around 1.4-1.5 (20-21 psi).

When hot outside my k04 octy boosts up to 1.8bar (26 psi), but normally it's around 1.4-1.5 (20-21 psi).

That must be the only turbo powered car in the world that boosts higher with hot air...?? Surely you have got those figures the wrong way round?!

Steve

maybe its magic? lol

Wheel or flywheel HP/torque?

For those boost reading that is awful - sorry to say it!!

High boost reading don't directly result in high BHP...

I would suggest a conversation with JabbaSport or Shark Performance....

I'm sure one of them will be able to suggest what's best - or post a remapped ECU out to you.

Steve

That`s flywheel HP/torque. I will measure on another dyno on monday but I think the results will be practically the same :S

That`s flywheel HP/torque. I will measure on another dyno on monday but I think the results will be practically the same :S

Expect it to be lower at the wheels mate.

Steve

I was going to watch the video, but Chrome stopped me....

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I also use Chrome but everything is OK :wonder:

Today I have tested the car on another dyno and something is definitely wrong, it shows also 186hp if boost cuts off to 0.5-0.6bar but after a ECU reset the boost didn`t cut off and the results are 225hp and 350Nm. On the second run, the boost again dropped and the same s*** started to happen

I ordered a new MAP sensor but I am really running out of ideas...

Please help :'(

That must be the only turbo powered car in the world that boosts higher with hot air...?? Surely you have got those figures the wrong way round?!

Steve

Actually not, i DO have this behavior. I always thought it's normal, my line of thinking being that when it's hot the ecu demands more boost to keep performance the same. Was I totally wrong all along?

Actually not, i DO have this behavior. I always thought it's normal, my line of thinking being that when it's hot the ecu demands more boost to keep performance the same. Was I totally wrong all along?

Yep,

When intake temps are too high the ECU will retard the timing and reduce boost.

Steve