How much boost do you run..?

[AndysR]

As requested by Merc85.....

How much boost do you run and is that with or without a dump valve?

[t5_monkey]

17 psi with a forge recirc

[AndysR]

I run 20.5 psi without a dump valve, recirc or atmospheric.

[t5 pete]

1.25 bar with forge dv

[LiamT4]

Not much! lol

No dumpvalve, not really a fan, i prefer the more natural noise of an induction kit.

13psi although i'v been told it should be running 16-17psi.

[merc85]

Have been Runing/trying to run Standard recirc valves at 17psi keep blowing holes/not holding boost etc Doh

Was also runing a Bailey DV26, Never again lol

[leet5r]

not enough lol , what ever you want really , ran a bar for over 2 yrs no probs , on me 3rd turbo tho lol , seen some evos run 55psi

[merc85]

not enough lol , what ever you want really , ran a bar for over 2 yrs no probs , on me 3rd turbo tho lol , seen some evos run 55psi

pmsl, 3rd turbo, i'm on me 3rd recirc lol Turbo next pmsl

[WOODY T5]

1-3 to 1-45 bar here.hks dump

[merc85]

1-3 to 1-45 bar here.

Dv?

[glock19]

1.4 bars, Recirc, but tougher spring inside. Internal wastegate (19T) adjusted against creep only.

[jardon]

21 psi with the stock BCS, Forge 1 bar actuator and standard recirc.

The standard recirc is not a problem for anything a stock turbo can throw at it so not worth "upgrading". They can fail though so worth investigating if losing boost. Bear in mind that all the stock turbos will fade if pushed above stock boost - my 19t will hold 21 psi up to 5000 rpm but drops to 17 psi at 6000 and 16 at 7500 rpm. They saturate quickly due to the small turbine. None of them will hold high boost to high rpm even if fitted with a big compressor wheel - big mid range torque is their forte. I have never had a true boost leak but did blow out the IAT sensor and the top charge pipe once. What does your boost do at WOT Merc?

[merc85]

21 psi with the stock BCS, Forge 1 bar actuator and standard recirc.

The standard recirc is not a problem for anything a stock turbo can throw at it so not worth "upgrading". They can fail though so worth investigating if losing boost. Bear in mind that all the stock turbos will fade if pushed above stock boost - my 19t will hold 21 psi up to 5000 rpm but drops to 17 psi at 6000 and 16 at 7500 rpm. They saturate quickly due to the small turbine. None of them will hold high boost to high rpm even if fitted with a big compressor wheel - big mid range torque is their forte. I have never had a true boost leak but did blow out the IAT sensor and the top charge pipe once. What does your boost do at WOT Merc?

Boost's 18psi Drops harshly down to 15.5 psi. Have tested the Recirc with a vac pump, and it does not hold Boost.

[jardon]

Boost's 18psi Drops harshly down to 15.5 psi. Have tested the Recirc with a vac pump, and it does not hold Boost.

How are you controlling boost? I'm out of depth on MBC's etc but unless the reciec valve is visibly faulty I would say the fault lies elsewhere.

[mitchyboy01]

My T4 runs 22psi from remap previous owner did. In for Walbro today so hopefully the stuttering issue will be sorted!!

[merc85]

How are you controlling boost? I'm out of depth on MBC's etc but unless the reciec valve is visibly faulty I would say the fault lies elsewhere.

The Boost is controlled with the MBC, The recirc has been vac tested, and has proved faulty, as it does not hold any Vac.

[smithson007]

1.25 bar with forge dv

Same Here!

[BlackBeast]

25psi to 7500rpm, but it does tend to overboost to 28psi when the temps are low. Thats with a Forge 004 dump valve and 1bar actuator.

[Jim S70R]

Running 1.2 bar

[JelT5]

Zero at the moment because my engine went pop lol

Usually around 1.2-1.4 bar when it's working :)

[JT]

1.3 bar
as per the PR8 racing regulations:(

[claymore]

26psi at prescott a couple of weeks ago, but turned back down to 20psi now

[Volvostorm]

No idea yet, but I know it can run upto 2bar (29psi) without stress, possible even 2.2bar

[Ade]

A Rica mapped ECU which sent it to the top of the gauge on the dash! :lol: Whatever that is?
Just on a standard turbo and a Bailey DV26, (which I'll be chucking soon probably!).

[gmain1967]

18 psi on a T4. But that is with a 19T.......:wink:

[t5_monkey]

Wish I had a 1.6 Drive... S40.. then I could say 36 PSI :o



18 psi on a T4. But that is with a 19T.......:wink:


Yeah but that's like 180psi on the regular turbo :tank:

There's a pistonheads run this Sunday fancy embarassing a few porsches ?

[gmain1967]

Wish I had a 1.6 Drive... S40.. then I could say 36 PSI :o





Yeah but that's like 180psi on the regular turbo :tank:

There's a pistonheads run this Sunday fancy embarassing a few porsches ?

LOL - nice idea but too much on this weekend and back to work Monday after two weeks off. Been anything but a holiday:(

[danny-R]

1.5 bar with dv before it ££££ itself lol

[theflyingbrick]

peaks at 20 psi but drops right down to about 13 saying that the clutch started slipping quite a bit so when thats fixed if it still does it ill investigate the actuator!!

[merc85]

Sounds like a Boost leak somewhere, Keep us posted.

I take it your runing a blanking plate with ur dv.

Full stage zero tune is a must, helps in the long run.

[8501970]

no idea yet, but i know it can run upto 2bar (29psi) without stress, possible even 2.2bar

2.2 bar !!!!!!!!!!!!!

[theflyingbrick]

Sounds like a Boost leak somewhere, Keep us posted.

I take it your runing a blanking plate with ur dv.

Full stage zero tune is a must, helps in the long run.

yeah mate blanking plate and dv i think its the clutch where the engine was just revving and not revolving is why it dropped so much but we will see ;)

[frobes2]

1.2 bar with a Forge blanking plate and no dump valve.

Scott..

[swedenpower]

14 psi with Standard recirc

[smithy]

2.2 bar !!!!!!!!!!!!!

2.2 bar thats childs play mine is rated at pushing 2.5 bar scary lol

[merc85]

These Boost figures is it the maximum the car wll run all day long or just a quick burst?

Tyring to find out weather ive a problem or not.

I can boost 20psi but after sustained 15sec's she drops to 15psi? i am running a auto ecu in a manual, could this be the problem?

[glock19]

Tyring to find out weather ive a problem or not.

I can boost 20psi but after sustained 15sec's she drops to 15psi? i am running a auto ecu in a manual, could this be the problem?

On 5th gear for 15 Secs ?
The Auto ECU is not the culprit, it could be the mapping where the load indeces is lower and thus lower boost. If this has never happended before, check your MAF sensor

[jardon]

These Boost figures is it the maximum the car wll run all day long or just a quick burst?

Tyring to find out weather ive a problem or not.

I can boost 20psi but after sustained 15sec's she drops to 15psi? i am running a auto ecu in a manual, could this be the problem?

Stock frame turbos will support ~1.0 bar above 6000rpm. If you are running 20 psi peak and it drops off at ~5000rpm then this is because the turbo is out of puff. You could nail the wastegate shut and it would still fade. My stage 1 tunes on the 16t all ran peak 18-19 psi but dropped off to 12 psi at 7000 rpm. My 19t runs a peak of 1.4 bar and drops to just over a bar at 7500 rpm. This may explain what you are seeing on the gauge - could you do a 4th gear pull from 2000 rpm (or whatever is deemed safe for you rods) to 6000 rpm and get back to us with your boost at 1000 rpm intervals?

[merc85]

I'm beging to think it's my 15g turbo runing out of puff. If it was a Boost leak it would imediatly drop dont you think,

At the moment she will hold a 18psi until around 4,300 rpm then the boost tails off to a 1 Bar aprox 14.8psi

I Will try and do a run with a friend so he can look at the gauges.

Thanks again for your sugestions

[jardon]

That sounds ballpark normal to me and I suspect you haven't got a boost leak. Any other 15g users have a profile of their boost?

[Wobbly Dave]

1.25 bar with 19T

[850 t5 vs 600cc]

I'm not running as i sold mine last year. on the look out for another volvo to abuse . Mine did run at .9 bar.