Overboosting - Max Settings / Bar

[Guest alan3579]

Hiya,

 

I have a 96, UK spec TT, Fitted with Full decat, Blitz dsbc, induction kit, Iridium plugs, Upgraded smic, and some pipework.

 

I have my dsbc set for around 1.2 bar of boost, and on occasion, usually on a cold morning, the boost can rocket up to 1.25 and I have seen 1.35 on it.

 

So my questions are:

 

1. Is over 1.2 bar. i.e 1.35 / 1.4 bar to much for stock internals, fuelling and cooling?

2. Does the cold affect the pressure produced by the turbo increase in cold weather?

 

Cheers

[Nic]

Cool air = denser air = more oxygen = bigger bang = higher boost.

 

1.4bar may be okay on the UK turbos, but not sure about the fueling and exhaust gas temps. Personally I'd turn the boost controller down so it is peaking at 1.2bar again to be on the safe side.

[TonytotheB]

Can you reduce duty cycle? I am not sure how that boost controller works but as mentioned, lower it just to be safe. Or avoid boosting in early morning conditions before the day has warmed up. Maybe if you can have programmes you can alter to low and high boost, depending on weather conditions. I have the AVCR and can do exactly that

[Guest alan3579]

Can you reduce duty cycle? I am not sure how that boost controller works but as mentioned, lower it just to be safe. Or avoid boosting in early morning conditions before the day has warmed up. Maybe if you can have programmes you can alter to low and high boost, depending on weather conditions. I have the AVCR and can do exactly that

 

I have 4 different settings at the moment, I only use 1, which is for cold and 4 which is for warm.

 

Just wondering if 1.4 bar is gonna do any damage.

[nigelboyne]

I have 4 different settings at the moment, I only use 1, which is for cold and 4 which is for warm.

 

Just wondering if 1.4 bar is gonna do any damage.

 

uk turbos are fine up to 1.4 bar mine on occasion using toulene/xylene i have seen as high as 1.7bar to high. but on high setting in the colder weather i often see 1.5 bar in the higher gears 4th 5th

[dr_jekyll]

im having a similar prob with the cold air and overboost. im getting knock so i think the car is goin to bed until the weather warms up, that and the fact that the wheels just spin

[Nic]

uk turbos are fine up to 1.4 bar mine on occasion using toulene/xylene i have seen as high as 1.7bar to high. but on high setting in the colder weather i often see 1.5 bar in the higher gears 4th 5th

 

Is the fueling and the exhaust gas temps okay at those pressures?

[monsween]

As mentioned the turbo's "should" be good for 1.4bar but i'd still keep it at 1.2bar. As Nic mentioned check your EGT's and AFR's

[Guest alan3579]

Thanks for the responses

[nigelboyne]

Is the fueling and the exhaust gas temps okay at those pressures?

 

i have no idea mate the fcon i thought looks after all this,i have no gauges want to keep stock look inside not hot on the idea of gauges