Maximum allowable boost on the VNT1749VA

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Maximum allowable boost on the VNT1749VA

Post by AshTDi »

Hi guys :hi:

What's the maximum "safe" level that i can increase the boost on my turbo? I'm currently running at 1.58 bar. Would 1.8 bar be too much?

All advice and suggestions welcome :smile:
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Re: Maximum allowable boost on the VNT1749VA

Post by Sparkz0629 »

Hey budd,

I don't see why not...

Trevors mad maps go close to 2 bar...

Mine was at 1.8-1.9 bar, and no issues... touch wood...
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Re: Maximum allowable boost on the VNT1749VA

Post by Deranged_9n3 »

Marco is running a 2bar map , I am on a 1.6 bar map :oops: but most of the guys seem to be running 1.8 bar maps :hi:

Nice mod list you got there !! I assume with FMIC 1.8bar is pretty safe
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Re: Maximum allowable boost on the VNT1749VA

Post by AshTDi »

:hi: Sparkz i reckon your cabby must be running like a bat outta hell with that kind of boost :crazy:

Cheers 1FlyTDI :hi: 2 bar! damn! I'm speechless :fear:
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Re: Maximum allowable boost on the VNT1749VA

Post by Sparkz0629 »

AshTDi wrote::hi: Sparkz i reckon your cabby must be running like a bat outta hell with that kind of boost :crazy:

Cheers 1FlyTDI :hi: 2 bar! damn! I'm speechless :fear:
Lols, my ex cabby... :cry:

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Re: Maximum allowable boost on the VNT1749VA

Post by MeanTdi »

Max requested is around 1.6 - 1.7. The boost spikes to 1.9 - 2.0 at the JHB...

..but depends on how you drive. I warm up, cool down, treat with ''mechanical sympathy'' and only use max boost sometimes.
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Re: Maximum allowable boost on the VNT1749VA

Post by AshTDi »

MeanTdi wrote:Max requested is around 1.6 - 1.7. The boost spikes to 1.9 - 2.0 at the JHB...

..but depends on how you drive. I warm up, cool down, treat with ''mechanical sympathy'' and only use max boost sometimes.
Hi bud :hi:

I'm leaning towards a boost of 1.8 bar, would you recommend it? I do allow for warm up and cool down and only sometimes do i hammer the car
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Re: Maximum allowable boost on the VNT1749VA

Post by Neuk »

My old Polo, Betty use to run daily at 1.8 - 1.9 bar without issues but like Marco I have a lot of mechanical sympathy for all my cars...
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Re: Maximum allowable boost on the VNT1749VA

Post by Deranged_9n3 »

I would recomend 1.8 bar seeing as you have FMIC + DP + FreeFlow !!

A turbo can pack up at anytime as turbo life cannot be estimated
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Re: Maximum allowable boost on the VNT1749VA

Post by AshTDi »

Great! it's settled! 1.8 Bar it is!! :hurray: :hurray: :hurray: I can't wait! Will upload the results as soon as i get them :grin:
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Re: Maximum allowable boost on the VNT1749VA

Post by Dirty Harry »

Neuk wrote:My old Polo, Betty use to run daily at 1.8 - 1.9 bar without issues but like Marco I have a lot of mechanical sympathy for all my cars...
Your cars drive in granny mode all the time...they constantly live in sympathy :lol:
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Re: Maximum allowable boost on the VNT1749VA

Post by SoDub »

Mine is at 1.6 bar and when we logged it, it spikes to 1.9 at night when it is cooler.
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Re: Maximum allowable boost on the VNT1749VA

Post by AshTDi »

veedubbed wrote:Mine is at 1.6 bar and when we logged it, it spikes to 1.9 at night when it is cooler.
Geez! Spikes at 1.9 :fear: So i guess there's no way to "cap" it. So if i were to go 1.8 then my spike may be 2.0 :crazy: I fear for the turbo in that case :shock:
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Re: Maximum allowable boost on the VNT1749VA

Post by Crawler »

LOL no need to fear, Marco's knows how much mine spikes, I can not recall, but even more than ^^^
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Re: Maximum allowable boost on the VNT1749VA

Post by AshTDi »

crawler wrote:LOL no need to fear, Marco's knows how much mine spikes, I can not recall, but even more than ^^^
yasis! Crawler :hi: What's your boost currently set at and for how long? :smile:
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Re: Maximum allowable boost on the VNT1749VA

Post by SoDub »

crawler I think yours was pushing 2.1 bar - It spiked even more than marco's!!! Ash it only spikes for a split second though and in quite cool conditions.
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Re: Maximum allowable boost on the VNT1749VA

Post by Neuk »

AshTDi wrote:So i guess there's no way to "cap" it. So if i were to go 1.8 then my spike may be 2.0 :crazy:
The VNT system will control boost level and when a spike is detected will adjust to reduce the spike and bring boost to a more acceptable level...
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Re: Maximum allowable boost on the VNT1749VA

Post by AshTDi »

veedubbed wrote:crawler I think yours was pushing 2.1 bar - It spiked even more than marco's!!! Ash it only spikes for a split second though and in quite cool conditions.
Thanks for the reassurance Vee :hi:

It seems that quite a few guys have their boost turned up way past 1.8 bar. This gives me comfort in knowing that I can now have my boost at 1.8 and without worries of having my turbo go on permanent vacation :grin:
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Re: Maximum allowable boost on the VNT1749VA

Post by MeanTdi »

AshTDi wrote:Great! it's settled! 1.8 Bar it is!! :hurray: :hurray: :hurray: I can't wait! Will upload the results as soon as i get them :grin:
:fear: 1.8 bar spike yes, not requested. If you request 1.8 it will reach over 2.1 bar.
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Re: Maximum allowable boost on the VNT1749VA

Post by AshTDi »

MeanTdi wrote:
AshTDi wrote:Great! it's settled! 1.8 Bar it is!! :hurray: :hurray: :hurray: I can't wait! Will upload the results as soon as i get them :grin:
:fear: 1.8 bar spike yes, not requested. If you request 1.8 it will reach over 2.1 bar.
:crazy: should I be worried?
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Re: Maximum allowable boost on the VNT1749VA

Post by MeanTdi »

AshTDi wrote:
MeanTdi wrote:
AshTDi wrote:Great! it's settled! 1.8 Bar it is!! :hurray: :hurray: :hurray: I can't wait! Will upload the results as soon as i get them :grin:
:fear: 1.8 bar spike yes, not requested. If you request 1.8 it will reach over 2.1 bar.
:crazy: should I be worried?
Not if the tuner knows what he is doing.

I have been running 1.7 bar requested and boost spikes of 1.9 bar (I have seen 2.0 bar in 5 deg C twice)...but then after a run or two I let the turbo relax a bit.
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Re: Maximum allowable boost on the VNT1749VA

Post by Neuk »

MeanTdi wrote:
AshTDi wrote:Great! it's settled! 1.8 Bar it is!! :hurray: :hurray: :hurray: I can't wait! Will upload the results as soon as i get them :grin:
:fear: 1.8 bar spike yes, not requested. If you request 1.8 it will reach over 2.1 bar.
Again this depends on the tune of the map, overly aggressive maps with huge ramps and changes in boost will tend to spike more than maps with more gradual increases in boost...
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Re: Maximum allowable boost on the VNT1749VA

Post by dazza »

The 17 series turbos VA and VB series run outside their efficiency range after 2.1 bar from what I have read so 2.1 bar is really the absolute maximium.
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Re: Maximum allowable boost on the VNT1749VA

Post by Neuk »

dazza wrote:The 17 series turbos VA and VB series run outside their efficiency range after 2.1 bar from what I have read so 2.1 bar is really the absolute maximium.
I think the VA's start getting out of their efficiency range from 1.8-1.9 bar, with the VB's around 2.1-2.2 bar, I know I'd ratehr have a VB at the same boost pressure as a VA as it will run cooler and flow better...
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Re: Maximum allowable boost on the VNT1749VA

Post by amstel18 »

VB is the cupra turbo right?
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