Maximum allowable boost on the VNT1749VA

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Re: Maximum allowable boost on the VNT1749VA

Post by Neuk »

amstel18 wrote:VB is the cupra turbo right?
Yes...


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Re: Maximum allowable boost on the VNT1749VA

Post by J-10-M »

While on this topic,

What does a stock Sportline boost and spike at?
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Re: Maximum allowable boost on the VNT1749VA

Post by Neuk »

J-10-M wrote:While on this topic,

What does a stock Sportline boost and spike at?
Taking a guess but probably boost at 1.3-1.4 bar and spikes to 1.5 or so bar...
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Re: Maximum allowable boost on the VNT1749VA

Post by poloplayaWP »

What turbo does the 9n Polo have in. I have the recall turbo.

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Re: Maximum allowable boost on the VNT1749VA

Post by Sparkz0629 »

poloplayaWP wrote:What turbo does the 9n Polo have in. I have the recall turbo.
if its the recall 96 kw one, then its the VNT1749VA, as far as i know.
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Re: Maximum allowable boost on the VNT1749VA

Post by dazza »

Neuk wrote:
J-10-M wrote:While on this topic,

What does a stock Sportline boost and spike at?
Taking a guess but probably boost at 1.3-1.4 bar and spikes to 1.5 or so bar...
Sportline should be 1.4bar whilst the Cupra is 1.5 bar
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Re: Maximum allowable boost on the VNT1749VA

Post by Neuk »

poloplayaWP wrote:What turbo does the 9n Polo have in. I have the recall turbo.
Depends which 9n, the PD100 has the 15 series while the PD130 has the 17 series...
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Re: Maximum allowable boost on the VNT1749VA

Post by poloplayaWP »

Neuk wrote:
poloplayaWP wrote:What turbo does the 9n Polo have in. I have the recall turbo.
Depends which 9n, the PD100 has the 15 series while the PD130 has the 17 series...
I have PD130.

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Re: Maximum allowable boost on the VNT1749VA

Post by Sparkz0629 »

poloplayaWP wrote:
Neuk wrote:
poloplayaWP wrote:What turbo does the 9n Polo have in. I have the recall turbo.
Depends which 9n, the PD100 has the 15 series while the PD130 has the 17 series...
I have PD130.
then its the VNT1749VA
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Re: Maximum allowable boost on the VNT1749VA

Post by AshTDi »

Thanks all for sharing, some insightful stuff here, i'm sure many others are going to benefit from input that each one of you have provided :grin:

proof is in the pudding...off I go to increase that boost! :hurray:
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Re: Maximum allowable boost on the VNT1749VA

Post by MeanTdi »

AshTDi wrote:Thanks all for sharing, some insightful stuff here, i'm sure many others are going to benefit from input that each one of you have provided :grin:

proof is in the pudding...off I go to increase that boost! :hurray:
Try doing a two dyno runs on the same dyno, same day, to compare.
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Re: Maximum allowable boost on the VNT1749VA

Post by AshTDi »

good idea Mean, thanks
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Re: Maximum allowable boost on the VNT1749VA

Post by J-10-M »

Reviving this thread from the dead!

On the VNT1749A, what would you TDI guys recommend at the coast, is MY Crispy sea air better and is it fair to say if I had to run a 1.8bar max here in CPT it is somewhat "safer'' than doing it up in JHB?

As a gauge it seems most guys are running around 1.8Bar

Input is welcome :)
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Re: Maximum allowable boost on the VNT1749VA

Post by MeanTdi »

J-10-M wrote:Reviving this thread from the dead!

On the VNT1749A, what would you TDI guys recommend at the coast, is MY Crispy sea air better and is it fair to say if I had to run a 1.8bar max here in CPT it is somewhat "safer'' than doing it up in JHB?

As a gauge it seems most guys are running around 1.8Bar

Input is welcome :)
I am guessing you are quoting requested boost, correct?

Max requested is around 1.6 - 1.7 in Jhb (the actual boost spikes to 1.9 - 2.1). So, 1.8 at the coast is really testing the limits.

Like you said, maybe the guys at the coast are getting away with it maybe because in Jhb, the air is thinner and the turbo has to work harder.

Maybe see what the Durban guys have to say?
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Re: Maximum allowable boost on the VNT1749VA

Post by M@rk »

According to me safe boost on a VA is 1.73 Bar.
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Re: Maximum allowable boost on the VNT1749VA

Post by J-10-M »

Yes requested.

Are boost spikes bigger at the coast or jhb. What plays a role in the boost spike?
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Re: Maximum allowable boost on the VNT1749VA

Post by dhirennaidoo »

J-10-M wrote:Yes requested.

Are boost spikes bigger at the coast or jhb. What plays a role in the boost spike?
Condition of your vanes. Sluggish vanes means it takes them longer to respond to a requested position.

Tuner's ability to adjust the N75 map properly.

To a small degree, your driving style. If you mash the pedal down from a steady-state condition, the spike can be larger than if you 'roll into' the pedal.

EGR and exhaust system have an effect but I don't know enough to give a solid opinion on this (yet :wink: ).

Small boost spikes are normal, and are part of PID control. The proper way to answer your question is to get a compressor map for the 1749VA and decide from there. Higher boost is not always better.

Maybe PM sean919 or one of the tuners in DBN as they will have more experience with the 1749VA (or BV39 whatever we have here)
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Re: Maximum allowable boost on the VNT1749VA

Post by J-10-M »

What boost do the guys generally run without FMIC

So - like stage one - Decat and SW?
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Re: Maximum allowable boost on the VNT1749VA

Post by poloplayaWP »

J-10-M wrote:What boost do the guys generally run without FMIC

So - like stage one - Decat and SW?
x2 I also want to know.

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Re: Maximum allowable boost on the VNT1749VA

Post by Sparkz0629 »

On mine, with software, No FMIC, Decat,free flow back box, and PD160, i had a 1.8 bar map... no problems.
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Re: Maximum allowable boost on the VNT1749VA

Post by J-10-M »

Going to do SW this week!

Will probably request that we try get 'requested boost' to 1.6 maybe even 1.7bar.

What does Trevors Mild map generally run at?
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Re: Maximum allowable boost on the VNT1749VA

Post by M@rk »

J-10-M wrote:Going to do SW this week!

Will probably request that we try get 'requested boost' to 1.6 maybe even 1.7bar.

What does Trevors Mild map generally run at?
1.6 Bar
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Re: Maximum allowable boost on the VNT1749VA

Post by Neuk »

M@rk wrote:
J-10-M wrote:Going to do SW this week!

Will probably request that we try get 'requested boost' to 1.6 maybe even 1.7bar.

What does Trevors Mild map generally run at?
1.6 Bar
Mine would do 1.8 bar with a 1.9 spike but that was a few years ago...
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Re: Maximum allowable boost on the VNT1749VA

Post by J-10-M »

Software is happening on Thursday morning :)
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Re: Maximum allowable boost on the VNT1749VA

Post by sean919 »

Boost isn't everything on the diesels - far from it in fact. More boost only allows you to burn more fuel, so no point in running massive boost without the perfect fuelling to go with it.

I ran 1.8bar for ages without any issues, went to 1.9bar and the turbo lasted a week. It's the spikes that put them through their paces, and due to the minute size of these turbos, they just react too fast to completely damp out big spikes. My opinion is asking any more than 1.8bar constant is asking for trouble.
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