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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old June 28th, 2018, 10:42   #1
AFNquattro
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Default gtb1749vk on 1.9tdi

I'm looking for someone who has an impression of the gtb1749vk on a vp 1.9tdi. The said turbo is off a 4.2tdi where there is a pair of them, it is water cooled and on the air inlet it has the anti-surge. It was converted to a vacuum operated actuator and at the moment is on an afn with 0.216 nozzles, pd130 intake with race pipe and is kept at 1,45bar boost. Runs better feeling wise than the previous turbo (gt1749va). Spools good and has a good "shove" but has anyone explored the limits of this turbo on the vp tdi. I have a 3bar map on the way to try and kick the boost up but will probably run out of injectors pretty soon after that.

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Old June 29th, 2018, 10:08   #2
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You will have no trouble running 2 bar boost (PR=3) with that turbo. Run just under 3000 mbar so that you don't saturate the 3 bar MAP sensor, and only enough boost to clear the smoke under your current fueling or it will be wasted and cost you fuel efficiency by having the vanes more closed than it needs to be.

What is the part number of your manifold? I haven't been able to find one that has the inlet pointed in the same direction as yours.
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Old June 30th, 2018, 00:42   #3
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Can't remember the part number but it has to be from a passat or a4 (longitudinal engine).
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Old June 30th, 2018, 06:47   #4
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From personal experiance, 2bar boost only for midrange. It can do 210-220hp when pushed but with that boost on higher rpm cw did 230k rpm...
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Old June 30th, 2018, 14:21   #5
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In reality is that any better than the plug and play bv43?
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Old July 1st, 2018, 22:39   #6
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Bv43 will not sustain 2Bar of boost in midrange without sufering, 1.7-1.8 Bar would be safe... I would ditch it altogether and get a 1756vk as a minimum or a gtb2060vklr...less surge and lower egt as well !
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Old July 2nd, 2018, 00:59   #7
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It'll do 1.85bar happily though (mine has for 40k miles) and just bolts on, Fine for 210bhp Its a very good turbo.
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Old July 2nd, 2018, 14:15   #8
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Yep, however after driving a few cars with bv43 and gtb1756vk turbos then the difference is there ! I have fitted a bv43a to a pd100 audi a3 a few years ago and that car was nice up to 100Mph however a s3 2.0 tdi PPD170 Bhp with DPF delete, gtb1756vk and a Unicorn racing tune was in another league altogether !
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Old July 2nd, 2018, 14:33   #9
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Dubious claim that a 60mm compressor would have less surge than a 49mm GT17V or BV43.
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Old July 2nd, 2018, 22:47   #10
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I drove a couple of gtb2060vklr 2.0 tdi and the pick up and transient is as good as the small frame gt turbos without increased egt and also better top end ! On the small gtb1749vk boost creep is an issue, whilst they seem perfect on paper they have their limitations... I am not trying to start a pissing contest, it’s just my own conclusions- feel free to disagree !
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Old July 2nd, 2018, 23:53   #11
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No pissing match intended, just none of what you stated describes surge. Facts and accuracy matter to me, that's all.
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Old July 3rd, 2018, 08:58   #12
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Pretty common to hear a boost spike on tip-in referred to as "surge" or else a "torque spike" because the car "surges forward". A bigger turbo responds slower so it is "smoother" with "no surge just smooth power" or whatever.

Compressor surge as a technical term is something else entirely
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Old July 8th, 2018, 22:14   #13
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Bottoming out my sprung hub clutch disk sounded like surge to my untrained ear, originally. When when I experienced it on my boost gauge with 0 to 10 PSI cyclic spikes, I learned that it isn't something you always hear.
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