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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old August 1st, 2010, 06:46   #1
Little Pickle
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Default N75 upgrade

Hi folks!

As it appears I have been having low boost problems for years and finally have found the cause! My 1z was taken from a 96 Golf and installed into a pocket size Seat Arosa (sig pic).

I cleaned my N75 valve with WD40 and the difference was night and day! The thing is crazy quick now. To give you an idea Audi RS4s cant get near me.

Anyway, my question is should I just change my N75 for the original or is there a better option? Maybe one from a MK4 or an after market one?

Any advice on this will be great.
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Seat Arosa 1z TDI. BB K03 Hybrid Turbo, 2.5 downpipe, PD lift pump, Custom re-map, PP520, Green cone airfilter, EGR delete, De-cat & boxes, FMIC from a Renault Master, Sparco Milanos, KW Variant 3 coilovers, 288mm Brakes, 320+NM, 150ish bhp.
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Old August 1st, 2010, 07:38   #2
TonyJetta
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No upgrade; just change it for an original one.

Tony
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Diesel fleet: 2006 Jetta, TDI, DSG, 35MPG avg; 2006 DC Cummins, CC/LB/DRW, Jake, 15.5MPG avg, 47kmiles; 1996 Passat TDI, 5sp, Project car! 204k miles, Avg 42mpg / best 48.9mpg, Troubleshooting Links: Whitedog's No Start Trusted TDI Mechanics A4 Limp Mode IP Timing Timing Belt FAQ A3/B4 Low Power Cyl Head Repair Fault Codes What you have just read is an opinion...take it as you see fit!
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Old August 1st, 2010, 14:14   #3
Little Pickle
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Ok thanks Tony!
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Old August 1st, 2010, 14:27   #4
BolaB4V
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Thinking of doing something with the N75 valve, not that Ive got problems ,but think that would be a fairly quick procedure to see if there's more power in there being overlooking. I know its pretty old. Never checked it and have put 56-7k on it since Ive owned it.
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Old August 1st, 2010, 15:50   #5
TonyJetta
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The wastegate actuator can be adjusted, but without a tune, it's hard to get more boost, reliably. The cheapest big bang for the buck, is nozzle upgrades.

Tony
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Diesel fleet: 2006 Jetta, TDI, DSG, 35MPG avg; 2006 DC Cummins, CC/LB/DRW, Jake, 15.5MPG avg, 47kmiles; 1996 Passat TDI, 5sp, Project car! 204k miles, Avg 42mpg / best 48.9mpg, Troubleshooting Links: Whitedog's No Start Trusted TDI Mechanics A4 Limp Mode IP Timing Timing Belt FAQ A3/B4 Low Power Cyl Head Repair Fault Codes What you have just read is an opinion...take it as you see fit!
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Old August 1st, 2010, 16:11   #6
bryguy
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Agreed, just put .216mm nozzles in my '02 Jetta and the thing is a rocket. HUGE increase in power! Car is otherwise relatively stock. It is really fun to drive now!
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