How much boost is "safe" on a Mk4 TDI

[Scatman]

Hi guys, I plan on getting software sometime in the future, I'd just like to hear what you guys have to say regarding the highest boost I can run without causing problems with reliability? From what I've read on other forums, 1.3-1.5Bar is the general average? I don't drive the car hard often, but I do give it stick at least once every time I drive it.

Also, would I need to do something to the diesel pump or injector nozzles, and will the stock intercooler be able to cope with cooling 1.5Bar of air? Thanks in advance

[ShaneTdi]

I think you should be safe with about 1.3Bar as that is about the increase you get from a very mild map.

[Scatman]

Panic said he ran a 1.5Bar map on his two Mk4 Jetta TDI's, and he had no problems whatsoever. I would just like some more input on the subject. 1.3 Bar doesn't sound like a big leap in terms of performance, as I am currently boosting around 0.9Bar.

[Killerwatt]

Remember its a diesel, you need fuel to make power not air. Boost is just there to reduce the smoke.
If you really wana go mad then import some bosio nozzles slap on a cupra turbo and smile to 180whp.

[ShaneTdi]

Remember its a diesel, you need fuel to make power not air. Boost is just there to reduce the smoke.
If you really wana go mad then import some bosio nozzles slap on a cupra turbo and smile to 180whp.

Now that would make a killer diesel.....

[M@rk]

Remember its a diesel, you need fuel to make power not air. Boost is just there to reduce the smoke.
If you really wana go mad then import some bosio nozzles slap on a cupra turbo and smile to 180whp.

Now this man speaks the truth ..

Boost only Reduce smoke..

But 1.5 bar is perfect

[carapau]

+1

1.5bar maximum. Also a cooler is always a great mod to do

[Scatman]

Okay done deal! 1.5Bar it will be. I'll do fmic at a later stage (next summer). I heard the automatic TDI Jetta's use 11mm lines/whatever as compared to my 10mm. What are they on about?

[Sinbad]

Remember its a diesel, you need fuel to make power not air. Boost is just there to reduce the smoke.
If you really wana go mad then import some bosio nozzles slap on a cupra turbo and smile to 180whp.

Now this man speaks the truth ..

Boost only Reduce smoke..

But 1.5 bar is perfect

NO NO NO
Boost does NOT reduce smoke.

Well yes it does, but that's not the reason for it. Diesels rely on excess air for cooling the combustion chamber. Running too rich raises EGTs too high and will cause kak down the line.

Cupra boosts 1.55 stock, 1.9 with a remap just btw.

[Neuk]

1.5 bar is fine for those motors...

Take a look at the http://www.tdiclub.com/ forum, there is a ton of information about modifying the VE series of TDi engines...

[VWicked]

That fuel pump is good for over 200hp.

your cooler is also thicker than teh sportlines one so should handle it fine.

[Killerwatt]

Not lines, that's the pump piston diameter. Basically bigger pump, more fuel and more power. But that only becomes an issue if you run some big nozzles. There was also a company that made 12mm pumps.

[Killerwatt]

Sinbad, you are correct but injecton timing, boost, smoke and egts are all interlinked. Iirc, you get smokey before egts become an issue.

[M@rk]

Hi guys, I plan on getting software sometime in the future, I'd just like to hear what you guys have to say regarding the highest boost I can run without causing problems with reliability? From what I've read on other forums, 1.3-1.5Bar is the general average? I don't drive the car hard often, but I do give it stick at least once every time I drive it.

Also, would I need to do something to the diesel pump or injector nozzles, and will the stock intercooler be able to cope with cooling 1.5Bar of air? Thanks in advance

Scatman don't get to technical about it ..forget about egt's biger turbo's how much it smokes or how much it boost and all of that **** ...

Just do a mild map software (1.3-1.5) a decat ,and Fmic then you will be good to go.

Unless you want to go big the you get technical.

Just my 2c

[Killerwatt]

yeah dont over think it yet, do tried and trusted mods and all will be good.
But check out Neuk's link, crapload of knowledge there.

[Stompie]

This much

[Scatman]

Thanks for the info guys, finally I know what the 10.11mm refers to. I already have decat and mufflerectomy, so that should possibly help with EGT's a little? I reckon I'll get the map to run 1.5Bar and maybe look at a fmic if the heatsoak is bad. The Jetta has a nice and thick intercooler, and I have done the vent mod which reduced heatsoak a great deal also. Thanks for the help and info guys, I really appreciate it!

[carapau]

Remember its a diesel, you need fuel to make power not air. Boost is just there to reduce the smoke.
If you really wana go mad then import some bosio nozzles slap on a cupra turbo and smile to 180whp.

Now this man speaks the truth ..

Boost only Reduce smoke..

But 1.5 bar is perfect

NO NO NO
Boost does NOT reduce smoke.

Well yes it does, but that's not the reason for it. Diesels rely on excess air for cooling the combustion chamber. Running too rich raises EGTs too high and will cause kak down the line.

Cupra boosts 1.55 stock, 1.9 with a remap just btw.

Wanna beat it reduces smoke?

[Sinbad]

Read my whole post and try again

[carapau]

;} most people think otherwise

[4ePikanini]

best bang for buck is to have a freeflow de-cat and a remap. (possibly a FMIC)

[BIGMIG]

Sorry but the statement that you need fuel to make power not air is utter crap. They work hand in hand with each other. The smoke is a nasty mix which also contains unburnt fuel. So to help burn fuel more effectively you add boost. That is how it makes it smoke less because the fuel is being burn more efficiently

[Tdi jetta 4 ever]

Sorry but the statement that you need fuel to make power not air is utter crap. They work hand in hand with each other. The smoke is a nasty mix which also contains unburnt fuel. So to help burn fuel more effectively you add boost. That is how it makes it smoke less because the fuel is being burn more efficiently

Finally, someone who speak more sense.

[G-spot]

Sorry but the statement that you need fuel to make power not air is utter crap. They work hand in hand with each other. The smoke is a nasty mix which also contains unburnt fuel. So to help burn fuel more effectively you add boost. That is how it makes it smoke less because the fuel is being burn more efficiently

^This!!^

Martin, As I told you before, Take your car to a professional (Trevor) and let him do his thing. He will dyno the car and work out what works best and gains the best result.

[BIGMIG]

^This!!^

What do you mean? Are you trying to say this guy? why