Turbo upgrade for TDI?

[Buller_Scott]

Hi Cogs,
i dont see the point in a DP on this size turbo, however Ill do a high flow cat and muffler just to free it up a bit more.... Have also done a SEAT intake which made power delivery smoother.

hey golf_man, do you reckon? you dont think a 2.5'' mandrel bent on a chipped 1.9 pd100 diesel would have any performance effect? from the info i've read both on here and on vwclub za, i woulda thought that not only would a dp have some positive performance effect, it would also reduce egt's and thus help the turbo's longevity, especially after chipped? (my thoughts: seat + chip + dp = good power gains, yet sustainable mods which will facilitate longevity of stock turbo).

(please no-one moan "what do you want to do perfomance exhaust mods on a polo diesel for, when you could get some v6 sonata/ camry/ holden ford from the early 2000's instead?" at me, im simply asking, as the dp seems to have been a very good bang-for-buck mod with the gti boys, and i was thinking, what with the turbo constantly on boost, the dp would double as a good turbo support mod AS WELL as providing a few extra horsies....

yeah! session timeout!

[gldgti]

hey golf_man, do you reckon? you dont think a 2.5'' mandrel bent on a chipped 1.9 pd100 diesel would have any performance effect? from the info i've read both on here and on vwclub za, i woulda thought that not only would a dp have some positive performance effect, it would also reduce egt's and thus help the turbo's longevity, especially after chipped? (my thoughts: seat + chip + dp = good power gains, yet sustainable mods which will facilitate longevity of stock turbo).

(please no-one moan "what do you want to do perfomance exhaust mods on a polo diesel for, when you could get some v6 sonata/ camry/ holden ford from the early 2000's instead?" at me, im simply asking, as the dp seems to have been a very good bang-for-buck mod with the gti boys, and i was thinking, what with the turbo constantly on boost, the dp would double as a good turbo support mod AS WELL as providing a few extra horsies....

yeah! session timeout!

noone here is going to tell you not to mod you're diesel mate.

generally, all diesels benefit from an enlarged and pressure free exhaust post turbo in order to lower EGT's and increase the pressure drop across the turbo - ie quicker spooling time.

it is unlikely you'll notice a LOT of difference in performance, but if have an EGT gauge, you'll definitely notice a difference there, and that can only be a good thing.

[GoLfMan]

hey golf_man, do you reckon? you dont think a 2.5'' mandrel bent on a chipped 1.9 pd100 diesel would have any performance effect? from the info i've read both on here and on vwclub za, i woulda thought that not only would a dp have some positive performance effect, it would also reduce egt's and thus help the turbo's longevity, especially after chipped? (my thoughts: seat + chip + dp = good power gains, yet sustainable mods which will facilitate longevity of stock turbo).

(please no-one moan "what do you want to do perfomance exhaust mods on a polo diesel for, when you could get some v6 sonata/ camry/ holden ford from the early 2000's instead?" at me, im simply asking, as the dp seems to have been a very good bang-for-buck mod with the gti boys, and i was thinking, what with the turbo constantly on boost, the dp would double as a good turbo support mod AS WELL as providing a few extra horsies....

yeah! session timeout!

you make a very valid point there!
its all on the list of things to do mate, it all just takes time and money

[Greg Roles]

noone here is going to tell you not to mod you're diesel mate.

generally, all diesels benefit from an enlarged and pressure free exhaust post turbo in order to lower EGT's and increase the pressure drop across the turbo - ie quicker spooling time.

it is unlikely you'll notice a LOT of difference in performance, but if have an EGT gauge, you'll definitely notice a difference there, and that can only be a good thing.

And I reckon essential to do BEFORE raising the boost. I'd bet it's why those few 2.0 103kw TDI's have popped impellers / shafts after chipping. Too high EGT's.

[GoLfMan]

And I reckon essential to do BEFORE raising the boost. I'd bet it's why those few 2.0 103kw TDI's have popped impellers / shafts after chipping. Too high EGT's.

yeh i recon so too, but i also recon this is because of a restrictive intake aswell so the engines working harder to breath through a tiny stock intake (on the Polo anyway!) if you ease pressure both ends you'll get some more longevity out of it

[Buller_Scott]

And I reckon essential to do BEFORE raising the boost. I'd bet it's why those few 2.0 103kw TDI's have popped impellers / shafts after chipping. Too high EGT's.

hmmm. thats abit worrying (given that they're new cars).

now begs the question: do you need a remap of the stock map (e.g. at a vw dealership), as a result of having JUST better air intake AND custom DP?

would an opened up DP make the computer think, because there is more air flow back of the turbo, that there is a leak in the exhaust?

any ideas? anyone? i'd be keen to know- it would be funny to waltz up to a vw dealership (if you HAD to tweak the stock map to make way for a custom dp), and ask them to void your warranty with VWA by remapping your stock map to make way for a custom dp, lol omg YAY!

[GoLfMan]

your ECU wont so much as blink an eyelid at a bigger air intake and dump pipe, i know mine didnt when i put the new intake on it it just smoothes out the power delivery.

also alot of dealers arent going to know if you put a SEAT intake on it, its an OEM part thats be retro fitted, whats wrong about that!

as for dump pipe, i couldnt say, but regardless you definately WONT need a remap for the DP and intake

[Buller_Scott]

yeah, i know about the CAI as i did a knock-up job on one a couple of weeks ago (parts from bunnings and autobarn). im not going to say that im getting any more power, but delivery is DEFINITELY smoother, power comes on earlier in the rev range, and for the $30 bucks i spent on materials, i figured its a cheap insight into just what i would be looking at when either a) i get my seat intake, or b) i find the parts (repco, autobarn) to put together a FAT silicone hose job, straight into the airbox.

it'd be interesting to see if you could get away with a dp (e.g. 2.5'' mandrel) on a stock remap, without having to tweak the map, and also with no error codes popping up.

but who am i kidding? arent apr/ oettinger doing a xmas sale, after which, due to the low au$, prices are going up? soooooo tempting.....

[Greg Roles]

What you do to the engine on either side of the turbo, the biggest restriction of all, won't affect the ECU. If you have a look, the MAF sensor is after the airbox, and the Oxygen sensor is high up in the exhaust, so after these points you could effectively cut off the pipe and run no filter at all, and the engine ECU would have no idea.

A dump pipe would be a great, response building and probably power adding idea. I have no problems in my plans for one, even with the added complexity of a DPF and the varous sensors we GT TDI'ers have to factor in.

you Polo dudes should go for it!

[Greg Roles]

hmmm. thats abit worrying (given that they're new cars).

now begs the question: do you need a remap of the stock map (e.g. at a vw dealership), as a result of having JUST better air intake AND custom DP?

ANY turbo, pushed beyond it's limits will go bang. Age has nothing to do with it. The 103kw TDI where there have been two die to my knowledge have a lot less thermal handling features than the 125kw, where even the water cooling in the head has been improved. Most ECU "chips" factor this in and aren't pushing things too hard, but it's always a factor. It's why smart people up the cooling capacity first, such as Golfie here with a bigger intercooler.

[Mister_duck]

And I reckon essential to do BEFORE raising the boost. I'd bet it's why those few 2.0 103kw TDI's have popped impellers / shafts after chipping. Too high EGT's.

Maybe thats what happened to my turbo when it blew up on my 2.0 Tdi ?

The first time it blew I had the reflash on, the 2nd time the turbo blew up I was complety stock

[GoLfMan]

yeh us Polo TDI owners are lucky, our engines have alot less electronic nannies than the Golf TDI owners

[Buller_Scott]

Maybe thats what happened to my turbo when it blew up on my 2.0 Tdi ?

The first time it blew I had the reflash on, the 2nd time the turbo blew up I was complety stock

what happened when the turbo blew? does the car just die in the ass? (ive never seen/ had this happen before).

i've heard that with the vnt's its really, really bad to drive the car after the turbo is blown- did you get yours towed to a dealership?

[Buller_Scott]

What you do to the engine on either side of the turbo, the biggest restriction of all, won't affect the ECU. If you have a look, the MAF sensor is after the airbox, and the Oxygen sensor is high up in the exhaust, so after these points you could effectively cut off the pipe and run no filter at all, and the engine ECU would have no idea.

A dump pipe would be a great, response building and probably power adding idea. I have no problems in my plans for one, even with the added complexity of a DPF and the varous sensors we GT TDI'ers have to factor in.

you Polo dudes should go for it!

yep. i'm a peculiar, very mercurial little monkey, but i think i've made my mind up about this one.

so, after 6 short months of owning the car, my approach to modding is as follows:

- DP and seat intake (within the next month)
- better rubber and maybe these wheels: http://cgi.ebay.com.au/ws/eBayISAPI....m=130274735177
- whiteline rsb
- eventually (perhaps just before next snow season) HR cup kit.

yay!!!!!! thanks guys. your input is, as always, very, very appreciated.

cheers

[Mister_duck]

what happened when the turbo blew? does the car just die in the ass? (ive never seen/ had this happen before).

i've heard that with the vnt's its really, really bad to drive the car after the turbo is blown- did you get yours towed to a dealership?

car is undrivable with blown turbo, well mine was anyway, that and I didn't want to risk anymore damage.

First time turbo blew, no prior warning, just driving along, changing gears, there was a bang, and smoke was pouring out the back.

The 2nd time it blew up, there was a funny noise that sounded like the turbo was playing up, then the engine light came on, car went into limp mode( car wouldn't rev higher then about 2.5k), then no later then about 5 mins, smoke was pouring out the back of the car.

Car seems to running fine now
All up I have had 2 turbo's, 1 engine, 1 full exhaust, 2 cat conveters, 1 water pump, 1 starter motor all replaced under warranty