Physical Difference of Red I's

Lord Derpington

Hey guys,


Ive been wondering this for a while and since google isnt turning up gold here i am.

Im wondering what the actual physical difference between lets say a
vw passat tdi and a vw passat tdi
Besides the obvious horse power.

If its nothing more than the tuning then why when i go somewhere like here the lesser horse power after the remap still has less horse power so if its tuning only surely there shouldnt be a difference?

Thanks in advance

Damomayo

AFAIK there is different injectors used to achieve the extra Hp which would still allow you to increase the higher ones by remapping.

Anybody confirm or disagree?

Biro

You're wondering why a 100bhp Passat can go and get a remap, and come out with 145bhp (for example). And a 130bhp Passat can go and get a remap and come out with 170bhp. Is that it?
There's typically differences in the turbo, or if not then it could be boost pressure. It's usually not a simple remap from factory, they usually have one or two changes. Often the changes aren't that big either!
And for the record, the red i doesn't make a difference as the colours changed on the lettering too often for there to be any consistancy! Check inside the boot for the sticker that has the KW info.

mikewest

There was also the small matter that some garages had more red i's than silver so they just slapped them on willy nilly. There is a convention for the red I red DI and red TDI but it was not always adhered to. AFAIK there are some physical differences in the the different hp engine setups but would need to look it up before posting.

Lord Derpington

Well if its down to boost pressure and injectors, then theoritetically you could get the same bhp ect from a non "red I" as in the legit one as a legit red i ?

PaulKK

schoolbag2 wrote: »

<snip>

I'd probably hold off saying stuff like that when you've only been signed up for a month, tossy knows his stuff about VAGs.

greenfly wrote: »

Well if its down to boost pressure and injectors, then theoritetically you could get the same bhp ect from a non "red I" as in the legit one as a legit red i ?

As far as I'm aware the higher BHP engines have different injectors and a different turbo to the lower BHP ones, along with a different ECU map. Or so a mechanic told me anyway.

In theory if you swapped the turbo, ecu and injectors from the higher BHP you would get your extra power, although I'm not sure if any of the internals are different also.

Best way to check the actual KW out is to check the sticker in the wheel well and the one in the service book.

Biro

greenfly wrote: »

Well if its down to boost pressure and injectors, then theoritetically you could get the same bhp ect from a non "red I" as in the legit one as a legit red i ?

Yes, you can. You just need to know what's different. Everything else is typically the same.

caesar

[Reply quoting schoolbag2 <snip>'d]

Anyway I thought there was more to it than just the turbo and the injectors, isn't there a different block in the 130bhp and overall the whole setup is slightly heavier. Anyone care to clarify?

Lord Derpington

caesar wrote: »

What are you on about. There is so much crap spouted on this forum about TDIs and all the rest. Tossy is just a well informed poster. Im sure like many, he is sick of the number of times someone asks what the is difference between a TDI, TDI and TDI etc.

Im not wondering what the difference is in the idea of them doh, i know what you mean cos in searching for the answer myself all i came across was person after person saying basically eg. "tdi = 90bhp tdi=110bhp tdi=130bhp" and nothing else which wasnt answering any questions for me really.

Nice one lads, makes things a bit clearer in the head.

caesar

greenfly wrote: »

Im not wondering what the difference is in the idea of them doh, i know what you mean cos in searching for the answer myself all i came across was person after person saying basically eg. "tdi = 90bhp tdi=110bhp tdi=130bhp" and nothing else which wasnt answering any questions for me really.

Nice one lads, makes things a bit clearer in the head.

Sorry should have made my post a bit clearer, I wasn't having a go at you. I was just replying to another posters post. Your question was a different one as you have pointed out. Thats why I was wondering about it myself.

Biro

caesar wrote: »

[Reply quoting schoolbag2 <snip>'d]

Anyway I thought there was more to it than just the turbo and the injectors, isn't there a different block in the 130bhp and overall the whole setup is slightly heavier. Anyone care to clarify?

I'd be very surprised if there was a different block. In fact, it'd be absolutely nuts if there was.

mickdw

As far as I know, the higher rated engine is made from the same castings etc but they generally have alot of uprated parts, valve springs etc. Also the turbo is either uprated or running at a higher boost pressure although if it was only down to boost pressure, the base engine could to tuned to match the higher rated engine. I doubt that there are any injector changes. Its not that any significant additional fueling would be required.

DanGerMus

I'd guess that intake, cat and exhaust would play a decent part too. Unless they're all the same?

Sqaull20

greenfly wrote: »

Im not wondering what the difference is in the idea of them doh, i know what you mean cos in searching for the answer myself all i came across was person after person saying basically eg. "tdi = 90bhp tdi=110bhp tdi=130bhp" and nothing else which wasnt answering any questions for me really.

Nice one lads, makes things a bit clearer in the head.

130bhp 6 speed, when remapped can shift when on the boost.The rest are ok, even the 90bhp model is grand at overtaking.

Cosmo K

The TDI FAQ:

http://tdiclub.com/TDIFAQ/TDiFAQ-2.html#a

hope that helps.

voxpop

AFAIK the 130 and 150 share the same injectors and most everything else. The 150 have a bigger intercooler and turbo (more lag also).

The 115 and below have different injectors (different from 130/150).