Turbo replacement!!

[cooperquattro]

you should be running at 500 bhp(or close) with 2bar allready,i would consider the billet wheel before swapping turbo's..as said by prj gt35 is good turbo and can achieve 600 or so,also a smaller exhaust housing will get it spooling a bit faster,but you need to know which you have first ie .63/.82...
i have same setup so know where your coming from regards lag,but a smaller turbo is not as much fun

[Carfreak]

So it´s a good idea to keep my 35r and just upgrade it with billet wheel for faster spool ?
My goal is like 500bhp at around 2bar - maybe with another exhaust mani - I´m currently runnin a rs2 str manifold.

Prj: I know u don´t like the siemens dekas.. but are u reffering to the new models or the old 1 hole injected ones ?
I have the old ones with the big body and 1 hole style.. According to one of the best reputated tuners here in sweden these are really good!

[Carfreak]

What size exhaust housing????
What rpm 's full boost achieved at??
What boost pressure do you run??

Don´t know what exhaust side I have..
Full boost at 4-4,500rpm
1,7-2bar!

[prj]

35R is a good turbo, and it will realistically give 600hp with 7A cams and 8.0:1 CR.

30R will give you 500 and a bit extra with 7A cams, but I would run that turbo with stock cams, to have full boost at 4100 RPM in 3rd. You can run this one with stock compression ratio, and it will still make 480hp or more without much lag.

HX35, at least the ones available, with a K26 #6 housing it makes about 460hp, and full boost is closer to 3900 rpm in 3rd gear. The compressor wheel on it is 78mm, so bigger than a 30R, and the turbine wheel is 60mm.
If you fit a K26 #8 housing, you can get to 500hp, but it will be the same as 30R in a 3rd gear pull, full boost at 4200 rpm or so.
Dyno pulls in 5th gear with heavy meth injection have little resemblance to real world performance. 3500 rpm full boost is fairytales, it will never happen in a real scenario except for high gear.

However, the Garrett BB turbos will be much faster in 1st and 2nd gear. Especially the 30R, which will reach full boost in 1st gear and spin the wheels. The HX35 will only reach full boost by end of 2nd gear, in 1st gear it will not make more than 1.4-1.5 bar, same like a K26/K27.
The Garrett turbo has better transient response, but it is more expensive, and if something goes wrong with it, you're basically screwed. The HX35 is a lot more durable and rebuildable, does not need any kind of restrictors, and can be run with oil cooling only.

Also, if you want less lag, buy a V8 The 35R is still a manageable turbo, but it is slower than a 30R on 2.2T until 3rd gear. Unless you use antilag of course, but you are not going to when driving on the street.

P.S.
Your car probably feels like crap, because your MAF housing has been changed, and I doubt that it is running correct timing in the entire range.
You can easily pick up 200 rpm in spool just from running correct ignition timing.
With cat cams you will have even more lag. Use 7A or Shrick.

[Billman]

Billman, you'r right. I have a size #16 housing, in A/R sizing it should be something between .80 - 1.00.

more like 1.1 AR

[Thuppu]

Billman, you'r right. I have a size #16 housing, in A/R sizing it should be something between .80 - 1.00.

[Billman]

Holset HX35 Super is a 500hp turbo and the spool is somwhere like 3500rpm's...

http://koti.mbnet.fi/pro-ht/Audi_URS4/other/s4-2.2-20vt_hx35super_dyno.pdf

I'm running the HX40 Super and 1bar seems to be at ~4250rpm, not yet mapped. This is a 600+hp turbo.

These spool times depend mainly on the turbine housing. Your's a very big one on the Super40 but needed for max HP.

[Jamo]

GTX3076r is a pile of poo, turbine wheel is too small

[Nik0las]

what about GTX3076R recording to the charts this is 600hp turbo and full boost is achived earlier?

[prosty]

Think of it as foreplay with a good release, just like Jamo sais. "En som väntar på något gott" (one who waits for something good) :-)

[Jamo]

There's a lot to do before changing turbos, like he could send it away for the HTA billet wheel upgrade which will improve spool

[Thuppu]

Holset HX35 Super is a 500hp turbo and the spool is somwhere like 3500rpm's...

http://koti.mbnet.fi/pro-ht/Audi_URS4/other/s4-2.2-20vt_hx35super_dyno.pdf

I'm running the HX40 Super and 1bar seems to be at ~4250rpm, not yet mapped. This is a 600+hp turbo.

[Jamo]

Okey, that´s what I thought.. I´m running 7a cams but will go over to cat cams instead!

My goal is 500bhp after tuning it..

Running a pair of 7A cams increase lag in stock timing, the alternative is reclock them per Audi_CQ suggestions ( need adjust cams sprockets and wheels ) .

Yeah cat cams would be a good shout or Schrick

[cooperquattro]

What size exhaust housing????
What rpm 's full boost achieved at??
What boost pressure do you run??

[Carfreak]

Problem is you've broken the spool ceiling on the 2.2 to get 600 bhp you're in 4-5k spool area, below it you can run to 550 with a 3-4k spool 2.2 engine

I'd more look at your cam setup rather than a new turbo to see if you can get a better spool

Okey, that´s what I thought.. I´m running 7a cams but will go over to cat cams instead!

My goal is 500bhp after tuning it..