Dazza's-STi

just planning out some mods and was wondering on the general feeling regards swapping the turbo... i know the standard blower isn't much use after 330 bhp interm of throuput and life expectancy.. so a new one needed, for reliable figure of around 35-360bhp what is generaly considered to be the best buy... they APS sr40's look a good bet, anyone got one? or do you experts know of or use a prefered make\model...

Ta
Dazza

SPEN555

Dazza,

If your gonna go to the trouble of changing the turbo you may as well aim for 400bhp as it's a nice round number

Damian.

The Fixer

Dazza, dont bother with the APS SR40, there are better options around that are probably cheaper as well. PM'd you earlier.

David MY99

for the figures your after you could get a VF34. Same spoolup as the VF35 but a lot more topend power and for sale for $699,-- in the US

The Fixer

VF34 is not unlike the VF35 and will be flat out at that power all day long

Dazza's-STi

Ah, is that flat out in a good way, i.e it will do it all day no problem; or its flat out, and a better turbo would be running at lower stress.?

**** now i am confused...

Dazza

The Fixer

Better turbo would run at less stress than a VF34 would be running pushing 360 HP.

marklemac

I've been pondering this for ages (MY02 STI).

Conrad, what turbo would you recommend ?

alanjack

Well??? Conrad?

ZEN Performance

I just replaced the standard VF35 with a TD05 18g on a customers car. In conjunction with an uprated TMIC, cold air induction, 3.5" decat exhaust and remap the end result was very good. We actually started be trying to use the VF35 but it crept quite badly with the big exhaust, so it was decided to change the unit seeing as we had to removed it to even port the wastegate.

The difference is very noticable, paticularly at the top end, and on this paticular car we had full boost around 3000rpm, not laggy at all.

The 18g is capable of maxing out the standard injectors (at normal fuel pressure) so just about the ideal choice for a new age STI if you don't want to go mad.

Paul

loscooby

Hi there Paul!

So what you are saying is that with a td05 18g you might get away with not uprating the injectors( the walbro 255l I guess is mandatory)?

How much hp and torque would in your opinion be safe with the td05 18g along with a freeflow exhaust?
Did you port the td05 to avoid the boost-creep like you would on the std VF35?

/L-O

Dazza's-STi

Jeeez is that that longest time beween posts on a thread... almost exactly a YEAR!

Wow!

ZEN Performance

Yes I would say stick with the standard injectors. The 18g turbos come already ported, but have a larger wastegate flapper too, so can be further ported beyond a standard VF turbo. Should be good for around the 350-370hp mark (assuming a td05 16g is around 320-340).

Andy.F

Also consider the TD05-20G which runs very well on the Sti's.

We had an Sti 02 run 403bhp and 340lb of torque at Dastek last week, full boost of 1.4 bar at 3300rpm. This was running an uprated fuel pump, APS induction, decat and headers. Std intercooler and injectors.

Andy

The Fixer

Good result for the lowish boost Andy

The Fixer

MD321 Garrett Hybrid
20G for 400 or more
18G 380 ish? but may as well get the 20G

Conrad

alanjack

Well i needed some info

ZEN Performance

The 18g and 20g are different turbos, they are not "good" and "better". The 18g can be run at higher boost at low rpm (3000-4500 region) without surge, and although many people run the 20g without surge, some cars will have problems.

With sti cams and rev limit, 18g vs 20g is a tough call, if in doubt I would say 18g, and for those that want the extra power, but are prepared to work around the issues (if they should even arise at all) then go 20g.

The garrett based units offer more power, low lag (measure by time delay) but quite a high boost threshold RPM (what most people think of as lag).

Paul