Outer Limits 4x4 Board

Iv been looking at upgrading my dts turbo. Iwas looking at getting a gt2860, but i have heard they are great at the start but down the track they cause trouble with your head and manifold because they cause too much back pressure. just wondering if this sounds right?

Also what do people think of the gt3071r? would that be my next bet?

thanks

it all depends on
1 the power you want
2 where you want to make it in what rev range
3 what pump mods you have
4 intercooler
if you run a 10mm pump (gq pump) you wont get lots of power as the pump is too small and a gt30 probably wont make much boost for this reason

if you're worried about a 2860 choking the engine you are probably chasing more power. You could do any of the following:

get the 2860 with .86 exh housing
use a 2871 or 2876R has larger compressor wheel

the 3071R will take too long to come on boost unless you're running serious pump etc. even then very laggy.

i was told the same thing from axt about the gt2860 causeing head problems, but have not seen or heard anything on the forums yet would suck if it did because i have just started the change over from axt garrett turbo to gt2860.

i sort of find it hard to believe that they would be choking up the exhaust and causing head problems as it is bigger than a standard gu turbo if im not mistaken? and flows alot better/easier than a journal bearing turbo.
the only problem i can see is extra strain on exhaust studs and also running to higher boost.
but even then i find it hard to believe.
mayby the company is trying to pull ya leg.

hahah that came to mind because they offered another exh houseing for $450 haha

How much boost would a gt2860 handle? im looking at running 20psi with stock fuel pump and front mount intercooler.

Also wondering what specs people are using on the gt2860.

What would be the best setup?

Thanks

at 20 psi you're approaching the limit of the smaller diameter wheel anyway.

I'd suggest changing to a higher flowing turbo and running less boost (same volume of air but not as hot)

anzac wrote:at 20 psi you're approaching the limit of the smaller diameter wheel anyway.

I'd suggest changing to a higher flowing turbo and running less boost (same volume of air but not as hot)

What Exact turbo would you suggest for me? something that will spool up pretty quick. i dont want massive power just something that goes well

perhaps look at a GT2876R or the slightly smaller GT2871R.

Keep .64 exhaust housing

I sell these as a direct bolt in (so not adaptors and so on), if you are interested, PM me for a quote.

Being able to flow more air volume, you don't need to run such high pressures to get the same quantity of air. Running lower boost or not pushing the turbo so hard reduces the temperature of your charge air. The above turbos will spool up a little slower than the 60 but are still very drivable.

anzac wrote:perhaps look at a GT2876R or the slightly smaller GT2871R.

Keep .64 exhaust housing

I sell these as a direct bolt in (so not adaptors and so on), if you are interested, PM me for a quote.

Being able to flow more air volume, you don't need to run such high pressures to get the same quantity of air. Running lower boost or not pushing the turbo so hard reduces the temperature of your charge air. The above turbos will spool up a little slower than the 60 but are still very drivable.

Yep X 2, with the standard non modified pump the GT28 series .64 AR unit will work fine, though you may be at the top end of the scale at 20PSI boost.

I used the GT3071R on a modified TD42T with fantastic results, but pump and other expensive bits had to be worked to make it preform.

The only down side to using the GT28 on "high boost" (20 PSI and above) applications is premature failure of the cage bearings as the turbo was not really designed for a 4.2 litre diesel (as posted on the Garrett site, the 28 series is matched to a 1.4 - 2.2 litre engine)

The next build we are doing is using the GT3071R with the 63mm comp wheel. ie stronger internals and with less lag than the 71mm.

regards