Turbo choice for twin cam 4g63

groupAralliart · Post by **groupAralliart** » Fri Jun 01, 2007 11:44 am

I have searched and asked many questions and a clear answer seems difficult so I thought I might ask here and read opinions.

Firstly I set the basis of what the engine is required for: Daily driver (not big k's) and a Saturday sprints/Leyburn/Gatton etc events. i WOULD LOVE A ROCKET but it needs to be streetable and have bottom end.

So far the build is gathering parts which include a forget piston bottom end with a twin cam head set up, a steam pipe exhaust manifold. The intercooler and turbo are yet to come and it looks like the Autronic EMS is a popular set up with a lot of circuit/sprint drivers.

I have been told the Garrett turbo is a great option in either GT25 for rwhp of about 300 and a externally waste gated GT30 for over that with a .82 wheel? (what ever that means). I have no real idea of what HP to expect from a build of this type with about 18 -20 pound boost. The GT25 would be a great upgrade on 2.0 ltr motor and the GT30 would be great for a bigger HP motor but would it be very laggy for the lower end?

I imagine that there are many variables but would like to have a more educated assessment from others as to their experience with these two options.

Thanks Steve

JD_Stazza_Brendan · Post by **JD_Stazza_Brendan** » Fri Jun 01, 2007 12:04 pm

What flange is on your Exhaust manifold. As in T3 style, Mitsubishi TD style..

If its a mitsu style try a TD05 big 16G.
or if you want garrett try a GT28RS or slightly bigger.

Should give you some bottom end but not leave u choked for power up top.

groupAralliart · Post by **groupAralliart** » Fri Jun 01, 2007 3:09 pm

I should have explained that the manifold has not been purchased yet.

2000_turbo · Post by **2000_turbo** » Fri Jun 01, 2007 4:10 pm

I've got a Turbonetics T3/T4E Turbo .50 trim with a A/R of .64 with a Stage III Turbine wheel. http://www.slowboyracing.com/estore/pro ... 292&page=1

I'm very happy with it, it delivers great power and it holds boost very well even at 7800rpm. The downside is that full boost is around 3800 rpm.
If you don't like that, EvoIII big 16G is a better option and it's nice priced to!

Gr,

Martijn.

redzone · Post by **redzone** » Fri Jun 01, 2007 4:29 pm

i'd recommend garrett part number SB8005A, which is a GT3076R, would be on song by 3500rpm, and have more than enough power potential, rated at 500 flywheel hp..

otherwise maybe a TD05H 20G

S0LJAH · Post by **S0LJAH** » Fri Jun 01, 2007 8:38 pm

[quote="2000_turbo"]I've got a Turbonetics T3/T4E Turbo .50 trim with a A/R of .64 with a Stage III Turbine wheel. http://www.slowboyracing.com/estore/pro ... 292&page=1

I'm very happy with it, it delivers great power and it holds boost very well even at 7800rpm. The downside is that full boost is around 3800 rpm.
If you don't like that, EvoIII big 16G is a better option and it's nice priced to!
quote]

ive been offered a t3/to4b .57 trim .63 hot side turbo would this be a good option on a vr4 motor?
im worried it might spool up late and id be better off with the big16g?
i assume .57 trim would be later than urs a 3800rpm
where does a big16g spool and full boost?

2000_turbo · Post by **2000_turbo** » Fri Jun 01, 2007 11:43 pm

The .57 trim has a larger wheel then the .50, that means it spools later but has more power in the upper rpm scale. You can also run with more boost. The max boost that you can run with a .50 trim is 1,7bar.
If you want more info of the possibilities of the vr4 engines check;
http://www.dsmtuners.com There is a lot info on their forum!
The Big16G spools a lot quiker.

quest · Post by **quest** » Sat Jun 02, 2007 12:47 am

you could also try http://www.dsmtalk.com/forums/

The same 50 trim was the garret 'benchmark' for a street dsm before all this gt bb stuff came along. Its still proven a very good turbo and at a substantially lower price. 3800 full boost is good. DSMs gone mid 11s on pump gas with the 50.

57 trim normally t04E wheel, unless they're using the smaller t04b cover for clearance purposes ?

evoIII 16g experience boost creep with 3" exhaust. Porting the wg entry passage has solved many. Although responsive and considered a "small turbo", it has held 26-28psi to 7000rpm on some dsm *with cams*.
Moving heavy street cars weighing 3000-3350 pounds into the 11.8-11.4 zone requires a serious bit of grunt. For the money its a tough turbo to match.

S0LJAH · Post by **S0LJAH** » Sat Jun 02, 2007 11:29 am

it may be a to4e then

got offered to swap my big16g for the .57 trim t3/to4
wont be running ridiculous boost or anything(less than 20psi)
i think it sounds like it may be too large for what im after :?
ive got an external wastegate so will be running 3 inch exhaust and should be enough to get me the power i want with the 16g
and it will be mopre responsive than the t3/to4 wont it?

2000_turbo · Post by **2000_turbo** » Sat Jun 02, 2007 3:48 pm

The 16G is a lot more responsive then the .57. In your case the .57 trim is a bit overkill. I should stick with the 16G.

Good luck,

Martijn.

S0LJAH · Post by **S0LJAH** » Sat Jun 02, 2007 4:50 pm

sweet mate will do
cheers

merlin · Post by **merlin** » Sun Jun 03, 2007 9:17 pm

TD05 16G is a realy good turbo on a twin cam 4g63, especially for street use.

as you are having the exhaust manifold fabricated, the GARRETT GT28RS would probably make the same hp at less boost than the 16G, but cost a lot more unfortunately.

mrb1 · Post by **mrb1** » Wed Jun 06, 2007 12:21 pm

Use one of my GTpumps EVO3-20G's 220kW@20psi proven on stock VR4 engine, with cooler and 3" exhaust.
Dyno sheet is on my web site.
We also have normal EVO3-16G.

We can upgrade a 14B VR4 turbo to this spec (16G or 20G) if you can find one second hand.

S73R · Post by **S73R** » Thu Jun 07, 2007 4:23 pm

well i resontly put a td-04 turbo in my staz
it was cheap and spools so fast!!!!!
snaps the tacho over real fast no top end tho...
perfect 4 wat i needed

Austarion

Turbo choice for twin cam 4g63

Turbo choice for twin cam 4g63

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