Gt30r V's Gt35r

[R31Nismoid]

Nismoid the Garret turbine maps actually show the flow rates of the 0.82 GT30 and the 0.63 GT35 as having similar maximums though IMO the GT30 0.82 is the better map , these are with the T3 flanged GT30 turbine housings BTW because the 30 and 35 both use them .

True, they would be close.

However he wants to chase more power so I'd be dubious as to wether it'll get any better.

Going up 100hp in comp size/flow, but down in turbine housing size... Can be a nasty mix.

[Harey]

Agree 100%, I had average results with the GT35R with 0.63 housing. Better off with either a GT30 with 0.82 housing or a GT35 with 0.82 housing.

[simpletool]

25psi is still in a respectable efficiency zone of the 82mm compressor. It's out of the most efficient zone but still ok. Peak flow here is caps out at a touch over (60lb/min) , or almost 600hp before hitting choke.

If you use 90% of that flow then it equates to 440 to 450rwhp (assuming you had a larger engine). With 25psi as you stated you should get 410rwhp.

Can a 0.82A/R turbine flow this 410hp? Perhaps. You should check exhaust gas temps as you raise boost.

You probably won't need a bigger compressor just a bigger turbine (and total flow, so you'll also need a GT35 0.82AR). I'd guess a touch under 10% more lag ~400rpm, since you are only changing the turbine side to ~15% more flow. Why not have a look at the maps using true GT35 (3582) turbos and compare.

Edited August 31, 2010 by simpletool

[simpletool]

If you also change to E85 then you'll get roughly another 10% more power at same airflow, but you'll need much bigger injectors. So then you'll have the magic 450hp.

[boostn32]

thats all very interesting, as we all know the old faithful 20 is not the best choice for power, but ive always wanted

to know just how much a 2o can make when its a built engine, i think the limiting factor will be the valves and ports

buts that when the nitrous will come into play.

do you think i should remove the 26 intake and tb's and go for a longer runner and larger 8omm tb option.

i had never thought about a td series turbo, always thought they were a bit old school with response. maybe a BB TO4Z?

[GUN_METAL_GTR32]

i think definately lose the 26 tb and intake and go the new plazmaman one, definately the best u can get.

[R31Nismoid]

A larger plenum than what he has now will take longer to fill.

Longer to fill means...

(not saying the plaz stuff is bad quality or whatever).

[boostn32]

i was actually thinking of building one as 1k for the plazman ones is a bit rich.

[boostn32]

How would my 3040 with a 1.06 rear housing compare to a 3582 with a 0.82 in hp rating and response?

I can handle another 500rpm of lag if it means the possibility of making my power goals.

Edited September 1, 2010 by boostn32