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GTR or VG30DETT turbos on RB20DET

Mr GTS4

By Mr GTS4,
in Engines & Forced Induction

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Mr GTS4 Mentor

Mr GTS4

Posted
Posted

just a thought. i know someone was looking at putting two rb20 turbo's on but i thought that it would be interesting to use the turbos off a gtr or a 300zx ( twin turbo version ) using the gtr manifolds put cut and weld the rb20 plate onto it so it will fit the block.

with running two turbo's through one afm, is that going to cause anything to happen?

i would maybe only run about 10 - 14 psi through that but still it would be better mid range and top end.

what is the size difference between the GTR and 300zx turbo's?

any info would be great

Cheers

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https://www.sau.com.au/forums/topic/45807-gtr-or-vg30dett-turbos-on-rb20det/
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mtopxsecret6 Experienced

mtopxsecret6

Posted
Posted

if you put the gtr cams in, port and polish the intake/exhaust hi flow the vg turbos, it will come full boost at approx 3~35. No probs at all, with power figures from 300hp and up.

Those who say its not worth doing, havent done it, or cannot afford to set it up properly.

Roy Grand Master

Roy

Posted
Posted
or cannot afford to set it up properly.

Thats the point, how much does all that cost, plus to get 300rwhp you are borderline on injectors so save all the labout costs of porting / hi-flowing and bolt on a 2530/2535 and have coin left over for injectors or cam wheels :P

...are you running GTR cams in your engine (RB20)?

Roy Grand Master

Roy

Posted
Posted

Its all good, like i have always said they are a $600 throw away engine, and really who would have bought a 170,000km old RB20 for more then $200?

Im only annoyed as im another one that will now be turning my back on the RB20 before i got the Trust setup workign properly, the final hurdle was a good tune (as opposed to the Jap ECU i was running with it) with the cam wheels and cam gears, and the car died 3mtrs fromthe dyno....that annoys me as i suspect the setup would have given me a great 250-260 rwkws with good power from 4000rpm up (it would have been running 1.3bar)

mtopxsecret6 Experienced

mtopxsecret6

Posted
Posted

two vg30det turbos/internal gate, walbro pump, gtr cams, gtr injectors, port/polish, exhaust maifold, and we are expecting it to be on boost at 3~35, with 4 at the very very latest. smooth on off bost charateristics. not lag lag boost wall...

Should have engine together very very soon.

Roy Grand Master

Roy

Posted
Posted

On what engine an RB20? be interesting to see the results, considering that an RB26 is a bigger engine and uses smaller std turbos and doesnt make meaningful boost/power that early, mind you it is a better flowing engine.

Good to see someone trying something different

mtopxsecret6 Experienced

mtopxsecret6

Posted
Posted

rb20 all the way. Are aimed power figure is 400hp atw. With the porting(isnt much clearance for porting compared to the rb20), polishing, and the gtr cams.. will give a greater puff, and longer puff duration. ie, earlier spool up times. Being a ball bearing setup.. hopefully knock 200 rpm off... We are not the first twin turbs rb20, there is another here in brisbane.. but the are using much bigger turbos.. and the characteristics everone are describing is the problems he is having. our misson goal is always, because they say it cannot be done.. means we can do it.

Our other project car is a barina swing. 1.3 liter. ~18~20 sec quater standard car. We told the public of brisbane,this is going to be a 13 sec car when finished. The amount of people who laughed in our faces... all they can do now is just let their jaw drop when they see the car in action down the quarter.

Cubes Grand Master

Cubes

Posted
Posted

mtopxsecret6,

Even with bigger cams it isn't going to do a great deal. You still won't get boost coming in how the std small rb20t turbo comes in.

The std rb20 turbo driving up a hill loaded up will make 1 bar by 3000rpm, general driving on a flat road and acceleration in say second will see 1 bar by 3500rpm.

But... You will find out. :P

And 400hp at the wheels.. is that with the VG30DETT turbo's? 2 of them generally only flow enough for around 220rwkw and thats with the bigger valves and much better flowing head than the small toy looking 10c piece valves.

Twin turbo's doesn't mean less lag, it all depends how it is setup.

If you set it up the Supra way then yes but setting it up the GTR generally doesn't yield any improvement compared to a similiar single turbo.

A GT2530 comes in hard at around 3700-4000rpm. They make 220rwkw.

As you can see there is bugger all difference.

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