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Which Turbo For Rb25Det?

VIP-32

By VIP-32,
in Engines & Forced Induction

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VIP-32 Enthusiast

VIP-32

Posted
Posted

Im just about to put a rb25det in my 32 coupe and i have the choice of the standard turbo or a vg30 highflowed turbo. I know next to nothing when it comes to turbos so I was just wondering what the better option would be and what each one would offer / the differences between the two.

If its of any help in making a choice i will be running a turbo back 3" exhaust, front mount, yellow jacket coilpacks and standard ecu. Probly not looking to boost over say 14psi as its mainly for street use and i will drive it as a daily pretty much.

Thanks in advance,

Matt.

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Captain Natro Grand Master

Captain Natro

Posted
Posted

quickly before anyone gets in here, have you tried doing a serch on the vg30 turbo (either on here or on Google), the standard turbos performance is well documented in here and I'm sure you'll find a rough figure for the vg if you search around...

75coupe Grand Master

75coupe

Posted
Posted

Those are pretty hard to come by these days, they have been discontinued haven't they?

well they are around just fewer, and they arnt the same low price/performance as a HG or VG30 highflow, but if the OP wanted real info it could just do a search...

standard ecu and turbo upgrade, I rest my case

GTSBoy Grand Master

GTSBoy

Posted
Posted

For f**k's sake. The RB20 ECU wil not even blink if you put a VG30 turbo on there. The car will just go faster.

The way you guys carry on anyone would think you have to retune your ECU when you change you bloody spark plugs. There have been about a bazzilion R32s with VG30 turbos slapped on them that have run perfectly well and made the same power on about 10 psi of boost as they do on 13+ on the original turbo. And the mixtures are fine, and the engine doesn't ping itself to death.

To the OP. You won't likely be able to run 14psi with a VG turbo because your standard fuel system won't be up to the task. If you do not have a bigger fuel pump than the original then you shouldn't really even turn the boost up on the standard turbo, because the old original fuel pump is probably only days away from dying anyway, and will drop pressure at the top end of the flow curve. If you put a bigger pump in then at least you will keep full fuel pressure and your standard injectors will run out of flow where everyone says they do, not 25rwkW earlier. But they will still probably run out well before you get a VG30 turbo to 14 psi.

Yellow jacket coils are shit. Expect them to fail.

Choose the VG turbo. Run it at standard boost and don't wind it up unless on a dyno or at least with a wideband on it on the road. It will be good.

hypergear Grand Master

hypergear

Posted
Posted

Any turbos is just a combination of wheels and housings, just the right on size for the job. .63 VG30 turbine is a good high flow base. Final out come depending on what the final goal is, car's setup as well as budget. I did a OP6 high flow (running same A/R turbine as vg30) using customized billet CHRA last year, made 293rwkws with full boost by 3400rpms on pump 98.

http://www.digi-hard...90911/power.jpg

http://www.digi-hard...0911/booost.jpg

Get a proper ECU if you are doing powered up mods. Other wise just bolton a R34 or VG30 turbo and leave it on 12psi of boost.

wolverine Grand Master

wolverine

Posted
Posted

For f**k's sake. The RB20 ECU wil not even blink if you put a VG30 turbo on there. The car will just go faster.

The way you guys carry on anyone would think you have to retune your ECU when you change you bloody spark plugs.

Read the post again,

i have the choice of the standard turbo or a vg30 highflowed turbo.

The OP is more than welcome to run a highflowed turbo on the stock ECU. Sure it will probably be ok (although we have no idea who hiflowed it).

I would run the stocker with those mods, you might go the other way...it hardly requires getting your knickers in a knot.

AngryRB Grand Master

AngryRB

Posted
Posted

Mate , first thing is to know where you are going with this, i started out with a highflow but you may soon get bored with that and wish you had more then wish you had just got a proper garrett turbo to take car of business, dont do things twice its too expensive....either do half measure with stock computer or go all the way and spend $$$$

my advice is get a highflow and be happy with say 220kw.. or go all way with a gt3076 or hypergear and go 280-300kw and know you have a real beast.....

Don Dada Mentor

Don Dada

Posted
Posted
For f**k's sake. The RB20 ECU wil not even blink if you put a VG30 turbo on there. The car will just go faster.

Who said anything about a rb20 ecu???

I would think if he's converting to a rb25det the smart thing to do would be to use a rb25det ecu, which will freak out even with increased pressure on a std turbo

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