300zx Turbo - Quieries

[Blue Dynamite]

Yo peeps, im looking at purchasing a 300zx turbo off a friend to put on the first model rb20det (one used in the sports R31)

I don't know anything about 300zx's really, but another mate reckons that a 300zx turbo (even though bigger) will give me significantly more usable and less lagy power than the turbo that came with the first RB20 engines. The 300zx turbo is a roller bearing one, (or something like that), it also had the numbers '630', on it (nfi). Also, what sort of things should I look for in guaging its condition?

I want to know what other information you can give me concerning this information and regarding 6cyl turbos in general.

He also has the second RB20 turbo for sale off an R32 gts-t, I want to know what difference in performance characteristics there are in case that is deemed a better option.

When posting in response, please remeber that this turbo will be used on the first of the rb20det engines.

Thanks a bunch!

Edited September 23, 2006 by Blue Dynamite

[R33_Beast]

If I were you I'd have a more thorough look at the turbo itself as standard 300zx turbos are the relatively small T25 size. I'm not too familiar with the turbos on early RB20's but I'd assume they'd both spool up quite similarly...if anything the zed turbo should spool quicker through being designed as a pair. I don't know what the '630' represents, the zed hasn't had upgraded turbos has it??

[Adriano]

You need to figure out exactly what 300zx turbo it is off, if its off a vg30dett out of a z32 300zxtt, they are tiny, as they are designed of a lagfree 1.5l motor. The ones people usually use is not off a 300zx, it is off a vg30det(3lt 24v single turbo)which is about twice the size of the above turbo. This is an upgrade to what you have got, but comes with quite a lot of lag. The only other turbo that it may be is off a Z31 300zx turbo, but these aren't roller bearing, but are quite large

[Blue Dynamite]

thanks for the responses so far people.

Adriano,

well, all I know is that this turbo is considered reasonably large. I think it's the first one you mentioned in the paragraph i'm quoting you on below., because I am pretty certain it is a roller bearing one. (i know it's a VG30 turbo)

The ones people usually use is not off a 300zx, it is off a vg30det(3lt 24v single turbo)which is about twice the size of the above turbo. This is an upgrade to what you have got, but comes with quite a lot of lag.

do you think i would be better off with the R32gts'-t turbo?

remembering that this will be on the first rb20det

[FATAZZ]

if your talking about the rb20det in the 89' model R32 skyline

you will have to get a bigger banjo bolt or buy a new fittings

as the 89model stock turbo has 1 oil line smaller then the

newer rb20det's.

[Blue Dynamite]

maaaybe, that sounds fairly early so it might be an exception to what i'm talking about.

I'm specifically talking about an rb20det out of a 2door r31, and putting a vg30 turbo on it.

[AnFz]

If its from a VG30DET then it will be quite laggy. It will come on hard, but dont expect much below 4000RPM

A much better match is an RB25 turbo. I ran this on my old redtop before I blew it up, and its quite responsive.

Also, is the motor ECCS or NICS (I presume NICS). This will effect the driveability of it and any mods you plan to do to it.

[discopotato03]

Given the above choises I'd go the R32 GTST turbo because they make a good base line - at least Nissan thought so . The TT VG 30 used a T2/T25 hybrid turbo and I'd give that a miss .

The early RB20DET's were a bit breathless and the best mods seem to be as much in the way of R32 RB20 bits you can throw at it . If it were me I'd be fitting the complete R32 head/manifolds/turbo + all electrics loom and ECU . The early engines had the throttle plates to block half the 12 inlet ports and open further up the rev range in an attempt to get some air speed and torque into an engine with small pots and a tiny bush bearing turbo . Toyota did this sort of thing with early 4AGE's but gave it up for better ports/manifolds/cams/CR and tuning . Nissan went to better porting/manifolds / engine controls and a far more responsive turbocharger .

Cheers A .