3ltr conversion- variable timing

[driftr33]

hi has anyone done a 3ltr conversion using a r33 gtst head with the variable timing ive read a lot of info using a gts head without the variable timeing used . also wondering witch is a better 3ltr block to use either the australian version skyline or the vl block and does the rb25det gear box bolt straight up.

[matlowth]

G'day - yeah I've done the conversion... You can fit the VCT head, however mine was disabled and I had GTR cams, cam gears & valvesprings fitted at the same time.

Yep - I used the Series 3 VL commo non-turbo block, make sure you get series 2 or better block if you're going to use the non-turbo block because it's already got the oil returns for the turbo etc etc, and yes, the gearbox bolts straight up

Cheers,

matt

[GTS-t VSPEC]

If your doing the 3ltr conversion then I would recommend the RB26 head, but if your going to use the RB25 head then don't bother with the VCT, as soon as you want to do cams and cam gears it's going to go anyway.

There is a company here in Perth now that is starting to sell the 3ltr engines complete with forged internals etc, they are using both the RB26 and RB25 heads. I think sub-zero is also doing these engines?

See'ya:burnout:

[25GTT]

Whats the name of the perth company? will this engine bolt straight up to a gtst?

How much would they charge for a complete engine exchange and install?

[GTS-t VSPEC]

25GTT,

Hi, It's Steve at SST in conjunction with Grant Bojornac (Per4manz) and Danny (Superalign). I'm sure they are designed to drop straight in to the gts-t. You will have to contact Steve directly as I don't want to give out his pricing info without his authority.

I will talk to him soon and try and get the pricing, at least a rough estimate.

See'ya:burnout:

[driftr33]

thanks, im just getting as much info as i can coz i wanna do most of it myself and i wanna do it bit by bit over about a year, coz unfortunately i will be selling my line in about 3 months and buying another about the same time next year and then i wanna bolt the engine ive built in. so if anyone nos anymore specs and so on so i have a rough line to follow then it would be much appreciated thanks matlowth and gtst v spec for ur info and matlowth i was just wondering if u could give me a little more info such as what compression ur running have u had it balanced and blue printed , what stage cams are u running and so on and i would love to no ur power output thanks and gtst v- spec im gonna have to catch up wif u on the next cruise coz u seem like a champ. thanks phil

[GTS-t VSPEC]

driftr33,

I'll try and find out more about what they do in the 3ltr build-up then I can give you some more detailed info. It will depend what power you want from the engine, these ones are being built for high horsepower, 700+, and therefore will run forged internals.

The engine build will be expensive but alot of cost saving can be done by doing bits yourself.

See'ya:burnout:

[Guest Hotplates]

Yeah i've done it the other way around, that is a SII R33 (with VCT) on a R31 GTS II block.

I still have the VCT cams etc, but not hooked up. I've been told you can run an oil feed from the oil pressure switch to the head, drill a hole in the front(?), and block off the hole in the bottom of the head as it lines up with the water jacket.

[Spoolup]

The later model RB25 and series II have different length valve springs on the intake and exhaust side, so you can not use GTR springs unless the spring seat in modified to suit.

[driftr33]

yea i wanted to start with the vl block get everything balanced and blueprinted was gonna run a dry sump, forged pistons with the gtr head and a nice set of turbos and hook it up to a power fc, of course lots of other things aswell but take to long to list. thanks everyone for there input ... hey hotplates what type of horse power output are you getting.

thanks phil

[matlowth]

Yeah, the engine does BOLT straight in, but there's shitloads of work required to get the thing to go once it's fitted.

matt

Originally posted by GTS-t VSPEC

25GTT,

I'm sure they are designed to drop straight in to the gts-t. You will have to contact Steve directly as I don't want to give out his pricing info without his authority.

[matlowth]

Yep - no worries... The static compression I'm running is 7.8:1 (or there abouts), as mentioned, I'm running standard GTR cams (much bigger and you have to get a fair bit of work done to the head to allow clearance... Power output at the moment is around 316rwkw @ 14psi @ about 6000rpm - redline @ 7500. There's about 250rwkw from about 4500rpm. My injectors are flat knackers at the moment, so I don't think I'm going to go chasing too much more power.

Cheers,

matt

Originally posted by driftr33

matlowth i was just wondering if u could give me a little more info such as what compression ur running have u had it balanced and blue printed , what stage cams are u running and so on and i would love to no ur power output thanks

[GTS-t VSPEC]

matlowth,

Yes, I wasn't implying that it is easy, but if you paying a workshop to do it then they will think about all of the issues and be prepared, when you do it yourself then you have to tackle the problems one at a time.

The compression is very low, does this mean that you loose out on power?

See'ya:burnout:

[driftr33]

thanks matlowth and yea i no there will be lots of little things thats y im giving myself a year for the build. and one of my mates is an engine builder so if problems come up i have some help as well as most of my mates are mechanics plus the doing a lot of it myself is coz i enjoy playing with engines so it should be fun... im just getting as much info and as many specs as i can so i will no what bits and pieces i will have to get to put it together... thanks everyone if u could keep the info coming it would be much appreciated...

thanks phil

[matlowth]

Heh - I didn't do it myself, I paid to have it done....

Re: compression, nahh - it's better off boost than my old RB25 was. FYI - The static compression of a GTR is 8.0:1, and this has 0.4 of a litre extra capacity. With this setup, it makes more power everywhere than a stock motor, and with the low compression, it allows me to stick a fair bit of boost into it without having to worry about pinging. And as a street car that isn't going to be running C16 or VP racing fuel every day, that's the best option. Cheers,

matt

Originally posted by GTS-t VSPEC

matlowth,

Yes, I wasn't implying that it is easy, but if you paying a workshop to do it then they will think about all of the issues and be prepared, when you do it yourself then you have to tackle the problems one at a time.

The compression is very low, does this mean that you loose out on power?

See'ya:burnout:

[GTS-t VSPEC]

matlowth,

All sounds good to me, one day I might even build one up and drop it into an R32 GTR, it seems to becoming the engine of choice among the horsepower fanatics. Coming on boost earlier is definately a bonus, we can all do with the power sooner rather than later. Sounds like a sweet ride.

See'ya:burnout:

[driftr33]

very nice i like the sounds of that cheers fellas

[driftr33]

hey what size injectors r u running at the mo matlowth and what turbo have u got...

[matlowth]

gtst -vspec - If ya can afford to spend the bikkies then it's a great option, however, be wary that all the extra torque they make is just what kills gearboxes. The guy who does the work on my car has stripped two seperate gears and the input shaft (all seperate occasions) on a hollinger gearbox because of the masses of torque it makes.

driftr33 - They're 550cc injectors (which max out at around the 320rwkw mark), and the turbo is a T78.

Cheers,

matt

[GTS-t VSPEC]

matlowth,

Thanks for the advice, the gearbox is always going to be the weak point in a race car, don't know the best option as the Holligers are very expensive What about replacement straight cut gears for GTR box.

See'ya:burnout: