driftr33 Posted January 9, 2003 Share Posted January 9, 2003 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. Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/ Share on other sites More sharing options...
matlowth Posted January 10, 2003 Share Posted January 10, 2003 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 Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-123051 Share on other sites More sharing options...
GTS-t VSPEC Posted January 10, 2003 Share Posted January 10, 2003 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: Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-123055 Share on other sites More sharing options...
25GTT Posted January 10, 2003 Share Posted January 10, 2003 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? Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-123340 Share on other sites More sharing options...
GTS-t VSPEC Posted January 10, 2003 Share Posted January 10, 2003 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: Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-123350 Share on other sites More sharing options...
driftr33 Posted January 13, 2003 Author Share Posted January 13, 2003 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 Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-125397 Share on other sites More sharing options...
GTS-t VSPEC Posted January 13, 2003 Share Posted January 13, 2003 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: Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-125594 Share on other sites More sharing options...
Guest Hotplates Posted January 14, 2003 Share Posted January 14, 2003 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. Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-126436 Share on other sites More sharing options...
Spoolup Posted January 14, 2003 Share Posted January 14, 2003 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. Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-126562 Share on other sites More sharing options...
driftr33 Posted January 14, 2003 Author Share Posted January 14, 2003 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 Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-126826 Share on other sites More sharing options...
matlowth Posted January 15, 2003 Share Posted January 15, 2003 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. Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-127692 Share on other sites More sharing options...
matlowth Posted January 15, 2003 Share Posted January 15, 2003 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 Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-127699 Share on other sites More sharing options...
GTS-t VSPEC Posted January 15, 2003 Share Posted January 15, 2003 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: Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-127703 Share on other sites More sharing options...
driftr33 Posted January 15, 2003 Author Share Posted January 15, 2003 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 Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-127909 Share on other sites More sharing options...
matlowth Posted January 15, 2003 Share Posted January 15, 2003 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: Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-128004 Share on other sites More sharing options...
GTS-t VSPEC Posted January 15, 2003 Share Posted January 15, 2003 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: Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-128204 Share on other sites More sharing options...
driftr33 Posted January 16, 2003 Author Share Posted January 16, 2003 very nice i like the sounds of that cheers fellas Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-129376 Share on other sites More sharing options...
driftr33 Posted January 16, 2003 Author Share Posted January 16, 2003 hey what size injectors r u running at the mo matlowth and what turbo have u got... Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-129386 Share on other sites More sharing options...
matlowth Posted January 17, 2003 Share Posted January 17, 2003 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 Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-130101 Share on other sites More sharing options...
GTS-t VSPEC Posted January 17, 2003 Share Posted January 17, 2003 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: Link to comment https://www.sau.com.au/forums/topic/8431-3ltr-conversion-variable-timing/#findComment-130400 Share on other sites More sharing options...
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