Abo Bob Posted November 22, 2005 Share Posted November 22, 2005 This is my thread for the things I find out as my engine gets rebuilt. I blew the ringland between the 2nd and 3rd rings in no.6. All the other pistons were pitted etc. The rods are indeed the same as GTR rods (anyone want to buy the set I bought in case they weren't ) It appears that the head uses quite a different design than previous RB25's. More details to come. It uses a RB26 style oil pump but retains the short drive on the crank like early RB26's and all RB25's so I'm going to try to source a Jun crank collar. At this stage I'm thinking of 8.8:1 compression ratio to give me a bit of safety with the tune but hopefully not losing too much in the way of response or power. I've had everything from 8.2 to 9+ recommended to me which has been confusing. Removing the engine wasn't too hard with the help of Duncan and Ed. Thanks guys. I think that's it for now. Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/ Share on other sites More sharing options...
ed Posted November 22, 2005 Share Posted November 22, 2005 9:1 comp ratio! you know you want to! Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1734692 Share on other sites More sharing options...
Robo's Posted November 22, 2005 Share Posted November 22, 2005 How did you blow it? Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1734743 Share on other sites More sharing options...
PHATR32 Posted November 22, 2005 Share Posted November 22, 2005 8.0cr and 90psi boost YOU know YOU want it! Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1734761 Share on other sites More sharing options...
Cubes Posted November 22, 2005 Share Posted November 22, 2005 Whats the final power goal Abo Bob? Think of Optimax Extreme.. This would no doubt give you a little buffer running a high static comp with some decent boost. Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1735025 Share on other sites More sharing options...
Bass Junky Posted November 22, 2005 Share Posted November 22, 2005 What was the stock compression of the R34 Neo? Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1735071 Share on other sites More sharing options...
Oosh Posted November 22, 2005 Share Posted November 22, 2005 9:1 Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1735221 Share on other sites More sharing options...
Abo Bob Posted November 22, 2005 Author Share Posted November 22, 2005 Stock compression wasn't measured. Blew it - http://www.skylinesaustralia.com/forums/in...topic=87738&hl= Can't rely on the availability of Optimax 100 just yet. Bass junky with the same setup to what I will have (ie cams and turbo) could only put 0.9 bar into his engine but got great power there so I thought that with a little less compression I might be able to squeeze in the extra boost to make up for lower CR plus a little more for happy days. Some pics to come. Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1735360 Share on other sites More sharing options...
Bass Junky Posted November 22, 2005 Share Posted November 22, 2005 I spoke to GCG today about my turbo maxing out at 14 psi. He said that he's never heard of one making that power at that boost. He said they were most efficient at about 17 - 18 psi. I'll get to the bottom of this. Maybe RacePace are just the worlds best tuners....... Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1735393 Share on other sites More sharing options...
Cubes Posted November 22, 2005 Share Posted November 22, 2005 (edited) Abobob, Its definitely a concern, go with an 8.5:1 to be safe. On that note I believe Freebaggin is still running the stock 9:1, he hasnt mentioned the use of a thicker headgasket. He's running an internal gate .6 something GT3040R. I remember back when it was first fitted, ~270rwkw on 17psi, he has since fitted 256duration cams and cracked 300rwkw. Its not on an optimistic dyno either. It's not a NEO. Maybe the Neo has some issues with cam timing or something silly? I'm not 100% sure on the NEO VCT, is it constantly variable or?? Edited November 22, 2005 by Cubes Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1735880 Share on other sites More sharing options...
Abo Bob Posted November 22, 2005 Author Share Posted November 22, 2005 I will be fitting the Tomei Tybe B Poncams which are 260 degrees both sides and 9.15 lift. This will lower my dynamic compression ratio a little and hopefully make it a little more resistant to detonation. I don't know anything about the VCT. As for cam timing, all I know is that adjustable cam gears have been proven not to work on the NEO. Bass - maybe GCG are making better turbos than they think because I had 228 at 0.85 bar, no cams and auto. One dyno operator reckoned that was close to 250 in a manual although I think the R34 auto seems to be a less lossy transmission than some. It makes me wonder if Sydneykids GTT had a turbo with different specs (ie GCG are doing them different nowadays) or that it had a thicker head gasket in place before he saw it because with the same cams it takes an extra 0.5 bar to make not that much extra power. And let's not forget the reputable workshop who told me not to expect more than 220 at the limit of the turbo. Methinks some people have an agenda. Here are some photos my engine builder sent me last night. Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1736898 Share on other sites More sharing options...
Bass Junky Posted November 22, 2005 Share Posted November 22, 2005 Agenda? Definently. SK's 265rwkw figure was recorded in Shootout mode which at 250rwkw reportedly gives about 10-15 rwkw higher figure. Until the next dyno day on a shootout dyno, I'll not know what my car makes in shootout. I have the same cams Abo Bob. Here's my power curve.... It's fat. Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1736908 Share on other sites More sharing options...
Rolls Posted November 22, 2005 Share Posted November 22, 2005 Agenda? Definently.SK's 265rwkw figure was recorded in Shootout mode which at 250rwkw reportedly gives about 10-15 rwkw higher figure. Until the next dyno day on a shootout dyno, I'll not know what my car makes in shootout. I have the same cams Abo Bob. Here's my power curve.... It's fat. <{POST_SNAPBACK}> Thats a nice curve, must be pretty damn quick on the street. Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1737025 Share on other sites More sharing options...
Bass Junky Posted November 22, 2005 Share Posted November 22, 2005 It's nice! Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1737068 Share on other sites More sharing options...
silva33 Posted November 23, 2005 Share Posted November 23, 2005 Bass, Id like to compare your car to mine as i pulled 244 rwkw in my R33 HKS 2535 on 14psi (no cams), on the Racepace dyno. It would be interesting to see how they compare! Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1737193 Share on other sites More sharing options...
Bass Junky Posted November 23, 2005 Share Posted November 23, 2005 DYNOCHARTSORBAN! Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1737200 Share on other sites More sharing options...
satanic Posted November 23, 2005 Share Posted November 23, 2005 So you guys really rate the GCG hi-flow as the best option for the 34GTT? I have an auto as well and probably chasing 250rwkw for the time being. How much extra kw will this turbo give just by itself I'm currently on about 200 so I don't know. If it's a long way off, I might as well get a different turbo. Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1737203 Share on other sites More sharing options...
Cubes Posted November 23, 2005 Share Posted November 23, 2005 Silva33, Whats your diff ratio and tyre size. These should be compared in order to compare a dyno chart. Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1737213 Share on other sites More sharing options...
silva33 Posted November 23, 2005 Share Posted November 23, 2005 Cubes, im running 245/40/18, and stock diff artio and mods are: PFC FMIC HKS 2535 Nismo Fuel Pump Turbo back Exhaust, (3inch front, Apexi N1 Catback) 14psi Sorry the dyno graph is really bad, ill ahve to scan it in soon 244.bmp Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1737250 Share on other sites More sharing options...
Bass Junky Posted November 23, 2005 Share Posted November 23, 2005 Those lines are oth almost identical!!!! I'm keen on seeing your ignition maps! Mine are very conservative Link to comment https://www.sau.com.au/forums/topic/95854-my-rebuild-and-what-ive-found-out/#findComment-1737259 Share on other sites More sharing options...
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