Phat_Toni

This 2.5 STI makes 20 PSI by ~4100 with a 0.72...G25 660 - that kind of puts my result in the ballpark with the bigger housing. https://www.youtube.com/watch?v=eoem4Gv06ec&feature=youtu.be That SR with 400kw was surely using a 0.92 and looks to spool better than both of these setups. Was that on a hub dyno? Need more examples to gauge what to really expect spool wise on an RB I think

So today was the day. This is a G25-660 0.92 on a 30+ year old unopened RB26 with unknown kms. Green is my previous tune using factory R34 GTR twins. My tuner seems to think that there would be another 40ish kw in it with e85 on similar boost. I had the pressure source coming from the comp cover when I probably should have had it coming from the plenum (before throttles) as I did previously. I think this at least contributed to the boost taper. (Hits 18 sofltly and tapers to 16) This was done with a 6 Boost manifold, 4" dump into a 3.5" system. I don't know how hard he leaned on the gate pressure setting (eBoost Street) but boost response doesn't look overly impressive by these graphs. 130kmph is just under 4500 if the calcs are right (643mm rolling diam tyre, 4.11s, 4th gear 1:1) I cant stand the waste gate cycling sound that the EBC and the screamer make. It sounds sooooo good on gate pressure with no pulsing so I might be back to sort something out soon. Peak power was at 8000rpm. Retains factory 8200 rpm limiter

G25 660 0.92

Progress pic...

There seems to be limited information so far but it looks like the exhaust inlet/outlet location between g25 and g30 look to be identical, making at least the rear section of the turbo able to be swapped without modification to the exhaust. This should put the core in the same location too. Very interested to see how the G30 based turbos compare to the GT30 based turbos in terms of response. Im expecting response somewhere between GT30 and GT35 in comparable housing sizes...time will tell

I think this car was mentioned earlier in the thread. Gives a good idea as what to expect from 2 of these things....

I guess the race is on now. I went with a 6boost. Cant fault the quality. Looking to pull my motor this weekend, Will still be a while by time I get it all sorted

I will be putting a G25-660 0.92 on my RB26 soon. My inspiration was my missus' 25 neo with a GT3076r 0.82. makes 297kw on 19psi. Thing is a torque monster. (9.5:1 probably helps) The g25 660 with the 0.92 looks comparable to the GT3076r but seems to have the edge in turbine flow, compressor flow and spool. Will be interesting with stock unopened 25+ year old RB26. Breathes pretty heavily but doesn't use a noticeable amount of oil. Compression on No. 4 is 130psi, rest are 140. Probably wont push it past 20psi just to keep it together. Has been making 270kw for last 5 years with 34 factory twins. If i get a year out of it I will be happy. Have all the goodies ready to go, everything is a little overkill with room to improve when I build a motor g25 660 0.92 from ATS 6boost mani 50mm gate ID1050x Nistune pmas hpx-n1 3.5" turbo back 3/8 PTFE fuel lines/filter/reg/rail sized to suite E85. Will be tuned on 98 only for now.

interested in motor/box if sale falls through

Nice build man, we'll have to go for a cruise sometime How many kms u done on the new bottom end now?

Thanks for the replies guys. I ended up opening up the loom Each injector has 2 wires going to it - 1 of my wires was a different colour than described in in the pin-out pdf floating around. This was throwing me out at first The wires have silver dots stamped on them: 2 dots - signal from ecu 1 dot - power Chopped all the 1 dot power wires and wired them into the ballast resistor, taped the unused ends up and hooked up 12+ Ign to the ballast Fired up first time huge relief.

would love to get this running tomorrow guys. from what I understand, when putting an rb26 into a gts-t you still need to wire in the resistor ballast into the 26 loom? I don't have a common power feed for my injectors like in the 20 loom (shown in the wiring up GTR injectors to rb20 tutorial). each injector wire seems to run separately. Surely someone knows what im on about here Thanks

Thanks heaps mate, I just spent ages trying to find out what was going on. Is the plug apart of the body loom? or the engine loom? ive got the ballast here but nowhere to plug it into

Hey guys, Just finishing off wiring my 26 into my r31. I cannot fuigure out where the plug for the Injector ballast is on the 26 loom. I know its an 8 pin, im thinking that maybe my loom might be missing it? Im scratching my head in the shed now so any replies would be helpfull Thanks guys