Jump to content
SAU Community

Recommended Posts

I feared that might be the case. Though Garrett say suits 1.4-3 litre engines...assuming they're not talking about Group B rally cars lol...scaling that up, a pair of G25s in lightest trim could be good for a 26/30?

16 minutes ago, Birds said:

I feared that might be the case. Though Garrett say suits 1.4-3 litre engines...assuming they're not talking about Group B rally cars lol...scaling that up, a pair of G25s in lightest trim could be good for a 26/30?

Are you willing to go balls deep with custom manifolds, head work and piping etc Birdy?

Even then still realize you are talking about a potential 1100hp setup so its going to be laggy lol

I actually had in my mind the sizes of the larger one (660) as the size of the smaller. Still, the 550 is the same size compressor/turbine as the -5, so barring the slight reduction in inertia from the webbing of the turbine disc being removed lag would be similar. Airflow would be greater but this could prove a challange to manage with restricted pipework etc.

Now, if the release a G20-440 or something like that.. that has -5 flow in a smaller size... that'll be a good candidate.

-5 lag on RB30 I can definitely deal with, particularly if it's going to be punching well above its weight. It's not unbearable on a 26. That would fill the middle ground that make people want -10s but scared off by the lag.

  • 1 month later...
  • 1 month later...

Yeah for sure Disco..

 

There's already plenty of turbos in that size range that we run on our RB's... things like 2510, 2530, 2860, 2867, 2871 etc etc etc... yes they chock a little but they all perform well on low level RB engines.

 

As Disco said^ if these things flow the numbers Garrett are claiming, they'll be in the billet 3076 range on an rb25..

 

 

1st results in I've seen/heard of [emoji106]IMG-20180222-WA0012.thumb.jpg.02280bcd8cf4811760fdc56f9eed05ab.jpg  

 

  Just read the comments, it's the G-25 550 on a forged 2L engine on 99ron and using the .72 a/r rear housing.

This is looking very promising. Imaging what the G-25 660 on an RB25 with the same or next size up housing might be able to achieve and than add e85 to the equation [emoji848]

We might see GTX3076 high boost type power with response like a HKS Gt-Rs...

Here's the Facebook link -

 

EDIT: f**k....just noticed it's in flywheel HP [emoji17]

 

Interesting - thanks for that .

I think we can safely say that either of these G25s could do a lot better than a GTRS on an RB25 particularly in the upper turbine housing sizes . The $64 question is what happens to turbo response with big housings on G25s .

I know its early days but the T25 or V band mount option is going to be a deal breaker for some . At least EFR offers a T3 mount plus integral waste gate on their B2 (I think it is) frame  turbos . I did search to see what was available in 3" V band to T3 adapters - but they won't be a compact arrangement . Having stainless steel means at least fabricating changes is a bit easier .

Given the release time on the G series Garrett is taking a long time to get them out there - and even longer to release info on the slightly larger versions supposedly in the pipe . I'm hanging out to see what the next turbine size up is capable of - and I'm guessing it won't have to be very much larger to be just what many roadies want for a street RB25 . EFR chose 58mm for their medium sized B1 units , if Garrett does something similar then they should be able to achieve GT30-GT35 type performance with hopefully better turbo response than either of these .

Time will tell .

A . 

  • Like 1

I feel like I'm missing something, why are you guys implying this is a disappointing result?  I doubt that's on kill, it's not on E85 and it's not given anything away to the GTX3071R (which is a very proven performer on RB25s) but picked a lot up in spool - despite using the bigger housing, which would be more suited to the 660 compressor on a 2litre.

Where has it gone wrong?

Edited by Lithium

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • And finally, the front lower mount. It was doubly weird. Firstly, the lower mount is held in with a bracket that has 3 bolts (it also acts as the steering lock stop), and then a nut on the shock lower mount itself. So, remove the 3x 14mm head bolts , then the 17mm nut that holds the shock in. From there, you can't actually remove the shock from the lower mount bolt (took me a while to work that out....) Sadly I don't have a pic of the other side, but the swaybar mounts to the same bolt that holds the shock in. You need to push that swaybar mount/bolt back so the shock can be pulled out past the lower control arm.  In this pic you can see the bolt partly pushed back, but it had to go further than that to release the shock. Once the shock is out, putting the new one in is "reverse of disassembly". Put the top of the shock through at least one hole and put a nut on loosely to hold it in place. Put the lower end in place and push the swaybar mount / shock bolt back in place, then loosely attach the other 2 top nuts. Bolt the bracket back in place with the 14mm head bolts and finally put the nut onto the lower bolt. Done....you have new suspension on your v37!
    • And now to the front.  No pics of the 3 nuts holding the front struts on, they are easy to spot. Undo 2 and leave the closest one on loosely. Underneath we have to deal with the wiring again, but this time its worse because the plug is behind the guard liner. You'll have to decide how much of the guard liner to remove, I undid the lower liner's top, inside and lower clips, but didn't pull it full off the guard. Same issue undoing the plug as at the rear, you need to firmly push the release clip from below while equally firmly gripping the plug body and pulling it out of  the socket. I used my fancy electrical disconnect pliers to get in there There is also one clip for the wiring, unlike at the rear I could not get behind it so just had to lever it up and out.....not in great condition to re-use in future.
    • Onto the rear lower shock mount. It's worth starting with a decent degrease to remove 10+ years of road grime, and perhaps also spray a penetrating oil on the shock lower nut. Don't forget to include the shock wiring and plug in the clean.... Deal with the wiring first; you need to release 2 clips where the wiring goes into the bracket (use long nose pliers behind the bracket to compress the clip so you can reuse it), and the rubber mount slides out, then release the plug.  I found it very hard to unplug, from underneath you can compress the tab with a screwdriver or similar, and gently but firmly pull the plug out of the socket (regular pliers may help but don't put too much pressure on the plastic. The lower mount is straightforward, 17mm nut and you can pull the shock out. As I wasn't putting a standard shock back in, I gave the car side wiring socket a generous gob of dialectric grease to keep crap out in the future. Putting the new shock in is straightforward, feed it into at least 1 of the bolt holes at the top and reach around to put a nut on it to hold it up. Then put on the other 2 top nuts loosely and put the shock onto the lower mounting bolt (you may need to lift the hub a little if the new shock is shorter). Tighten the lower nut and 3 upper nuts and you are done. In my case the BC Racing shocks came assembled for the fronts, but the rears needed to re-use the factory strut tops. For that you need spring compressors to take the pressure off the top nut (they are compressed enough when the spring can move between the top and bottom spring seats. Then a 17mm ring spanner to undo the nut while using an 8mm open spanner to stop the shaft turning (or, if you are really lucky you might get it off with a rattle gun).
    • You will now be able to lift the parcel shelf trim enough to get to the shock cover bolts; if you need to full remove the parcel shelf trim for some reason you also remove the escutcheons around the rear seat release and you will have to unplug the high stop light wiring from the boot. Next up is removal of the bracket; 6 nuts and a bolt Good news, you've finally got to the strut top! Remove the dust cover and the 3 shock mount nuts (perhaps leave 1 on lightly for now....) Same on the other side, but easier now you've done it all before
    • OK, so a bunch of trim needs to come off to get to the rear shock top mounts. Once the seat is out of the way, the plastic trim needs to come off. Remove 2 clips at the top then slide the trim towards the centre of the car to clear the lower clip Next you need to be able to lift the parcel shelf, which means you need to remove the mid dark trim around the door, and then the upper light trim above the parcel shelf. The mid trim has a clip in the middle to remove first, then lift the lowest trim off the top of the mid trim (unclips). At the top there is a hidden clip on the inner side to release first by pulling inwards, then the main clip releases by pulling the top towards the front of the car. The door seal comes off with the trim, just put them aside. The the lighter upper trim, this is easy to break to top clips so take it carefully. There is a hidden clip towards the bottom and another in the middle to release first by pulling inwards. Once they are out, there are 3 clips along the rear windscreen side of the panel that are hard to get under. This is what the rear of the panel looks like to assist:
×
×
  • Create New...