Jump to content
SAU Community

Recommended Posts

honestly i dunno but to get around 250 and more out of a standard rb25 on anything less then 17 psi, to me sounds a big challenge, and not to mention the end result will not be reliable.

  • Replies 166
  • Created
  • Last Reply

Top Posters In This Topic

I remember freebaggin made some where up around 270-280rwkw on 17psi with his hybrid turbo using a vlt turbine housing.

The turbo specs were selected by Tim Possingham, it was an expensive bugger though, just under 3k. I suspect the comp and or turbine housings had a little bit of power porting.

The HKS int. gate housings are around $800.

Edited by Cubes

With a .63 rear housing and a GT30 comp WITHOUT zaust cam you wont get near 250rwkw under 17psi IMO. With a zaust cam gear set to 3deg advance and a HPInABox GT30 with .63 zaust housing I am hoping to get close to 260rwkw at ~20psi but not over 20psi... I think (hope) that the .63 zaust housing is good enough swollow enough to avoid serging...

With a .63 rear housing and a GT30 comp WITHOUT zaust cam you wont get near 250rwkw under 17psi IMO. With a zaust cam gear set to 3deg advance and a HPInABox GT30 with .63 zaust housing I am hoping to get close to 260rwkw at ~20psi but not over 20psi... I think (hope) that the .63 zaust housing is good enough swollow enough to avoid serging...

No work done. However I think when considdering engine life you should be right at 20 psi as long as your knock is under control. Keep in mind that this is NO race car and will only see 20psi for short periods of time. Lets face it, how many roads are there in the ACT that will allow an rb25det with 260wrkw to be going full blat for any period of time :P I think there is some risk of doing a head gasket but thats no biggy, I will get a fater one when that happens to lowwer the compression and all will be sweet.

Trust me its easier to act ignorent rather than worry about it mate :)

Edited by GunMetalR33

Yea, rb25's a good engines and I have been told a a few people that the head gaskets should last on 20psi. I think its not GOOD for your engine & an engine with less power and boost will last longer...

Things to worrie about are:

ring lands (monitor knock & A/F ratio's and all should be fine)

head gasket (no more than 20 psi / adj cam gear at 3' adv helps this)

rods (dont rev rb25's over 7000 consitantly)

Before going big boost/power get a new timming belt and water pump...

I would like to get a zaust cam to lower the boost...

rant rant rant :P

yeh i agree, coz mines pushing out about 17psi and i have been scared off by a few people telling me it wont last long.... i guess its all about how heavy ur foot is.

dude,

please correct me if i am wrong, are you running an internally gated A/R .82 housing on your turbo?

if so, what brand?

Yea, rb25's a good engines and I have been told a a few people that the head gaskets should last on 20psi. I think its not GOOD for your engine & an engine with less power and boost will last longer...

Things to worrie about are:

ring lands (monitor knock & A/F ratio's and all should be fine)

head gasket (no more than 20 psi / adj cam gear at 3' adv helps this)

rods (dont rev rb25's over 7000 consitantly)

Before going big boost/power get a new timming belt and water pump...

I would like to get a zaust cam to lower the boost...

rant rant rant :P

same me i wanna get a set of zaust cams, help boost up a little better too....

dude,

is that a genuine Garrett GT exhaust housing?

all genuine mate, only thing that aint is the dump obviously. if ur after a turbo like mine give me a pm and i can organise u someone to give u a quote, i got mine pretty cheap..

honestly i dunno but to get around 250 and more out of a standard rb25 on anything less then 17 psi, to me sounds a big challenge, and not to mention the end result will not be reliable.

Its not challenge, ive done it, as have a few others also before me :)

get a new tuner

its just that im wondering how much psi a standard engine can take and for how long?

Its not just a simple question of PSI.

Do a search and a lot of reading. There are many many things that contribute to a motor shitting itself, not just psi.

mass iv, can you confirm at what rpm you are hitting full boost and if and when your tyres start to lose traction?

You mentioned earlier that the tuner said he was losing traction in 4th (or was it 3rd) to which other including myself thought too hard to beleive.

As I mentioned previously, I'm running just over 240rwkw with full boost of 16psi at around 3500rpm and there's no way in hell my car comes close to losing traction in 3rd with newish tyres on it.

In fact, it will hardly even lose it in second, if at all.

For the record, I'm running 225 Dunlop SP3000's on the stock rims.

Maybe the stocko 16inch rims give better straight line traction?

Maybe my car is actually running 200rwkw? (no way :))

As for you guys running GT30's, being a 550-600hp unit I'd say that 250rwkw is still quite a fair whack under the efficiency range of the turbo. I have a 460hp unit on mine pulling similar power with similar boost and still haven't hit the turbos limit. Need injectors :)

Perhaps we're seeing a limit with the stock cam setup because I was actually expecting more from this turbo (GT30) considering you guys have injectors giving you enough fuel for far more than 250rwkw.

ok id like to clear up a few things, my car is at full boost by 4000rpm, which is around 17psi. secondly it spins crazy in second and does a little into 3rd, i dunno if the dyno reading is incorrect but it deffinately feels as though my car has a little more then 240rwkw... not to mention i have smoked a few big powered cars..

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

    • Did this end up working? Did you take some pictures?
    • 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
×
×
  • Create New...