Jump to content
SAU Community

Recommended Posts

I have been reading but cant get what I want so this topic is going up.

Turbo for RB20, standard internals with all supporting engine mods including

-Wolf3d V400

-GTR injectors

-BLiTZ I/C kit

-3" turbo back exhaust

-GTR fuel pump

-Turbo GTXXXX?

Now I am aiming for 220rwkw+

Turbo choices which I have looked at are GT2535, GT28RS, GT2530, GT2871R. Few people said maybe even GT3037?

Basically all the GT2530's I find are to suit SR20 so are of a T25 flange. My question in regards to this turbo is, will it be too small for an RB20 thats looking at pushing 220rwkw+ ?

Is it best to just find a T3 flanged GT2530 or would be be okay to use a T25 flanged one with a adapter plate?

I have read in many articles that the HKS2530 is perfectly balanced for an RB20 motor, but it seems there aren't any T3 flange specific, is this the case?

Is there any size difference in 2530s in T3 flange and in T25 flange?

Question for GT28RS, GT2535, GT2871R: I have been told it might be to laggy on an RB20? When am I expecting full boost, and what power level is it likely to max out at?

Or if anyone can suggest any other turbo which would be ideal to get 220rwkw+ that would be much appreciated.

I don't mind the lag, and I don't mind if the turbo is a little big for the RB20, I can always use it on an RB25 motor later down the track.

I want to stay low mount and internal gate, so please don't suggest anything that is firstly not able to be low mounted on standard manifold, and secondly not internally gated.

Ideally I would like to get it to no more than 240rwkw, but anything around 220rwkw or beyond is more than enough for me.

Any help or input would be much appreciated. Please don't tell me to search or check through the forum as I have done so, and I need specific replies to my questions in relation to those specific turbos listed above.

If anyone has a thread with all the answers, or a specific answer to one of my questions, feel free to post it up for me to read. :whistling:

Thank you in advance,

Abu

Edited by abu
Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/
Share on other sites

  • Replies 132
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

Been in a few cars now with RB25 turbos and not a huge fan. Sure they are a good budget upgrade, but they arent that responsive...they dont make great power and are still fragile.

I have been in a few RB20s with 2530s and they are clearly better.

Just play with the cam gears and pay for a good tune. 2530 can be a good thing

Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/#findComment-3334649
Share on other sites

Dale_FZ1 has a 2871 based high flow. Full boost (15psi) at about 2800rpm on the RB25.

I'd say that would be about 3400rpm on a RB20

Thanks for that Jono.

I have heard of another member running 2871 on his RB20, making about 220rwkw on roughly 18psi tuned with a wolf v500.

That didn't seem to bad to me, 3400 isn't tooo bad I suppose!

2530 I had on my rb20 was starting to pull at 3,500rpm full boost 1.2 bar at 4,200

so laggy to some people (me included)

much better off sticking to under 200rwkw imo and going rb25/vg30 turbo

Really? I thought they were a little quicker spooling than that. I have heard from many that 2530 is supposedly one of the best balanced turbo for the RB20..

I also drove an R33 back a few years ago, running a 2530 on 18psi and that thing was spastic! That car it self made me want to buy a skyline.. lol

Under 200rwkw is easily achieved, can get to about 190rwkw with a stock RB25 turbo. I am looking at pushing it to a little more than that. :)

Been in a few cars now with RB25 turbos and not a huge fan. Sure they are a good budget upgrade, but they arent that responsive...they dont make great power and are still fragile.

I have been in a few RB20s with 2530s and they are clearly better.

Just play with the cam gears and pay for a good tune. 2530 can be a good thing

Hey Roy

Thanks for that mate. I went with an RB25 turbo but changed my mind due to exactly what you said, budget upgrade and they are still very fragile.

14psi is its limit, so basically no room to go any further.

No point going to an RB25 turbo then it blowing up after a few months, if that! How much boost where those 2530s running at?

just go all out and get a gt30r now.. sooner or later you will want more power.

Hey John

GT30R lol are you serious?

I was talking to a guy off NS.com who was running a GARRETT 3540R on his SR20 motor lol

The thing was full boosting about 4000-4500rpm and making 241rwkw! Now thats lag, but thats also a lot of damn power!

The guys on NS.com seem to run huge turbos on there SR20s, with some lag, but what do you expect. End up making some pretty decent power with such a small motor. Seen a few running GT30's and shit like that, don't see why we cant do that on our RB20s!

Think there was a guy running a GT30 on his forged RB20 motor in a Datsun on the forums? Ran like 10sec pass haha

gt3071r .63 exhaust should be pretty good.. if its good on a sr20 it will be pretty good on yours, just haveto deal with a bit of lag

Hey Phil

3071R you say hey. .63 would be pretty good, will have to look into it some more! Haven't had a look at the 3071R but I know a few people are running them on there SR20s on NS.com.

How much bigger is it compared to the 2871R, or is it more up there with the GT30?

Thanks for all the comments guys, keep them coming!

You have now all just given me more options to consider lol

Abu

Edited by abu
Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/#findComment-3335056
Share on other sites

But i have seen a few SR20s fail to get near the response and power that the RB20s see with the same turbo??? So still food for thought.

One thing i have found when looking at RB20 results, is even when paired with small turbos that are on song at 3,800rpm etc, they dont always make any more power then the RB20s running bigger turbos. It seems you can creep a bigger turbo on there and not suffer too much as the mechanics of the engine means the engine wont up and boogie until after 4,000rpm even if you are hitting it with 16psi before then. Just food for thought that if you are fronting good dyno time with a good tuner then somehting like a 2535 could serve you equally as well, making good power at only 14psi with only losing a few kws through the 3,000rpm range.

Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/#findComment-3335141
Share on other sites

Russman is a champ guy and pretty active in the DECA series, he runs a 2530 on his nicely sorted RB20. If you can wait until November you should come up and go for rides in the R32s entered at DECA. There is R32s with 2530s, RB25s turbos etc.

Oh really, I'm in no rush to buy at the moment. Will probably source a good priced/condition turbo from Japan as I can get parts at a good price through my cousin.

Just want to decide on a turbo first then I can look around seriously.

Might actually come up and take a look, would be keen to see how they perform!

Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/#findComment-3335354
Share on other sites

a four cylinder will spool up larger turbos faster than an equivalent sized six cylinder so i would be cautious comparing SR20 results.

Is that right? I have heard it mentioned before but thought it wasn't like a true fact, just people comparing thoughts.

Whats the reason behind that? Is it due to the size of a 4cyl manifold compared to a 6? 2 extra powers, 2 extra runner lengths.. just my thought.

Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/#findComment-3335368
Share on other sites

But i have seen a few SR20s fail to get near the response and power that the RB20s see with the same turbo??? So still food for thought.

One thing i have found when looking at RB20 results, is even when paired with small turbos that are on song at 3,800rpm etc, they dont always make any more power then the RB20s running bigger turbos. It seems you can creep a bigger turbo on there and not suffer too much as the mechanics of the engine means the engine wont up and boogie until after 4,000rpm even if you are hitting it with 16psi before then. Just food for thought that if you are fronting good dyno time with a good tuner then somehting like a 2535 could serve you equally as well, making good power at only 14psi with only losing a few kws through the 3,000rpm range.

Thats a good point, I see what your saying.

I was very close to buying a HKS2535 but ended up losing the auction as it went for more than I budgeted for. But have seen good results on RB25's with a HKS2535 and also a few R32 RB20's floating around with these turbos.

They seem to be well priced, and a decent size. Don't mind losing the power a little down low, as long as it picks up and goes strong up top.

Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/#findComment-3335372
Share on other sites

2535 is pretty sweet all rounder, but if you want any more than 240rwkw you will probably need to go larger.

My 2535 makes 240 and if and when I upgrade Ill prolly look at GT30, but I will also be doing internals then...

cheers

Hey

Yeah I am a big fan of the 2535, very nice turbo and well priced.

Are you running it on an RB20 or RB25? 240rwkw is about the max I would want to push my RB20, and thats if it makes it there.

When do you get full boost and how much boost you running to get it to 240rwkw?

That is more than enough power for me.

GT30 is available in internal gate yeah? If so, might be something to consider getting I think..

Edited by abu
Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/#findComment-3335376
Share on other sites

I've got a HKS GTRS and i'm very happy with it. Full boost about 3800rpm. You can get them new for around $2300 now.

Hey

Yeah I am also a big fan of the GTRS. I have read so much positive feedback about this turbo, they seem perfect almost.

Everyone that I have talked to who is running a GTRS has said they are awesome, come to think of it, I don't think I have ever heard a negative.

I think there a bit cheaper $2,300 now too, but do you know what sort of power they are good for on an RB20?

Edited by abu
Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/#findComment-3335377
Share on other sites

Troy you seem to get very good results by basically sizing the turbo UP and running the engine in a higher rpm range than stock - correct? Over time there have been no shortage of comments about the RB20 and its ability to reliably cop 8000rpm.

Basically if this is what it takes - to either hold or increase torque at higher rpm then you clearly get more power.

The idea is nothing new and should work great (just don't expect much to happen under 3000 for argument-sake) provided your gearing allows the engine to perform at sane road speeds and make use of all gears.

Taking that approach, using a larger turbo makes good sense. The owner should just be prepared to make vigourous use of the upper rpm range just like a Honda VTEC owner would.

It seems you can creep a bigger turbo on there and not suffer too much as the mechanics of the engine means the engine wont up and boogie until after 4,000rpm even if you are hitting it with 16psi before then.
Edited by Dale FZ1
Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/#findComment-3335403
Share on other sites

Troy you seem to get very good results by basically sizing the turbo UP and running the engine in a higher rpm range than stock - correct? Over time there have been no shortage of comments about the RB20 and its ability to reliably cop 8000rpm.

Basically if this is what it takes - to either hold or increase torque at higher rpm then you clearly get more power.

The idea is nothing new and should work great (just don't expect much to happen under 3000 for argument-sake) provided your gearing allows the engine to perform at sane road speeds and make use of all gears.

Taking that approach, using a larger turbo makes good sense. The owner should just be prepared to make vigourous use of the upper rpm range just like a Honda VTEC owner would.

Thats an advantage or using a larger turbo, its not always on boost, you save fuel but when you need the power you just hit the gas and your away.

I think the bad thing about a large slightly more laggy turbo is that, once you do hit that 3500 - 4500rpm and make full boost, its instant wheel spin almost. Bit hard to keep that power to the ground, but I guess thats the same with a quick spooling turbo, but you will just get wheel spin really low in the RPM range.

Edited by abu
Link to comment
https://www.sau.com.au/forums/topic/184119-rb20-turbo/#findComment-3335412
Share on other sites

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

    • I got a full sheet set of OEM copied stickers to replace all the faded engine bay ones, great quality too.  Came from England. Someone like that should be able to to make u up what u want so long as u have a quality image to show them 🤷🏻‍♂️
    • 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).
×
×
  • Create New...