Rb20 Turbo.

[abu]

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.

Thank you in advance,

Abu

Edited September 7, 2007 by abu

[Taxi33]

Hey abu!

I'm pretty sure that some 2530's come t3 Flanged

http://www.hksusa.com/products/?id=704

I'd like too see you try the 2530 due too ah...

past experiances with that turbo

Haha good luck man!

Samir

[The Mafia]

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

[1400r]

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

[Roy]

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

[silver gts-t]

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

[LTHLRB]

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

[abu]

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 September 8, 2007 by abu

[Roy]

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 uo and go for rides in the R32s entered at DECA. There is R32s with 2530s, RB25s turbos etc.

[wolverine]

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

[Roy]

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.

[jnr32r]

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

[Interloper]

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.

[abu]

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!

[abu]

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.

[abu]

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.

[abu]

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 September 8, 2007 by abu

[abu]

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 September 8, 2007 by abu

[Dale FZ1]

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 September 8, 2007 by Dale FZ1

[abu]

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 September 8, 2007 by abu