RB25 s1/s2 vs RB25 NEO turbo - differences?

[nelsonmxmarc]

wow, stock option is a .5 compressor housing? Nice they give the added option of a .58 or .63 housing. 48 trim, as well. Quite an original setup.

Would be nice fitted to an adjustable actuator, this turbo has some serious potential. Not sure how shipping would fair but i can only assume it'd be at minimum quarter the value of the turbo itself lol.

The pics are of an internally gated turbo, but where is the gate? Looks capped off from what i can see.

[nelsonmxmarc]

International freight; 60$.... This is looking good mate! I'm definitely going to spend some time reading up on these. Good find, appreciate it.

[Skym]

I presume that's with stock cams, which is impressive. Looks like it has a internal wastegate option with V-band clamp (I gather you need a custom dump pipe, custom water, oil feeds).

Says full boost (16psi) at 5850rpm on RB20DET, according to RB20DET boost graph -

http://dsrturbo.com/product_info.php?cPath=24&products_id=78&osCsid=7e51ccd07e76907c77877c2b7a3c68ce

228.6kw at 6353rpm on power graph with just fuelpump upgrade (stock injectors), ECU retune, front mount intercooler, intake, exhaust (I would assume they have a adjustable FPR as well). 96 octane fuel?? Maybe they mean 98 octane???

With Tomei Poncams (extra 24 peak hp at same boost level), that's a 395hp RB20DET engine at 16psi.

[nelsonmxmarc]

Says full boost (16psi) at 5850rpm on RB20DET, according to RB20DET boost graph -

I'm hoping that's with a .63 Ar turbine housing.. As a 48 trim compressor wheel would probably better suit something like, .58 compressor housing or less, matched to a .58 a/r exhaust side. That should alleviate the lag and still be able to produce around 300 whp.

Turbo fits factory oil & water lines on Nissan Skyline

so that's not a worry..

Dump pipe, perhaps not entirely drop in. I'll have to request more pictures or information directly from DSR as i still dont fully understand how the gate opens. I'm assuming the exhaust out chamber has some depth, and the gate opens 'down' into that? rather than the standard gate which is visible form the rear of the exhaust housing?

[nelsonmxmarc]

I guess we should take into account this setup is strictly for drift, as the company name implies.. So high rpm spool like they show with the rb20 is probably suitable for those cases. I'll have to get some info from them and see what they recommend.

[DrMango]

keep us updated please nelson. Im quite interested in this turbo if it ends up looking like a good option. If you end up buying one let me know, maybe they can work out a deal on 2. I like what i see.
I had a shop in alberta that said it would be no problem to rebuild one of my spare R34 RB25 turbos but he hasn't been calling me back so im pretty much giving up on him and looking at new..

Kyle

[nelsonmxmarc]

keep us updated please nelson

no problem. I will hopefuly have more news by the end of this week.

I have, in the mean time, found a steel wheel RB25 NEO, Garrett built ball bearing turbo for about 750$ shipped USD.. I may pick that up if all else fails but i'd rather do something original and try something from an up and comming reputable company.

I'm hoping they can tell me i'll have a lower spool with a .58 ar turbine housing, as 5500 something rpm is way too high for what i'm looking to apply it to. What gets me is that its a 48 trim compressor wheel, which imo, is insanely small.. Likewise, the 25/30 is 63 Trim - 47.7 Inducer with a .64 A/R.. This typically hits full boost at around 3300 rpm on avg, which i'm hoping to get around as well..

As long as i can comfortably see 300-350 whp with a full spool at 3-3750k rpm, i'll be smiling.

Anyways, we'll find out shortly i guess!

[nelsonmxmarc]

DSR Replied - A+ on speedy e-mail turnaround lol

Turbo used was a litle Lrge using the .63 housings. He'd had this Trbo for sometime before i got the New G2, in .58. He alo had a very big intercooler to big for the job. If you can only make under 250kw you dont need a 3-400 kw Intercooler.

No to the OEM Dump pipe Question (is there a fitment for a 6 bolt , oem dump)


Regards,

[nelsonmxmarc]

Latest reply;

I think with the .58 Housing on the car should drop by 250RPM using my head math device. ( over the .63 )

It comes down to Tune. We have developed a DSR430 Rb20det Chip. But we need another car to check it on ( standard )

A Standard rb20 using standard Injectors cant really push Past 230kw with the Turbo. With cam gears maybe another 10-11KW Gain ( i am not a Tuner so cant confirm

If you want big power from a RB20 You will need Cam Shafts. This could give you a good 15% more go.

Wheel is not steel.. Steel is cheap and flexis under heat and stress throwing off balance. DSR Use Inconel Same as Garrett. None magnetic.

Internal (wg)? a V-band is used ( comes with Turbo Free )

DSRTURBO Is the best Sold Turbo in NZ. For Value, cost and ability

[nelsonmxmarc]

Lets talk V-band vs non.

This is my first encounter with a v-band housing, any pro's, con's to this as opposed to the standard housing setup with internal wg?

Where does the gate dump?

Guess this means molesting my brand new split, dump/down pipe with divorced waste gate? Lol




Edit;

As i look at the pics, i'm assuming the v-band fitting is removable, and reveals what looks to be a standard 5 bolt exhaust flange with gate?

http://vibrantperformance.com/catalog/product_info.php?cPath=1022_1035_1067_1123_1155&products_id=1582

Fitting something like that to my a/m dump ? ( i know the size isnt correct but just for visuals)

[Skym]

The swing valve assembly bolts onto back of turbo in photo above (has the wastegate flapper built into it).

Swing valve assembly -

http://www.frsport.com/images/detailed_images/ATP-WGT-023.jpg

Can see swing valve assembly installed on turbo in this photo -

http://dsrturbo.com/images/430ia.JPG

On exhaust side of swing valve assembly, there's a V band flange. On entry too dump pipe there's a V band flange. Put the 2x V band flanges together and V band hose clamp goes over both flanges, holds them together. Then you lock the V band clamp.

It looks like this when both pieces are locked together with V band clamp -

http://www.turbosystem.com/Quick%20Release%20V-Band.JPG

Makes it easier to remove exhaust when replacing turbo or removing engine (quick release).

[nelsonmxmarc]

Seems almost as inefficient as the stock dump pipe on the rb20? Technically its just channelling waste back down the shortest route to the exhaust dump.. It's contradictory to the idea that a divorced wg or even an atmospheric wg dump is 'most ideal'..
It's going to disrupt exhaust flow but is there a reason? Increased back pressure? Maybe has something to do with using such a small trim turbine wheel?..

Any way this swing gate assembly can be massacred into a proper 5 bolt flange for a standard dump/downpipe with divorced wg?

Thanks for the info Skym, again, appreciate the help. I'm hoping to grab more info from the boys at DSR, they've been great so far. Price can't be beat either as our $ to NZD$ is about 500$ shipped for that turbo..

[DrMango]

realistically with all this new info and such, what kind of spool do we expect with this turbo? still in the 5k+ range for 16 psi?

Kyle

[nelsonmxmarc]

Id say, with their optional .58 a/r turbine housing, i'd ball-park around 500 rpm less than what we saw on THEIR dyno sheet (Using same car etc). Thing is, as DSR said in the email i posted, his intercooler and tune we're not setup properly for that specific turbo. With a proper tune, and decent sized intercooler (2.5" piping, something smaller than an OEM GTR IC) i'm hopeful we could see 3800 to 4000 rpm full spool @ 16-18 psi. At around 18, its likely to see over 320 whp, as with just a slight tune (rough tune at that) and fuel pump, on 96 octane pump gas, they were able to make about 219 rwkw, which is actually pretty outstanding.

Not to mention, they've managed 3300 rpm spool on an rb25.. Which actually beats me, since in theory both turbos were identical? So maybe in the end, the tune will decide how well this turbo performs.. I'm hoping to go to Almasi this spring, and if in fact i do go with this turbo, i'm hoping things will be mid to high 3's in terms of lag.

I'm also porting the head, exhaust manifold runners, exhaust manifold, intake runners and intake plenum.. As well as gasket matching and etc... So flow should be optimal for my little RB20, which is still upwards of 145 compression on the board..

hoping to see good numbers.. I'll try to make my decision this week about the turbo setup and try to arrange something with them asap. I'm just worried about switching BACK to a, what seems to be, stock arrangement with the waste gate swing valve... i'm not sure i like that idea.

[DrMango]

I have a rebuilt motor to run it on with the same dump problem that you have. I had planned to run my 24x12x3 FMIC with 3 " piping but i guess i will likely be running a 2.5 " FMIC/pipe setup if i want to keep the lag to a minimum. I would like to see if i can achieve a 3800~ RPM spool time. I am very interested in the quality of this turbo though as that will be the deal breaker.. price is right though so im still onboard

Kyle