NefMoto

So I am back again. My audi is sold and now time for new project. Audi had GT2860RS original. Was decent, but this time i would like to have something bigger.
New car is VW Golf4 4 motion 1.8T 6  speed . I myself was thinking 3076 or bigger or some chinese turbo with name. All suggestions are appriciated.
My goal is 500ish hp.

Borgwarner s200sx/s257sx

https://pulsarturbobenelux.com/products/psr-5449g-aka-g25-660-dual-ball-bearing-turbo

G25-550

g25-550 not possible 500hp 1,8t
good day 440

660 >520-540

garrett figures are not for pump gas

you have to substract 100hp if you run good pump gas

660 --> 560 real hp

G25 are amazing turbos work very well on 1.8L but like other said they are lil bit overrated.

Also you would be surprised at some of the holsets (combinations), specially in twinscroll you can get ridicolous boost at g25 spool levels.
Obviously the transient response is not for track but yeah.

BW s200sxe the smaller variant is also a good option for budget builds and crazy power.

Really your choice all comes down to your target and budget and hardware limitations such as oil cooled only or water too etc, all setup dependant.


Now as for OP, do not get the 3076 its not the best match, 3067 maybe,but really a 2867 but you need to custom build that iirc

Thanks for answers. Will look into these turbos. I think acceptable full boost would be at ~ 4-5k rpm. As i have tested already 2860rs ( which is very good turbo ), this time i would like to have more play room.
Doing research early. Just finished conversion with k03. But in Europe its kinda impossible to log on the road right now, we have big snow storms .

4k rpm 500hp forget it, if not running exotic fuel.
Above 4.5k for sure, and you need full launch control and flatshift.
You also need to build the valvetrain, so you can rev to 8k, else there isn't enough room for 1->2 shift.
Not to mention the complete lack of transient response.

1.8T 500hp is only useful for drag race. If you have to "log it on the road" then you won't even be able to tune it correctly.
Dyno is needed to load it properly at low rpm and test with long enough pulls.

On the road every remapped 300hp 3.0 TDI will be faster than you in 95% of situations.

It makes my ears bleed when i hear diesel will be faster

Sure, but if you got a big turbo 1.8T you will be/ or want to be in your powerband when the 3.0TDI is in power too, you wouldnt be racing it sub 4k-5k.
If you driving it in cruise then yes obviously there is no replacement for displacement and diesel, what he means.
But a 500 HP 1.8T will destroy the stage 1/2 3.0 in the powerband obviously.


That said for my next project I want to go big turbo 3.0TDI v6 or M57 too , try something new. The MPG is not comparable obviously(that said with 3L tax you come out the same / year here :)) )

So you want to sit at every light in full launch control?
I want to see that.

Also, no, it's not just power band.
If you just floor it at 5000 it will take ages to spool still.

So you need rolling antilag etc.

I don't see any point in this.
Only if you have some class of drag race where you are limited on engine size.
Building this for street is dumb. I mean 30BTD with remap makes over 400 hp and shifts every shift perfect.
And those cars already cost below 20k at this point.

It's not 2005 anymore.

1.8T is pretty decent up to 400hp, especially with DSG. Everything after that is an excercise in futility imo, unless you are making a dragster or a dyno queen. It is undrivable in other situations.

2.0 stroked with k04064 and dsg gives you much more emotions in city driving than 1.8t with BT and manuelle )

Holsets are diesel turboes. Theyre gives you boost but not flow and especially response with hx30+ models
The only reason to fit them is a budget

Okey boys. My point is, I want the feeling where boost comes and i feel it. Something like here : https://www.youtube.com/watch?v=DHIBBnKzX4A . With 2860rs I did not get this emotion. Most of the time I drive with high rpms . I understand it is not 2005 anymore, wheres the 1.8T is only best engine, but its cheap, its cheap to tune and it gives some nice emotions and when it brakes, there is nothing to cry about.
If i bought for example ford focus RS for tuning purpose, hell lot of money to build + not so much proft from stock hp wise. And when it makes boom, it will be kinda sad. ( This car is only a example ).  Maybe I have not found the "right another one", thats why i chose 1.8t .
Also its nice to play with ME7. And diesels I hate, whatever power they make, its diesel.

It's not if you like or hate it.
What's the point of building something that is slower than 3.0TDI?
There really isn't.

Use a modern 360-400hp turbo or pick a larger displacement engine.
On the street the 500 or 550hp 1.8T is much slower in 90% cases than a 400hp one.
Once the turbo is way too big it's not enough to be at the RPM anymore, it takes ages to spool even a BB turbo with light shaft. The transient response goes to the dumpster.

in almost every case, a 1.8t is garbage by modern standards, especially considering how cheap 2.7t blocks are. Why would you bother?

Well, for one. Fun cars for little money. I've got my 1.8 20VT4 up and running and currently busy getting my map right.

With the Haldex, GTX2867R and built engine it definitely gets a smile on my face.

What about making a plate to adapt T3 manifold to the IS38 golf r turbo? Pretty sure its good for at least 30whp more than K04-064 and could be picked up reasonably used??

Why not just take the IS38 golf or seat cupra (even cheaper) in the first place? They're not that expensive anymore.
By the time you're done with your 1.8T build, DSG etc, you probably will spend close to as much as it costs...
I'm all for building fun stuff, but when the thing you want literally already exists and it costs about as much as you would spend building it (and it works better), then no point to build.
If you want to swap it into something, there's S18 immo off solution on my site. There's several Mk1 Golfs driving around with that solution and the Golf R motor, and that does 370hp bone stock with just a remap and 500hp with just a turbo upgrade, with acceptable spool. DI and adjustable cams/lift do wonders.

This applies pretty much to every engine. From a certain turbo size it's not usable anymore outside of a straight line with launch control and NLS.
It's a good idea to stop way before that happens, as after that you're making the car feel worse and objectively slower in most situations.

In the US 2015 Golf R's with north of 100,000 miles on them are priced at least $25k. AWD in a VW car over here is rare and stupid money  :(     Good to know about the S18 imm off solution though.

So looking Garret  compressor maps and keeping in mind 1.8t, it seems to maintain some driveability + alot supporting mods 3076r should be complete maximum.

So
Whats the point you asking?

Discusson.

Well... This thread is a total waste of time lol. What a fucking circle jerk.

Well.. One thing is to read compressor maps other thing is experience from other users. If you have nothing to share, whats the point of writing here?

No it would not be. 3076 on 1.8T is not drivable outside of a straight line. Even on 2.2T it was a little past the limit of what was comfortable.
And why discuss 20 year old turbos?

EFR 6258 or max 6758 for 1.8T. Everything bigger pointless imo.

Thank you. Examples were that i was waiting.