How suitable is this turbo for my S2?

[karlblues2]

Hi Guys. This link refers to another thread recommending this turbo over an RS2 turbo. http://www.034efi.com/catalog/produc...products_id=45
Can someone please explain whether it is a good replacement to the S2's K24 on my ABY or whether I should stick with an RS2 upgrade through VAGPARTS Any help on explaining the benefits and disadvantages of each would help me lighten my wallet in the right direction
Kind Regards
Karl

[S2 Ant]

Sounds interesting esp if its a direct fit

[Paulm]

Yeah will be a direct fit, I was going to buy one of these before I found an RS2 Turbo, This guy is very helpful and will ship to this country at lower value in case you get stung by export duty. only prob is you will need a custom map for this turbo. I wanted a generic 1 from PaulN so waited for the RS2 turbo.

Paul

[horvathg]

Yeah will be a direct fit, I was going to buy one of these before I found an RS2 Turbo, This guy is very helpful and will ship to this country at lower value in case you get stung by export duty. only prob is you will need a custom map for this turbo. I wanted a generic 1 from PaulN so waited for the RS2 turbo.

Paul

I've never heard about this website. Interesting things there. Anyone has experience with these? eg. the oil ducts.....

[nickhey]

Looks very similar to my recently installed Garrett GT30 roller bearing, except without the roller bearing.

Oil / water hoses will need to be modified to suit.

I am running mine with an MTM map until Saturday, when Mihnea is doing a re-map. Comparison as it stands against the original RS2, would be that response is much improved / lag reduced.

I'll post a before ( RS2 / MTM map ) and after ( GT30 / Mihnea map ) dyno plot next week for those interested.

I paid around £1000 +VAT for the GT30, with an RS2 spec unit costing £700 +VAT( from Turbo Dynamics in the UK ).

I would recommend paying the extra cost over the original if possible, as the GT30 has scope for higher boost levels over the original RS2, without any significant increase in lag.

[S2central.net]

Yeah will be a direct fit, I was going to buy one of these before I found an RS2 Turbo, This guy is very helpful and will ship to this country at lower value in case you get stung by export duty. only prob is you will need a custom map for this turbo. I wanted a generic 1 from PaulN so waited for the RS2 turbo.

Paul

This looks like a good concept alright - with the K24 hot side minimising lag, but of course limiting ultimate top end - so a good compressor match is required.

Let me get a look at the compressor map first for the T04E 54trim.

As I understand it, the Garrett T3 centre section means you will need to modify coolant and oil lines.


Paul

[S2central.net]

Well based on a very quick look, and making various assumptions like -

Pi = 2psi
Pf = 1psi
Ambient Temp = 20 celsius
Ambient Press = 1020mBar

and VE between 85-90% I think this turbo can be used with some care. Boost must be limited carefully in low revs to prevent surge. Running close to the surge line I don't see serious boost (1.2bar) until 3500rpm. It can then hold 1.6 all the way to the redline. Realistically you would probably tail off boost at the limit because you are going to need a might good intercooler to keep air temps below 40 celsius when flowing 45lbs/min.

Of course you could run even higher boost between 5000 and 6000 making use of the useful 'bump' in the compressor map. This will create a mighty wave of torque in this range.

I'd need to do more sums estimating torque and power for such a boost profile, but gut feel says this turbo has the potential to bend stock rods.


Paul

[S2central.net]

Actually it may not be the potential rod-bender I had first guessed. Max torque is ~450Nm. Check out the plot from the estimated numbers. Its based on a boost profile that runs 1.7bar from 4500-6500 approx.

This is a potential 400bhp+ turbo on the S2 assuming a jolly good intercooler.

Power estimate is based on a complex calculation I shan't bore us with here, but it turned up an interesting observation when I was number crunching. I'll discuss the numbers game elsewhere...


Paul

[APNess]

That turbo looks impressive. Love that flat torque line. Would an RS2 intercooler and mist spray do the job of keeping it cool, or are you looking at one of the wider deeper i/c that are appearing on some of the cars on the forum?

[Erikb]

Would this turbo be a direct replacement for the rs2 turbo?. Can you use the rest of the rs2 parts (EM, injectors, intercooler etc.) with it.

[S2central.net]

1st off - please don't take my spreadsheet calculations as anything more than estimates - albeit based on solid mathematic foundations but assumptions like VE and IC efficiency need to be considered thoroughly.

This turbo in question bolts straight onto an S2 or RS2 manifold, but the gotcha is the $300 kit of coolant and oil lines as the Garrett centre section is very different from KKK one.


Paul

[nickhey]

Hoses shouldn't be too much of an issue.
I got the local Pirtek outfit to TIG weld some new fitting on to the original oil hard pipe sections, and then swage some new braided lines onto that.
Water hoses are a simple hose-clamp onto the cutdown original hard pipe and nipple on the block.
Cost of suitable kit from Turbo Dynamics to suit the Garrett centre section is £40, plus around 40 for the hoses.

1st off - please don't take my spreadsheet calculations as anything more than estimates - albeit based on solid mathematic foundations but assumptions like VE and IC efficiency need to be considered thoroughly.

This turbo in question bolts straight onto an S2 or RS2 manifold, but the gotcha is the $300 kit of coolant and oil lines as the Garrett centre section is very different from KKK one.


Paul

[nickhey]

Hoses shouldn't be too much of an issue.
I got the local Pirtek outfit to TIG weld some new fitting on to the original oil hard pipe sections, and then swage some new braided lines onto that.
Water hoses are a simple hose-clamp onto the cutdown original hard pipe and nipple on the block.
Cost of suitable kit from Turbo Dynamics to suit the Garrett centre section is £40, plus around 40 for the hoses.

PS: I don't work for Turbo Dynamics. I bought the turbo following a failure of the RS2 unit supplied by one of their competitors. I was in the position that I had to shell out at least £700 so the I figured the extra £300 was worth while for the extra performance quoted.

[Billman]

@S2Central.net

Can you please make some calculations like these above for the Garret GT35R Turbo??

Greetings

[S2central.net]

Perhaps some time this week. The maps and stuff are on another computer...