What turbo shall I get

Mike@Rentech · May 5, 2004

At the stage now that I need to start thinking about what turbo to get for my 172 engine project.

Any suggestions as to what type/size to get?

Seems to be such a large selection around Im a bit baffled!

stan* · May 5, 2004

depends wot sort of boost ur planning on running..........how for u actually want to take it....

Mike@Rentech · May 5, 2004

Hoping to run around 10 to 15 psi boost, engine will be sorted out ok but would a T3 be ok?

BenR · May 5, 2004

T3 too big.

Mike@Rentech · May 5, 2004

cheers BenR, was hoping you would reply as you seem to know ya stuff m8, so what ya recon then?

BenR · May 5, 2004

To reall make an informed decision, knowing what manifold pressures your goingto be running, flow, psis cam profiles etc etc is all needed so i can look at some compressor maps to get a half decent idea.

Or you could just plump for a normal T28 or something.

stan* · May 5, 2004

itll defo give u that boost.

A/R ratio determines how well the turbo will perform with respect to boost and response.

dunno wot would be suitable tho, as proper testing needs to be carried out to determine mass flow rates using temperature and pressure ratios to "match" the turbo to the engine.

BenR · May 5, 2004

DUnno who supplies the AR ratio for the hybrids......i guess the manufacturer should know, never seen it advertised though.

Mike@Rentech · May 5, 2004

Looks like Im gona have to go for the Megane 225 turbo or something like that then, was hoping to get something a bit cheaper

stan* · May 5, 2004

if u ask they r bound to know......surely!!

BenR · May 5, 2004

mitsubishi ones area quite good.

BenR · May 5, 2004

ooooh......evo 6 ones would be awesome.

riplash · May 5, 2004

Is it more economical to buy a reconditioned turbo (or am I talking out of my arse) ?

Mike@Rentech · May 5, 2004

Rite thanks lads, Im gona have a look at prices now, the bit that hurts

Oh ben, how the hell do I get that lovely mirror finish on the alloy parts I see so much on the forum, I really wana polish everything as much as possible.

stan* · May 5, 2004

Quote: Originally posted by riplash on 05 May 2004

Is it more economical to buy a reconditioned turbo (or am I talking out of my arse) ?

as long as its done properl i.e. balanced etc....itll be fine

RS-Steve · May 5, 2004

Quote: Originally posted by stan* on 05 May 2004

Quote: Originally posted by riplash on 05 May 2004

Is it more economical to buy a reconditioned turbo (or am I talking out of my arse) ?

Click to expand...

as long as its done properl i.e. balanced etc....itll be fine

thats wot my cousin does. if ya know wot ya want ill try an ring him!!

stan* · May 5, 2004

get a price on a recon for a T28 if u can m8.....cheers

RS-Steve · May 5, 2004

will do

BenR · May 6, 2004

Quote: Originally posted by Mike172sport on 05 May 2004

Rite thanks lads, Im gona have a look at prices now, the bit that hurts

Oh ben, how the hell do I get that lovely mirror finish on the alloy parts I see so much on the forum, I really wana polish everything as much as possible.

Rub down till your using about 1200 grit wet and dry then get it on a polishing wheel.

Mike@Rentech · May 6, 2004

Cheers ben

Paul C · May 6, 2004

i think i standard t25 should runup to 15 psi fine or even a t28 would be a bit better. go on http://www.sxoc.comwww.sxoc.com as the s13 has a 25 standard and s14 has a 28. should be able to pick one up dirt cheap off there get it reconned if needed.

Paul

BenR · May 6, 2004

Still think the EVO 6 one would be nice as its all ceramic and titainium.

jabba · May 6, 2004

T25 will give you the best compramise between spin up speed and top whack power maybe a T28 if your more after raw power, id personally rather have one that starts up quick as for day to day driving its more usable and youll have less chance of being caught out waitin for the f**ker to start spinnin!

Tom · May 6, 2004

TD05H-16G

Or a KKK unit.

Paul C · May 6, 2004

Quote: Originally posted by jabba the slut on 06 May 2004

T25 will give you the best compramise between spin up speed and top whack power maybe a T28 if your more after raw power, id personally rather have one that starts up quick as for day to day driving its more usable and youll have less chance of being caught out waitin for the f**ker to start spinnin!

Agree on the T25

Mike@Rentech · May 21, 2004

I got this one for £72.00 quid, garrett turbo 0.46 AR, hopefully this will be fine.
Its also water cooled which I have been told are more reliable

Its a recon but looks mint

http://erc.qmuc.ac.uk/cliosport/gallery/full/1085173013__100_2393.jpg

stan* · May 21, 2004

where did u get that from m8? £72? ebay??

Mike@Rentech · May 21, 2004

yes m8, ebay, I speak to the guy on msn now real nice bloke, into old fords

Fred@BTM · May 22, 2004

what size is that mike?? looks about a T25????? I have a mitsibushi turbo for mine

haitch · May 22, 2004

hey fred is ur conversion finished? u doin it urself? booked in at GDI for head n cams etc then its prob tbs for me but not fully decided so any info on conversions apart from k-tec is helpful

Paul C · May 22, 2004

£72!!! what a bargin!!!

edde · May 22, 2004

Quote: Originally posted by Fred2001Dynamic on 22 May 2004

what size is that mike?? looks about a T25????? I have a mitsibushi turbo for mine

Any your only going for 220hp? Thought the potential for the engine with that turbo would be nearer 280hp?

Are you going to show us any pics of the project then? or a step by step guide to getting round the problems as Id imagine there will be a few?

skiddusmarkus · May 22, 2004

Thats a very low A/R so will make for a good spoolup but with not much scope for topend power-youd be very lucky to see 280bhp with it-220bhp would be closer to mark with good driveability.What bearing type is it-I presume 270 degree?

What are you doing to the internals?On standard compression,most people would stick to around 7psi which should be ok for that ickle turbo.You could run a bit more(say 10psi max) with an intercooler/chargecooler or water injection.

stan* · May 23, 2004

agree with A/R ratio- but dont really think there is much need in goin 2 the extremes of water injection for 10Psi even with standard CR! even with higher levels of boost, IMO, its better to have a very efficient intercooler/chargecooler, than resort to water injection.....

Mike@Rentech · May 23, 2004

I will be posting pics soon as , but would rather post them once I have done the job.

I will be fitting an intercooler which I have at work, at the moment I have the head all done, I will post pics of this v.soon

BUTRE · May 23, 2004

T28 is the best one for the 172.

you can get the ERST S2 garrett T3 really cheap! It wont lag that much on a 2lts engine.

The bigger the compressor, the lower the ACTs. What makes the turbo lag is the turbine and not the compressor, so go for the biggest turbine you can get (up to T34 will be fine).

Dont have here the garrett datasheets to see what turbo is that. By the looks of it it seems small... way too small for a 172.
It doesnt seem to be a T3 or a T2 either.. at least the ones used by Ford on their RSTs.

skiddusmarkus · May 23, 2004

Quote: Originally posted by stan* on 23 May 2004

agree with A/R ratio- but dont really think there is much need in goin 2 the extremes of water injection for 10Psi even with standard CR! even with higher levels of boost, IMO, its better to have a very efficient intercooler/chargecooler, than resort to water injection.....

Yep agreed-its an option for those who dont want to build a custom setup though which can be exoensive.

Mike@Rentech · May 23, 2004

The turbo is off a VW

skiddusmarkus · May 23, 2004

Quote: Originally posted by BUTRE on 23 May 2004

T28 is the best one for the 172.

you can get the ERST S2 garrett T3 really cheap! It wont lag that much on a 2lts engine.

The bigger the compressor, the lower the ACTs. What makes the turbo lag is the turbine and not the compressor, so go for the biggest turbine you can get (up to T34 will be fine).

Dont have here the garrett datasheets to see what turbo is that. By the looks of it it seems small... way too small for a 172.
It doesnt seem to be a T3 or a T2 either.. at least the ones used by Ford on their RSTs.

A T34 is overkill for a higher compression engine.You want the smallest turbo that will run the boost/power you want.A bigger turbo has more lag and you wont get the benefit from it as you wont be running enough boost.It will make the car slower,even if it produces more power ultimately.If down the road you want more power,ditch the turbo and get another-it only stands you at peanuts.

To get the most from a T34 or similar youd need to further modify the engine and at least lower the CR.A T25 would be ideal IMO.

For example-Im rebuilding my engine to take 600bhp but only want 400bhp(safety margin).Ive gone for a T28 RB turbo that has a 420bhp potential as I want quicker spoolup and an ultimately quicker car.I could put a bigger turbo on with the potential for 600bhp but it would be a waste as it wouldnt be running at its optimum on lower boost and would make the car slower due to lag.

Essex_Lad · May 23, 2004

on a T3 wont a rollerbearing one help it speed up quicker meanin less lag? and then u can run more boost?

Al

What turbo shall I get

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