Turbo size for M20B20

[Donnie]

ok first of all, no I am not going M20B25, I verywell realise this to be a superior motor for making shit loads of power, but I have a M20B20 wich I will rebuilt, and I dont wanna break the bank on this one to much, I am going to use a stock head gasket, some metric blues and keep the CR std, I will be wanting to run 0.5 - 0.6 bar

So what size turbo would you guys recommend and also where will it start spooling

BTW some of you might remember I was gonna supercharge it, but over here turbo parts are more common and easier to come by, and like I said, I dont wanna break the bank....to much, just built a nice and neat Turbo inline 6 2.0L

[Ant]

for the 2 litre a stock sierra cossie spec T3 will be perfect, I have a T3 hybrid on mine with slightly oversized turbine and compressor wheels , spools at around 1.8K rpms and full boost from 2.2K onwards, maintains the set boost right through the rev range too

HTH

[Donnie]

for the 2 litre a stock sierra cossie spec T3 will be perfect, I have a T3 hybrid on mine with slightly oversized turbine and compressor wheels , spools at around 1.8K rpms and full boost from 2.2K onwards, maintains the set boost right through the rev range too

HTH

You have a turbocharged M20B20? any specs on it ? Yeah I was thinking T3 aswell and the spool ranges sounds pretty good

[Jon_Bmw]

As ant says t3 cossie turbo would seem like the obvious choice. Plenty of them about and on egay. You could then use a 524td manifold with porting to bolt up to the head and turbo.

Have you thought about fuel issues as its still stumping me, but i've got another plan for tomorrow.

[Ant]

To fuel the turbo is easy enough..... decide what boost you want to run, be realistic, sont spend Ԛ£Ã”šÃ‚£ and time on a 5 Psi setup if you really wanted 12 psi.

you can use M30 535/735 yellow injectors with RRFPR without any real issues up to 7 psi, anymore than that you'll need an aftremarket ECU.

Myself and Mark( fozzy) opted for the Bowling and Grippo Megasquirt range, otheres went for the UK built Emerald setup

biggest thing is, what do you want, evertything else can only fall into place after you set your goal

oh, and I have the T3 hybrid on B25 with MSnS-E and a wideband 02 for tuning purposes

[Jon_Bmw]

you can use M30 535/735 yellow injectors with RRFPR without any real issues up to 7 psi, anymore than that you'll need an aftremarket ECU.

Ant how do the rising rate fuel regulators work, do the raise fuel pressure by 1 bar for 1 psi of boost they see, as 2psi thats quite alot more fuel, or have i got my wires crossed.

My vortech rasies at 12:1 ratio, starting at about 4 psi, but its not enough on standard injectors, the 535 ones are going back in tomorrow and i'm gonna tighten up that AFM spring.

[Ant]

ah , forgot you were running an FMU, I'm sure you can change the insert in the Vortech to alter the rising rate, sounds like with some yellows, a spring tweak for idle and an 8:1 ratio would work well.

Why not swop to MS dude ? ( recruitment mode enabled )

[Donnie]

thanks for the replies guys, any input from the 320i club "731" I believe?
Any other input ?
btw, picking up my intercooler tommorow

[johnono]

nah, the 731 boys are purist scum

[Jon_Bmw]

ah , forgot you were running an FMU, I'm sure you can change the insert in the Vortech to alter the rising rate, sounds like with some yellows, a spring tweak for idle and an 8:1 ratio would work well.

Why not swop to MS dude ? ( recruitment mode enabled )

Stop tempting me ant, i would sooooo love to but its money, i'm becoming a student at bristol in 17 days time so money is very tight, considering i've had 4 months off with no income. Savings get spent quick!

Tomorrow, or today now even, i'm changing the injectors to 535 ones tweek the 'flow meter tighter, see what happens i hope it doesn't foul the plugs, don't want another 3.5 hour job changing them again.

[320Touring]

thanks for the replies guys, any input from the 320i club "731" I believe?
Any other input ?
btw, picking up my intercooler tommorow

get a turbo on it-the 731 head is less likely to blow than the supathin b25 head

good luck with the conversion

[Chaos]

personally id say try a T28 from summit like an s14 200sx or pulsar gtir.

u'll get better spool up with it than a T3, and it flows for 300bhp no worries

[Donnie]

I can get a brand new T28 for a pretty neat pricve right now, if it's not already bought, otherwise I'l go for T3, they are plentyfull, anyone elses opinion on T28?

[Donnie]

Also can anyone estimate a power figure on .6 bar on the M20B20, intercooled, and for shitss and giggles .8 bar

[Turbo-Brown]

I'd have thought something like a T25 or T28 would have done the trick, depending on how much power you're after.

Also, you can get a dual ball bearing GT28R from the states for like 5 or Ԛ£600 iirc

[Donnie]

well I'l be buying a Garret T28 somewhere this month, when I got all the stuff I'l put up some pics, I am looking for around 200hp @ 0.6 bar + Intercooled , realistic? And I'l sell my 6 branch and have a tubalar turbo mani made up, high polished silver

[Turbo-Brown]

Yeah sounds good to me. The 320i was 130bhp(ish) to start with wasn't it?

Keep us posted!

[Donnie]

Yeah sounds good to me. The 320i was 130bhp(ish) to start with wasn't it?

Keep us posted!

Yeah sure, yeah it's around 130, 148KW(200hp) would cook rather nicely in a E30, secretly I want 220hp but hehehe, I'l keep that a secret