turbo sizing...for a 2liter BMW engine
I am a newbie to the world of turbos but have been reading and learning a lot.
In the process of building a turbo engine for a 1970 BMW 2002...it is a 2 liter engine, 8.5:1 compression, and a 292 cam. I am wondering what size turbo I should run. Just a t3? maybe a/r .48 range or should I be running a hybrid t3/t4 style turbo. I am looking for around 190/200hp (car stock is about 110 at the crank) with redline at 6800. I don't plan to run HUGE boost, probally in the 7-10psi range. If 200hp is not achieveable with that I will be ok with less power....looking for smooth reliable power. I would like a nice smooth power band, 3k(2500ish) to redline would be great. I will be running megasquirt with edis igition...so I will have full control over fuel and spark. Also will be running a air to air intercooler (15" x 13" x 3" range...) What would you all suggest? I am interested in both new/rebuilt and used. If anyone has something that fits my motor please contact me. TIA, Jake '70 BMW 2002 '89 BMW M3 |
Re: turbo sizing...for a 2liter BMW engine
is it an inline 6? and that compression ratio is made for boost. t3/t4 sounds good but your hp goal is low so a t3 is alright and btw, read this https://www.homemadeturbo.com/forum/...?topic=37464.0. now post pics of what you're working on
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Re: turbo sizing...for a 2liter BMW engine
Nope...this is a 4 cylinder...
RWD... info on the car... 1970 BMW 2002 H&R sport springs Bilstein sport shocks adjustable front camber ...coming soon new engine bigger sway bars front strut bar 5 speed trans 3.91 lsd rear end upgraded from a open 3.64 oh yeah...a turbo! So it should be fun. Thanks for the link...I will read and do some math. What are the advantages between just a t3 and a t3/t4? Jake... here is a picture of the car before the suspension changes. This car also went through a 16 month body restore. http://theguestroom.net/car/11-07-04/02right.jpg |
Re: turbo sizing...for a 2liter BMW engine
Originally Posted by jdm monkey
is it an inline 6? and that compression ratio is made for boost. t3/t4 sounds good but your hp goal is low so a t3 is alright and btw, read this https://www.homemadeturbo.com/forum/...?topic=37464.0. now post pics of what you're working on
p.s. i love how the exhaust is in the middle |
Re: turbo sizing...for a 2liter BMW engine
2002's are awesome :y For your setup a regular cheap T3 will work well and the .42 .48 would put you near your spool up times.That or a DSM T25 will def spool that quick and probably hold on till 65-6800.The T3 is nice as a upgrade in the future means just swap out turbos and not changing flanges etc.
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Re: turbo sizing...for a 2liter BMW engine
Originally Posted by zex_cool
its a four cylinder, my old neighbor has one. T3 42/48 would be a good match. T3/T4 ?? i think that would be way to big.
p.s. i love how the exhaust is in the middle |
Re: turbo sizing...for a 2liter BMW engine
Sweet car. I love old schools my neighbor had one and I wanted to buy it when they were moving out but he brought it with him. Its funny how you mentioned it went through a 16month restoration and I just noticed the driver side door iswaay off. t3/t4 turbos are hybrids which have a t3 exhaust housing and a bigger t4 compressor housing.
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Re: turbo sizing...for a 2liter BMW engine
The hood was open a little in that picture....the reason the door looks "off"
So just a standard t3 would fit what I need? jake |
Re: turbo sizing...for a 2liter BMW engine
the hood was open? how does it open back to front? looks like its shut to me.
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Re: turbo sizing...for a 2liter BMW engine
Perfect turbo setup would be anything from a 1986-1993 Saab 900, which had similar stock CR. Try to find a water-cooled turbo from the later years, because regardless of what you'll see here, you WANT the extra cooling capacity. (I'm not a believer in the whole cheap-as----- ghetto turbo philosophy. I like to do it once and do it right.)
You should have enough room for a smallish Saab Blackstone intercooler too.... Good thing is that these are REALLY plentiful. You can run a bit more boost than you think with that low CR, so a T25 might be perfect...A T3/T4 hybrid has more top end, but takes longer to spool. Since you have to fab up oil and water lines anyway, you might consider a later Mitsu unit, a TD04HL that spools even faster than the Garretts. You'll have the ultimate sleeper.... |
Re: turbo sizing...for a 2liter BMW engine
Originally Posted by 4g63t_EGMonster
the hood was open? how does it open back to front? looks like its shut to me.
Yea, those open from the windshield towards the front. They have a neat pivoting system on the front. |
Re: turbo sizing...for a 2liter BMW engine
I had a IHI Rhb5w .42/.48 on my m10 (1.8 liter same difference) for a little while. It spools up really quick which is a plus but no balls up top. Its good for 170 -180 hp. I have gone a little nutty and since decided to go with a .60/.63. We will see how that goes, lol.
Search for my screen name to see pics of my old setup. BTW, 2002's are the ----. |
Re: turbo sizing...for a 2liter BMW engine
If that engine is the same as the 2002 turbo engines then it can take a beating.
They only made about 1670 ish of the turbo models back then. I think They used the engine in F1 also..when they ran with turbo's. I would go with a t3 if that is your goal, but as I always say...you will want more after you get used to it. Get your wallet ready ;D |
Re: turbo sizing...for a 2liter BMW engine
Yes it will be a sleeper. It will look just as it does in that picture...well a little lower than that now.
When you had the .42/.48 at what RPM were you at full boost? When did it level off? I think the .60/.48 would fit what I want to do best. What are the specs on the saab 900 turbo? I don't want to run huge boost becasue I would rather have things more balanced and not cause to much stress on the rest of the car. jake |
Re: turbo sizing...for a 2liter BMW engine
Nice car, I'd say a 48/60 off a T-Bird.
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Re: turbo sizing...for a 2liter BMW engine
Full boost was around 3500 rpm. I was pushing 10 psi with a basic FMU setup.
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Re: turbo sizing...for a 2liter BMW engine
hx40
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Re: turbo sizing...for a 2liter BMW engine
HX40 will start pushing boost around 6k, if your lucky. LOL
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