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[80malibu_t3]

Anyone else have anything to add to this?  Does anyone think this should be a sticky?

why didnt the pics show up for the oil cooled turbos and the oil/water cooled turbos?? i am having trouble figuring out which one my volvo T3 is.
so if you could i wold appreciate it if you posted some pics
Thanks nick

[Black85gt]

I'm having a little difficulty here. I'm in no way new to mechanics or cars but the turbo scene is new to me. I'm trying to plan a turbo build I want to do when I get back from Iraq. My problem is trying to figure out the compressor size needed to support my goals. Currently I'm running a 10.5:1 393. I know the current compression ratio doesn't allow for much boost. So my plan is to build a new engine running somewhere 8.5-9.0:1 comp to be a lot more boost friendly. How would I figure out the VE to choose a compressor size needed to make 900rwhp? I've read through the bible and have searched the topic to no avail. I don't even know the VE of my current engine since it has never been on a dyno so I don't know how much power it even really makes. Thanks in advance.

Matt

[Black85gt]

Actually I guess a better question is how would I go about figuring out what compressor size I would need to run on an engine that isn't built yet? I'm not looking for any free info as I would like to figure this stuff out for myself so I know for next time. I'm just a little in the dark here. The engine in question is going to be a 408W running probably 8.5:1 compression. I'm going to re-use the current AFR 205 heads, a Performer RPM drilled for injection, 96 lbs injectors (according to the injector size calculator) and an undecided throttle body/mass air setup. This is still in the early stages of the planning since I still have the better part of a year till I'm home. I just want to start the planning in the right direction. Thanks again.

Matt

[Kawgomoo]

why didnt the pics show up for the oil cooled turbos and the oil/water cooled turbos?? i am having trouble figuring out which one my volvo T3 is.
so if you could i wold appreciate it if you posted some pics
Thanks nick

if your turbo has 4 ports, its oil LUBRICATED water COOLED.

Oil is a LUBRICANT! the turbos are in no way cooled.

turbos that are water cooled do so to save the life of the oil in the turbo..not so much the turbo itself. though coking is a bitch.

you never have to run the water lines to any turbo...any turbo will work just fine with them just left alone as long as it has oil.

[Kawgomoo]

you neednt worry about your static compression so much.

first off, you will make more power with less boost.

BOOST DOES NOT MAKE POWER, AIRFLOW DOES!  just to get that out there.

if you have a higher compression motor you will have more exhaust energy and should be able to spool a slightly larger turbo sooner than the same motor of a lower static compression.

also, static compression doesnt mean shit..if you  have wild cams your cylinder pressure may actually be very low, or the profile far from ideal for boost.

when you choose a turbo, in my opinion you need to have these thigns in mind, in this order!

Engine size.

Desired Power Level

Desired Boost pressure {max}

available fuel type {see above}


if your engine has a high static compression..thats fine. only got 91 octane? thats fine too.

so why dont you first start by running a LARGER turbo at LOWER boost than all your buddies setups and that will get you in the ballpark.

We run a twin t88 lsx motor at about 12psi..its a raw little bastard and around 10:1 or so.

shut down arizona speed and marine dyno at 4k rpm....you do the math.

low compression motors are DOGSHIT.

go look at any of the big power turbo cars out there. everyone is running high static comp.

i think the domestic world is about 5-10 years behind the import guys on turbo tech... mainly because without turbos, our cars are fucking worthless.

at least the domestics have the merit of large displacement engines from the factory.