would the oil pressure sending unit in the top back of the block be sufficent to feed 2 t-3's? if not where do it drill and tap? and what size fittings 'n stuff? thanks

 

That's no problem. I've got a T screwed into there, and run a -4 AN line to each turbo (with -10 drains to the oilpan).

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askulte would know but some of the instructions list the fitting near the filter

 

I'm probably going to try the fitting in the front face, passenger side above the timing cover. But the one down by the filter will definity work...

 

I think for turbo oiling, just about anything will work. On startup, the turbos are hardly spinning at all, so a delay of oil won't hurt anything. They don't need much oil - since the bearing/bushing & shaft clearance acts as a small orifice. Just make sure your drain lines are all going down, and arae above the oil level in the pan.

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Yea, what he said, but I'll add that I've never heard of someone not getting enough oil, but I've heard of dozens of people that have gotten too much. Most put a restrictor with a .050-.100" hole in it (tiny), so you don't have to worry about too little oil.

 

I have used restrictors to fix smoking probs on cars with high vol/press oil pumps

 

what psi is good for t-3's from turbo coupes? too much will just blow by the seals right? a restrictor is just like an air regulator but for oil right?

 

Could you use the small oil line that goes to an oil pressure gauge? That's pretty small and doesn't flow that much oil.

Brad...

 

Either use a -3 or -4 oil feed line to the turbos....doesn't really matter where you get it from

As long as you dont have a "high pressure" pump you wont have smoking problems with your turbos. If you are smoking with turbos with a "high volume" pump your turbos are in need of rebuilding

 

High pressure and high volume are generally one and the same. Pressure is created by a resistance to flow. If you try to push more oil (volume) your pressure will go up. If you've got more pressure with the same clearances, the volume of oil you're moving has increased. Just FYI.

Fluid will take the route of least resistance. If you're running tight clearances, your HV/HP pump will also present the same pressure at the turbo, possibly forcing oil past the seals. As long as you don't have too much pressure at the turbo, you should be just fine. FWIW - I've been running a HV/HP pump for 2 years now (on what was a stock L98) and had no problems with oil getting past the turbo seals. A major reason for seal leakage could also be a poor oil drain line, which should always be as vertical as possible, and ending above the oil level in the pan.

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so what do you TT guys think. I have a 383 stroker (carb) which makes around 300 to the wheels, i run a consistant 13.30@107mph what do you think 5psi will do for that? my 60' times is 2.1 so the TT's should help that out too

 

That’s a bit of a loaded question since unless there is something wrong with your combination you should have the power to run at least a low 1.7 60’ now, a low 1.8 with an auto, stock converter, crappy gears and a slightly mismatched cam, so I’d have to assume that you’re spinning or having other problems now. With that kind of 60’ you’d be running a high 12 as the car sits.

Assuming that you don’t pick up any traction and don’t loose any you should be able to expect about a 12.20 @ 116 with 5 psi, assuming that you get everything tuned right, a mid 11 if you can get your 60’ in to the 1.6-1.7 range.

 

i run street tires, here is the best 60' run yet...
r/t .750
60' 1.921
330 5.621
1/8 8.601
mph 82.04
1000 11.173
1/4 13.304
mph 106.17

i since went to the track with my new drag radials and due to high winds the track was only running the 1/8 and i went 2 mph faster with everything else the same, i got 3 runs so figuring out the best launch was ment for another nite.

 

I went from 13.5@104 to 12.7@114 at 5 psi on a Super Ram'd stock L98 when I bolted on the turbos.

Ya want to play with numbers:

HP * Pressure Ratio = New HP

Current HP * (Boost + 14.7)/14.7 = New HP
300 hp * (5 psi + 14.7)/14.7 = 300 * 1.34
= 402 hp

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thanks, its had to decifer the equasion, maybe it can be cleaned up by say 14.7=1bar?

 

Sure

New formula:

HP * (Boost in bars+1.0197) = New HP

1 bar = 14.5037 psi = 1.0197 atm = 10^5 Pascals

 

Of course, that will only work if you've got an intercooler that will lower the charge temp down to the same as the air temp on the NA run and not loose pressure across it.

With out that, you'll loose some due to the adiabatic efficiency (heat added) of the compressor. To give you some idea of how big this is, at a pressure ratio of 2 (29.4psia or 14.7psig) with no intercooler you’ll have a density ratio of about 1.6 (I say about because this is effected by a few different things, biggest of which is where you are on the compressor map of your turbo).

In a nutshell, at a pressure ratio of 2, you’ll be forcing about 1.6x the air into the engine as NA and assuming good tuning making about 1.6x the power.

 

intercoolers!! oh i got those. i have (dont laugh) 2 volvo 740 IC's measurements
34" inlet to inlet
core
24"X17"X2.5"
inlets are 2.5"
i am going to run 2 of them (one for each turbo) and a series of electric fans to keep everything flowing
and i have a 2special tools to get them in there.......a shoehorn and a sawsall.

 

It's just ballpark If someone asks "I have x hp, how much will I have with y psi boost?" it's a convenient ballpark number (i.e. 15 psi boost doubles hp).

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I've seen/heard that so many times but I've never really really checked it before... I did this time.

So... at 85* at sea level assuming that the compressor stays at 70% efficientcy you need a pressure ratio of just under 3.1 (about 31psi boost) to get a density ratio of 2.

hum, that means that you'd probably have to run something in the low 30psi range to get 300hp out of an LG4

 

Good to know

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