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  #76 (permalink)  
Old 06-12-2010, 08:38 PM
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You dont want to use a thick gasket. Quench needs to stay around .040 or under to help with detonation control. I think big block injectors are available for the tbi if you use it with ms.

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  #77 (permalink)  
Old 06-12-2010, 08:43 PM
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The problem with building a low-rpm turbo motor is the the engine has to rev up the make the turbos spin and make boost, i would go with a supercharger instead.
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  #78 (permalink)  
Old 06-12-2010, 08:52 PM
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Quote:
Originally Posted by bigdog7373
The problem with building a low-rpm turbo motor is the the engine has to rev up the make the turbos spin and make boost, i would go with a supercharger instead.
Not true at all. If they are sized properly and for low RPM, they will make boost as soon as the engine begins to see a load.
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  #79 (permalink)  
Old 06-12-2010, 09:08 PM
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Quote:
Originally Posted by TurboS10
You dont want to use a thick gasket. Quench needs to stay around .040 or under to help with detonation control. I think big block injectors are available for the tbi if you use it with ms.
TPI not TBI. But that would be a great idea if I was using the TBI setup.

Quote:
Originally Posted by bigdog7373
The problem with building a low-rpm turbo motor is the the engine has to rev up the make the turbos spin and make boost, i would go with a supercharger instead.
Exactly what turbos10 said. Different size turbos will make different amounts of boost at different points in the rpm range. So as said if you size the turbos to the engine they will work fine. Thats why when building a turbo engine it is critical to get a hold of the compressor maps for the turbos. This will show how much air measured in cfm, lb/min, or lb/hr the turbo can flow while creating a certain pressure ratio. I imagine these turbos will be all in around 2500rpm by seeing how small they are. I will only really know until I slap it together and see how it runs.
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  #80 (permalink)  
Old 06-12-2010, 09:23 PM
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Unless you are just dead set on twins, an HX35 would do what you want and they are available everywhere.
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Old 06-12-2010, 09:24 PM
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Quote:
Originally Posted by TurboS10
Unless you are just dead set on twins, an HX35 would do what you want and they are available everywhere.
Single hx35? Yeah I guess your right two of the T25 turbos would flow about that of an hx-35. I was actually thinking about using two hx-35 on a 350 i am planning.

Last edited by zildjian4life218; 06-12-2010 at 09:35 PM.
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  #82 (permalink)  
Old 06-13-2010, 08:25 AM
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Originally Posted by zildjian4life218
Single hx35?
It would be a less fab work with one.
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  #83 (permalink)  
Old 06-13-2010, 10:32 AM
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Quote:
Originally Posted by TurboS10
It would be a less fab work with one.
Thats true but I don't mind doing the twins. I figured for the fab work im either gonna use center dump manifolds or just flip the stock manifolds around so they face to the front. And then I will weld on some tubing that will point down and weld on a T25 flange. I will just have to keep them above the oil level.
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  #84 (permalink)  
Old 07-04-2010, 08:24 AM
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Soon ill pull the turbo apart to clean it up. Just waiting for some time. I also have to go back to the yard to get another one.
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  #85 (permalink)  
Old 07-13-2010, 04:30 PM
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I was talking the other day with some friends of mine that are big into turbo charging hondas. They said for injectors the can get a hold of 4 450cc injectors for $50 off of a DSM factory turbo car. Anyway these would work on my tpi intake? I used an online calc and found them to be 42 lb/hr which would be perfect for my build. I was wondering what I would have to worry about fitting properly. I know for the wiring connector I can just get the connectors from that car and splice them onto my harness. Not sure on the intake rail connection or where they go into the intake. Any one have any idea?
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Old 07-13-2010, 10:40 PM
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Either they will fit or they will not. There is no room in between. You will need to know if they are high or low impedence as well.
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Old 07-14-2010, 09:58 AM
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Quote:
Originally Posted by TurboS10
Either they will fit or they will not. There is no room in between. You will need to know if they are high or low impedence as well.
Alright thanks im gonna go through tonight and play with them and see if it works or not. Ill also post pictures of both injectors. I believe they are low impedance because when my friends use them on their hondas they have me wire in a resistor box that is used to drain off the excess current. Which would make me to believe that the factory injectors are high impedance.
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  #88 (permalink)  
Old 07-14-2010, 11:09 AM
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Quote:
Originally Posted by zildjian4life218
Alright thanks im gonna go through tonight and play with them and see if it works or not. Ill also post pictures of both injectors. I believe they are low impedance because when my friends use them on their hondas they have me wire in a resistor box that is used to drain off the excess current. Which would make me to believe that the factory injectors are high impedance.
Yes, if you are adding resistors then you are correct. Some ECU's can be set to work with lowZ without the resistors, but some require them. Depends on your end setup.
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  #89 (permalink)  
Old 07-14-2010, 11:41 AM
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Quote:
Originally Posted by TurboS10
Yes, if you are adding resistors then you are correct. Some ECU's can be set to work with lowZ without the resistors, but some require them. Depends on your end setup.
it will be a megasquirt ms2.
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  #90 (permalink)  
Old 07-24-2010, 11:13 PM
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So I think I might go with some bigger turbos...........

Can someone with turbo knowledge or any knowledge that can help check my math. I bought a book titled "Street Turbocharging" by HP Books. In here is a step by step calculations for plotting turbo compressor maps.

Okay first off you figure out the specs of the engine
305ci
assuming 80% VE
8.5:1 CR
12psi
Redline 5000
IC Eff 60%

Figure out the Pressure Ratio of the compressor
(12+14.7)/14.7 = 1.816

Then the Pressure Ratio of the System assuming a 1 psi drop through the Intercooler
(12-1+14.7)/14.7 = 1.748

Now we figure out the temperature rise after the compressor assuming ideal
Toutideal = [(Tin+460)*PR^0.283]-460
[(85+460)*1.1839]-460]
185*F

Now we find the actual temperature assuming the efficiency of the turbocharger which is 72%.
Toutactual=[(185-85)/.072]+85 = 223.8*F

Now we find the temp of the air coming out of the Intercooler.
TempIC=224-[.60*(224-85)]
140.6*F

The Density Ratio is then figured out by
DR = 1.75*[(85+460)/(140.6+460)] = 1.5869

Then you figure out the VFR which is the volumetric flow rate at redline of the NA engine.
VFR=305*5000*.80/3456= 353cfm

Last step is to find the Mass flow rate which is
MFR=(2.703*14.7*353*1.5869)/85+460 = 41 lb/min

Sorry its so long I want to make sure I have this somewhat right. Thanks! These turbos flow 15 lb/min at a PR of 1.82 so idk if they will quite cut it. I think I will be spinning them way too much and burn them up.

I attached a compressor map for the turbo I am using. The red dot shows where I would be sitting.
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Last edited by zildjian4life218; 07-24-2010 at 11:52 PM.
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