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worth it???

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Old Feb 19, 2006 | 11:18 AM
  #1  
sohc prelude's Avatar
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From: pasadena, MD, USA
Default worth it???

alright im buying a turbo houseing and intercooler form my friened.. i jsut got a message form him it says..

" The turbo I ahve is a 16G off a first gen eclipse. The housing is pretty much in perfect condition and still has the external wastegate in tact and I also have the blow-off valve for it. The only minor problem is that the turbine wheel doesn't spin well although the wheel doesn't have any play which is good. If you know enough about them then that problem is easily fixable. "

now is that any easy fix or not? hes only gonna charge me $1oo for the turbo, wastegate and BOV then another 150 for a basicly brand new front mount.

any body know whats wrong with that turbo.. and how to fix it? please help me out here
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Old Feb 19, 2006 | 11:20 AM
  #2  
Hawkze_2.3's Avatar
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From: Further down the spiral, TX, usa
Default Re: worth it??? (sohc prelude)

Buy it if you want, but if you can't even spell, you probably won't have much success.
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Old Feb 19, 2006 | 11:24 AM
  #3  
sohc prelude's Avatar
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From: pasadena, MD, USA
Default Re: worth it??? (Hawkze_2.3)

that last post was no help.. i want to know if that turbo is gonna be able to run right and if not is there something minor i can do to fix it.. NOW SOME ONE WITH REAL ADVICE HELP ME OUT
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Old Feb 19, 2006 | 11:33 AM
  #4  
CivicSiDriver02's Avatar
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From: Westland, MI, USA
Default Re: worth it??? (sohc prelude)

The turbo is probably going to have to be rebuilt.
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Old Feb 19, 2006 | 11:36 AM
  #5  
sohc prelude's Avatar
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From: pasadena, MD, USA
Default Re: worth it??? (CivicSiDriver02)

ok that was actauly helpful.. what will i be looking at to have iot rubuilt? or do u think i should just go with a diff turbo ( im asking b.c i have no idea how good or bad that turbbo is and for the price and all)
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Old Feb 19, 2006 | 11:45 AM
  #6  
The Weather Man's Avatar
 
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From: The Wizard Of Oz, State Rd 1505, Section 8
Default

Go with a different turbo. The 16g is small as ****, and really won't do anything at all.

I say if the fmic is pretty decent in size, get that - and the bov. Get everything else yourself.
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Old Feb 19, 2006 | 11:50 AM
  #7  
sohc prelude's Avatar
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From: pasadena, MD, USA
Default Re: (TheKINGPin)

a small turbo isnet actauzly bad in my case.. the motor is stock and i only plan to run 10 psi max and around 6 for every day driveing? any would would refer?
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Old Feb 19, 2006 | 12:05 PM
  #8  
The Weather Man's Avatar
 
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From: The Wizard Of Oz, State Rd 1505, Section 8
Default

hope you feel something

6psi on a 16g?.......there's no point at all. You'll still get beat by most of us here with n/a motors.
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Old Feb 19, 2006 | 12:05 PM
  #9  
RemerLex11's Avatar
 
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From: PA, USA
Default Re: (sohc prelude)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sohc prelude &raquo;</TD></TR><TR><TD CLASS="quote">a small turbo isnet actauzly bad in my case.. the motor is stock and i only plan to run 10 psi max and around 6 for every day driveing? any would would refer?</TD></TR></TABLE>

16g is pretty small but if you're not looking for too much power then it would be fine. Anyway it would be a couple hundred dollars to get it rebuilt, but either way the price he's selling it for is a good deal assuming everything else is in perfect working order. so if you know what you're doing, go for it

oh and 6 psi is nothing on that turbo btw
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Old Feb 19, 2006 | 12:36 PM
  #10  
CivicSiDriver02's Avatar
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From: Westland, MI, USA
Default Re: worth it??? (sohc prelude)

A lot of times you can find rebuild kits on ebay. I have never rebuilt a turbo so I couldn't tell you how much time it would take or how much it would be to have a shop rebuild it.

Ok this may be a little long winded but I think it might help you and others out in finding a turbo that is the correct size for you engine and hp goals. Here goes:

First you have to find the pressure coming out of the compressor or Pco.

Pco=Boost pressure + Atmospheric Pressure + Pressure drop across intercooler.
Assuming you are at sea level you will get:
Pco=10+14.7+1.5
Pco=26.2 psi

Now you need to calculate the pressure ratio or Pr.
PRr=PCO/Atmospheric pressure
Pr=26.2/14.7
Pr=1.782

Now you have to guess what the post intercooler temp might be. Use 130F as it is accepted as accurate with most aftermarket intercoolers. You now need to calculate the post compressor and intercooler air density or Di.
Di=Boost pressure + Atmospheric pressure / R*12*(460 + post intercooler temp)
R=53.3 (constant from the ideal gas law)
12 is used to preserve the measurement in inches and 460 is used to convert from degrees F to degrees Rankin.
Di=10+14.7/53.3*12*(460+130)
Di=6.55*10^-5 lbs/cubic inch

Now you need to calculate mass flow rate(Mf) of the engine at the rpm where you want to plot the point on a compressor map. Lets say you want to plot a point at 6500 rpm, which is at redline on an f22a I think.
Mf=Di * Engine Displacement in cubic inches * RPM of match point / (2 * Volumetric Efficiency)
We will assume a Volumetric Efficiency of 90%
Mf=6.55*10^-5 * 134 * 6500 / (2 *.90)
Mf=31.7 lbs per minute

Now you need to find the corrected mass flow or CMf.
CMf=(Mf * the square root of the sum of, actual compressor inlet temp in degrees Rankin/545)/(Atmospheric Pressure / Corrected compressor inlet pressure)
CMf=(31.7 * sqrt (545/545)/(14.7/13.95))
CMf=30.1 lb/minute
545 degrees R = 85 degrees F (typical under hood temp)
13.95= corrected compressor inlet pressure considering the pressure drop across the typical air filter

The two items in bold are your points to plot on the compressor map. Now all you have to do is match your engine with a properly sized turbo with this equation and a compressor map. You can go in and change the RPM points at which the flow is measured by going back through and reworking the equation. You want your points to fall in the area of greatest efficiency on the compressor map. This will all make more sense once you have seen a compressor map. Just do a search on the web and you should be able to find a compressor map for the 16g.
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Old Feb 19, 2006 | 12:40 PM
  #11  
94Vtecluder's Avatar
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From: NY
Default Re: worth it??? (CivicSiDriver02)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CivicSiDriver02 &raquo;</TD></TR><TR><TD CLASS="quote">A lot of times you can find rebuild kits on ebay. I have never rebuilt a turbo so I couldn't tell you how much time it would take or how much it would be to have a shop rebuild it.

Ok this may be a little long winded but I think it might help you and others out in finding a turbo that is the correct size for you engine and hp goals. Here goes:

First you have to find the pressure coming out of the compressor or Pco.

Pco=Boost pressure + Atmospheric Pressure + Pressure drop across intercooler.
Assuming you are at sea level you will get:
Pco=10+14.7+1.5
Pco=26.2 psi

Now you need to calculate the pressure ratio or Pr.
PRr=PCO/Atmospheric pressure
Pr=26.2/14.7
Pr=1.782

Now you have to guess what the post intercooler temp might be. Use 130F as it is accepted as accurate with most aftermarket intercoolers. You now need to calculate the post compressor and intercooler air density or Di.
Di=Boost pressure + Atmospheric pressure / R*12*(460 + post intercooler temp)
R=53.3 (constant from the ideal gas law)
12 is used to preserve the measurement in inches and 460 is used to convert from degrees F to degrees Rankin.
Di=10+14.7/53.3*12*(460+130)
Di=6.55*10^-5 lbs/cubic inch

Now you need to calculate mass flow rate(Mf) of the engine at the rpm where you want to plot the point on a compressor map. Lets say you want to plot a point at 6500 rpm, which is at redline on an f22a I think.
Mf=Di * Engine Displacement in cubic inches * RPM of match point / (2 * Volumetric Efficiency)
We will assume a Volumetric Efficiency of 90%
Mf=6.55*10^-5 * 134 * 6500 / (2 *.90)
Mf=31.7 lbs per minute

Now you need to find the corrected mass flow or CMf.
CMf=(Mf * the square root of the sum of, actual compressor inlet temp in degrees Rankin/545)/(Atmospheric Pressure / Corrected compressor inlet pressure)
CMf=(31.7 * sqrt (545/545)/(14.7/13.95))
CMf=30.1 lb/minute
545 degrees R = 85 degrees F (typical under hood temp)
13.95= corrected compressor inlet pressure considering the pressure drop across the typical air filter

The two items in bold are your points to plot on the compressor map. Now all you have to do is match your engine with a properly sized turbo with this equation and a compressor map. You can go in and change the RPM points at which the flow is measured by going back through and reworking the equation. You want your points to fall in the area of greatest efficiency on the compressor map. This will all make more sense once you have seen a compressor map. Just do a search on the web and you should be able to find a compressor map for the 16g.</TD></TR></TABLE>

wtf u talking about Willis? The man just asked if he should pick up the turbo, not a proof of Einstein's theory of relativity lol
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Old Feb 19, 2006 | 12:46 PM
  #12  
CivicSiDriver02's Avatar
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From: Westland, MI, USA
Default Re: worth it??? (94Vtecluder)

Haha! I know that might have been excessive but I was bored and figured that maybe other people could get some use out of it too.
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