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Old 07-18-2011, 09:35 PM   #1
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Just to be clear

What is better for the stock bottom end on the 5.0? A turbo at low boost (4-5 pounds) or a centrifugal supercharger at the same boost levels. Is it streetable? Fuel mileage like?
I'm just curious, it'll affect my long term goals. Thanks!
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Old 07-18-2011, 10:43 PM   #2
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Re: Just to be clear

I personally would say the supercharger, that will increase ur HP across the whole RPM band whereas a turbo will have a lil turbo lag at least in the beginning. Just my two cents I'm sure some other people will be able to give u some better info on here.
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Old 07-19-2011, 12:19 AM   #3
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I've been told that at that level of boost, lag doesn't exist except for maybe 1500 rpm or lower which the super would only be really making less than a pound at that level also. Remember, I'm not concerned with throttle response as so much reliability and efficiency.
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Old 07-19-2011, 12:29 AM   #4
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Quote:
Originally Posted by wc3john
I've been told that at that level of boost, lag doesn't exist except for maybe 1500 rpm or lower which the super would only be really making less than a pound at that level also. Remember, I'm not concerned with throttle response as so much reliability and efficiency.
Honestly, you'll make way more power at 6lbs than that on a s/c, and depending on the size of turbo, if it's small there really won't be any lag significantly worse than a supercharger. And, at your goals of low psi, a small turbo would work great. The only difference is really the price and labor if you get it installed.
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Old 07-19-2011, 12:41 AM   #5
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Re: Just to be clear

A Turbocharger is easier on your engine because:

1. It does not side load the crankshaft like a belt driven supercharger does.
2. It does not introduce any extra unwanted harmonics into the crankshaft.

However, a Turbocharger does increase underhood temperatures, so you should take extra measures to minimize the heat build up.
Insulate the TC and increase ventilation into and out of the engine bay if possible.
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Old 07-19-2011, 12:50 AM   #6
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Quote:
Originally Posted by Trojan Horse

However, a Turbocharger does increase underhood temperatures, so you should take extra measures to minimize the heat build up.
Insulate the TC and increase ventilation into and out of the engine bay if possible.
I actually new a guy with a turboed 93 5.0 and he actually built a duct from the right foglight hole that let air flow directly across the turbo. Apparently it really lowered the temps under the hood when he measured it. I'll text him and see of he'll send me some pics
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Old 07-19-2011, 01:06 AM   #7
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Re: Just to be clear

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I actually new a guy with a turboed 93 5.0 and he actually built a duct from the right foglight hole that let air flow directly across the turbo. Apparently it really lowered the temps under the hood when he measured it. I'll text him and see of he'll send me some pics
That would be great if he would share his idea.

I am planning to do that on my 86 GT to feed cold air to the air intake filter. I figured on using some flexible ducting and fabricating a connector to the fog light cut out, but it would be nice to see a working set up.
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Old 07-19-2011, 02:06 AM   #8
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Quote:
Originally Posted by Trojan Horse

That would be great if he would share his idea.

I am planning to do that on my 86 GT to feed cold air to the air intake filter. I figured on using some flexible ducting and fabricating a connector to the fog light cut out, but it would be nice to see a working set up.
Yeah, lol... It's so sick. But it's such a sleeper. Looks bone stock but has I'm pretty sure around the 500ish rwhp mark
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Old 07-19-2011, 02:13 AM   #9
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Here's a pic of it I found on Facebook, too bad I can't find pics of the engine bay... But still all stock looking except for the hood.
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Old 07-19-2011, 02:14 AM   #10
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Originally Posted by Trojan Horse

figured on using some flexible ducting and fabricating a connector to the fog light cut out, but it would be nice to see a working set up.
I'm pretty sure that's all he did, he just cleaned it up and made it look pretty.
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Old 07-19-2011, 02:16 AM   #11
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He just texted me back! 507rwhp... Ha, too bad he said he's in Dallas visiting some friends and he cant send pics of the engine bay yet. But when he does...
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Old 07-19-2011, 04:39 AM   #12
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So in your opinion and experience, what would a safe, street-able boost level be for the stock bottom end?
What about the top end?
Can the stock heads handle that much boost?
What if I changed pushrods and springs, would that be all that was necessary to modify the e7's to safely handle the pressure?

I personally like the sound of a turbo as well as the "free" power they use.
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Old 07-19-2011, 06:55 AM   #13
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My little brother has a pretty much stock 5.0. I say stock but it has gt40 heads and a explorer intake. He just installed a 76mm turbo. I have drove it and loved it. At 10 psi it laid down 430 at the wheels. I have drove it, it runs like a bone stock motor untill u hit the gas and after that, you better hold on. I have had supercharged 6-7 psi roots type but nothing felt like that
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Old 07-19-2011, 09:16 AM   #14
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Re: Just to be clear

Quote:
Originally Posted by wc3john View Post
So in your opinion and experience, what would a safe, street-able boost level be for the stock bottom end?
What about the top end?
Can the stock heads handle that much boost?
What if I changed pushrods and springs, would that be all that was necessary to modify the e7's to safely handle the pressure?

I personally like the sound of a turbo as well as the "free" power they use.
With a stock bottom end I would stay with 6-8 PSI.
The stock heads can handle the boost pressure just fine.
Where they fall down is being able to flow adequately at higher pressures and horsepower levels.
Changing pushrods and springs probably won't net you enough gains to be worth the money spent.
To build more power you need to ensure the bottom end will hold up and the intake and exhaust can handle the flow.
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Old 07-19-2011, 10:02 AM   #15
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Re: Just to be clear

I have a stupid question my car has a vortech v3 on it how do you find out how much boost it is set at.
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Old 07-19-2011, 10:45 AM   #16
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Re: Just to be clear

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I have a stupid question my car has a vortech v3 on it how do you find out how much boost it is set at.
Install a boost gauge.
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Old 07-19-2011, 11:36 AM   #17
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Re: Just to be clear

turbo has less strain on the engine as it doesnt take power to make power, psi is psi though but a turbo will make more power per boost~
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Old 07-19-2011, 12:07 PM   #18
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Re: Just to be clear

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turbo has less strain on the engine as it doesnt take power to make power, psi is psi though but a turbo will make more power per boost~
Exactly!

Because...There is less "parasitic" power loss on the Turbocharger which uses exhaust gasses to spin the Turbo to produce boost, than there is with a Supercharger that is belt driven by the crankshaft to produce boost.
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Old 07-19-2011, 12:20 PM   #19
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Re: Just to be clear

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Originally Posted by wc3john View Post
So in your opinion and experience, what would a safe, street-able boost level be for the stock bottom end?
What about the top end?
Can the stock heads handle that much boost?
What if I changed pushrods and springs, would that be all that was necessary to modify the e7's to safely handle the pressure?

I personally like the sound of a turbo as well as the "free" power they use.
if you want fuel economy dont go a pound over 6psi. that will get you close to 100% volumetric efficency... that point where having boost actualy helps you get better gas milage. there is very lil upgrade you need to do to your fuel system. you can still u run 19lbs injectors and a fmu... or u can upgrade to 24lbs injectors and operate on the lower end of the fuel pressure.

im running 11psi on a stock bottom end... i do run arp head studs, and mls head gaskets though. i have e7's that i ported a lil..ok, alot on the exhaust side. i run .560 lift valve springs. and i have 3.45 gears in the rear, 30lbs injectors, 1.7rr, e-cam...
the gas milage isnt that great, even normal driving... but i can get it to go sideways in third... and at the end of the day, thats all that matters
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Old 07-19-2011, 01:00 PM   #20
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the gas milage isnt that great, even normal driving... but i can get it to go sideways in third... and at the end of the day, thats all that matters
That's awesome best quote I've read all day
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Old 07-19-2011, 02:42 PM   #21
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Re: Just to be clear

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Originally Posted by svtlx View Post
if you want fuel economy dont go a pound over 6psi. that will get you close to 100% volumetric efficency... that point where having boost actualy helps you get better gas milage. there is very lil upgrade you need to do to your fuel system. you can still u run 19lbs injectors and a fmu... or u can upgrade to 24lbs injectors and operate on the lower end of the fuel pressure.

im running 11psi on a stock bottom end... i do run arp head studs, and mls head gaskets though. i have e7's that i ported a lil..ok, alot on the exhaust side. i run .560 lift valve springs. and i have 3.45 gears in the rear, 30lbs injectors, 1.7rr, e-cam...
the gas milage isnt that great, even normal driving... but i can get it to go sideways in third... and at the end of the day, thats all that matters
for the stock engine, all I care about is vol. efficency. Thank you all for the help.
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