Stock twin turbo???

JT929240 · Aug 14, 2010

Their is a youtube video its called :

"1989 Ford Mustang GT 5.0 Twin Turbo"

This video is very confusing to me because ever since i have been looking on forum's people have basically been saying how weak 302 block are and if you put Forced Induction on a stock motor it will explode because it will lean out with stock fuel system and this guy is running stock everything with twin turbos i dont get it...And he said he gets on the highway 28 to 34 mpg?? If i could have left my motor stock and saved all that money balancing upgrading internals, fuel system etc..i would have just bought a twin turbo set up WTF

Three50won · Aug 14, 2010

I think this guy is outta his mind. No offense. The amount of boost needed to make 500 horsepower on a 129,000 mile pushrod engine with stock heads, a stock cam, and a stock intake even with a good tune would either blow those pistons, bend the rods, or crack the block. And it's an automatic. That trans is definitely not withstanding that much power after 129,000 miles. If he did all that work himself he would have spoken in more detail about the car. He said nothing about how much boost he was making, how much torque, the turbo size, tranny mods, gear ratios, tuning or any other modifications. Who builds a car like that, puts it on youtube, and talks about how the racing stripes disappear when the car gets sideways...?? 34 MPG's my @ss...that car ain't getting that much MPG if it were stock with a CAI, UDPs, and an exhaust. Those cars highway MPG ratings were only around 22-26 and he says hes getting that in city driving, yea right. So he managed to double the power output of a Fox GT and gain 10 mpgs...?? Summer gas...?? Winter gas...?? What is he talking about...?? Ethanol...?? You'd have to modify your fuel system to run E85 and you need way bigger injectors. You ain't just casually adding ethanol to a 500 hp 129,000 mile twin turbo GT with a stock fuel system and driving off...

Either this guy has a lot of money, bought a twin turbo kit, and dropped the car at a speed shop for a few months or he bought the car like that but he definitely didn't build that car himself. If he did build it, then he's playing dumb...

JT929240 · Aug 14, 2010

LOL...Yea i knew something was wrong about that clip i guess he is running small turbos and low boost so the motor doesn't explode..

NIKwoaC · Aug 15, 2010

Three50won said:
I think this guy is outta his mind. No offense. The amount of boost needed to make 500 horsepower on a 129,000 mile pushrod engine with stock heads, a stock cam, and a stock intake even with a good tune would either blow those pistons, bend the rods, or crack the block. And it's an automatic. That trans is definitely not withstanding that much power after 129,000 miles. If he did all that work himself he would have spoken in more detail about the car. He said nothing about how much boost he was making, how much torque, the turbo size, tranny mods, gear ratios, tuning or any other modifications. Who builds a car like that, puts it on youtube, and talks about how the racing stripes disappear when the car gets sideways...?? 34 MPG's my @ss...that car ain't getting that much MPG if it were stock with a CAI, UDPs, and an exhaust. Those cars highway MPG ratings were only around 22-26 and he says hes getting that in city driving, yea right. So he managed to double the power output of a Fox GT and gain 10 mpgs...?? Summer gas...?? Winter gas...?? What is he talking about...?? Ethanol...?? You'd have to modify your fuel system to run E85 and you need way bigger injectors. You ain't just casually adding ethanol to a 500 hp 129,000 mile twin turbo GT with a stock fuel system and driving off...

Either this guy has a lot of money, bought a twin turbo kit, and dropped the car at a speed shop for a few months or he bought the car like that but he definitely didn't build that car himself. If he did build it, then he's playing dumb...

The dude in the video is an idiot, I'll give you that. But a few things...

500 hp is 500 hp. If the bottom end can support it (and it can) with a good aftermarket H/C/I and a turbo, it can support it with a stock H/C/I and turbo. But you would have to run a lot of boost and the stock head gaskets won't be sticking around for long. I doubt this guy is making 500, though, I think he's talking out of his ass.

Summer gas and winter gas use different additives because of the temperature differences. Do some googling. Whatever the season though, this guy ain't getting 34mpg. Again, talking out of his ass.

Also, its not uncommon for gas to have a little ethanol in it. Some places more than others.

Incon · Aug 15, 2010

The video says between 450-500 hp.

Do a search for Turbo Driven Concepts (TDC) and look at what those old school kits were capable of doing.

He said between 28-34 mpg... I call BS on the 34, but 28 is very reasonable.

I also think he bought the car already assembled. Cracked his intake gaskets??? LOL

Three50won · Aug 15, 2010

NikwoaC said:
The dude in the video is an idiot, I'll give you that. But a few things...

500 hp is 500 hp. If the bottom end can support it (and it can) with a good aftermarket H/C/I and a turbo, it can support it with a stock H/C/I and turbo. But you would have to run a lot of boost and the stock head gaskets won't be sticking around for long. I doubt this guy is making 500, though, I think he's talking out of his ass.

Summer gas and winter gas use different additives because of the temperature differences. Do some googling. Whatever the season though, this guy ain't getting 34mpg. Again, talking out of his ass.

Also, its not uncommon for gas to have a little ethanol in it. Some places more than others.

See, I know a stock block can handle around 500 hp max but I'm just not sure those pistons and rods can handle the amount of boost needed with stock H/C/I to make 500 RWHP. A good aftermarket HCI would need a lot less boost because the engine would be a lot more efficient than with stock HCI. I took the whole ethanol statement as him trying to say he has the stock fuel system and he runs E85. I'd say maybe 20-24 hwy mpgs with conservative driving...cracked intake gasket, haha!!

Incon · Aug 15, 2010

I made 421 rwhp with a stock HO long block (throttle body to oil pan with only arp head studs) and an old Turbo Technology Incorporated street kit. That combo ran for years on the street.

The HO rotating assembly can survive far more HP than the stock roller block can. As always, the "tune" is paramount to any combo surviving.

The problem with boost and a stock long block is that the cast iron ford heads tend to lift at higher boost levels. A decent aftermarket aluminum head has thicker decks and will always seal better.

Take a look at the turbo kit under in the video. Now imagine popping a head gasket and having to take all that apart. Trust me, it gets old very quick.

NIKwoaC · Aug 15, 2010

Three50won said:
See, I know a stock block can handle around 500 hp max but I'm just not sure those pistons and rods can handle the amount of boost needed with stock H/C/I to make 500 RWHP. A good aftermarket HCI would need a lot less boost because the engine would be a lot more efficient than with stock HCI. I took the whole ethanol statement as him trying to say he has the stock fuel system and he runs E85. I'd say maybe 20-24 hwy mpgs with conservative driving...cracked intake gasket, haha!!

Combustion pressures would be the same (or, at least, similar), regardless of what the top end looks like. That's why I said 500 hp is 500 hp. The extra boost would be required to overcome the flow inefficiencies of the stock top end, but would ultimately result in filling the cylinder with the same amount of air/fuel as an aftermarket H/C/I running lower boost. In other words, the bottom end would be exposed to the same amount of abuse in either scenario, but like Incon said, the real problem on a stock setup would be lifting a head and popping a gasket. Head studs, a good gasket, and a conservative tune would remedy that, though.

f8tlfiveo · Aug 16, 2010

I'm building a twin turbo kit with the turbocoupe turbos stock lower with gt40p heads.. I am anxious to see how much power it's gonna make at 8lbs of boost...

millhouse · Aug 16, 2010

jeepguy00 said:
I'm building a twin turbo kit with the turbocoupe turbos stock lower with gt40p heads.. I am anxious to see how much power it's gonna make at 8lbs of boost...

Been there...expect 425-450RWHP through a manual.

90lxcoupe · Aug 16, 2010

Three50won said:
See, I know a stock block can handle around 500 hp max but I'm just not sure those pistons and rods can handle the amount of boost needed with stock H/C/I to make 500 RWHP. A good aftermarket HCI would need a lot less boost because the engine would be a lot more efficient than with stock HCI. I took the whole ethanol statement as him trying to say he has the stock fuel system and he runs E85. I'd say maybe 20-24 hwy mpgs with conservative driving...cracked intake gasket, haha!!

if the car is tuned right the rods and pistons will outlast the block

f8tlfiveo · Aug 17, 2010

Yeah I got a force trans to hold the power... Hope the 8.8 lasts a little while before I have to replace it.

JT929240 · Aug 23, 2010

so i have a 302 block with upgraded internals gt40 heads with upgraded valves and springs with a v-1 with 8-10 pounds of boost in the works what kind of HP am i lookin at after a tune of course?

millhouse · Aug 23, 2010

JT929240 said:
so i have a 302 block with upgraded internals gt40 heads with upgraded valves and springs with a v-1 with 8-10 pounds of boost in the works what kind of HP am i lookin at after a tune of course?

With a supercharger, I don't think 375-400rwhp would be out of the question.

JT929240 · Aug 23, 2010

i was hoping for 400HP i just need to smoke a friend of mine at work he has a stock 2000 camaro SS.....

Stock twin turbo???

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