Most potential using factory parts?

Not a what car thread, but, rather, what vehicle has the most upgradable horsepower available using only factory parts? No engine swaps, no "mugen, sti, trd, ford racing, blah blah blah" I'm talking assembly line parts. And we are going for % over what the stock trim HP was.

Sc300 with supra turbo parts on it?

So, I'm trying to decide the rules you've placed here...... are we talking using parts only originally intended for that vehicle, or only parts from the same manufacture, but installed on other vehicles in the product lineup? Say, taking the twin turbo setup off a 3.5 Ford and putting them on a originally NA 3.5? What about swapping say, the explorer intake onto a mustang engine? different cylinder heads ok?

Simple answer is any turbo car. Turn up boost until you break something then turn it down a quarter turn.

I'm gonna go with something older. Like an old Chevy with a SBC in it. There are some later factory parts that would wake that up

Going for the low hanging fruit here.

The 2016 Tahoe V8 makes 355 hp

The 2016 Z06 V8 makes 650

It's the same basic engine architecture, but lots of parts would have to change.

Keith Tanner wrote: I'm gonna go with something older. Like an old Chevy with a SBC in it. There are some later factory parts that would wake that up

I originally was thinking this, but he said only OEM, so take a low performance 350 and throw vortec heads, gm aluminum intake, holley, valvetrain stuff from 60's solid lifter motors, pistons from some variant, and you maybe went from 200 to 400.

The Audi 2.7TT is good for 250hp/256tq from the factory. A reflash of the software will take it to 318hp/356tq. As a percentage increase that stands pretty high.

tuna55 wrote:

Keith Tanner wrote: I'm gonna go with something older. Like an old Chevy with a SBC in it. There are some later factory parts that would wake that up

I originally was thinking this, but he said only OEM, so take a low performance 350 and throw vortec heads, gm aluminum intake, holley, valvetrain stuff from 60's solid lifter motors, pistons from some variant, and you maybe went from 200 to 400.

The rules say "percentage gain", so 200-400 is a greater percentage gain than the 355-650 example. And the SBC started at 110 hp according to Wiki.

The answer here is DSM. Stock is 210HP, but many have dynoed well over 600HP to 700hp on stock internals.

So there is a 200% performance gain over stock using stock parts.

NordicSaab wrote: The answer here is DSM. Stock is 210HP, but many have dynoed well over 600HP to 700hp on stock internals. So there is a 200% performance gain over stock using stock parts.

The 4g63 is a great engine, but there is no way that it accomplished that on a factory turbo and fueling, which is what I interpret the OP was asking for.

Bridge-ported rotary? You're using factory parts -- just less of them. :)

Trackmouse wrote: Not a what car thread, but, rather, what vehicle has the most upgradable horsepower available using only factory parts? No engine swaps, no "mugen, sti, trd, ford racing, blah blah blah" I'm talking assembly line parts. And we are going for % over what the stock trim HP was.

You could get 300hp from a 110hp 13B with some porting, headers, and a new intake.

Pretty much ALL rotaries use OEM parts, nobody makes anything else except for some high end apex seals that aren't as good as stock.

In reply to Keith Tanner:

Indeed you're correct.

Are you planning to use our collective GRM wisdom to develop an App?

It might be a more interesting challenge to ask what vehicle / engine combo has the most power potential without removing the engine from the vehicle. Use whatever parts you want, but you have to be able to install them without unbolting the engine mounts or using an engine hoist.

rslifkin wrote: It might be a more interesting challenge to ask what vehicle / engine combo has the most power potential without removing the engine from the vehicle. Use whatever parts you want, but you have to be able to install them without unbolting the engine mounts or using an engine hoist.

You're just trying to disqualify the rotary!

rslifkin wrote: It might be a more interesting challenge to ask what vehicle / engine combo has the most power potential without removing the engine from the vehicle. Use whatever parts you want, but you have to be able to install them without unbolting the engine mounts or using an engine hoist.

Isn't that essentially asking "Which OEM engine can take the most boost?"

tuna55 wrote: Going for the low hanging fruit here. The 2016 Tahoe V8 makes 355 hp The 2016 Z06 V8 makes 650 It's the same basic engine architecture, but lots of parts would have to change.

i think a LS engine is probably one of the top competitors here when it comes to % of HP gained with factory parts. take a early 5.3 (270 hp) and strip it down to the short block then slap on everything from a zr1, heads, cam, blower, etc and i'd imagine you would be around 600 hp. Maybe if you could go though the parts bin and find an oversized crank pulley and up the boost while you are there for a few more ponies

Trackmouse wrote: Not a what car thread, but, rather, what vehicle has the most upgradable horsepower available using only factory parts? No engine swaps, no "mugen, sti, trd, ford racing, blah blah blah" I'm talking assembly line parts. And we are going for % over what the stock trim HP was.

Technically, the transmission involved should be addressed as well. It's great to double or triple the horsepower but if the first hard launch munches the whole trany into steel confetti.....

rslifkin wrote: It might be a more interesting challenge to ask what vehicle / engine combo has the most power potential without removing the engine from the vehicle. Use whatever parts you want, but you have to be able to install them without unbolting the engine mounts or using an engine hoist.

Easy -- unbolt the subframe, use a 2-post lift to take the body off the top, unbolt everything from the engine except the motor mounts and the subframe, machine away. You need a car where the subframe isn't in the way of getting the oil pan off, and it might require some creative mounting on the boring machine. :)

Another title for this thread could be "what engines have the biggest design mistakes in them that the factory later corrected?"

Is head-swapping allowed? I assume engine-swapping isn't.

Mustang. The base model makes around 300, the top Cobra Jet model makes over 1000. Show me another car that you can more than triple the HP using nothing but parts from the production line for the same model.

Buick v6..add boost till you run over the crank Chevy ls..add boost till they kick you off the track for no cage

12v Cummins with a P7100 pump. 180 hp stock, turning one fuel screw gets you 300+. Upgrade to a later 24v turbo and you get 400 easy. File down one side of the boost pin and you have 500. After that, porting the heads, porting the pump, and careful turbo selection will get you well beyond 1000hp. I remember about 10 years ago reading about a 12v making 1200hp and 2131 lb-ft and about the only aftermarket parts were the turbo and the exhaust. Those numbers are well into the 2000-hp range now.

So assuming it starts at 180hp and ends up at a modest 1000hp, that's an easy 450%.

Heck, dad's Duramax is putting 935 lb-ft to the wheels (roughly 1200 at the crank) with 30-over modified stock injectors, a cold-air intake, a 5-position chip, and big exhaust. That's about a 200% increase in TQ. Granted, it used aftermarket parts, but it could have been done with a reflash, gutted air cleaner, and a sawzall after the downpipe.