I highly doubt those HP figures for that engine. Don Nase Jr ran 6 sec 1/4 miles with a four but it was an Ecotec than ran very high boost . If the numbers are true forget about street ability. There was a guy at Lititz who drove in with a notchback SD4 and he claimed 170 HP.
If that was fully built for racing, he would get close to 350-400hp with a standard fuel injection system. Add the turbo to the race motor and you would go to maybe 550. I'm pretty sure you could use the nitrous for a 1 or 2 second burst before some serious issues occur. Now if it had the Cosworth head on it, I could see a little more power. I wonder what he is using for a fuel delivery system.
I just don't know the limitations on that block. Pulling 800 horsepower for any length of time out of an SD4 might be asking for trouble.
Edit to add.....plus he needs to get rid of that A/C pump
[This message has been edited by IMSA GT (edited 05-28-2016).]
I highly doubt those HP figures for that engine. Don Nase Jr ran 6 sec 1/4 miles with a four but it was an Ecotec than ran very high boost . If the numbers are true forget about street ability. There was a guy at Lititz who drove in with a notchback SD4 and he claimed 170 HP.
I think it would be possible, but it would have taken a time investment in the tune to dial up that kind of power. There is a member of the Michigan Fiero club who has a 3.0 SD4 with 2 valve heads and port fuel injection whose engine pulled 350HP on an engine dyno, and that's naturally aspirated. He also has a two stage nitrous system that can add another 150HP so he has 500HP at his disposal from his SD4.
170HP was what could be expected from a 2.7 SD4 with a Corvette TBI on the intake manifold. I knew another person who had such an engine in his Fiero.
Consider that the original Fiero SD4 Indy 500 pace car had an "all out" racing engine that made 270HP and that engine was hardly streetable. If it were possible to wring out more horsepower, wouldn't GM have done it? Regardless for people that like the 4 cylinder engines, the Ecotec is a far better choice. Don Nase Jr made 1450 HP from the Ecotech on 55 psi of boost and that was an amazing achievement. Here it is: [YOUTUBE]https://youtu.be/4G3DKlFvhAc[/YOUTUBE] ------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 05-29-2016).]
Originally posted by Dennis LaGrua: Consider that the original Fiero SD4 Indy 500 pace car had an "all out" racing engine that made 270HP and that engine was hardly streetable. If it were possible to wring out more horsepower, wouldn't GM have done it? Regardless for people that like the 4 cylinder engines, the Ecotec is a far better choice. Don Nase Jr made 1450 HP from the Ecotech on 55 psi of boost and that was an amazing achievement.
Who cares?
What in the world makes you think a tubbed out Chevette with wheelie bars is meant to be "streetable" in the first place?
The SD4 in the real pace car was only one version of the SD4. Why would GM try to "wring out" more power from it? The engine was built under regulations for the class the cars were racing in, and it was naturally aspirated with a carb, not port injection. It wasn't an "all out" drag racing build. The Ecotec you are talking about was an all out drag racing build, and had a massive turbocharger. There's no reason a turbocharged MPFI 3.0 SD4 can't make 500 HP. It's not that hard to do. Hell, the SD4 straight out of the real pace car with a turbo bolted to it making 15 PSI boost, would have made over 500 HP, assuming detonation could be avoided and it could pump enough fuel in for the boost.
The SD4 is a fine old engine, but it's old, and the original post really doesn't have anything to do with Fieros. Heck, it's not even in a Pontiac. The Iron Duke came in many GM vehicles, and just because someone built up an SD4 to throw in one, doesn't make it related to the Fiero.
The SD4 is a fine old engine, but it's old, and the original post really doesn't have anything to do with Fieros. Heck, it's not even in a Pontiac. The Iron Duke came in many GM vehicles, and just because someone built up an SD4 to throw in one, doesn't make it related to the Fiero.
The SD4 was a Pontiac engine and I have one in my Indy. Just found it's capabilities interesting - thought others in the "sandbox" may too...
The SD4 was a Pontiac engine and I have one in my Indy. Just found it's capabilities interesting - thought others in the "sandbox" may too...
I thought it was interesting. Never would have seen this in the other cars section. This forum is so dead lately I welcome posts on any topic in any forum.
Consider BMW made 1300hp on the production 4 cylinder shortblock. Admittedly very different head and 90 lbs of boost, but the shortblocks of the 80s F1 cars were supposedly seasoned production blocks.
Boost is a funny thing, as long as you can keep out detonation and feed it fuel you can make crazy amounts of power. Also of course assuming the rotating assembly can take it, but isn't that what forged internals are for? So could a duke make 800hp if built for it with some massive turbo setup? Probably, yeah. Would it be useful for anything except drag or standing mile racing? Nope, the fuel setup and size of turbo it would take to make that sort of boost without getting way out of it's VE zone would result in an engine that was essentially an on/off switch only.
[This message has been edited by Pancake (edited 05-31-2016).]
And looking at the picture that's not intercooled and probably not setup for water or alcohol injection. That's not making 800 hp
To be fair, I can't even see in the picture where it's getting fuel from. All I see is a turbo going through the manifold straight to the head, with no discernible fuel injection or throttle plate at all. Heck, I can't even see any nitrous foggers. It could all be stealthily mounted on the bottom side of the intake, to make people looking at it think that maybe it's less than 10 PSI boost, since there's no intercooler.
It was only making 500 HP on turbo only. The 800 HP would be on turbo + nitrous. The numbers aren't unattainable for what's there.
EDIT: Actually, it looks like there is a custom intake manifold, with a carb mounted on it, which is way over behind the passenger headlight, and before the turbo, so the fuel and nitrous are all being mixed in, prior to going through the turbo. I'm surprised it hasn't blown up.
[This message has been edited by dobey (edited 05-31-2016).]
EDIT: Actually, it looks like there is a custom intake manifold, with a carb mounted on it, which is way over behind the passenger headlight, and before the turbo, so the fuel and nitrous are all being mixed in, prior to going through the turbo. I'm surprised it hasn't blown up.
That's almost like the "homogenizer" in Smokey Yunick's Fiero with the "hot vapor" Duke engine. Too bad Smokey didn't have an SD4 to work with when he was developing this. http://www.hotrod.com/how-t...iero-hot-air-engine/
[This message has been edited by fierosound (edited 06-02-2016).]
A 4-cylinder Fiero belting out only 370 bhp took the NHRA's Competition Eliminator title at the Keystone Nationals on September 15, 1985 with a best 1/4-mile time of 9.72 seconds at 134.41 mph.
As for SD4 power, The drag race car built by the Rod Shop hit 550hp normally aspirated using alcohol fuel. Vanderley Engineering use to build SD4's for the race teams and sell engines for street use. They started at 232hp for fuel injected and emission compliant 2.7L version and a 285hp with a 4-bbl carb non-emission compliant 2.7L (it had a larger cam and higher compression). It was around $10k for the 232hp version and $12K for the 285hp version. Not to mention they would build them to suit. You could get the engines in 2.5L, 2.7L. 3.0L, and 3.3L.
That is an amazing car and a beautiful paint job. I would love to have an SD4 fiero GT like that.... It must have sounded amazing running on alcohol like that too
Pete
------------------ "May the grins begin when you turn the key and hear the engine roar over your shoulder" ......Gall57 (slightly modified LOL)
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