Jolly Green

Renegade hybrids has an excellent conversion kit for the 944. I could see that it might actually be worth it. The LS1 is fairly inexpensive and reliable. It would still use 87 octane and you could do alot more mods if you ever wanted to. The only thing I dont like about it is it seems so... vulgar maybe? Its a Porsche and your going to put a big, fat, american V8 inside. Its your car though, just giving you ideas.

Potomac-Greg

I might use a "softer" word than "excellent." It's certainly nice to have a moderately well sorted kit, but if you read up on 944 conversions, you will need to be good with a wrench (or checkbook) to get it done well.

Cole

Neither one are fast by today's standards.....which was the point.

I just can't imagine getting in a 79 928 and actually thinking it is fast anymore. There are mini vans that put down better 0-60 times today than the 928 did new.

whalebird

A '79 928 is fast. You just don't know it. The cars would cover ground at an alarming rate with absolutly no drama. They feel slow, but a 0-60 race is not it's intent. They would go 160mph and you could listen to the radio on low volume.
There is nothing that fast - that luxurious, or that luxurious that is as fast. I've driven many of each different version of the 928 and a '77 was arguably the swiftest of them all.

Cole

I ownws a 78 928 for 109,000 and it was only fast for its day. My 2000 Audi S4 would kill it in both acceleration and luxury hands down in stock form.

Face it. The 928 is a great car, a wonderful classic but by modern standards not fast.

Rock

77 is a dog, but my neighbor had a 95 928 S4 or GTS (cant remember). It was a manual. That thing moved.

Rock

EMS wont do it, youre better off SMT6ing the motronic system. Pistons wont do that either, the 88+ N/as had higher compression pistons. They got like 5 hp over stock.

The 968 engine is a 3 litre, has DOHC, 16 valves, Variocam, dual resonance intake and they got ~240hp.

There is just not that much power to be found in an 8 valve 4 cylinder N/a motor.

Cole

Darn phone.....can't correct my typing errors in the previous post

Lorax

Actually they gained 8hp by raising the ratio by .5

I'm talking about raising it 8 times that much... big difference. Also running much more aggressive timing. 50bhp can easily be found that way.

a piggy back like the smt6 falls under "EMS" (my point is that the factory system is not going to cut it)

Lets say you have a factory high CR car (~10:1) and lets just say that for every .5 increase in CR you gain a conservative 5hp. .5(8) is 40. That's 40 hp for a 14:1 CR motor. That's 195hp by itself. Now if you want to go further drop tons of dough on some headwork, plus a good cam and stronger rods to turn higher RPM's.. etc etc

LP944

Still, compared to my 944 it is faster in acceleration.

LP944

But they are still a bargain for what they can give for the price they are advertised.

ritzblitz

Ryan, I totally agree with you. There is a certain black 944 I've seen in person making tons of hp at 9000rpm. 2.5l 8v. It wasnt cheap, but it can be done. Also using motronic...

white924s

This is assuming that increasing the CR will linearly increase HP - it won't. Unfortunately, you can only make an engine so efficient, so holding other variables (eg intake work, exhaust work) constant, you'll see decreasing returns from increases in compression ratio. In other words, you'll get more increase from 10-10.5:1 than you will get from going from 12:1 to 12.5:1.

So will increasing static CR to 13:1 or 14:1 make a noticeable difference? Yes, i'm not trying to say otherwise. WIll you get 195hp without increasing airflow into and out of the engine? Highly doubtful.

That being said, can you increase airflow into and out of the engine over a stock setup? Absolutely, and replacing the old motronic system with a modern engine management system will help make a setup like that last longer than 20 minutes

Lorax

Raising compression ratio doesn't change the amount of air or fuel used, so how does your intake or exhaust effect it at all?

Sure there is a point of diminishing returns, but 14:1 isn't it.

Look at diesel engines, some of them are as high as 20:1 compression

Lorax

Nothing wrong with motronic, a piggyback system paired with motronic does just fine for most purposes.