is it possible to use a 3.0 head on a 2.5 951 block?or vise versa?

 

Funny that this subject just came up... I was wondering the same just last week or so.

I e-mailed Powerhaus, and for 500 hp, it will cost about $30k... parts and labor.

If I recall correctly, $15,000 would get you 350 hp.

I sure wish I had an extra $30k... a 500 hp street legal S2 sure would be awesome!! Not much out on the street or the track that could touch that!!

 

That's a lotta money...but for $30k plus maybe the $10k cost of the car...you'd have a car that would probably run with 911 twin turbos for under half the price...If I had that kinda money I'd probably get it done!

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by rsrdan:
<strong>And dont forget about your insurance company.They still think its a stock S2.... hah hah hah!!</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">yeah, thats all they'll pay you for too when you crash it. spend the money on learning how to drive, THEN get a turbo. it'll pay off much more in the long run.

Mike, happy with my 84

 

I'm with the naysayers...What about clutches, difs, half shafts, torque tubes, gearboxen...? I'm not a big fan of engine mods. Might as well spend your money on a bombass 951. Then you get the free "turbo" sticker on the back and the chicks know to percolate.

In any event, <a href="http://www.junkyardjet.com/index.html" target="_blank">there are a number of ways to add more power</a> in every price range.

 

We have done it, to S2's and 968's...its very reliable. Its not anything near 50 large to do the job either. We do not offer a kit, we need your car at the shop, but your looking at 8-12K depending on the options and boost you want to run.

Take Care!

 

John, what mods have to be done to keep it reliable? I know the 3.0L motor has a 10.9:1 compression, and I figure that is just too damn high for a turbo motor without some serious work.

 

Anyone on the board who's done it and thinks it was worth the money? Speak up!

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Tremelune:
[QB]I'm with the naysayers...What about clutches, difs, half shafts, torque tubes, gearboxen...? I'm not a big fan of engine mods. Might as well spend your money on a bombass 951. QB]</font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">The S2 is basically the same car as a turbo. It only has a different engine and final drive ratio (I think 5th gear is also a different ratio). Same suspension, brakes, trans, etc.
For a turbo conversion you could use mostly 951 parts. You would need to modify the intake manifold which I believe John Anderson (AMW) and Tim Richards (SFR) have done. You would also need a re chipped 951 DME & KLR. The big money would be for lower compression pistons but the rest would not be that hard of a job.
Think of a 951 with a little more low end torque from the 3.0 liter and the better breathing 16V head.

 

I am in the process of doing a similar turbo conversion. I am using a 2.7l engine instead of the S2 motor. So far the biggest expense has(will) be the crankshaft, rods, and pistons. Have not desided on whether to go with a DME/KLR set up or a standalone system which will be a pretty penny. Once done I will let everyone know total cost vs. hp gained.

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Tremelune:
<strong> Then you get the free "turbo" sticker on the back and the chicks know to percolate.
</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Damn....THAT'S where I've been screwing up! <img border="0" title="" alt="[Wink]" src="wink.gif" />

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Peckster:
<strong>We're all getting tired of people talking about doing it!</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Speak for yourself. You're getting tired of people talking about it.
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica"><strong>So, just do it, already!

As soon as someone actually does it and is happy with it, we'll stop being negative.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">S2 has never been turbocharged?

I beg to differ. Actually I don't beg...you're just being 'negative' for no reason because it's been done and people are happy. John turbocharged an S2 and when John wanted to lower compression he couldn't even get the guy to bring the car back to the shop...he was always having too much fun driving it.

 

I repeat:

Anyone on the board who's done it and thinks it was worth the money? Speak up!

 

Peckster,

Done what? Turbo'd an S2? Send me your email and I'll send you a tele number of man that has put about 15K miles on a turbo'd S2.

I repeat:

Send me your email, and I'll send you a tele number of a man that has put 20K miles on a turbo'd S2 (he drives fast...ok)

Take Care!

 

Porsche didn't use the 16V head on the 968 Turbo S. Now there must have been a reason for that because ALL 968's are 16V, therefore the head is not suitable for Turbocharging IMHO. However, there are turbo's 968's and S2's out there, so maybe porsche were being over cautious. The Turbo 8V head has coated ports to cope with the extra heat.

I the US you are unfortunate that the turbo production stopped so early. In the UK we had the 952 ('cos it's RHD) until '91 and the S2 until '92. It would be much easier and a better bet to use the 3 litre block and crank in a Turbo, with custom rods and pistons, mated to all the other 951 running gear. The UK late turbo is basically a Turbo S, so it makes an ideal car with it's bigger brakes, LSD etc.

The 8V head is not a straight swap onto the 3.0 block. There is a waterway mismatch at the front of the casting that needs modification that I know about already and could well be other problems. It can be done though and I would suggest is easier than trying to fit a Turbo to an S2.

Then again the early 951 with 220bhp stock was basically the same car as the S2 in terms of running gear, and you could find one with LSD. You'd probably want to fit bigger brakes no matter what your donor car.

Perhaps if you have an S2, buy a 951 motor and make something up from the two. When you tear both down you should be able to see where any problems are.