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My 16v conversion thread

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Old 10-18-2011, 03:21 AM
  #16  
944J
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nice...

what's the average & max HP/TQ for my 3 options with pump gas for a street car?
Old 10-18-2011, 03:29 AM
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Paulyy
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Originally Posted by 944J
nice...

what's the average & max HP/TQ for my 3 options with pump gas for a street car?
it really depends on the turbo, boost, rpm limit, compression ratio, tune and more.

duke got over 500 rwhp on pump with a 968 16v turbo engine.
Old 10-18-2011, 03:33 AM
  #18  
944J
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I know it depends on certain variables but when you say max and average it takes into account all of those variables. I'm not asking for exact I'm just wanting ballpark. It still seems more cost effective to use a V8 over a 16v 944/968 engine.
Old 10-18-2011, 05:06 AM
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Raceboy
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Originally Posted by 944J
It still seems more cost effective to use a V8 over a 16v 944/968 engine.
Yeah, but then it wouldn't be a Porsche anymore, but Porvette or something.
Old 10-18-2011, 07:02 AM
  #20  
JET951
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Its looking good Sid,
When i did my exhaust for our 16v turbo i used the S2 flanges but basically the rest was turbo headers and crossover. i did it that way so i could keep the stock flexi joint on there. and the standard crossover would line up perfectly. i will dig up some pictures if you want.
Sean
Old 10-18-2011, 08:35 AM
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Olli Snellman
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Interesting project. We have also planned similar mod to son's project car. I have more or less all necessary pieces for my own 3.0L 16V turbo engine.
Old 10-18-2011, 10:38 AM
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Sid why not delete the AOS? I did it makes all the different in the word. Its super easy to install.
Old 10-18-2011, 10:58 AM
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^^^^^^^ what he said.
Old 10-18-2011, 11:35 AM
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Very cool Watching with enthusiasm.
Old 10-18-2011, 11:55 AM
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pettybird
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Originally Posted by Raceboy
Yeah, but then it wouldn't be a Porsche anymore, but Porvette or something.

'cost effective' and 'porsche' rarely work in the same sentence, either.


I've lusted after a 16v setup for a while but don't have the fab skills...good luck!
Old 10-18-2011, 04:45 PM
  #26  
fortysixandtwo
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Originally Posted by blown 944
I did some fitting tonight and I think I may just use the flanges from the 951 headers that mate to the crossover. I cut the flanges off the s headers and mounted them up to the head and it looks like it will be VERY straightforward and easy to mate them together.
I'm also taking the intake in to work and having a co worker send it to the guys he uses to cut his intakes.
I did the same thing on mine. Cut the 951 collector flanges off a set of junk headers and had them welded to the 968 headers. No extra material needed to be added, since I left a stub of 951 header on the flange.

For the 16V intake, I just used a reciprocating saw, final fitment for welding was done with an aluminum compatible cut-off wheel. Using more substantial equipment would have made it easier and cleaner looking.



Originally Posted by blown 944
For now I'm going to use the stockers.
I havnt even looked up the specs yet. In the process I will probably find something about using twin cam gears so I can get them dialed in the way I want. For now though I just want to get the fab work done.

The head flows so much better than the 8v that it shouldn't matter too much how big the cams are as long as they can be timed to have wide lobe separation and minimal overlap.
I had considered making a manually adjustable version of the 968 tensioner, so that the intake cam could be set at a static advance or retard. In the end, I just went with the 968 tensioner, but this might be something to look into.
Old 10-18-2011, 07:16 PM
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blown 944
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Do you have any pics of the intake?

I'm trying to find a few of other builds but they seem to be few and far between.
Originally Posted by fortysixandtwo
I did the same thing on mine. Cut the 951 collector flanges off a set of junk headers and had them welded to the 968 headers. No extra material needed to be added, since I left a stub of 951 header on the flange.

For the 16V intake, I just used a reciprocating saw, final fitment for welding was done with an aluminum compatible cut-off wheel. Using more substantial equipment would have made it easier and cleaner looking.





I had considered making a manually adjustable version of the 968 tensioner, so that the intake cam could be set at a static advance or retard. In the end, I just went with the 968 tensioner, but this might be something to look into.
Old 10-18-2011, 07:39 PM
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fortysixandtwo
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This is the only one I have uploaded.
https://rennlist.com/forums/8717863-post17.html

Like the posts says, it was put together quickly to get the car on the road. I've started to smooth the welds down and use filler to make it look less, um...garage fabricated, and more stock looking. It's going to get spray bombed in black wrinkle paint too.

The throttle body is a BBK 75mm made for fox body 5.0 mustangs. I picked it up before they were making universal models.
Old 10-18-2011, 08:17 PM
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blown 944
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Thanks, it looks like the 968 manifold is much more fab friendly. The s manifold has the tb in the back and the runners come up at a 45 degree. It looks like I'll have to cut them right where they meet the plenum and build from there.

I am going to delete the aos so that'll free up some room.
Old 10-18-2011, 08:30 PM
  #30  
JET951
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Hey Sid,
Dont forget the S intake manifold is magnesium, only the S2 and 968 are straight alloy. i dont think you will be able to weld the S intake.
Sean


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