[ihatesissycars]

Hi all!



Wicked forum! I've joined up as I have a 1983, 2.5 Porker 944 into which I want to put a 968 motor!



I've started changing several brake and suspension components for upgraded items in prep for the motor transplant and to turn it into an even better drive than it already is!



Now, I didn't plan on doing this change for a while yet but yesterday I discovered my water pump is leaking and looking at the cost of that (about £200 for all the parts plus my time which I don't have alot of at the mo!!!) I'm thinking I may start the change sooner.



Does anyone know what I need to put the bugger in? I wanted to keep the 968 clutch, flywheel and bellhousing but the word around the campfire is that I can't use them? Does anyone know for sure?



Also, wiring! I have the complete loom from the 968 inc ecu so its all there its just what do I need to splice into to power it up and get it running?



And lastly, the rad, my 2.5 rad is new, do you think its up to the job?



Thankyou all in advance!

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[PorscheDude]

You will need the 968 torque tube if you want to use the 968 clutch and bell housing.

Another option is to use the S2 clutch and flywheel, which would allow you to use the standard TT and not have th deal with the heavy expensive DMF.



Here you can find the 944 schematics

http://www.eucc.dk/manuals.htm



Here you can find the 968 manuals.



Good luck, it should be pretty straight forward.

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[ihatesissycars]

Ahh! So s2 clutch and flywheel, my present bellhousing and hey presto!



Sounds like a better route as a DMF is just another thing to go wrong eh!



Thankyou for your help!

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[ihatesissycars]

What about just sticking a 968 tt in there, would that fit my gearbox?



Radiators. . . .



D'you reckon my std 2.5 one would be up to it? Or maybe change to a 2.5 turbo rad (I'm assuming it fits in the same space) if its different?

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[PorscheDude]

The 968 tt will work with your 5 speed but to use the 968 tt you would have to keep the 968 clutch components (bell housing, clutch, dmf) This make clutch jobs in the future alot easier.



Not sure about radiators. A 951 rad should do the trick.

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[ihatesissycars]

Awesome!



Is it much bother to change the tt? A quick goosey gander under there makes me think it just the bolts on the box end then out it slips?



Is it just a slid in spline shat on the box end too and will the box fall out if I take the tt out?



Sorry for all the Q's but I've never worked on one of these before!

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[jfrahm]

You need a 16v 944S or S2 bellhousing and flywheel if you want to use a 944 torque tube. The NA bellhousing has the wrong sensor setup and the NA flywheel has the wrong number of teeth for the sensor.



I actually have these parts, leftover from my old spare S2 motor, but shipping to the UK might cost a bit.



There are a few wiring issues to sort out (alarm/disabler to ECU) and you'll want the ignition control unit if you don't already have that.





Oh, the TT is hard to birth unless you already have the trans and rear suspension out. It might be easier on some cars (early?) that do not have the hooks on the TT to control crushing in an accident.



Re: radiators, I think the S2 and 968 use the Turbo radiator with one of the water necks capped off. I do not know if the NA radiator is smaller or just lacking some of those fittings, but I believe it fits fine.





Good luck, sounds like a fun swap!

-Joel.

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[ihatesissycars]

Ignition control unit. . . . .



The ecu controls the ignition doesn't it? A simple coil, capr, leads and arm and the ecu triggers the coil?



The same as the 2.5 n/a engine I already have.

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[PorscheDude]

[quote name='jfrahm' post='41526' date='Sep 21 2007, 11:22 AM']You need a 16v 944S or S2 bellhousing and flywheel if you want to use a 944 torque tube. The NA bellhousing has the wrong sensor setup and the NA flywheel has the wrong number of teeth for the sensor.



I actually have these parts, leftover from my old spare S2 motor, but shipping to the UK might cost a bit.



There are a few wiring issues to sort out (alarm/disabler to ECU) and you'll want the ignition control unit if you don't already have that.





Oh, the TT is hard to birth unless you already have the trans and rear suspension out. It might be easier on some cars (early?) that do not have the hooks on the TT to control crushing in an accident.



Re: radiators, I think the S2 and 968 use the Turbo radiator with one of the water necks capped off. I do not know if the NA radiator is smaller or just lacking some of those fittings, but I believe it fits fine.





Good luck, sounds like a fun swap!

-Joel.[/quote]



Do you have an S2 harmonic balancer you would want to part with?

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[jfrahm]

[quote name='ihatesissycars' post='41527' date='Sep 21 2007, 09:22 AM']Ignition control unit. . . . .



The ecu controls the ignition doesn't it? A simple coil, capr, leads and arm and the ecu triggers the coil?



The same as the 2.5 n/a engine I already have.[/quote]





The 16v cars use a big old transistorized switch (32v 928's got two of them) to switch the coil, controlled by the ECU. I think it is bad luck to use a standard setup with the 16v ECU. It might not actually work, or it might be rough on the ECU or who-knows-what. The ICU has a chunk of alu on it to heat sink it to the chassis. You might find the same part on any number of cars with similar systems. Be advised there is a non-Bosch replacement module that is somewhat cheaper that at least one 928 owner had trouble with, as in it did not run well until a Bosch was put in. Since you will have enough problems I'd suggest the best. :-)



-Joel.

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[jfrahm]

[quote name='smokiemon968' post='41529' date='Sep 21 2007, 09:44 AM']Do you have an S2 harmonic balancer you would want to part with?[/quote]



Nope, sorry.

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[Peter Empson]

On my S2 engined 944 2.5 I ran the original rad with no problems at all, it was fine over quite a few miles and trackdays, even in the summer (but this was the UK!). I have recently had the S2 rad fitted as we suspected the original was leaking (it wasn't) and noticed no real difference in temps. I have kept the original single fan as it was lighter than the S2's twin version as it seems to do the job perfectly (it also saved having to uprate the current rating of the wiring to it).

Hope this helps.

Best regards,

Peter

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[josephsc]

I run a 951 radiator, as well an external oil cooler -- but more for safety of mind than anything else. The car ran like champ on a couple of hot-day track days with two drivers switching off in different run groups.

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