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-   -   First drive, 3.2 swap (http://forums.pelicanparts.com/porsche-911-technical-forum/452215-first-drive-3-2-swap.html)

Scooter 01-21-2009 12:22 PM

IMHO: you will not likely get the neck-snapping response with a 3.2 Motronic. If you have carbs, now that is a different story. Also, your Boxster S is rated at 5.6 seconds 0-60, which is pretty darn fast. Your 3.2 in the early car just may not provide equivalent times.

That being said, I think you will be perfectly happy with your setup once you get it dialed in.

crashr 01-21-2009 01:10 PM

I had the exact same issue with my 1975 2.7 to 87 3.2 conversion. I found that my linkage cable between the transmission and the throttle linkage was originally to long by about an inch. I cut open the looped area at the transmission side of the throttle rod and bent it to proper length. Unfortunately ths was a temporary fix and the rod later snapped where i bent it. I went and bought a used throttle rod from a mid year car that had a 915 and 3.2 engine for about $20 bucks at my local Porsche parts yard. Put the cable on and it fit perfectly. Don't forget that the newer linkage will ahve a spring clip that needs to be removed before pushing on the engine side of the linkage.

I hope this helps.

dmcummins 01-21-2009 06:01 PM

I did't get a chance to work on the car today and it will probably be a couple of days till I do. I though I would show a pic of my 02 location to see if this was OK .

http://forums.pelicanparts.com/uploa...1232593018.jpg

Also I was not sure what to do with what I assume is a small vacume line running out the back. On one side is a line that loops back somewhere and is attached. The other side, the clear/yellowing line I just pluged.

http://forums.pelicanparts.com/uploa...1232593199.jpg

Is the clear/yellowing line suppose to go to something that I need?

dmcummins 01-21-2009 06:07 PM

Quote:

Originally Posted by stlrj (Post 4432810)
At the very least, the mixture should be checked and corrected per factory adjustment values.

Extremely critical yet mostly overlooked and forgotten.

What would I need to do this myself?

mjshira 01-21-2009 06:35 PM

what trans are you running? 7:31 box?

mjshira 01-21-2009 06:37 PM

Quote:

Originally Posted by Scooter (Post 4432828)
IMHO: you will not likely get the neck-snapping response with a 3.2 Motronic. If you have carbs, now that is a different story. Also, your Boxster S is rated at 5.6 seconds 0-60, which is pretty darn fast. Your 3.2 in the early car just may not provide equivalent times.

That being said, I think you will be perfectly happy with your setup once you get it dialed in.

a 3.2 early car with a 7:31 box and dialed right will beat that boxster. something is not right here.

jclporsche 01-21-2009 08:23 PM

I see your problem, some po welded the exhaust outlet shut!:D

http://forums.pelicanparts.com/uploa...1232593018.jpg

stlrj 01-23-2009 06:39 AM

Quote:

Originally Posted by dmcummins (Post 4433572)
What would I need to do this myself?

A CO meter and a spec book.

dmcummins 01-23-2009 10:56 AM

Thanks, I'll start looking into meters so I can see where I'm at. I have the linkage adjusted to where I get idle and full throttle. I ended up changing the linkage from the engine to the trans mount. The one from the 73 must be a tad shorter. All this has helped and I took it out for a 30-40 mile drive and put some fresh 93 octane gas in it also. It starts right up, and no smoke, or leaks so far. My oil guage reads high as I knew it would since I didn't change the sensor. And my tach doesn't work, but it didn't work before the swap.

As I said before, the car starts right up and runs very smooth. Cruising along at 70 it just hums. There is no stumble or flat spots, it just doesnt pull as hard as I would expect. I think I am just missing something. It runs fine as it is, better than the 2.4, but not as good as the boxster.

dmcummins 01-23-2009 11:00 AM

Here it is next to my Boxster. Its interesting how much smaller the 911 is compared to the Boxster.

http://forums.pelicanparts.com/uploa...1232740782.jpg

911 tweaks 01-23-2009 11:34 AM

you need a car lift in that garage along with a ton of tools and junk all over the place... ;-)

dmcummins 01-23-2009 12:00 PM

Quote:

Originally Posted by 911 tweaks (Post 4437667)
you need a car lift in that garage along with a ton of tools and junk all over the place... ;-)

I work on the cars and keep my junk and tools in the basement.



http://forums.pelicanparts.com/uploa...1232744328.jpg

pozee 01-23-2009 12:39 PM

dmc,

I'm sure you're not getting everything out of the 3.2 based on what you have stated. Just curious if you have driven a 3.2 and compared?

dmcummins 01-23-2009 01:14 PM

Quote:

Originally Posted by pozee (Post 4437845)
dmc,

I'm sure you're not getting everything out of the 3.2 based on what you have stated. Just curious if you have driven a 3.2 and compared?

Only 3.2 I have driven is the Boxster. I'm sure I'll get it sorted out, If all else fails I'll take it to a shop. I'm just planning on that being the last resort.

DW SD 01-23-2009 01:50 PM

I drove an 88 3.2 and it felt fat and sloppy compared to my lightweight early car which had a 3.2 (it now has a 3.6). The 3.2 ripped in the early car. My 71 RSR interpretation weighed 2180 lbs when I was done with a few gallons of gas. I removed most everything I could without being extreme. I think the later carrera was pushing 2800 lbs. The difference in weight is meaningful.

I think something is wrong. Did you do a compression or leak down test?

I wonder if your exhaust is too restrictive?

Doug

dmcummins 01-23-2009 02:11 PM

Quote:

Originally Posted by DW SD (Post 4438058)
I drove an 88 3.2 and it felt fat and sloppy compared to my lightweight early car which had a 3.2 (it now has a 3.6). The 3.2 ripped in the early car. My 71 RSR interpretation weighed 2180 lbs when I was done with a few gallons of gas. I removed most everything I could without being extreme. I think the later carrera was pushing 2800 lbs. The difference in weight is meaningful.

I think something is wrong. Did you do a compression or leak down test?

I wonder if your exhaust is too restrictive?

Doug


I did a leak down test on the engine stand cold. All were less than 5% @ 100psi.

I have read where others have used the early heat exchangers and didn't seem to be a problem. I have an old ANSA muffler I guess I could try out. This is the first car that I used the two out muffler that is on it now. I bought it a few years ago and never used it. Its not that quiet, if that means anything.

IROC 01-23-2009 02:29 PM

I swapped a 3.2 into my car (replaced a stock 2.7) and I have seen both sides of this fence. The 3.2 isn't orders of magnitude faster than the 2.7 (my lap times back that up at various tracks). It seems the 3.2 needs to be driven differently or at least the 3.2 needs to be driven hard to really get the most out of it - especially for it to feel a lot faster on the street.

FWIW, my car with the 3.2 will out-pull a Boxster S. Me and a friend did a little rolling drag race (in a safe place, I assure you) and I quickly pulled out ahead of him. I know, because he laughed when it was obvious that I hit the rev limiter when I was ahead of him. Oops. :)

robert walsh 01-23-2009 02:41 PM

I still feel the 3.0 has a better response and feel than any 3.2 I have driven a latae 80's carrea, however that aside, a 3.2 boxster S wil win the race, primarily due to enhanced driveline components that come over time. The boxster is a quicker car, but I still prefer the earlier 911 with either a 3.2 or , to me, a preferred 3.0. It is just a more classic sports car feel as well as visual that cannot be touched.

CharlesJones 01-23-2009 06:13 PM

Quote:

Originally Posted by Scooter (Post 4432828)
IMHO: you will not likely get the neck-snapping response with a 3.2 Motronic. If you have carbs, now that is a different story. Also, your Boxster S is rated at 5.6 seconds 0-60, which is pretty darn fast. Your 3.2 in the early car just may not provide equivalent times.

Interesting point, but I thought Motor magazine timed an early 3.2 at 5.3 seconds for 0-60? That's faster than a boxster, and an early car with a 3.2 engine should be lighter and faster still.

As others have said, I'd guess your 3.2 isn't set up right. If you had to tap the injectors to get them to open up initially that would suggest to me that there will be other components in the injection system which aren't at their prime. Also, a euro motor with an O2 sensor is a bit of an odd ball - not sure what's going on there, but it suggests that some sorting out the injection system and the motronics set-up is needed.

My '84 really scoots like a raped nun by the way, but I have to keep it singing the right side of 4K to get the best out of it. I expect a modern boxster would have more low down torque, which might be part of the cause with your slight dissappointment when comparing it to your boxster.

Rot 911 01-23-2009 06:21 PM

I think you need to drive another 3.2 so you have a base line as to what to expect from your conversion.


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