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Discussion Starter #1
Hi,

I remember reading a thread ages ago discussing the differences between the Arese (Busso) 3.2 V6 as installed in the 147GTA/156GTA vs. GT 3.2/GTV 3.2/166 3.2.

Was the conclusion that the only difference was the mapping, i.e., a sales decision? Possibly with the GTA's running a bit richer, and with a higher rev limiter? I also seem to remember somebody saying that the Arese V6 runs rich at the high end anyway, to aid cooling.
 

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I thinkthe GTA has diferent cams but could stand corrected
 

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Cams are exactly the same.

There is no mechanical difference between any of the old 3.2V6 engines.
 

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Discussion Starter #4
Cams are exactly the same.

There is no mechanical difference between any of the old 3.2V6 engines.
Even on the intake or exhaust side? I'd imagine the configuration must be very similar in the 147GTA and GT - they also share ASR and VDC, so the electronics package is likely to be of similar vintage. Do they share an ECU, i.e., main body computer vs. ABS ECU.
 

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Discussion Starter #6
It's just mapping. I've spent hours (as have others) confirming this.
Right. So I also seem to remember that the 240bph mapping seems to quite consistently give 240bhmp, but the GTA 250bhp could often be ~245bhp when tested?

P.S. I found the old thread here:
http://www.alfaowner.com/Forum/engines-ts-jts-jtd-and-v6/82141-difference-between-gta-and-gt-3-2-engines.html
which has more detail than I remembered...

and the comment from Trailbraker from 2007:
"None of this matters too much in the real world.
I imagine a remap would close the gap, but I had read long ago that an Alfa engineer said the GT's pretty front spoiler design couldn't ram as much air as the the larger (but not as pretty) GTA's one and thats why the engine was tuned lower. Presumably they also wanted to avoid cooling problems that plagued the development of the 147 GTA, and caused it to be released later than an anticipated with a reworked oil cooler..
"
 
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Right. So I also seem to remember that the 240bph mapping seems to quite consistently give 240bhmp, but the GTA 250bhp could often be ~245bhp when tested?

P.S. I found the old thread here:
http://www.alfaowner.com/Forum/engines-ts-jts-jtd-and-v6/82141-difference-between-gta-and-gt-3-2-engines.html
which has more detail than I remembered...

and the comment from Trailbraker from 2007:
"None of this matters too much in the real world.
I imagine a remap would close the gap, but I had read long ago that an Alfa engineer said the GT's pretty front spoiler design couldn't ram as much air as the the larger (but not as pretty) GTA's one and thats why the engine was tuned lower. Presumably they also wanted to avoid cooling problems that plagued the development of the 147 GTA, and caused it to be released later than an anticipated with a reworked oil cooler..
"

A well maintained and times GTA engine will give 250+ bhp, Mine gave 258bhp and some others on here too.
 

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Discussion Starter #9
I dont own a GTA but I know that GTA engines require a different cam lock from other 3.2 engines when the cambelt is changed. The owner of NJS Alfa specialists told me this so there may be a difference in the camshafts.
Well, I think mine was changed with GTA cam locks, and the marks apparently lined up afterwards, so....
 

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Alfa Romeo Servicing UK - Auto Lusso - Service your Alfa Romeo Hertfordshire and Bedfordshre

Have a look toward the bottom of the page in the servicing. Refers to specific camlocking tools for GTA's.

BTW, Neil Smith who runs NJS has been the Alfa Racer Champion and what he does'nt know about Alfas isnt worth knowing.

We have two variants of V6 cam locks, 2.5/3.0 and ALL 3.2.

GT/166 is the same as 147/156 GTA so I don't understand why your specialist has said what he has. The website could be clearer but we see far more GTAs than we do GT V6s or 166 3.2s.
 
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Its just the wording on the website, not meant to be taken literally. They should be referred to as 3.2 cam locks to be clearer.. :)
 

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The 250 hp GTA engines have a round green/white sticker on the cam belt cover with 'GTA' written on it. This indicates that at the Alfa factory they make a distinction between the
250 hp unit ( to be fitted only in a GTA ) and the 240 hp unit. And when you order an exchange 3.2 engine at Alfa ( which is a bare block ) there is also a price difference between the 250 hp unit and the 240 hp unit ( the latter is actually more expensive ! )
Cams and timing are the same on all 3.2's (The intake cam has only more duration than a 3.0 cam. The exhaust cam is exactly the same as a 3.0 as is the timing )
 

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250 hp unit ( to be fitted only in a GTA ) and the 240 hp unit. And when you order an exchange 3.2 engine at Alfa ( which is a bare block ) there is also a price difference between the 250 hp unit and the 240 hp unit ( the latter is actually more expensive ! )
Do you know why that is?

I do;)

The engines themselves are the same

And yes by the way the locking tools are the same for all 3.2's

Ned
 
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