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Turbo engine minus turbo, is it the lux engine?

O

ocallen

New member
I'm presuming the turbo engine started as the 2.5 as in the lux, what upgrading did it receive before the turbo was fitted and did this produce more power than the standard 160 +- bhp than the lux ?

Alternatively has anybody run their turbo with the turbo disconnected?

I'm still trying to get all the info I can on the engines in our cars before I go and do my upgrade. Any information I will be grateful for.
 
The 2.5 turbo engine uses lower compression pistons ; off boost it's far less capable than the 2.5 normally aspirated engine.
 
I always liked the look of this picture which sums up (to some extent) what changes were made:

Ad-951differences1280.jpg

 
Damon,

Superb picture - thanks. Looking at it explains quite a lot about the way the car works - very educational!

(I've saved it for personal use too.)


Oli.
 
ORIGINAL: ocallen

....Alternatively has anybody run their turbo with the turbo disconnected?....
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Yes but most can't. The standard Turbo engine needs the air flow meter talking to the ECU to work. The AFM is up stream of the of the turbo so no turbo no AFM engine no work. (as Paul Smith will confirm when we went to Donnington and his Turbo became disconnected by virtue of a disengaged intercooler pipe)

My car doesn't have an AFM but works on MAP (Manifold Absolute Pressure) as a result it will still run even if the intercooler pipe is disconnected (As Paul McN will confirm when we went to Donnington)

With MAP you do get a noticable pop (at the time) and drop in power when the engine decides it no longer wishes to be a Turbo. Lower revs there is no differnce as the Turbo isn't boosting in normal use and I wouldn't run heigher revs with the manifold sucking in unfiltered air so can't really comment.
 
You do realise that Donington is a lot more fun with the turbo connected, don't you chaps?
 
ORIGINAL: Fen

You do realise that Donington is a lot more fun with the turbo connected, don't you chaps?
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Can someone say something about the fact that S2's are even more fun than Turbo's but don't have turbo's to be connected here please?

I can't be bothered right now ...


Oli.
 
Just look at the weight of all those extra bits the Turbo has! If they'd have left them off they'd have been much quicker. [;)]

Paul, did no one tell you that hoovering inside your car whilst on track at full throttle is not the done thing [:D]
 
Paul, did no one tell you that hoovering inside your car whilst on track at full throttle is not the done thing
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It does sound a bit like a Dyson, doesn't it....[:D]

The sound LIL makes at full throttle is actually quite wonderful. Somewhere closer to a fighter jet than the usual bassy "I wish I had a Mustang so I fitted this 12" exhaust on my Nova" that so many people seem to think sounds good. I guess I'm used to a buzzy little Japanese Boxer engine, but it sounds a lot more like a race car than any other 944 I've known.

Watching the video it makes you realise just how little of the lap seems to be using any revs at all. I was in John's car, and he wasn't exactly hanging around once the rear-engined things got out of the way. Later on Paul and Tony had their own little "head-to-head" for a good number of laps, and they were genuinely up to the pace of the GT3s on track. Makes you wonder why Porsche never persisted with the FWD transaxle cars until now!
 
ORIGINAL: pauljmcnulty
Makes you wonder why Porsche never persisted with the FWD transaxle cars until now!
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Mr McNulty, I'll be generous and put this down to a slip of the tongue (/finger) this time, and ignore the fact that you are both a mod 'round here and the membership secretary for the 944 section of the Porsche Club of Great Britain.

Don't do it again. [:-]


Oli.

(Edited to add a smiley, 'cos it was far too fierce without one!)
 
Don't do it again.
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I will resist the temptation to edit my post and make you look foolish! [;)]

I meant front-engined. Obviously slightly different to FWD. Slightly....[&o]

Glad to see you're paying attention at the back!
 
ORIGINAL: Diver944

Don't worry Oli, if he edits it I'll just change it back again :ROFLMAO:
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And then I'll put in something even sillier.........although I am struggling to think of anything sillier. [8|]

To get back to the OP - Don't bother.

Many of us who first had a Lux have pondered if it was worth upgrading it to a Turbo. It isn't. The sum of the parts is far greater than the difference in price between the two cars. Just sell the Lux and get a Turbo or, better still, have both.
 
That is a brilliant photo.

I'm gonna get the running gear on my S2 looking like that. Thats it, I'm doing it.

New 2 post lift coming soon......
 
The more I look at it the more I struggle to understand how the torsion bar suspension works! I guess it's the brackets on the outer ends of the trailing arms that bolt to the torsion arms. Although in the photo they look like one piece, which also runs forwards and connect via the hefty rubber bush to something solid.

I presume that is not the case, and the bit that connects to the bush is a seperate piece, otherwise the trailing arm wouldn't move at all.

BUT, given the fact that the shock absorber works in the normal way (i.e. is a vertical strut from the trailing arm to the bodywork above), you'd have thought that it would be both cheaper and easier to put a spring around that, in the traditional manner. It does look like Porsche could have made it a lot simpler. I wonder why they chose the arrangement they did?


Oli.
 
Interesting that the picture shows the pistons and cam as being different but I can see no sign of the rods [&:]
 
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