Yep, with a 0.63 hot side at least.

show us the 'maths' then! (I won't hold my breath for a well informed and detailed answer)

Of course

ATP turbo has a 0.72 A/r hotside. Could be great for this set-up and top power.

I've been enquiring about the cossie style 72ar exhaust housing.... Together with either a GTX 3071r OR GTX 2876r....
Whole turbo can be had for around 1200 quids + postage....

Think the 72 housing would work great on this super charger/ turbo project!!

Nick

If I could do my rebuild etc. all over again. I would go for the GTX3071R.

Probably a good decision, as I won't be giving a maths lecture here.

Good, I knew you would fail to back up your dismissal of someone else's work (again).

OK, expert, explain to me (with maths) how it is possible to get the claimed power at 2.6 bar boost and at the same time demonstrate the power it would generate with zero boost - e.g 1 bar manifold pressure.

I am dismissing nobody's work - I cannot however accept works of fiction as fact.

I'd love to but I don't know what turbo he's using (not going to bother to find out) and as you know (maybe you don't) you cannot estimate airflow without that piece of information (let alone all the other parameters to give it a go). What I do know is the time he set at Forrestburn hillclimb and how they compare to the single seat cars there. If you don't believe that owner then join the MLR and send him a message rather then stomp your feet around another forum and get upset when your asked to explain your reasoning. You're the one who needs to justify your opinion, and if you were to do so in concise manner then I'd give your opinion some credence. Until then give up.

I am in no-way upset - believe me...

And, unlike you, I believe that claims of unreasonable/improbable/impossible/implausible power outputs are what need justifying. Demonstrating they are ludicrous is childs play - but you would understand that, as I am sure you know that airflow capability of a turbo has nothing to do with actual power achieved once installed on an engine. Turbo charging does not bring with it 'MAGIC' power - but density ratios have EVERYTHING to do with power outputs. Of course, having built and dyno'd so many turbo engines yourself you would know that...

p.s. To save you doing any research at all, Begbie THINKS he is using a huge GT42 turbo - as if that makes a difference...

Now now, people! No need for all this!

Just listen to these soothing sounds and chill out!

http://www.youtube.com/watch?v=s0z671s-XtM

BTW, go to 0:46:20 to really feel the love

To output 790hp out of a 2L and at less than 7300rpm, you need at least 3.5 bar or relative boost pressure(4.5bar of absolute boost pressure).

The big size of the turbo just help to fill in the engine at high pressure/high rpm (and that's not high rpm).

Well, I found out his engine spec, so feel free to debate about it :



The fact he runs a 100mm crank, makes me think this is a stroker engine (possibly 2.4) so I may have been wrong at the beginning when I say it was a 2.0

Ah, very soothing... but I wasn't in need of it, honestly

86mm bore and 100mm stroke makes 2323.8cc which is 16.4% larger capacity than the standard 2 litre (1997.7cc).

That would make a difference of course - but even so, claimed power and toque figures are still unobtainium. Or, at least, in the history of petrol engined motorsport NO other engine builders or racing team has ever achieved close the the claimed specific output to date - which is basically saying the same thing.

Hopefully I've managed the link.

Is this similar in claim?

http://www.norrisdesigns.com/evo3-rs.asp

I'll take a look. In doing so I had to look up the AFR for E85 and came across this, which is quite interesting:

http://ethanolpro.tripod.com/id213.html

If 790BHP is not possible at 2.6 bar it is unlikely to be possible at 2.2bar. But it doesn't say at what RPM - so I can't go any further than that.

However, I suggest it needs to be run on an independent dyno to get confidence in the real output.

That's a decent link, good stuff E85 it seems.

Not too sure about that:

http://zfacts.com/p/436.html

The fact is that you can run more advance and less rich with e85 due to the higher octane, so at full boost you don't need to run as rich as with fuel and you are able to extract more power of the e85 (compared to RON95/RON98).

On top of that, lancer evo are known to rev "easily" above 8000-8500rpm

Here's another marvelous one!

http://www.lancerregister.com/showthread.php?t=198818

Throw the turbo away and it will still make 297BHP at 7780RPM AND make 86.3 ft/lb/litre at the same engine speed. AND 102.7 ft/lb/litre at 5500! Awesome?

It'd be interesting to see your breakdown of maths in relation to the last link. Not my strong point maths, you know this, so if you can spare the time please try and lay it out where I might follow easier.

That engine will have been on an engine / chassis dyno and not on a rolling road. Not that I think it will make any difference in your opinion.

I am sure that there can be incorrectly configured/operated engine dynos as well as rolling roads...

You must be kidding? Compared to the maths you have done to calculate the optimum designs for intake plenums and exhaust manifolds, calculating simple temperature-compensated pressure ratios is an absolute doddle!

No, not kidding at all, maths I just about manage rather than master.

Thats a good schematic of the vw twincharged engine, might be more straight forward than the S4

Ok, I got another phonecall from the engine builder. And again it's bad news...

It seems that the head is gone too. The camshaft shells/bearings? are all damaged.
Also the cams themselves are gone. The lobes have a hight difference of >4.0mm!!! And one of the lobes is completely gone and is polished completely round now.
Next to that the valve guides are all damaged. Mainly on the exhaust side.

So the only real option I have is to get a new 2nd hand engine or get a new 2nd hand head.
I still want to tune the Coupe to 375, but I have to be realistic about it.
I've spend 5 years on this car, hoping the damage wouldn't be all too bad or at least fixable by forged internals.

So who can make my day/year??? I need an 16VT engine or head or a 20VT engine with the loom. And I need them cheap. The forged internals and all complementing parts cost me a ton of money already.

Don't understand why your asking for a 20 vt engine as your forged items won't fit in a 20vt engine if they've been bought for 16v!!
Think your best option is to just source a head, I managed it as my old one was also scrap!!

http://www.integrale.org.uk/cart139h/index.php?main_page=index&cPath=3_14

Seems reasonable for a refurbished unit!!

There is a delta specialist near me, I'll give them a call for you if you like!!??

Nick