Project STi Time Attack

[AdamP]

Some maths for Scott

330 grams/sec equates to 19.8KG/min of Air coming into the engine.

At 11:1 this would equate to 1.81kg/min of fuel

Shell V-Power has a density of 754kg/m^3, or 0.754g/cc.... we have 740cc worth of fuel per injector and there are 4 injectors, so we can move 2960cc/min of fuel, which at 0.754g/cc is 2.232kg.

Assuming 330 grams/sec air coming through the injectors will run at approx 81% IDC

With normal fuel you end up with somewhere between 20 and 22 BHP for every kg/min of air that you move through the engine.

If we run at an AFR of 11:1 this would yield somewhere between 396BHP and 435.6BHP

I was thinking exactly that!







Seems to be coming along nicely!

Adam

[duncan]

I know - sorry slipped into techie mode then for a bit ... normal service will be resumed shortly :lol:

Left to do:

1) injectors
2) suspension set up
3) fit new tyres

10 days til Cadwell and 22 days left before knockhill.

[duncan]

The cause of the intermittent knocking has been identified and will be replaced tomorrow :thumb:

thanks to Gary and Chris for nailing this one, having spoken to a couple of other scooby owners, it is definitely the cambelt tensioner and gave them the exact same weird symptoms of intermittent nasty knocking from cold.

Zak and I will replace the cambelt at the same time for a kevlar belted one

[Stuart]

Coming along nicely Dunk. Good work :thumb:

[duncan]

I am very proud of myself today .... I just ....








changed the cambelt, cambelt tensioner and cam idler .... woohoo knocking has gone :thumb: ... yes you read that right. I the man that cant change the oil without pebbledashing a workshop floor, really did pretty much dismantle the front of my car and change these things with my own fair hands. I have all the cuts and grazes to prove it I did have expert supervision of course just to make sure I didnt do anything totally stupid more than once :lol:

It seems I was living on borrowed time for the past year with that knocking - it could have gone at any time and killed my engine On removal the idler was the cause of the main problem with visible as well as audible play in the roller bearing, the tensioner had a small amount of play too so that was replaced as a precautionary measure.

Things didnt go all smoothly as planned as when torquing one bolt up to 29lb/ft (not much) it just wouldnt tighten to that much but kept turning... thinking something was up I handed Zak the socket and then click and the bolt had sheared in the block

Luckily there was a bit sticking out and whilst zak and I were preparing to drill the stubby end out of the block, Luke stepped up and unscrewed it with his fingers :pmsl: - phew what a relief and top bloke :thumb:

Anyway, done now in just a few hours over what Subaru say it should take :lol:

Injectors will have to wait til next week now, but this is a massive relief and the difference in noise is superb ... it purrs now :love:

Thanks Gary @ APT for correctly saving me from that worry and potential very expensive problems. You really can walk on water sir :notworthy:

Also, nice to meet BeeSTi and Simon 57 down there - good chatting to you guys and hopefully you will share some of your tales on here and join us for some track action soon :thumb:

[Gerry H]

Sounds like a very gratifying week Dunk. Spent a few quid and saved a lot by the sounds of the state of that tensioner. Feel the force Luke :-D

[duncan]

A fun week I would say and most satisfying too in that immediate worry is removed

Now it is time to whack the boost UP UP UP !!!!! :devil: ..... 2 bar anyone :lol:

[Gerry H]

2 bar You only changed a cambelt tensioner or was it an uprated one :-D

[duncan]

only joking ... 2 bar is not possible.

We will be exploring the upper limits of the turbo capabilities though but depends on what boost can be held - probably just 1.5 bar to be honest but we will see

[BeeSTi]

Hi Duncan, sounds like you really enjoyed yourself today, Mr Mechanic.
I thought you had done that all before........

Maybe just the location that helped :-D


Car sound sweet as you drove of and that cold air bit of kit look very impressive, i spoke to Zak after you left and when Luke finished my car Zak plugged me in to the lap top for a few runs up the road..........



Just when I thought I could leave it alone :?


Nice to meet you Duncan

Darren (BeeSTi)