912/6 Project - here we go again!

[anglophone1]

Keith Fantastic!
Look forward to seeing "El Chuco" at the GRRC member's meeting next year?
Best
C

[miles5]

Great story of perseverance in the name of love/Porsche.

Congratulations!

[willbrown]

Lovely story Keith. Car is stunning. Reminds me a little of Andy's old silver R. I hope it's not as LOUD!!

[Lightweight_911]

[KS]

No, I'm much more refined. It's very subdued, so subdued that I'm not even sure it's running... Yeah, right.

I am tempted to get Turbo Thomas to make me some megaphones, just to annoy the locals.

[Mitch]

Great first outing story KS, beautifully crafted.... like the car!



Just need to sort out that badge engineering now...

[KS]

Cheers Mitch! I'll drill the holes ready for the new badges tomorrow...

Today I raised the seats by 20mm using hardwood blocks (!) as a temporary 'let's see if it works' modification. And it does. Driving position feels so much better! Now to get some aluminium spacers made up...

First, tomorrow we're off up to the RHS gardens at Rosemoor – about 12 years ago, I said to Sarah that would be great road in a Porsche, all ups and downs and sweeping bends. I'll let ya know...

[KS]

https://www.facebook.com/keith.seume/vi ... 803619768/

205bhp at 6430rpm
168ft.lb torque at 6230rpm (interesting!).

[Gary71]

Nicely done. What was the engine spec again? I'm too lazy to scroll back 26 pages and find out!

[Darren65]

Fantastic and very impressive!

Awesome result Keith, well done.

[impmad2000]

fantastic. Bet you're smiling now ! The numbers are one thing, but what is it like to drive ? And how intoxicating is the roar at 6k rpm ??

[KS]

fantastic. Bet you're smiling now ! The numbers are one thing, but what is it like to drive ? And how intoxicating is the roar at 6k rpm ??

Me? Smile? A grin, maybe.
There is a misfire somewhere along the line. The engine wouldn't pull over 4200rpm so after some deliberation we changed the coil pack and the EDIS-6. Better. Then Stephen Miles questioned the wiring of the crank sensor, which I assured him was correct. He suggested changing the settings from 'rising edge' to 'falling edge' and bingo! Clean revving all the way to 7000rpm! Hmmm, not quite sure what's going on there as it's way beyond my scope of knowledge, but it changed everything. The map in the ECU had allowed max advance of 45 degrees, so that's now back to 32-35 degrees. No more pinking even under load at WOT at 1500rpm.
But there is a problem which manifested itself on the way home in that after miles of cruising at 3800rpm (roughly 80mph, m'lord), when lifting off the throttle slightly, the engine would stumble big time, the tacho would plummet, and then pick up again. If I got straight back on the throttle, no problem.
As there's also a slight hesitation every now and then, which didn't show up on the fuel or ignition maps, I'm wondering if there is a wiring-related (maybe earth?) problem - or poor shielding of the VR wiring allowing spurious signals to abound. Any thoughts?
But I can't argue with 205bhp. Bob Watson estimated 190-200bhp, so he was right on the money. It produced 142ft.lbs of torque at 3000rpm, which dipped to 124ft.lbs at 4200rpm before climbing relentlessly. The map has totally overridden the 'torque less wonder' characteristic of the 'S' cams, which is just what I wanted.
Out on the road, the car feels fast (probably not by modern standards) with a shattering induction roar as it comes on cam at 4200rpm. The first time I experienced taking it to the redline, I winced as the noise was so different, so sharp-edged – so loud!
Other good news is that the tacho now works for the first time ever – I was given one of Bob Ashcroft's 'Tach-Adapt' boxes while out in the USA and it worked treat. And thanks to a pre-rolling road service by Williams-Crawford, I also have a working speedo once again. Just the clock to go...
So there we are for the moment. I'll probably leave it alone for a while and concentrate on work, which has been somewhat neglected of late. I have a 'to do' list which has now grown a little, but all in good time...
Thanks for the support DDK – you're the best.

[KS]

Nicely done. What was the engine spec again? I'm too lazy to scroll back 26 pages and find out!

2.2E with +1.0mm Wossner forged 10.0:1 pistons, ARP fasteners, WebCam 'S' cams, Jenvey throttle bodies, Megasquirt 2 ECU, Turbo Thomas stainless headers and R-style muffler, Patrick Motorsport 7lb flywheel etc. Built by Bob Watson.

[Bootsy]

[impmad2000]

There is a setting that does "decel cut" that can give an aggressive stumble on power- off . Might be worth finding this and at 1st, turn it off, if that cures it, re-adjust the parameters at which it cuts in/ out.
Whatever, drive it whilst the weather is mild ! You've got some catching up to do to make up for missed miles