My life with Porsche… And my latest (last build) – 2.8 RSR style on 9111121235

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

OUTSIDE:

Walk around video

https://youtube.com/shorts/butgx8O0mKg?feature=share

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

More progress with the new side glass and re-anodized window frames going in…

We were having trouble finding green tinted rear quarter glass, so the originals were cleaned and pressed into temporary service…

And the sunroof was coming together… We were missing some parts, and sourcing had proved time consuming, but it all came together in the end… Almost everything that could be replaced with new Porsche parts was… The sunroof was a trouble spot, and in retrospect, probably should have been eliminated, but I just couldn’t bring myself to do it, and it is all working now… Though Joost continues to fine tune it… It is not quite as smooth as he would like it…

https://youtube.com/shorts/lAXKbAkHngc?feature=share

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

Junior, meet your great, great, great, great, great, grandfather…

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

More interior:

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

MOTOR:

The motor was entrusted to APP Racing Engines… TwinSpark / Differs work with them a lot, and APP have powered many race winning cars…

After we reviewed the brief, and a lot of back and forth spirited debate… Mainly with them keeping me to my own “north star”… It is so hard to make trade-offs, and inevitably, we will want to change something or wish we did something different…

We went with the following… If we decide to go racing, then I’m sure we will end up building a new motor…

3.0 RSR style engine – target would be to try and see 300+ HP and in the range of 310 NM / 230 Ft lbs torque – street drivability would be the main focus – “north star”

• Custom Capricorn pistons and cylinders (Porsche Performance Products | Capricorn)

• Carillo rods (https://www.cp-carrillo.com) – we debated using titanium rods, but in the end, as it is not a race only motor, demurred to steel…

• Ported and flowed heads

• Schrick parts for the valve train, valves, springs, retainers, etc., including new rocker shafts and rockers… all DLC coated… (https://schrick.com/en/)

• DC60 cams… We debated the DC65 vs DC60… If raced, we would need to change to sprint cams anyway, so went with the DC60

• High butterfly MFI throttle bodies – Lex (one of the principals at Differs) races a 3.0 RSR FIA spec car in historic racing… He has run both high butterfly and slide valve throttle bodies, and recommended the high butterfly as being more drivable for our intended application… His feeling was the slide valve, while it looks cool, behaves almost like an “on / off” switch, and isn’t really drivable at lower revs, as well as needing a bit more maintenance, as they can sometimes be sticky…

• Stock style air cleaner to match high butterfly velocity stacks

• MFI hard lines – we debated the “soft” flexible hoses, but ruled them out for road use

• Twinplug system from raceservice4u – twinplug distributor, 8 pin CDI boxes with rev limiter built in, their own made twin black coils (Home)

• GT3 oil pump for extra scavenging, and the cost is about the same as a 930 pump

• 993 crankcase oil filter console (993.107.057.01) in place of the engine mounted oil cooler – we keep going back and forth on this one, and it may change back to an oil cooler… the theory is if something goes “bang” in the motor, then the shrapnel doesn’t go into the oil lines and front cooler, necessitating replacement, cleaning, etc… Good for racing, and saving time / money if it happens, but we need to see if the front cooler can keep the engine cool in normal road circumstances… “north star”… Probably not an issue in northern EU and the UK, but potential trouble if ever caught in a southern EU summer traffic jam…

One thing we wanted to keep was the ability to have heat and defrost capabilities… This would prove to be one of the biggest challenges with the build… There are a lot of promising potential possibilities…

• SSI 41mm heat exchangers
• Eisenmann 42mm heat exchangers
• Bursch headers with heat
• Cargraphic headers with heat
• Various custom setups – E.g. MK, etc…

Because of the C-19 lockdown and the supply chain issues that was causing, we were getting varying stories on timing for availability and delivery… In the end we decided to go with Eisenmann, as they seemed to be the company with existing stock… That turned out to not be the case, and we waited over 6 months for the exhaust to finally be delivered…

We went ahead and built the engine with a spare set of Friedrich Motorsport headers that Differs had to keep the build going, and get the motor rough dialled in and setup on APPs in house engine dyno, then we would try a few different exhaust systems when it came time to rolling road dyno tuning and shakedown…

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

DYNO DAY!

The engine was almost together and was going to be run in on the dyno… So, I booked a flight to the Netherlands to see it run for the first time… But, it wasn’t quite ready…

So, I managed to take a few photos, and would have to get a video from the guys later… One of the few let downs of building Schtroumpf in the Netherlands away from home…

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

More photos...

[haul]

what a nice unit

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

BACK AT DIFFERS:

After the visit to APP to see the engine, we went back to Differs had a couple of coffees and good chat, and I took a few shots of Schtroumpf and her stablemates…

A few longhoods, 964s, a 911R… A new 935… A Countach, a few early Alfas, various others…

And of course the 964 C4 Leichtbau…

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

the birdcage:

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

FRONT & BACK GLASS:

A few days later, the front and back glass went in…

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

1^st SHOWER:

Then Schtrumpf got her first proper wash… Looking sharp… looking for love…

[flatsixer aka rstarga Find all posts View Profile Close flatsixer]

That is a proper motor, good choices on the high butterfly instead of slide valve, they do tend to stick at the most unfortunate times. I've never been a fan of the flex fuel lines for safety reasons.
I had a modded 81 turbo with an RSR front cooler in a DP front spoiler and never had overheating issues in Texas.

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

That is a proper motor, good choices on the high butterfly instead of slide valve, they do tend to stick at the most unfortunate times. I've never been a fan of the flex fuel lines for safety reasons.
I had a modded 81 turbo with an RSR front cooler in a DP front spoiler and never had overheating issues in Texas.

Thanks for the kind words, and your thoughts and experience... For a race car, I get slide valves and flex lines... a race car is being inspected, torn down and rebuilt after every race... I'll definitely being paying a lot of attention to Schtroumpf, but not to the detail a race car gets looked at... I think we should be OK with just the front oil cooler, but if not, we can address that...

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

Dead Pedal:

We had forgot to put it in, so in it went… Need a little retrim of the carpet…

[dwa911 Hasta la vista... Baby Find all posts View Profile Close dwa911]

A few new parts showed up!