3.9 RSR project --- my Carrera reborn

[911teo]

A couple of months ago I wrecked my 911 for a mix of stupidity and bad luck.

It was very sad because it took me a long time to get the car how I wanted it.... But I saw it as an opportunity to go a step fwd...

This is the car as it was (still is) after the crash...



So after fixing the bodywork we'll do the following upgrades:

- 935 front suspension erp kit
- 935 rear coil overs conversion
- Smart Racing Product front strut box + camber plate
- front and rear adj Fox shocks
- Fabcar dual master cylinder kit
- sunroof delete
- fuel racing cell

As the car will be in the shop for a while i decided to upgrade the engine a little too...
This is what is being done to it:

- 3.9L CMW P&C
- Bore case to 109mm
- new head gaskets
- ARP rod bolts
- solid rockers
- Valve job (regrind intake and exhaust seats)
- new valve guides
- CMW 52mm in valves
- CMW 43mm ex valves
- CMW Chromolly drilled retainers
- CNC port heads to 45mm
- Jenvey 51mm tapered to 45mm Individual Throttle Bodies
- Jenvey horns, fuel rail, linkage etc
- DC62 Dougherty Racing cams
- Motec M600 ECU


The idea was to have a fun, happy revving engine with a decent torque and a good throttle response...

The 3.9L capacity should provide for a nice torque base... and the ITBs, Motec and cams should make it fun above 5,000 rpm.
The goal is to get 400HP at the flywheel.
All the components have been ordered...

Will get pictures as they arrive and as the re-build progresses.

[DW SD]

Congratulations! That will be a SWEET package! Any current photos of the car?
Another fine example of...."every cloud has a silver lining"

Best regards,

Doug

[911teo]

So whilst the engine is being built (more details soon) the car is getting fixed.

The guys at Zuffenhaus dropped the engine and the transmission and now the frame is getting straighten.

I went to the body shop today and took some pictures... It is amazing what they can do...















The major damage was/is on the driver side rear suspension (the front suspension is all shot but I'll replace everything anyway).

Basically there is a disallignment of 1/2 of an inch... But it will be fixed. The flares will be fixed and a new panel for the light clusters housing and back will be welded to the rest...

All in all it looked really good

[Jgordon]

Very very glad to hear this. You really rolled with this one. We're looking forward to the finished product. Keep us in the loop with pics along the way!

[Tspringer]

If you are going to go with a 935 or ERP style front suspension, why are you also going to install the camber boxes and plates? The ERP front suspension allows you to gain all the negative camber you wish by adjusting the lower A arm, at the same time widening the track. This is a far better means of gaining the camber settings you want and it does not need the camber box or plates. You may want to reconsider doing both and perhaps save a few bucks.

[dwightp]

Matteo:

U twin plugging that motor?

I went with some CMW fabrication also. I do believe you will see those numbers at the flywheel.

I'm looking forward to hearing more as it progresses.

[DW SD]

Originally posted by dwightp
Matteo:

U twin plugging that motor?

I went with some CMW fabrication also. I do believe you will see those numbers at the flywheel.

I'm looking forward to hearing more as it progresses.

The base is a 993 motor, so it is twin plugged already, I believe.
I think he's adding MOTEC for control and Individual Throttle Bodies for more response and more overall power.

Doug

[911-32]

You should easily get that power. My old mechanic in New Zealand has built two engines similar to this for his own race cars. The first was an IROC replica with a modern 3.5 litre interpretation of a 2.7RS engine, ie., S cams, twin plug, MOTEC efi and ITBs with race exhaust. Made 350hp and was pretty quick in a straight line compared to everything running around in classic racing in NZ 10 years ago. ie., muscle cars, cobra replicas, Porsches, hot E-types. It made 350hp and went to my knowledge 5 years without rebuild and with lots of racing. I lost touch with the car when it was sold. His current race car is narrow bodied and has a 3.6 litre interpretation of the same engine. Predictably, it makes 360hp. You are using a better cam grind and have more displacement. Good luck with your very cool project.

[rdane]

NICE!! Rocket II, eh?

[911teo]

The core is indeed a 993... so it is twin plugged. As Doug said I decided not to use the Varioram and go for the individual throttle bodies and Motec to increase the throttle response.

Max HP was not the goal... The decision to go from 3.6 to 3.9 was made so that I could choose more aggressive cams and still have enough torque for it to be very driveable.

The cams are not as aggressive as the early S.

The specs for the ealry S cams are the following
Durations 0.40" I=268 E=240 with valve lift @.455"
Durations 0.50" I=265 E=265 with valve lift @.399"

The ones I went for have the following specs
Durations 0.40" I=254 E=236 with valve lift @.490"
Durations 0.40" I=247 E=230 with valve lift @ .455"

For comparison the 3.8 supercup had I=248 E=242 with same vlave lift (for 0.40") and the 3.8 RSR had I=280 and E=275 (same lift).


I really wanted to have a FUN engine. My 3.6 Varioram was powerful enough for the street. Most of the times I was either travelling at "losing license" speeds or at 2,500rpm....
I hope this engine will be more rev happy and I am really excited about the Throttle response... we'll see.

[911teo]

Originally posted by Tspringer
If you are going to go with a 935 or ERP style front suspension, why are you also going to install the camber boxes and plates? The ERP front suspension allows you to gain all the negative camber you wish by adjusting the lower A arm, at the same time widening the track. This is a far better means of gaining the camber settings you want and it does not need the camber box or plates. You may want to reconsider doing both and perhaps save a few bucks.

Jerry
I had trouble (rubbing on the inside) with the 275 tires when the car had T-bars. The coils will make it even more tricky and I was hoping the SRP towers and camber plates would give us more room (or flexibility) to play around with...

[mjshira]

any updates?

[911teo]

Actually the car is now at EUROWERKS.

I was going to get some pics tomorrow. The plan is to strip the interior, weld the sunroof, reinforce the front and rear shock towers and get the 935 suspension installed.

Then the car will go back to the body-shop to be painted.

On the engine front I decided to upgrade the rods (Carrillo) so now we are waiting for them to be delivered (they are already 1 week late).
The Jenvey stuff should ship next week. Assembly will be quick, then there is the dyno tune up.

Hoping to get done by the endo of February, second week of March.

[red964]

owch

I like those Fuchs

[911teo]

So after a long wait all the engine componets arrived...

Here are some picks taken by my engine builder Steve Timmins

[911teo]

some more

[911teo]

and more

[911teo]

please tell me if I should stop

[911teo]

The pistons...











...with the cams

[911teo]

Some more








The rods (Carrillo)