1) I'm considering upgrading to GT-spec rear calipers and wondering if anyone has encountered clearance issues with dust shields, etc. after installing the vented rear rotors? Apparently, track cars were more concerned about cooling than keeping debris out, so dust shield were typically omitted. However, this is a road car, so I want to keep the rocks out. I've heard tell of a "Rally GT" brake system which presumably uses the dust shields, but don't know what any differences might be.
2) The GTs used a reinforced engine mount due to concerns about the increased power and stresses of racing. Although this isn't a track car, I'm running a 2.7L with modified "S" cams, so wondering if I shouldn't also add some strengthening to the stock engine mount. Are the strengthening gussets available as parts, or do these have to be fabricated for welding to the stock mount? Embedded is a pic of the mod I'm referring to. Does anyone know what they did for the 916s?
TIA,
- MR
On the first question, I took off the dust shields long ago. I do street, autocross, and track events and I've never had a problem.
Second question, my 3.2 uses McMark's replica of the original factory six mount (for authenticity). I have no problems. Patrick Motorsports told me I'd have shifting problems from the torque of the engine twisting the shift apparatus. Nada... Mark's mount is quite nice and more people should be looking at it...
I've got the GT calipers 914 Rubber put together with PMB's help. With the vented rotors, I was still able to get the shields to fit. Honestly, it's very tight but doable.
For the engine mount, I've got a factory style one made by MB911. Mines got the reinforcement I believe. I'm running a 200+ hp 2.7 in the car.
Double post....pls delete.
Pictures of mod to 914-6 #41 by Eric @ PMB.
The bracket above held the car as Jig during painting
Bob B
Thanks guys for all of the feedback. Truly appreciated. I decided to go with the dust shields and forego the engine mount reinforcement, since I hate to risk damaging and having to redo the fresh paint on the passenger side of the firewall. I know, it can be fixed, but I'd have to fab the reinforcements, then weld, then repaint. Not worth it at this point for my application, IMO. Hoping I won't regret down the road.
- MR
My experience, yours may vary.
Only #1
When I added the v -kit to my rear calipers to use the vented rear rotors, the addition of the spacer in the middle of the caliper offset the center of the rotor to the inside.
A shim was needed to center the rotor between the brake pads. I used the dust shield bracket as a shim, I rotated it 180* so the offset pointed out instead of in.
When I attached the shield it had an additional inch opening at the front to scoop more cool air into the rotor.
See my signature photo.
<-----
working without issue 8 years.
again your milage may vary!
I did the GT mount update on mine and deleted the shields with GT rear calipers.
No Regrets!!!
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