The GTM Supercar Build Log

Exhaust Mounted, Idle Tuning Complete?!?

Finally got around to mounting the exhaust last night. Josh fabbed up an exhaust mount to replace the Kooks ugly (to me) mounts that wrap around the nice polished mufflers. The Kooks mounts mount to the trans (you make the brackets) to avoid flexing the exhaust against the stationary frame. Josh’s mount does mount to the frame, but it uses a rubber ‘bumper’ so that it can flex under revs, etc. ¬†Works very nicely as I can see the exhaust moving with the motor as it idles, etc. The mount is out of the way and not very conspicuous.

With the exhaust mounted the rear mesh was set in place (with the cutouts made for the tips, previously). The mesh was slipped over the exhaust before it was mounted. After some fine tuning of the cutouts weatherstripping was applied around the cut edges. This creates a nice finished look. I will have to remove the diffuser to glue/silicone the mesh in place.

With the exhaust on I set to tuning again. The motor still dies after revs out of idle with the exhaust – I was hoping it would magically fix itself with the exhaust in place. Today I was blessed with an easy tuning session, however. I added 5g/sec of air across the entire base airflow table and it started up and idled great and took some flogging of the throttle without any problems. Revs, drops to idle flawlessly. It would seem that the garage tuning is done for now. Once I get the car inspected (the 20th!) I will be able to get it on the road and see what needs to be done (if anything) in regards to driveability.

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