TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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the reason why this is happening is because with Poly mounts the engine sits higher. a lot of people have had this problem...hate to tell you this but Im pretty sure most people end up ditching the poly and going with quality GM motor mounts. Good Luck!
Originally posted by 91RS5speed Im going to do the shims were is the best place to get metal like that?.
Try any hardware store or a big box one like HOME DEPOT. Any flat stock 1/8" should work. With the small thickness you can check to see how much you will need for clearance over the TPI. Just remenber you also have the hood clearance.
I read that using Poly mounts can give the knock sensor false vibrations from the chassis and cause the timing to retard. Mainly using them on the transmission mounts. Anybody else hear about that?
The further away from stock you go the bigger the PITA a STB becomes.
My motor sits on poly mounts with a Superram intake. My Hotchkis STB is bolted all the way forward on the strut towers for max clearance. While the STB cleared the motor I had to pull the hood insulation and cut out the middle support so the STB would clear the hood.
