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The mkiv Supra Owners Club

Decat and Boost problems


AMG

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First off, i took the first cat off yesterday (no cats at all now) and cant believe the difference it makes. I did boost up really well and smooth.

 

Took it out today for a thrash, all was fine until i came to another biot of straaight road. Put my foot down, pulled reallt well up to about 4K, then no second turbo boost. I think the max reading on my gauge now is 0.3 Bar. Had a quick scan over the pipes but could'nt see anything a miss. Had a look through the previous post but my boost seems too low for a pipe problem.

 

There were no loud bangs etc, it has just decided to stop boosting. Any ideas anyone?

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It'll be the intercooler ducting has blown apart because of the increased boost pressure. Start by looking at the ducting down by the side of the battery. If that's where the problem is, whip the battery out to get at the problem area. If it's not there it'll most likely be where the ducting goes to the SMIC under the OS wing.

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Already checked the pipes, got a HKS FMIC and have been getting up to 1.25 Bar before Fuel Cut. Nothing has blown off yet. Restricted the boost to 1.2 bar now with the restrictor ring. I will have a closer look tomorrow. Is it most likely to be a pipe or are there other possiblities?

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