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The mkiv Supra Owners Club

Performance 'Problem'


Johnny176

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Thanks for the suggestions guys.

The TC has been off while testing. Yea fastcar its definitly someting to do with the boost controller. The only thing I could think was if there was some sort of 'high limit' and it was reaching it and cutting the boost. Im looking to get it up on the dyno ASAP and see whats going on.

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Thanks for the suggestions guys.

The TC has been off while testing. Yea fastcar its definitly someting to do with the boost controller. The only thing I could think was if there was some sort of 'high limit' and it was reaching it and cutting the boost. Im looking to get it up on the dyno ASAP and see whats going on.

 

Is it slower with the boost controller on? If not then there is still a major issue with your car as a stock TT would demolish a stock-ish CTR. Even a ham fisted driver with no launch skill would find themselves catapulting past once past 80mph.

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Again thanks for all the feedback guys. I went and checked all the pipes for any splits or loose connections but all seemed fine. I went back to checking the boost controller as it was the cause of the problem. I dropped the boost down to 0.9bar and tried again. Still it did this on off on off thing. After flicking through the manual (http://www.hksusa.com/content/pdf1642.pdf) which I should have done first lol theres a feature called offset mode on page 5 called which alters the boost curve. Not completly sure on that but the reccomended value is 100 for sequential setups - it was on 85.

Gave this a wee run and the problem was gone!! Sitting on the preset boost :-)

 

So I popped it back up to 1.2 bar and had another 'go' all seemed well and it feels noticably faster. All good in the hood :p

 

Was going down the motorway later at a steady 65 - 70 mph and there is a slight chugging, it's most noticable when gently increasing speed in 6th from 60 upwards. This is something that I dont feel lower down or when accelerating hard in a lower gear. I had a similar problem in a previous car which was easy sorted with a new set of plugs. I'm not sure how long the current set have been in for or even what type so I ordered a set of NGK BKR7E after reading Alex's post at http://www.mkivsupra.net/vbb/showthread.php?41927-FAQ-Spark-plugs. I'm hoping this sets me right :)

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