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post #1 of 4 (permalink) Old 08-21-05, 09:15 PM Thread Starter
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Boost Issues?


I have an XE Falcon running an XF 250 crossflow motor. It is set up with a larger turbo and external wastegate. Its run by an EMS computer. The problem im having is that the boost doesnt come on all the time and if it does come on, it gets to about 5-6psi at about 3000rpm and just drops out suddenly. Im not sure on the specifics of the gear as the guy I bought it off didnt really know himself. Another issue is that when normally accelerated, you have to keep pushing further on the accelerator for the car to gain speed. Its hard to explain, basically the only way to get it going harder is to completely put the accelerator to the ground. Each little increment you push the accelerator down before that, it loses power. You can sometimes hear the boost escape when it reaches that 5-6psi point. Ive checked the vacuum lines, took off the blowoff valve and sealed it, im thinking its the wastegate? is there anyone with an idea of what may be happening?

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post #2 of 4 (permalink) Old 08-22-05, 09:42 AM
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Re: Boost Issues?

No idea about the last one, but i hada recent problem similar to yours. Car wouldnt rev above 3000 when under boost, would just hold revs no matter the throttle position. Turned out to be the induction hose from airbox to turbo was getting sucked in under boost.
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post #3 of 4 (permalink) Old 08-26-05, 02:34 PM
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Re: Boost Issues?

a bit off track check ur tps
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post #4 of 4 (permalink) Old 08-27-05, 08:32 AM
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Re: Boost Issues?

Check that connections on boost side are not comeing apart...
This can happen if turbo is too big also..
Check turbo flow chart..Check that you are above surge line...

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