Boost droping at high RPM, greddy
some specs,
1990 1.6 new act hd clutch greddy kit running an fmu with the following additons and upgrades turbo clocked down FMIC and 2.5in piping Ebay purple BOV recirculated to intake ball&spring manual boost controler Boost set to about 6-7psi No ac or power steering Car will reach full boost with out a problem at about 4k( stock exhaust:mad:) as i start to go over 5k the psi steadily drops. will drop to 2psi sometimes less sometimes more. what are some ways to diagonosis this problem, its a real burden as this is the autox car and boos starts to fade right when it motor starts to make power. |
search "helper spring" or greddy wastegate their know to suck and need a helper spring to hold boost to redline
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ive seen this on mycar when the compressor was leaking.
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Originally Posted by turbobluemiata
(Post 312881)
search "helper spring" or greddy wastegate their know to suck and need a helper spring to hold boost to redline
magna where was your compressor leaking at? |
Check for a boost leak. Or a non closing bov... It can appear to be sealed and leak on pressure. Check all ic conections.
A stock greddy set should be able to make 6 psi with oem exhaust all the way to redline. |
Remove the rubber hose connecting the wastegate can to the compressor. Block the compressor outlet with a plug. Install a nipple in the pipe between the intercooler and the throttle body, and run a new hose from this nipple to the WG can.
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the ebay bov;s leak,, buy a real one
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you have a manual boost controller? tried running without the MBC fitted?
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Originally Posted by urgaynknowit
(Post 313335)
the ebay bov;s leak,, buy a real one
All BOVs purchased from any eBay vendor are completely reliable and trouble-free. I base this upon my experience of having purchased one BOV from one vendor, said BOV now being two years old and still working perfectly. |
could this just be the common case of the greddy wg
(helper spring) |
Originally Posted by Joe Perez
(Post 313258)
Remove the rubber hose connecting the wastegate can to the compressor. Block the compressor outlet with a plug. Install a nipple in the pipe between the intercooler and the throttle body, and run a new hose from this nipple to the WG can.
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