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hey guys i got the car tuned today but on the dyno graph the psi is droping from 14psi to 11psi is this normal i got a gizzmo boost controller and the setting is on 56 duty cycle and the gain is 0 would it be my wastegate and also its a highflow gcg turbo

post-12005-1177314109.jpg

Edited by Jsikalias
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hey guys i got the car tuned today but on the dyno graph the psi is droping from 14psi to 11psi is this normal i got a gizzmo boost controller and the setting is on 56 duty cycle and the gain is 0 would it be my wastegate and also its a highflow gcg turbo

What boost controler you using because it sounds like its spiking then going back to stock boost

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From what I've seen of those controllers they are quite shit!! If an EBC has no PI or PID based boost control then you may as well just use a bleed valve. From memory you set the boost from a base duty cycle not an actual desired boost pressure so there is probably no brains behind it anyway.

You could try setting the gain to a higher value but it probably wont work anyway. If it is possible which I dont think it is you could check the duty cycle on the valve to see if its attempting to control the boost. As has allready been said it may be a mechanical restriction.

Edited by rob82
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I had a similar problem and discovered the wastegate arm was hitting the bracket that holds the heat cover because the new dump had a thinner flange.This prevented the wastegate from opening fully and capping boost to 15psi.Anthing over and boost would spike all over the place.However,the duty cycle could be lowered then turn up gain til it spikes then back off a little.

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its the gizzmo boost controller,

they are known to spike. i have 2 mates that have had em in their cars and the cun*ts spiked like crazy.

my suggection, get rid of the gizzmo and buy and apexi or similar

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yeh the tuner said it could be my wastegate BUT i found the problem, because i have an aftermarket intercooler the new piping didnt give me a nipple for the powersteering vacum so i T pieced it off the boost controller vacum so iv removed the T piece and now it doesnt drop boost it holds 14-15 nice feels faster as well

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go to like super cheap or repco and buy an air compressor fitting. they thread and can easily be drilled and screwed into the cooler pipe. plus add some sealant around it and ur done.

should look like this hen done

post-31466-1177399916.jpg

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