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Boost Signal

sIIgtst

By sIIgtst,
in Engines & Forced Induction

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sIIgtst Rising Star

sIIgtst

Posted
Posted

Hi all i have a front mount intercooler on my r33.

it runs the cold side over the radiator fan to meet up with the standard cross over pipe.

currently my boost conroller takes its signal off a line running from plenum to charcoal canister, its just t'd into it.

I want to get a nipple welded into the cooler pipe to tidy everything up abit and i think my slight spike issue is related to it running the way it is.

my question is where should i run the nipple up near where the cooler pipe meets the crossover pipe or closer to the turbo outlet on the way to the cooler?

I heard running after the cooler is better due to pressure drop across the core but am unsure can anyone confirm this?

all advice welcome but real world knowledge would be best..

Cheers,

Corey

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StealthX Veteran

StealthX

Posted
Posted (edited)

my source is off a nipple, right in front of the throttle body, that way, regardless of intercooler pressure drop and any small leaks on hot side, 7psi of boost must pressurise that line for the wastegate to open. sometimes this means that the turbo might actually be boosting 1-2 psi more in order for 7 (or your set boost level) to reach the signal line.

in regards to your spike, make sure the signal line is perfectly sealed... other than that, spikes are a bit of a mystery - they could be a million things.

best bet, get a computer with a boost cut out. with my EMS stinger, if i spike more than 9psi (boost is set at 7psi), it just cuts the spark and injection, safe as houses. Just had a thought, cos your running the signal line off the carbon canister, there's your problem, cos the boost has to fill up that entire line before the wastegate gets the boost signal required. wastegate lines need to be as short as possible, and directly from the cooler piping with nothing T'd into them.

good luck buddy

Edited by turbo x-trail
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