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R33 Boost Issues

BRADR33

By BRADR33,
in Engines & Forced Induction

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BRADR33 Apprentice

BRADR33

Posted
Posted (edited)

Hi everyone, recently I installed a turbosmart boost tee on my series 1 r33 skyline and have been having issues when I reach full boost. Before the boost tee, I installed a new larger fmic to replace the stock side mount. Due to the larger size of the new cooler the car was only running half of the standard 7psi boost it had with the side mount. I was told this is normal and installing a boost controller to wind the boost back up to 7psi would be the go. So I followed a thread from this forum to install the boost controller and everything seems to be installed correctly but when I come onto full boost (7psi) the car splutters repeatedly until I let off the throttle :/ I found that if I remove the boost tee and connect the standard boost solenoid back up the problem goes away. Although the car is now only running 3.5psi. If anyone has heard of this or has some idea as to what's going on and how to fix it let me know. Any help is highly appreciated. Thanks :)

Edited by BRADR33
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https://www.sau.com.au/forums/topic/452417-r33-boost-issues/
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GTSBoy Grand Master

GTSBoy

Posted
Posted

Your 3.5 psi is nothing to do with the larger size of the new cooler and everything to do with a massive boost leak that you have somehow managed to introduce, probably by not doing up an intercooler hose clamp properly.

It is also conceivable that you bumped/dislodged something else whilst installing the cooler.

Your poor old turbo is now spinning like a Mofo to try to make boost, regardless of the boost controller. Put the boost controller on and it is now spinning even harder. It's sucking lots and lots of air through the AFM, pissing it out into the breeze through the leak, and the ECU is calling a halt to proceedings when the AFM signal gets too high. It's called R&R.

I strongly suggest you take a long and close look at the pipework and do a lot of reading and research on the topics of R&R and the death of ceramic Skyline turbos when overboosted before proceeding.

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BRADR33 Apprentice

BRADR33

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  • Author
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Originally I thought the same when I first installed the new intercooler. I triple all my connections and the tightness of all the hose clamps but found no leaks. I took it to a mechanic to see if they could find the leak and they ran it on a vacuum tester. According to them there is no leak and the size of the cooler is why I'm not getting as much boost. They were the ones who suggested installing a boost controller to me.

GTSBoy Grand Master

GTSBoy

Posted
Posted

Well, it's simply not true. The "size of the cooler" has no impact on how much boost you make unless it is tiny tiny tiny and causing a massive pressure drop (like blowing through a small hole). As the situation is actually the opposite way around (a larger cooler should have less pressure drop), it would have to be a terribly poor quality core with massively bad design to cost you an extra 3.5 psi.

There is one other possible explanation. The time honoured "rag in the intercooler pipe" could do it to you.

Blackkers Experienced

Blackkers

Posted
Posted

This will end in tears if you don't address the boost issue. Listen to GTSboy.

1. remove the boost tap until you are 100% sure you're not overboosting.

2. pressure test the intake - very different to vac testing. However a minor leak is actually normal. the stock BOV has a hole in the side of it.

3. use an aftermarket boost gauge and don't go much over 10 psi if you value the life of your stock turbo.

4. Let us know how it goes

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  • 4 weeks later...
BRADR33 Apprentice

BRADR33

Posted
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Posted

Hey guys, sorry I took so long to get back to you but lack of funds kinda prevented me from doing so. Just recently I picked up a genuine autometer mechanical boost gauge of a mate for cheap and installed it into the car. I've tested both the stock and after market intercooler set ups and I am running the standard 7psi on both. So problem solved, no leaks, the standard boost gauge is just a lying piece of shit :) thanks for all the help guys ?

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

Hey guys, sorry I took so long to get back to you but lack of funds kinda prevented me from doing so. Just recently I picked up a genuine autometer mechanical boost gauge of a mate for cheap and installed it into the car. I've tested both the stock and after market intercooler set ups and I am running the standard 7psi on both. So problem solved, no leaks, the standard boost gauge is just a lying piece of shit :) thanks for all the help guys

Standard boost gauge isn't a lying piece of shit :) ... it reads in torr / mmHg, which many mistaken for psi.

7x100 mmHg = 1bar OR 14.5psi, so if you're seeing it at 3.5 x100 on your dash then happy days.

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