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Free Horsepower For Gtst & Gtr's

SIKR33

By SIKR33,
in Engines & Forced Induction

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SIKR33 Contributor

SIKR33

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good one numbnuts u wasted money phoning japan ur a PLATINUM DICKHEAD then arent you! do whAT Ever you want if you don't like what i write DONT read it !

at least i can wave my dick around and it aint stuck up my arse>

seriously u ahole im helping people here go and hassle sum1else

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Jay95R33 Grand Master

Jay95R33

Posted
Posted

Guys - time for a group hug

:grouphug:

OK, the attached pic is the pipework and solinoid off of my series 1 R33 GTS-t.

See the hose on the left how it has a red band around it. Well that indicates where the restricot is in the pipe.

Have a look.

J

Revhead Grand Master

Revhead

Posted
Posted

Can someone explain to me how adding a restrictor to the wastegate line can *limit* boost rather than raise it (or at least postpone it)? This is a serious question - as I understand it, placing any restrictor in the wastegate line will slow the response of the wastgate actuator in relation to the manifold pressure. Obviously if some well-respected people like Mark Tillbrook are saying that doing nothing except removing the restrictor will give you more power, then there must be some truth to it. Can anyone clear it up with a solid explanation?

JAGR33 - sounds like your car is a bit of a weapon :P Not disputing your claim of a power/boost increase, but I would suggest that much of this increase came from the cam gears. It's amazing what effect dialling in the cams has on not just the running of the engine, but also the building of boost due to different valve openings. Also, if the exhaust and pod were put on at the same time then they would also have a sizeable impact on boost. At a guess, the reason so many people recommend removal of the restrictor is because it makes it difficult for an aftermarket boost controller to have "full" control over the wastegate - a case of too many cooks, if you will. On a stock engine (or at least one with the factory wastgate system in place) I would leave it in, or risk losing boost response. Again, correct me if I'm wrong and you can back it up with a solid explanation of why.

I'm not going to dispute the presence - or lack thereof - of a restrictor on a non-GTR because I just don't know, suffice to say that if your car has ever been in need of a wastegate line replacement, I dare say it was replaced with standard vacuum hose, without a restrictor, as it'd be cheaper and easier to get hold of than the genuine Nissan item.

Black33 Proficient

Black33

Posted
Posted

The restrictor is there to limit the volume of air going to the bleed valve (or factory solenoid) to ensure that boost is controlled better.

Many tuners (even ICE) use restrictors in the line going to a bleed valve to limit the volume of air the bleed has to "bleed off" so that spikes can be reduced.

ADAM SERIOUSLY IF I WANT TO USE CAPS LOCK I WILL OTHERWISE MIND UR OWN BUSINESS, AND YES I AM AN AIRCRAFT MECHANIC AND THIS IS A RESTRICTOR AND NO IT WONT CAUSE THE TURBO TO OVERBOOST ALL IT DOES IS FREE UP THE VACUUM LINE TO ALLOW MORE BOOST TO BE APPLIED BUT IT WILL ONLY BOOST TO 7.5PSI WITHOUT AN EXHAUST OR WITH AN EXHAUST 10 PSI . GUYS DON'T WORRY THIS WILL NOT HARM UR TURBO OR MOTOR. ITS BETTER THAN CUTTING WIRE 53

I don't understand how "freeing up" the vacuum line will allow more boost to build up? :confused:

By this logic, more pressure in this line will mean the wastegate shuts earlier = less boost

Also, it is normal for a std car to boost to 7.5psi and then to 10psi with an exhaust with no other changes.

JAGR33 Grand Master

JAGR33

Posted
Posted

Revhead, I see what you are getting at, but from what I've experienced in the last week, tells me that there is a difference with taking out the restrictor.

Just to clarify, my full exhaust and pod filters were installed months ago, therefore they wouldn't have increased the power from 185rwks to 215rwkws. Once I took the restrictor out, the dyno showed 200rwkws (boosting to 13.5 psi, but holding 12.7psi). Therefore an increase of 15 rwkws. Another 15rwkws were extracted from dialing in the cams.

Also my mate took out his restrictor in his R32 GTR and reckons the car boosts much harder, and an increasing in performance. We're not talking 'mind blowing' difference, but its definetly there.

As far as technical explanation goes, I can't help you there but I definetly experienced a difference....

Hope that clears things up.

Ronin 09 Grand Master

Ronin 09

Posted
Posted

All this talk of removing on a 33... are we sure we WANT 13-14psi on the stock turbo? I've read so much about stockers only holding safely around that figure, why would you want to remove the alleged restrictor?

Guest 570CK

Guest 570CK

Posted
Posted
Originally posted by Ronin 09

All this talk of removing on a 33... are we sure we WANT 13-14psi on the stock turbo? I've read so much about stockers only holding safely around that figure, why would you want to remove the alleged restrictor?

Buy a bigger turbo then :(

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