Gtr Hks 2530's Problem

[kng-180]

hey fellas

just got my gtr back the other week and im having dramas

iv replaced the standard turbos with 2530s and what the car is doing is when crusing in some times 4th but mainly 5th gear at 3000rpm u start to put ur foot down to acelerate to keep up with trafic as the boost starts to rise and engin revs reach 3000rpm the turbos start surging like fighting each other pushing air back and forth in to the air flow meters cauing it to dump a shit load of fuel u can put ur foot flat to the floor and it keeps on doing it the car doesnt go any where and this problem only occurs when crusing but under full throttle in lower gears its fine car produces 275 rwk i have other mods which include

power fc

sard 700cc inj

air filter piping kit

hks filters

hks pump

greddy inlet plenum

plazmaman cooler

hks cam gears ( still set to 0 deg)

standard afm's

hks reg

tommie fuel rail

hks dumps

hks exaust

5 inch cat

sard single bov

car is running 14 psi boost

if any one knows of this problem or has incountered it before your help would be greatly appreciated

regards

anthony

[paulr33]

its known as compressor chuffing or shuffling

do a search on it, its been covered before

the custom air filter piping kit is the likely cause of the issue

also the stock bovs will be much better than the single sard, throw that in the bin.

try with the stock bovs connected and see if the problem still occurs

[paulr33]

a quick elmination would be to take off the pods and piping kit for the pods and just drive around the block with the airflow meters opened mouthed. see if it occurs, if it does, then its the removal of stock bovs.

if the problem goes away its likely the pods / piping kit may be the gremlin

[Swiper the Fox]

No need to panic, it can be tuned out to run like a dream. Mine did the same until Croydon Racing took over the tuning of the car. Powering up hills on light throttle is no longer a problem.

[paulr33]

what did they do exactly? on the certain load points where it wold surge, was it a timing or inj change?

[Swiper the Fox]

what did they do exactly? on the certain load points where it wold surge, was it a timing or inj change?

Can't give you a definate answer on that one, suffice to say the car was a little frustrating to drive beforehand and smooth as factory after. Give Croydon's a call and chat to Jim about it, as im sure he could explain what he did to the tune to overcome it.

[T04GTR]

you need to make the piping the same length from each turbo to the airflow meters.

but thats abit tricky.

also having a balance pipe joining the two intakes together helps aswell.

and yes no bov woks as quickly as the stockers . there sweet

[Swiper the Fox]

you need to make the piping the same length from each turbo to the airflow meters.

but thats abit tricky.

also having a balance pipe joining the two intakes together helps aswell.

and yes no bov woks as quickly as the stockers . there sweet

Yes we have a balance pipe between the two intakes but it was there all the time, the two intakes are of different length. He almost tuned the shuffle out of the GT-RS turbo's now fitted and is confident of having it sorted once we put the balance pipe between the two exhaust manifolds.

[kng-180]

cool thanks all for the replies it is fustrating to drive at the moment so i will have to sort it out

[T04GTR]

hmm. interesting. that does make alot of sence dirt..

come to think of it. mine did it stock with just a good front pipe and no cat :

[blk180]

Yes we have a balance pipe between the two intakes but it was there all the time, the two intakes are of different length. He almost tuned the shuffle out of the GT-RS turbo's now fitted and is confident of having it sorted once we put the balance pipe between the two exhaust manifolds.

So your adding the balance pipe now. Will be good to see the Diff

[Gav]

So your adding the balance pipe now. Will be good to see the Diff

I swapped out a std set of HKS terb manifolds with the balance pipe style on mt GT-RS units and it made a huge reduction to shuffle.

[kng-180]

shit man this is starting to sound like a big job to fix maybe i might just go a single turbz might be a less stressful way to solv the problem