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Problems After Gtrs Turbo Install

green 33

By green 33,
in Engines & Forced Induction

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green 33 Explorer

green 33

Posted
Posted

After installing a hks GTRS turbo it now Feels like i am driving with handbrake on, and its low on power, it is slow through the revs no coughing or missfiring though, is the GTRS a laggy turbo the main reason i purchased it was because it has good hype for responsiveness. with standard turbo would have no dramas spinning wheels in take off and even into second now i cant even get them to chirp

I have an SAFC so shouldnt that rule out R&R??

When you upgrade to the GTRS was i meant to change injectors or Fuel reg??

Could it be fuel pump is not getting max volts??

supporting mods are

Bosch 040 fuel pump

FMIC

Blitz BOV

K&N pod filter

Splitfire ign coils

SAFC

3" turbo back exhaust with hi-flo cat

gizmo boost controller

Excedy HD clutch

Please any help would be great, after spending so much on turbo kit it is really ticking me off

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johnbarry88 Grand Master

johnbarry88

Posted
Posted

it will need a tune and injectors and afm for you to see any kind of bennifit, remove the safc and get a tunable computer you have stepped up a knotch now and safc just wont do the job properly.

stolen_s15 Mentor

stolen_s15

Posted
Posted

Check then double check all connections and gaskets you replaced.

Make sure you have done up all hoses/clamps and make sure all vaccum lines are on. Is the AFM plugged in?

I'm sure it will be something small and simple.

Good luck.

green 33 Explorer

green 33

Posted
  • Author
Posted
Check then double check all connections and gaskets you replaced.

Make sure you have done up all hoses/clamps and make sure all vaccum lines are on. Is the AFM plugged in?

I'm sure it will be something small and simple.

Good luck.

had loud whistle with new turbo so i have double checked and triple checked all gaskets and lines def no leaks, AFM is plugged in but i guess giving it a clean wouldnt hurt. didnt unplug any electrical connectors but will check nothing has come loose.

thanks

it will need a tune and injectors and afm for you to see any kind of bennifit, remove the safc and get a tunable computer you have stepped up a knotch now and safc just wont do the job properly.

They are selling these turbo's as direct replacements to standard unit, would have been good for a bit of fore warning to know i was goig to need management, larger afm and injectors.

my big problem is i would be happy if it was going as hard as before new turbo, but it is just so sluggish now

R33GOD Grand Master

R33GOD

Posted
Posted (edited)

mate its normal. the car needs to be tuned.

when my hiflow first went in the car would take ages to boost and just felt crap.

another thing...... have you set up your ACTUATOR properly?????

bend it a little :)

(if you got the stock actuator ofcourse)

Edited by R33GOD
Blitz Grand Master

Blitz

Posted
Posted

All those mods, and no fully programmable ECU - There is the problem.

Get a Power FC, and tune it

The GT-RS is an awesome upgrade for an RB25, and yes it technically is a direct replacement for the stock turbo, but common sense should tell you that when you replace a stock turbo with one thats rated at 420PS, you are going to need a suitable ECU to run the show, and the required supporting mods.

green 33 Explorer

green 33

Posted
  • Author
Posted
mate its normal. the car needs to be tuned.

when my hiflow first went in the car would take ages to boost and just felt crap.

another thing...... have you set up your ACTUATOR properly?????

bend it a little :)

(if you got the stock actuator ofcourse)

Bought Full HKS Kit came with actuator the lot,

green 33 Explorer

green 33

Posted
  • Author
Posted
just tighten it so it builds boost quicker.

i got one on my car. been ages since i stuffed around with it

It actually builds boost quickly but just runs like crap, i had a fuel pump fail on me and it felt like that, like there is just not enough fuel there, and when adjusting SAFC it is not making any difference

discopotato03 Grand Master

discopotato03

Posted
Posted

The std RB25 turbo is a bit restrictive on the exhaust side so going to a GT28 BB based turbo will open it up some .

I'd imagine the std computer is not giving it enough innitial light load ignition advance and thats making it feel a bit flat .

To have full control of fueling and ignition timimg you really need a programmable computer eg a PFC to take advantage of that turbos capabilities . I think exhaust/computer first is the best upgrade path because you can make the most of your engines spec at each stage .

Cheers A .

  • 1 month later...
green 33 Explorer

green 33

Posted
  • Author
Posted

Thought i had better update how i went with this problem incase anyone else runs into this drama,

Fitted a malpassi reg and seemed to fix the problem, but then it would intermittantly run like crap, so i put a fuel pressure gauge on and found it would vary pressure from drive to drive, I had mounted the malpassi on the side of the intake manifold and it was getting too hot, and when it would get hot the fuel pressure would fluctuate +/- 15%,

So i replaced it with a sard unit mounted it near the fuse box, new tune on the safc and hey presto car runs like a dream.

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