VF22 cant reach to 20psi/laggy

[subaroo]

hey guys use to run a vf28 spool very quick full boost comes around 3.5k-3.8k

recently did some upgrades, split fuel rails, vf22 and 38mm turbosmart wastegate 12 or 14 psi spring cant remember(unplum)

currently running hks evc boost controller, when i set the boost controller to 14 psi full boost comes on slow about 4.5krpm and the wastegate opens and sounds nice and sharp but if i crank it on to 20psi the turbo seems to struggle to reach to 20psi only can reach upto 16-17psi, wastegate doesnt open until 6-7krpm and once it opens sounds bad like hissing and not smooth

have supporting mods, front mount, semi tune headers, 3" downpipe to exhaust, silicone intake duct and a perfect power smt8-t piggyback ecu.

"http://www.rx7club.com/attachments/3rd-generation-specific-1993-2002-16/445255d1319116335-electronic-boost-controller-comparison-chart-ewg_ebc.jpg"

dont know why the turbo so laggy and cant run 20psi

please help cheers.

[lachlan]

What is the ecu tuned for ?

Did u actually just slap a bigger turbo and add 50 %more boost and think itd be ok ?

[subaroo]

Tuned to vf28 internal wastegate. 21psi high boost. It ran smooth no spike etc.. Until it didn't hold boost and found out my inlet fin chip Abit.

[Johnnynz]

Rooted turbo. Did it spin freely before you put it on? Or your boost controllers on the fritz/setup wrong. Those would be my basic picks.

[subaroo]

Yeap spin free. No play etc, yeah I have a feeling is ecu or the boost controller set up is wrong. Currently boost solenoid and duty pressure solenoid vacuum lines not connected,

But that wouldn't affect it? Since I'm running 3 port boost controller

Edited April 24, 2016 by subaroo

[timmy31]

I think I have the same problem, as in when it hits boost it's not smooth/makes a hissing noise, also running a vf22. I'm running a link g4, 3 port boost solenoid. ATM I think the turbo is stuffed so just looking for a replacement VF22.

[subaroo]

Hmm possibly but I'm planning to take it to spec 2 or Highbrook automotive and see what they say

[hijacka]

Running a vf22 at 20 psi is just asking for trouble I wouldn't Wana take it any more passed 18 the compressor blades are weak. Also running a external wastegate with anything vf is total wanker factor it's most likely your issue ie to much exhaust gasses air bypassing the turbo.. the gate is probably opening and shutting opening and shutting tryin to hit the rediculous target boost pressure which would explain the surging or pulsing...

[hunter951]

 hijacka said:

Running a vf22 at 20 psi is just asking for trouble I wouldn't Wana take it any more passed 18 the compressor blades are weak. Also running a external wastegate with anything vf is total wanker factor it's most likely your issue ie to much exhaust gasses air bypassing the turbo.. the gate is probably opening and shutting opening and shutting tryin to hit the rediculous target boost pressure which would explain the surging or pulsing...

i agree a external is abit overkill. But im running a 40mm compgate (plumbed) with my vf30 and im hitting 21.5psi at 3500 and holding that till about 6500 and it slowly drops off from their. no issues at all when its unplumbed either... the issue to me sounds like 1) the computer isnt tuned for the turbo. 2) poor boost control setup. 3) poor mounting of the wastegate....

Edit: what happens if you unplug the EBC and run spring pressure only?

Edited April 25, 2016 by hunter951

[subaroo]

Running Spring pressure, full boost comes around 4500 and wastegate opens nice and sharp till redline

[Guest]

Sounds like big leak somewhere.

[hunter951]

 subaroo said:

Running Spring pressure, full boost comes around 4500 and wastegate opens nice and sharp till redline

god you should be hitting 14 by about 3500 3800....

[Guest]

With a tune vf22, g4 closed loop and mods was making 20psi by 3.5k no prob. Internal gate too.

Is your gate fcked or seat not square?

[lachlan]

Vf22 map has plenty of meat at 20 psi . Woofters

[timmy31]

I'm running a tial 38mm gate, I think the problem was my turbo as we flushed the radiator and all this gunk came out, I'm guessing the turbo is cooked.

[hijacka]

 evowrx said:

Sounds like big leak somewhere.

Yeah most likely.. and it wouldn't be unreasonable to think a 20 year old turbo would be stuffed.. god knows why people think they are the bees knees lol

[hijacka]

 lachlan said:

Vf22 map has plenty of meat at 20 psi . Woofters

Yeah a vf22 is sooo reliable at 20 psi don't forget to add a sooper cooler to your mouth to cool all that hot air

[lachlan]

the greatest flow is at 2.6 pr . And theres plenty of map at 2.4 pr 19-20 psi . Assuming a real airfilter and a quality intetcooler that isnt chewing 5 psi I fail to see your problem

[Johnnynz]

Mines gone ok at 20psi for quite some time now.

People think there the bees knees because its simple and bolt on for a gc8 with no stuffing about and they fit right in with most peoples fairly stock setups. They are a simple answer to slightly more power without needing to upgrade much around it.

Edited April 25, 2016 by Johnnynz

[Guest]

 lachlan said:

the greatest flow is at 2.6 pr . And theres plenty of map at 2.4 pr 19-20 psi . Assuming a real airfilter and a quality intetcooler that isnt chewing 5 psi I fail to see your problem

Hes talking about the strength of the comp wheel not what the map says. They are weaker in the hub and shed blades. Not every one of them does it but its common enough for people to know about it.

[subaroo]

 evowrx said:

With a tune vf22, g4 closed loop and mods was making 20psi by 3.5k no prob. Internal gate too.

Is your gate fcked or seat not square?

Purchased a brand new turbosmart one. Running outter and inner springs

[Guest]

Start the car then put your hand over the outlet see if its leaking. Wont get hot for 40 seconds or so.

[Optical]

 hijacka said:

don't forget to add a sooper cooler

sht that cracked me up... what happened to that guy?

[Johnnynz]

 Optical said:

sht that cracked me up... what happened to that guy?

Disappeared into CS Myth and legend status.

[subaroo]

No leaks from wastegate outlet, cars been throwing 44 45 CEL. it comes on then goes off, once it's on it boost cuts me. But once it's off its boost fine. Duty pressure solenoid and boost solenoid loom connect up but not vacuum's.