Hks2535 Not Holding Boost

[paulr33]

gcg.com.au and get a new actuator

no need for a hks specific one

[reflex]

does it feel like its going as hard on 14psi as it originally was?

with 244rwkw it should be spinning in 2nd and some of 3rd with the big phat mid-range this turbo produces

[Cubes]

Or anywhere really.. ATS here in Adelaide do them for $120, they are adjustable + they come in various pressure levels. Right up to 17psi from memory.

[silva33]

does it feel like its going as hard on 14psi as it originally was?

with 244rwkw it should be spinning in 2nd and some of 3rd with the big phat mid-range this turbo produces

<{POST_SNAPBACK}>

It felt great at 14psi but i have been told my my mechanic that it didnt feel like 244rwkw at all... I havent driven it since i had the problem as i didnt want to pick the car up if it wasnt 100%

In my opinion it feels great (but i havent drivent anything to compare it to), and pulls hard but deinatley wont spin 2nd unless i really abuse it and never 3rd no matter what i do..

What sort of power did yours make??

[reflex]

i made less than yours.. 231rwkw

i have 255 tryes on the back with 80% tread.

if i come out of a round about in 2nd and stomp on it they will spin from 4000rpm onwards and i get some spin in 3rd but not much...

really scary at first because it would come on boost rapidly and push u back into the seat...

apparently the dyno my car was tuned is a bit tight and there might be an extra 8-10kw in it but who cares.

[silva33]

I dunno, i did a dyno day in shoot out mod without touching the car from the 244rwkw and it made 211rwkw (35 degree day) and then yesterday he put it on the dyno (non Shhot out) and it made 200ish, then 220 with a touch of the tune and 16psi...

The difference between the 244 rwkw and the 211 to now is, i just had injectors installed and a Z32 AFM and an EBC...

[reflex]

if the turbo is gone that too bad. has it been retuned since the injectors and afm have gone in???

im looking to upgrade the injectors, run more boost and add a cam gear in the next few weeks, i hope i dont have these issues

[silva33]

Im only having trouble with the addition of Injectors, Z32 and EBC with more boost... The only problem is that i wont hold the 17-18psi it is given... It hits 18psi then drops strainght back to 12psi, anything more than about 14-15psi and it jsut drops off...

Previously i was running 244 rwkw witrh the stock injectors stock AFM and no boost controller with the stock nissan actuator

[Robo's]

Dave

Should be able to hold alot more boost top end. With my 2535, im getting 20psi in the middle and it holds 18psi up top, so doesn't fall off too much.

[The Dan]

Just wondering, isn't there supposed to be a boost solenoid on the 33's which regulates boost to around 14psi as a failsafe? If so, doesn't it have to be disconnected to run anything higher?

[klys]

I was reading the different posts here...

I have a Z32 MAF, 440cc injectors and HKS GT2535

My power cuts off at 6800 RPM at 15 PSI I'd like to get it abvove 7000 though

I also have a 2.2L tomei kit with cams(I don't know which)

at what RPM does your power stop?

[GTshortie]

Hey Silva33, can you post a pic of your dyno graph showing us the drop in boost?

'I'M HAVING A SIMILAR PROBLEM' but my turbo is alot smaller similar to a 2530 but still i believe it should hold more boost then what is doing currently.

Garret T3/T4 A/R0.60 Compressor i think the rear is a tiny 0.58 turbine.

200rwkw@5000rpm peak 1.0bar of boost and down to around 10psi at redline

210rwkw@5000rpm peak 1.30bar and down to 12.5psi at redline.

running a avc-r boost controoler.

here is my graph

[GTshortie]

.<double post sorry>

[silva33]

i found the problem, it was just a cracked intercooler pipe which has been replaced and now all is well.

I think the 2530 size turbos will have trouble holding boost no matter what u do, and you wont be able to do much about it....

[warriorbrawl]

Damn you just beat me to it I was reading thru all the posts to make sure no one had already suggested it!

I once had a split in my silicone connector for the FMIC and it was the same problem as you were having.

It can be hard to tell with all the induction noise and revs etc.

you keep looking for more boost and it is doing it, its just not getting thru to the inlet manifold.

well done.

[silva33]

yeah the mechanic did a pressure test of the front half of the pipes to the turbo and found there was a leak, it was hard to find even then knowing it was in the piping...