My Car Is Compressor Surging!

[UWISSH!]

i bought my r33 gtr 6 months ago and its got compressor surge and i dont know how to go about fixing the problem. ive heard things from changing to aftermarket BOVs, could be a tuning problem, turbos could be stuffed or possibly getting a balance pipe between the two manifolds.

when trying to accelerate in fourth and fifth gears on the freeway the car just dies in the ass and doesnt wana accelerate

im realy not sure what i should do or how i should go about fixing the problem

if it helps with advice the car is a running a HKS fcon ecu, so no AFMs

the turbos are HKS items rated to 400hp each

still running stock BOVs

i already have a PFC D-jetro to go in when i have the required funds to make tuning easier

some body please help me because it is realy starting to drive me insane

[paulr33]

draw a diagram or better yet get a photo of the engine bay

particulary the intake piping

[UWISSH!]

here is a pic of the engine bay

[VB-]

you can try playing with your boost controller to bring on boost just a tad later, although i have really never heard of compressor surge from such relatively small (in the scheme of things) turbos. BOV's should effect it if its happening under load. maybe use this as an excuse to build a stroker

could be tuning but dont really see how, its just forcing too much air in when your motor can't swallow it obviously, you might be able to tune around it but doesnt seem like the right way to do it to me. has the Fcon been tuned in aus at all, or is it ex-japan? might be an idea to throw the d jetro in anyway

[Swiper the Fox]

you can try playing with your boost controller to bring on boost just a tad later, although i have really never heard of compressor surge from such relatively small (in the scheme of things) turbos. BOV's should effect it if its happening under load. maybe use this as an excuse to build a stroker

could be tuning but dont really see how, its just forcing too much air in when your motor can't swallow it obviously, you might be able to tune around it but doesnt seem like the right way to do it to me. has the Fcon been tuned in aus at all, or is it ex-japan? might be an idea to throw the d jetro in anyway

Some info that might be handy...

Our 2530's used to choof like a steam train...Jim at Croydon's completely tuned it out. We had both the inlet pipes balanced after the AFM's...obviously not your problem. We switched to GT-RS's and it was back...bigger and badder than ever...we fitted a set of HKS balance pipe manifolds and it completely disappeared.

What turbo's are you running?

[UWISSH!]

Some info that might be handy...

Our 2530's used to choof like a steam train...Jim at Croydon's completely tuned it out. We had both the inlet pipes balanced after the AFM's...obviously not your problem. We switched to GT-RS's and it was back...bigger and badder than ever...we fitted a set of HKS balance pipe manifolds and it completely disappeared.

What turbo's are you running?

im not exactly sure what turbos they are, was told that they are rated to 400hp each, they have HKS cast onto the compressor housing aswell but yeh not exactly sure as i cant read what it says on them

where did u purchase the HKS manifolds from as i would like to get a set if it fixed your prblem straight away

[jeffworld2]

how does one "balance" the intake manifolds? do you mean similar to tuned length etc. or do you mean a pipe crossing between?

mine is also a steam train lol

[BezerkR32]

your lucky paul answered your question and not all the other qualified mechanics on here lol, cause they reckon coil packs fix everything.

here is a pic of the engine bay

[ITZTRU]

your lucky paul answered your question and not all the other qualified mechanics on here lol, cause they reckon coil packs fix everything.

hahaha...i'm no mechanic, nor do i know what ur problem is...but this is true...i hear a lot of people talking about changing the coilpacks haha

[R31Nismoid]

Id be finding out what turbos you have

Just a case of the turbo being too big for the motor in its current form, too much air from the turbos, not enough going in = surge.

[Swiper the Fox]

how does one "balance" the intake manifolds? do you mean similar to tuned length etc. or do you mean a pipe crossing between?

mine is also a steam train lol

pipe crossing in between after the AFM's...but not the problem due to the lack of them.

Id bet my balls the turbo's are 2540's as it is a common problem with them

I have a set of genuine stainless HKS balance pipe manifolds in stock but they are as rare as hens teeth and id want good coin for them.

Edited July 18, 2008 by DiRTgarage

[UWISSH!]

pipe crossing in between after the AFM's...but not the problem due to the lack of them.

Id bet my balls the turbo's are 2540's as it is a common problem with them

I have a set of genuine stainless HKS balance pipe manifolds in stock but they are as rare as hens teeth and id want good coin for them.

could u pm me about how much u would want for them if u dont wont to post bit up here

[9krpm]

a good set of high flow air filters will also help

[VB-]

how exactly?

[9krpm]

how exactly?

Better airflow through the filters reduces the negative pressure difference in front of the 2 turbo.

In my car I had 2x HKS filters. I've never been a fan of foam filters and the car is still street register so it sees a bit of dust on the roads. I changed them to a pair of apexi. I instantly had more choochoo. I cleaned them with K&N air filter cleaner and did not reoil them. The surges went away. Now it only surges at cold night when it overboost past 2bars.

I may give these balanced hks manifolds a try if Paul accept bucket of Aud gold coins

[UWISSH!]

Better airflow through the filters reduces the negative pressure difference in front of the 2 turbo.

In my car I had 2x HKS filters. I've never been a fan of foam filters and the car is still street register so it sees a bit of dust on the roads. I changed them to a pair of apexi. I instantly had more choochoo. I cleaned them with K&N air filter cleaner and did not reoil them. The surges went away. Now it only surges at cold night when it overboost past 2bars.

I may give these balanced hks manifolds a try if Paul accept bucket of Aud gold coins

the pic i posted up is 6 months old. the car no longer has the hks mushroom filters, im now using twin K&N filters and it makes no difference to the car at all

[jeffworld2]

9krpm: i dont think your talking about the same thing. Mine does not choo-choo when overboosting past 2 bars, it choo choos when sitting on 70km in 4th gear. under boost, the engine is taking all the air in so it sounds like a normal car. I think your idea may have some merit tho i might take the filter off altogether one day and see.

my motor is a 25 with twin gt-ss. the intake is basically both turbos fed through a single afm, so there is only one pod atm.

I am using an rb25 power fc so i need to keep the afm at this point. i am very happy with the tune so would only switch to a non-afm ecu so i can get a better intake happening to get rid of this noise, which i cant really justify doing. $$

if there is any advice out there of how it can be helped tho im very interested. Im not afraid to do some work but i cant really change to dual afm or map.

[zeko33]

dude check if the stock bov's are blocked someone may have blocked them to get the compressor surge

[series2r33]

Just up from the 2 blue silicone joiners u have another joiner. Whats that made out of? Any chance extra airs getting in through the material? I shit myself when i had a silicon joiner come of completely, car died lol. But on yours if theres just a bit getting through maybe its contributing towards your car playing up?

[Al]

...............when trying to accelerate in fourth and fifth gears on the freeway the car just dies in the ass and doesnt wana accelerate

im realy not sure what i should do or how i should go about fixing the problem

Just re-read his initial post and this does not sound like compressor surge at all.

When my rb25 surged, with a maximum hi-flowed turbo, it still made power and accelerated but you would feel the surge, back and forth, and the turbo made flutter sounds.

What you have described seems to be more of a tuning issue. I assume the car came from Japan with the existing mods. Having no idea of it's history, mods before sale, tuning w/shop, fuel, etc you can't expect it to drive properly using Australian 98ron shitty fuel, without a full retune.

Have you put the car on a dyno, to see exactly what the car is doing and have a look at the a/f ratios?

Saving the $'s to fit the Pfc and get a proper tune to suit Australian fuel would be my first priority. I wouldn't try to save a few bucks buy going to a cheaper unknown tuner either, as the tune is the biggest component of any car's setup, especially when you have a d-jetro Pfc, which is a little different than your usual Pfc.

All the best, but get the current tune looked at before spending any money on changing components, just to find the same problem exists.