happydude303

iTrader: (1)

also if the joiner is 57mm the silicone hose bothe ends are 76 will they clamp down that far or am i missing somthing here

Big 'D'

Forge motorsport UK do them mate and usually next day delivery too.

Cheers Iain

Big 'D'

Use a piece of silicone pipe to pack out the smaller pipe joiner so that it fits in the 76mm pipe and you won't have to clamp it down any further than it is already.

Cheers Iain

harvey

iTrader: (48)

You have fitted a silicon inlet tract that is bigger diameter than the item it replaced and therefore the velocity of the air to the compressor wheel is slower now than it was previously. Just changing to a different inlet tract can get rid of this type of problem and I guess there is cavitation taking place in front of the compressor wheel as the air is pulled in to the compressor wheel. This can be cured in a number of different ways. You could try constricting the silicon inlet tract just before the compressor using a strong pipe clamp for instance and in the extreme putting in a restrictor like a smaller diameter joiner as suggested above. However, to be effective this has to be done in proximity to the compressor wheel. I have seen instances where just pushing in the side of the silicon inlet tract wall at the point where it narrows to clear number 3 inlet runner cures the problem. HTH.

Big 'D'

Fitting the smaller diameter pipe joiner fitted at the point where the blue and red silicone hoses are on your car will work just fine and is very effective.

Cheers Iain

happydude303

iTrader: (1)

thnaks guys for the good advice i have now purchased my pipe joiner one at 56mm and one at 63mm i will pop these on and see how i go the problem is this auto bann inlet pipe is 56mm at the turbo end but at the end where the air filier goes into it 75mm why the hell do they make these pipes with the right size one end and the other end far to big

happydude303

iTrader: (1)

right i have tried the first joiner at 63mm and this has made it better i have to reall load it to get this flutter but now i shall try the 57mm one and hope this sort it or its back to a standard inlet pipe not happy lol

happydude303

iTrader: (1)

[quote=happydude303;9661977][IMG][/IMG]


the piece of metthe litle breather i ahve blocked just before it goes under th einlet manifod is there any better i could use as im not sure this is sealing as good as it could be, any sugestions

happydude303

iTrader: (1)

right i have fitted the 57o/d joiner which is probalyy 56mm on the inside adn it has sorted it out in 1.2.3.4.5 and in 6th it does it for about a second or 2 then the boost pluus back and its fine so i think the sim tec need s to not make as much boost ion 6th and job done cheers again every one

Big 'D'

Good result fella

Cheers Iain

Cannon Fodder

iTrader: (100)

Only just read this thread fully and I have a similar problem.

I have a Spec C with a VF36 and have recently fitted the following - RCM induction kit, cold air feed from the o/s foglight cover and a Samco connecting hose to the standard turbo air intake hose.

I've also fitted an uprated 1.2 bar wastegate actuator and had the car remapped by Bob Rawle after the modifications were fitted (driven off boost until Bob mapped it) but now when approaching 1.5 bar of boost I am getting compressor wheel surge when I am accelerating but only when not giving it full beans. My Defi boost gauge is getting to 1.5 bar and then the needle just stutters as the surging occurs.

If I drive it like I stole it then it does not happen or not even a hint of surge at all, I would think that surge would be evident when approaching 1.5 bar regardless of how hard the car is being pushed.

Any suggestions on how to remedy / overcome this problem?

Cannon Fodder

iTrader: (100)

Sorry forgot to say also had a 3 port boost solenoid fitted at the same time as the mapping.

Shaun

Cannon Fodder,
This is the EXACT reason why I never stuck with an induction kit when I did all the testing of this stuff back in 2005 / 2006. VF36 / VF37 are renowned for this when you open up the inlet.

You will only get surge (based on your set-up) when you come on boost between a specific rev range around the 3k mark in the higher loaded gears. If you drive through the gears hard you may only get it in the first gear you are charging through. The subsequent gears won't experience it as you will normally be past the surge line (after say 3k) when the revs drop for the next gear, but are still fairly high.

Simple solution is to keep the OE inlet and airbox / filter. IMO you simply do not need an induction kit at this level.

The surge sounds crap and feels crap when driving normally and is not acceptable in my opinion. Some people ignore it.... I can't say I would.

Cannon Fodder

iTrader: (100)

Shaun, funnily enough I remember you stating on a thread I started not long after I picked up my Spec C about the perils of fitting an induction kit to a JDM twin scroll.

Is there a specific region as to why the VF36/37 suffer from this issue? Also do you know if the VF42 has the same problem as I know a member with the same setup who has never said he had this problem.

The problem seems to be in the higher gears when accelerating up from around 3K and accelerating moderately with the boost from just under 1 bar upto 1.5 bar.

Next year I'm probably going to be fitting a Litchfield LM420 or 450 and at the same time a FMIC so I would have to fit an induction kit, do you know if the Litchfield turbos suffer from this surge when using an induction kit?

Unfortunately I gave my factory air intake system away to a local member who has an issue with his aftermarket air intake (carbon fibre box, intake tract etc) but his problem was due to it allowing unfiltered air through potentially destroying his MAF.

Oh well you live and learn.

Shaun

From my understanding it is the inability for the engine to consume the increased air that the 36 / 37 trys to push through the engine, when the inlet is altered affecting the air flow.

I am not aware of an issue with the LM's but have not tried an induction kit personally to find out. I have no intention of changing from the OE airbox unless I find it's limits with any future turbo, but I do believe that an appropriate induction / inlet combination will combat any possible surge issues on a twinscroll set-up. I suspect from the testing that Litchfields have already done, something like their Forge kit gets around this problem.

IIRC I experienced problems between 3k-4k rpm with surge from swapping out the OE airbox.

You can read the detail of my findings (documented in 2006) here from this page until page 22.

https://www.scoobynet.com/577925-eng...ge-1-a-12.html

Hope the information and testing documented helps.

Cannon Fodder

iTrader: (100)

Thanks Shaun, when you say Forge kit what is that?

I'll take a read of your findings as well.

midnight

iTrader: (10)

Some real interesting reading here guys,as i have fitted samco inlet hoses on both my last 2 impreza's and have not suffered any compressor surge on either car . I have kept the std airbox fitted and both cars were mapped by bob rawle ,and the later car pulled slightly more boost than the 1st one but no noises from the turbo.

Yet my mate mark who has damn near identical mods as my own is starting to get compressor surge on his 2nd vf28 turbo(1st one went bang ),and as far as i am aware he has the std black inlet tract on his car . I know some of the plastic inlet tubes can start collapsing when you increase boost,but if his inlet tract had a leak/crack in it ,could this be be another reason he is suffering from compressor surge

Shaun

The Forge induction kit that Litchfields sell.

Cannon Fodder

iTrader: (100)

Is it a cold air induction system located in the inner wing? I've had a look at Litchfield's website and there doesn't appear to be any information listed.

Is the intake pipework designed in order to allow the correct airflow and stop the turbo being swamped by excess air I wonder?

Had a good read of your comprehensive guide and I have to say that it is a good resource and I'll be using it from now on.

I did think having used an RCM induction kit on my previous Hawkeye WRX that it is a quality piece of kit but obviously no good for twin scroll models.

Shaun

It's shown and discussed here -> http://www.litchfieldimports.co.uk/U...mancepacks.asp

It's listed on the turbo information page (from homepage) as TBA for the price, but I know of at least one car that had one fitted recently (MY06 JDM STI).

Probably best to call Litchfields to enquire about price and how it combats surge, but yes I expect it is entirely down to the inlet piping.

I'm up with Iain tomorrow so I will ask about it if I remember.

Cannon Fodder

iTrader: (100)

I would appreciate it Shaun if you could find out about the induction kit for me if you are going to Litchfield's tomorrow.

Cannon Fodder

iTrader: (100)

Shaun, did you get a chance to enquire about the Forge induction kit as I've not had a chance to call Litchfield Imports.

Shaun

Sorry.... Iain had meetings most of the day and the time I had was used up discussing my project stuff.

Best give him a call on Monday.

Cannon Fodder

iTrader: (100)

No problem, I'll give Iain a call next week.