EFI University

[Techsalvager]

So I did some pulls at my current boost level and came up with this
I dynoed in at 220hp\230tq to the wheels on a dynojet at 22psi tappering to 16psi, I believe the wastegate spring is to weak to hold the valve closed as stock its around 6psi spring

[Roberto Arano]

can't you watch/monitor/put a tell-tale on the wastegate arm to see if it is opening? (assuming not an external w.g)
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[giskard]

BTW a larger diameter wastegate can for the same cracking pressure, will have a stronger spring.

You can calculate the effect of backpressure on wastegate cracking pressure if you know the diameter of the swing valve.

[Roberto Arano]

does anyone know of a good source for dual port internal wastegate actuators "cans"....was a long time ago but I think some cars like the 3sgte all-trac had them. might be fuzzy memory though.
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[C. Ludwig]

I know the 3SGTE MR2s had them.
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Haltech, AEM, Apexi PFC Sales, Installation, Tuning
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[Techsalvager]

I was debating about making a downpipe with an EWG or find a dual port IWG with stiffer spring.
IWG would be the easier of the two but the EWG would seperate the airflow from the turbine until a later point down or keep it seperated

I just noticed at 5500 I have a vtec like effect and it seems on the compressor map its transitioning into the most efficecnt zone.

Another thing I was thinking is downgrading to a t3 50 trim turbo unit instead.
That or saving for a ram horn manifold and see how much more effective it is compared to this cast iron log manifold.

[Pantera EFI]

Your effort is great but supplied information is limited.

Map your Turbine Pressure.

Then look for a high Delta Pressure area of the map.

Lance

[keithmac]

On my Mitsubishi GTO Twin Turbo, running 6psi actuators the maximum I could get out of the turbos was 20 psi before the wastegates opened (with no reference lines on the actuators) due to the force of the exhaust on the wg flappers.

I fitted a pair of forge actuators with 18psi base springs in them, good to 26psi
so far and going to try for 30psi..

[Techsalvager]

[stevieturbo]

All this talk, and not a single mention of what you're actually using for boost control, and how much air you're bleeding off the w/g at present
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LS1, V7 YSi

9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0

[Techsalvager]

[stevieturbo]

So it's just a simple mechanical valve ?

IMO you'd be better with a 3 port controlled via the ecu. It will work much better and give you more control than a simple mechanical valve

Have you tried placing a restrictor in the line feeding the valve ?

Chances are yes the w/g is simply too soft. Just querying that you are actually at that stage though.
IMO you need a better control system than a basic valve though, and it will probably allow you more boost.

Simple test, disconnect any pipework from the w/g actuator and see how much boost the engine will make at various rpm's
_________________
LS1, V7 YSi

9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0

[Tomak]

No need for all the theory, guesswork and tech talk.... all pointless when you are faced with insufficient data, no turbine maps, anitquated "best guess" compressor maps etc etc.

The 6 psi spring is no longer enough to keep the flapper closed against back pressure.. Simple.

That's why we run C02 when we need weak springs, but still need 40 psi boost.

If you want more boost today, piggy back a helper spring onto your swing valve.
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Analog DD 450
Mustang MD250 - gone but not forgotten.

[Roberto Arano]

On traction limited street cars I used a small air air compressor rather than CO2. All fits within the spare tire , which you can use as a resevoir. On small displacement cars that can build boost at cruise speed (low throttle angle) keeping the wastegate open at cruise may reduce pumping losses.
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[Techsalvager]

I'm doing this to figure out where I am landing on the compressor map. I believe the turbo is to big for my goals.
In 2nd gear I"m not getting good power output till 5k rpms, horrendous.
It is old technology as well though.
another set of data

The only other thing I can think to do without doing head work is to get a better flow exhaust manifold instead of this log.

both 2nd gear pulls


img upload

[C. Ludwig]

Is this a 1.6 or 1.8? The Super 60 is a GREAT fit for the 1.8.
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Haltech, AEM, Apexi PFC Sales, Installation, Tuning
Custom Harness Solutions
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[Techsalvager]

1.6l and it is just a 60 trim, not a super 60 trim

[Roberto Arano]

what turbine & housing a/r ?
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[Techsalvager]

[Evodelta]

You are being a bit 'light' on information, how can you expect help when you don't give people the tools they need?
Is it Top Secret?

Engine type, size, full specification, what you expect, what you have done, etc.

It shouldn't be like pulling teeth.....