Silvia Club of NSW

so quit your whinging and wind the boost up!!

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M35 Stagea.info @ http://www.m35stagea.info/

hahaha need to recalabrate the O2 sensor first and get it roughly tuned first. Spoke with Haltech yesterday they seem to think that SF must have turned the ignition on and off while the O2 sensor was out of the car which has stuffed the calibration.

Also noticed I have no sound coming from my speakers since I got it back from SF, not sure what the go is there.

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I didn’t break it, I just modified the operational status...
There are 10 types of people in this world, those that understand binary, and those that don't.

All the BB turbos i've had audibly spun down for 20-30sec.

If you got the 52 trim, i'd highly doubt it isn't BB

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Disclaimer: I actually DO know everything

Sil80 - SR20DET 231rwkw
Silvia Race Nugget - SR20DET 225rwkw
Stagea - DeathWagon - RB25DET 185rwkw.

My Lame Gallery: http://www.toomuchboost.com/gallery/main.php

It was sold to me as a BB, but funny I can't hear that very destinctive rolling on. I think the quicker response is probably related to it being BB so I am a bit confused.

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I didn’t break it, I just modified the operational status...
There are 10 types of people in this world, those that understand binary, and those that don't.

yeah mine does that. first few times it happened i thought something was wrong!!

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M35 Stagea.info @ http://www.m35stagea.info/

Next you should get a decent ECU

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Disclaimer: I actually DO know everything

Sil80 - SR20DET 231rwkw
Silvia Race Nugget - SR20DET 225rwkw
Stagea - DeathWagon - RB25DET 185rwkw.

My Lame Gallery: http://www.toomuchboost.com/gallery/main.php

only if you buy it for me lol

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M35 Stagea.info @ http://www.m35stagea.info/

I haven't really had any issue with the ECU since I got the right patch cable for it. I actually like having an ECU that I have duel fuel maps so I can tune for economy and power.

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I didn’t break it, I just modified the operational status...
There are 10 types of people in this world, those that understand binary, and those that don't.

The powerfc have a bunch of fuel maps for power and economy.. They are controlled my my right foot! Get the map right once. Duel maps are a wank

MAP sensed cars will never be as good on the street as AFM cars. I've had a haltech and will never go back to MAP sensed again

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Disclaimer: I actually DO know everything

Sil80 - SR20DET 231rwkw
Silvia Race Nugget - SR20DET 225rwkw
Stagea - DeathWagon - RB25DET 185rwkw.

My Lame Gallery: http://www.toomuchboost.com/gallery/main.php

Huh? why do you say that, if they are tuned right they should work fine, my mates GTR runs off MAP sensors, and my rally car, never had a drama with them...all the expensive computers like MoTeCs use MAP sensors instead of AFMs?

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I think the problem is more to do with the lower resolution of MAP sensors compared to AFMs, on the street where smoothness is desirable MAP isn't quite as good.
That is why I'm told most OEM cars have hotwire AFMs.

Personally never driven a map sensed car though.

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1996 180sx
1990 Silvia

The difference is pretty simple.

When calculating the Air / Fuel ratios, the mass of the air is the important part (because the volume and density change with temperature, altitude, etc).

A hotwire MAF (Mass Air Flow) sensor directly measures the air mass entering the engine, so the ECU can calculate the fuelling easily from that.

A MAP (Manifold Absolute Pressure) sensed setup guesses the air mass based on the pressure in the manifold, and a separate air temperature sensor. Non linear relationships between pressure, temperature, and flow - as well as a sensitivity to any modifications the engine's flow or efficiency mean that the MAP sensed system can never be as accurate or repeatable as MAF.

On serious race cars it's less of a problem, to the point that most race engines only use the MAP sensor to work out the atmospheric pressure on the day, and all airflow calculations are based purely on throttle position.
Turbo engines need the pressure sensing obviously, but due to the inaccuracies present a larger error margin needs to be included in the tune.

It's very easy to pick a car running an aftermarket MAP sensed ECU compared to a MAF setup. There's always some areas of slight hesitation and roughness in the tune.
Factory MAP sensed cars do a bit better, but only while all parts are factory. Change the exhaust and you'll need to re tune. Change something like cams and the car won't even start...

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The Engine Whisperer - fixer of things

ok O2 sensor recallabrated and tuning is well under way. I set the boost controller to 100% above 2000 rpm. Boost seems to top out about 15.5 psi.

Just curious should this turbo make more boost than this? I think possibly the stock IC is holding it back a few pounds.

The results... well funny, but all of a sudden I have clutch slip I never had before Guess that was a given just waiting to happen.

But when it not slipping it pulls quite hard. Still would like more power though. Guess the more you have the more you want. Checked the injector duty cycle and at max boost it hit 78.5%

How far can I push the injector friendship before it melts?

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I didn’t break it, I just modified the operational status...
There are 10 types of people in this world, those that understand binary, and those that don't.

I wouldn't push it much more than that, but plenty of people run well into the 90s without issues.

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The Engine Whisperer - fixer of things

You've got a bit more to play with in the injectors, but only about 10%.

The turbo is easily capable of pushing 25psi plus through the midrange but will drop back a bit at the top end to about 20 psi or so, depending on how your head flows and the size of your cams.

I think an intercooler should be your next investment though

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meh