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Super Rich Stagea

Spammeoff
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Spammeoff Contributor

Spammeoff

Posted
Posted

Put my Series 1 RSFOUR on the Dyno last night to see if it made factory power and look at the A/F's. It made 180rwhp (had front driveshaft disconnected for RWD dyno'ing) at about 6500rpm on about 6-7psi (factory solenoid high mode). So if you figure on 240hp @flywheel, and maybe 25% losses then 180hp is about right.

But it was superduper rich throughout which I kinda see as a problem! At idle it achieved 13.5-14.5:1, so made me think the o2 sensor was working in closed loop mode, but at cruise (about 10in. Vac - 2000rpm - 4hp) it went straight to between 11.1 - 11.4 :1, stupidly rich. And on a full power run it goes off the meter at the top end, running around 10:1 before meter says 'too rich' and stops measuring.

I discovered the factory bov was leaking when we pressurised the intake path with an air compressor to check for leaks (had to disconnect and block the bov recirc line to check for bov leakage). So tried another std nissan bov they had lying around, it too leaked (both leaked from 2-6psi). Wondered if other ppl's might be? I squashed mine up in the vice to increase spring tension (butcher I know but gonna replace it), but still leaked. But it's full recirc after afm, so wouldn't be causing richness.

Sooo I'm thinking i'm on a hunt for faulty components causing the richness before I just tune it out with a piggyback. If something's wrong best I fix it instead of just tuning away.

But I'm wondering if other guys with std Stagea's have seen similiar A/f's on the dyno???

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https://www.sau.com.au/forums/topic/116446-super-rich-stagea/
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Ska Grand Master

Ska

Posted
Posted

Stock NIssan ECU's = SUPERMEGAHAPPYRICH fuel mixtures, my stock R33 ran as low as 7.5:1 running stock ECU, I would assume that the stock Stagea ecu would be about the same..?

All the RB25DET stock BOV's leak, if you do some searching you'll find out all kind of stuff about the stocker BOV.

Tangles Grand Master

Tangles

Posted
Posted
Stock NIssan ECU's = SUPERMEGAHAPPYRICH fuel mixtures, my stock R33 ran as low as 7.5:1 running stock ECU, I would assume that the stock Stagea ecu would be about the same..?

All the RB25DET stock BOV's leak, if you do some searching you'll find out all kind of stuff about the stocker BOV.

I have a feeling that the Stagea ecu is slightly different, in the outer case at least), as in you cant read error codes on the ecu on a stagea but can on an R33 (true?).

I suggest getting a SAFC and tune that beast! 12:1 all the way.

Spammeoff Contributor

Spammeoff

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Posted

Sweet I'm pleased to hear my car probably isn't broken and slammin' rich is the norm. You'd have to ask why though.. like what was running through the ecu engineer's mind? I know altitude - temp - etc but shit.

I'm probably planning on Greddy e-manage 2, supposedly they're the way. Dyno guy is tuning on one a car soon so he'll say how it goes. Bout 1k to buy, and has usb connection, designed for tuning with laptop which i figure is handy (if ya got one).

Tangles Grand Master

Tangles

Posted
Posted (edited)
Tangles, is the SITC a little blue screen version of the ITC? I never knew they existed!

SITC had 5 dials that you can alter the Ignition Timing on....... no screens, although they give a nice glow when the powers on.

Apexi Super-ITC or Super Ignition Timing Converter

see SK's thread, pics and all: http://www.skylinesaustralia.com/forums/in...c=80642&hl=sitc

Edited by Tangles
Tangles Grand Master

Tangles

Posted
Posted
wicked, im about to pick one up to compliment my SAFCII. It was sold as a ITC not a SITC, so I thought there might have been a difference.

Thanks mate.

No probs!!

I gained 20kw when I added the SITC and a fuel pump (direct wired) & Z32 afm, tuned at 12psi up from 10psi. Best of luck with it.

fyi: I got a Brand New SITC off ebay for $200US LOL, never ever seen another brand new one for sale.

66yostagea Grand Master

66yostagea

Posted
Posted

As I said earlier I wanted to get the S1 tuned as I thought it was running a bit rich. 15+/100kms, plus the exhaust is very sooty.

All the technical terminology in this topic puts me off a bit.

What is a simple economical method of getting a tune up?

Ska Grand Master

Ska

Posted
Posted

Take it to a trusted tuner, give him lots of $$ and get your vehicle back with a couple of extra piggyback ecu's and a decent tune. Easy :/

Or buy what Tangles bought, SAFC (Super Air Flow Converter I think..?) or a SAFCII (Same but a newer version) and the SITC (as explained by Tangles) and then install them yourself if you have the knowhow or take them to a tuner and get him to install and tune.

There are heaps of different ways to do this, all depending on price range and what tuner you take it to.

For example I have a Power-FC, which is a replacement ECU, but it had to be dodgy wired in because you cant buy one for a RSFour, but it allows a huge range of tuning capabilities. It would also cost you around the $1500 mark, plus all the stuffinf around to get it to work.

Or there is the GReddy E-Manage, which is a piggyback ecu, but has a lot of features, esp when combined with a Profec E-01. Again fairly expensive from what I have heard, ~$1500........?

Or there are several small piggyback ecu's you can get that do specific jobs, SAFC (Fuel mixture controller), SITC (ignition timing controller), AVCR (boost controller).

It all depends on what either your personal preference is or what your tuners preference is.

Not all tuners know or want to tune all ecu's, I havnt found anyone here in Rockhampton that can tune my Power-FC, mainly because I dont have a hand controller, so they would need to run some sort of program to control the Power-FC, like my old tuner in Brisbane did, meaning if I did want it re-tuned then I will have to drive down to Brisbane for a tune.

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