Moonstone Steve.

iTrader: (2)

Can someone tell me if these are good/bad or somewhere inbetween please.

On cruise its reading mid 15's, on boost flat out it reads 11.3 at peak boost rising to 12 and on tickover its reading 12.5.

Many thanks.

Steve

J1mbo

iTrader: (1)

Too weak on cruise and slightly rich on tick over, problem with tockover is cosies don't like much weaker than that so not far off

11.3 is too rich but when it climbs to 12 that's spot on

But what gauge are you using?nas most the aftermarkets we have done back to back with our kit can be reasonably close to way off!

Moonstone Steve.

iTrader: (2)

AEM Jimbo.

J1mbo

iTrader: (1)

Don't know what they're like tbh mate but if its decent that map could do with a little work IMO

pieterjan

iTrader: (4)

What sort of afr gauge do you recommend?

Raj_FRST

i would also like to know this

chaffe

sounds spot on to me

cossiedave

iTrader: (1)

my 550 bhp escort is 13s on tickover, cruise 14s flat out at 32 psi i see 11.4 11.7 and that was mapped by you know who jimbo

J1mbo

iTrader: (1)

That's good dave, Id have slightly more fuel in on cruise dependant what revs really I like to see mid to high 13s on mine

Chaffe, mid 15s on cruise is that where you'd map?

J1mbo

iTrader: (1)

Pieter, I don't run one tbh, and I don't know what I'd recommend, the ls2 innovate is pretty poor going by a customers one.

I go by our own kit, It'd be interesting to do back to back and record data to give a definitive awnser but unfortunately I can't

cossiedave

iTrader: (1)

jim you have a pm

scoooby slayer

iTrader: (4)

aem are good, the supra runs 10.9 - 11 afr on tdis ŁŁŁŁ gear, my aem shows 11.2 so within 0.2 and Ł130 cant be bad imo.
both my old skyline and supra cruise in the high 15s to low 16s and have both been capable of almost 30mpg which is good imo for big sixes.

my aem was stuffed in the back box when i first got the car and quite a few on here said that wont work as it was in a massive pipe, but it did work and the aem showed leaning off big style, which it did on the dyno just the same with ŁŁŁŁ worth of wideband equipment.

was you aem not in when the car was being mapped, or straight after mapping ? have the afrs changed since mapping most importantly ?

pieterjan

iTrader: (4)

I have a tech edge 2j1 and i'm happy whit it. I've had an innovate LC-1 but had lots of trouble whit it.

chaffe

i would map leaner if possible for fuel economy

chaffe

high 13's on cruise must be awfull on fuel jimbo? id aim for 15-16 tbh

James @ M Developments.

iTrader: (2)

Any yb can cruise just fine at lambda 1 and that's what I would aim for.

tabetha

Don't know about the afr(@ idle), but my old 200K engine idled at 0.87% co , 137ppm, which is very clean imo.
tabetha

J1mbo

iTrader: (1)

Wow, leave you to it! Mpg are not bad where we tend to map, like I say high 13s

Go over the 14mark, or nearer lambda 1 and you can hear cosies are unhappy and don't drive as nice

Just my opinion of course

James @ M Developments.

iTrader: (2)

So were the green top saffs and escorts unhappy? As they were all closed loop and cruised at lambda 1 from factory

James @ M Developments.

iTrader: (2)

High 13s is ok though, hey I've seen some cruise in the 9s lol

J1mbo

iTrader: (1)

James, were they 500bhp with lairy cams? You just said any yb will cruise at 14.7, I dissagree

I've been mapping the above today and it will not have it, you can hear it just dosnt like it at all and can tell it's so much nicer with a touch more fuel in

But even calmer spec, 440 t38 lump still could only give it 13.8s ish before it didn't want to have it.

I'll map by the way it sounds, you can tell when a yb is happy, as you will know, its in the 13s, you can tell the instant you take it from high 13s to mid14s

Anyway just my opinion! Everyone has their own idea and won't change the way they map by someone on the net lol!

James @ M Developments.

iTrader: (2)

I've done plenty of 500-600 bhp ybs and all cruise at lambda 1 with no probs, most using big injectors are closed loop controlled aswell.

J1mbo

iTrader: (1)

Like I say, each to their own!

DazC

iTrader: (1)

My 7.5:1 compression CVH doesn't like it much leaner than 14.2:1. I've been aiming it around the 14.0:1 mark on idle and cruise.

J1mbo

iTrader: (1)

Daz, my high comp cvh similar to yours is the same, won't have over 14

DazC

iTrader: (1)

I still get over 35mpg on a run down to pod so it's not too bad being set at 14:1.

I built a CVH for AJC in the red RS16I he had and that was fine into the 15s.

James @ M Developments.

iTrader: (2)

We aim to cruise cvhs in the high 13s

J1mbo

iTrader: (1)

Daz, mine could return 29mpg with a play aswell. Vie not been good enough on the new engine to see what it can do purely on a run I think 30s is achievable, my escort is as aerodynamic as a brick mind,lift off and it's like someones got the handbrake on

DazC

iTrader: (1)

Can't be as bad as an S1 for aerodynamics surely Jim!!

chaffe

jimbo, if your cams are that lairy then your afr on cruise will not be a true reading as there willbe a lot of unburnt fuel entering the exhaust.

J1mbo

iTrader: (1)

Mines got a flat 500 splitter and canards, with morettes with no centre lights too, it's pretty poor

They're not that lairy, and at 3k (cruising rpm) the overlap you hear on tick over isn't really there

chaffe

it must be unless you have variable cam timing lol

Stu @ M Developments

iTrader: (12)

Lairy cams do of course make a difference as they not only create charge dilution at low piston speeds but they also drop the intake velocity down drastically which greatly affects mixture distribution. The affect on mixture distribution often needs to be offset somewhat by an excellent quality plug with a bigger gap. I am sure you have all noticed a quality Iridium plug with run a CVH and a YB better at 15:1 that some iron girder like 071 or C57 plug that make them sound like they are hunting at idle and cruise? You wouldn't be mapping too rich to save fitting good spark plugs and ignition systems obviously... LOL

The interesting thing I note from all the mappers on this topic talking about the engine likes this AFR, and it dislikes that AFR, etc, is that nobody has mentioned they adjust the fuelling tables and then the spark lead tables?

You guys do know the combustion initiation and burn speed at 13:1 is different to 14.x and 15.x:1 don't you? You cant just dial fuel in and say.. "Ah, thats better" what you probably did, was correct an incorrect advance map by changing the burn speed to something more suited to your spark map so of course it sounds better.

I am sure the missing spark advance discussion was just an oversight of course...

Stu @ M Developments

iTrader: (12)

Stu @ M Developments

iTrader: (12)

Another interesting consideration of course is most cars we all professionally tune nowadays have catalysts fitted. What do you do about those if you cant get them to run properly at stoich? You dont send them out destroying their cats do you?

Raj_FRST

sorry to hijack but stu any news on my trader status matey?

sorry to pester but no one has let me know what is going on you see

Stu @ M Developments

iTrader: (12)

Yes they have mate, I personally E-Mailed you yesterday morning asking for some info and you hadnt replied by the time I went home at 7pm so I couldnt activate your account.

I will be attacking IB E-Mails as of 12pm today so if you replied last night / today it will soon be all sorted, I will do yours first pal.

1223456

Many thanks Stu & Mark for sorting this out.

Back to topic what is:
transient fuelling
cruise fuelling

I have an idea but just want to confirm

johnny99

What kit do you use Jimbo

John

J1mbo

iTrader: (1)

My understanding is when the rpms raise the effects are less predominate. So at 3-4k it wont affect it like lairy cams do at idle