demetaktak

hi.

just had my car put on dyno and the AFR reading was pretty low. it showed 10.6

has anyone had experence with this? should i raise it to 12-12.5 as advised?
i am told that i will get 40-50 rwhp more if i do that. how will it affect my supercharger and engine life and durability. what about fuel consumption.

the car is completely stock with only ECU remap and it showed 465 hp TO THE WHEELS. 584 in the engine. weird. would be great if i could go over 500rwhp with the AFR fix.

thanks in advance.

MindBend

Should be mid 11's.
12's is too lean.
10.6 is too rich.
However, if you're intake temps are too high (need to be verified) it may be dumping fuel to cool things off.

Hulk

^^ this

MindBend

One other point of note: if your tuner is relying on a wide-band stuffed up the tailpipe, find another tuner. Especially if you're tuning close to the edge. It's not reliable enough since there's too many variables that far downstream.

Hulk

Not everyone has data logging SW or even afr gauge so the tailpipe sniffer is all they can rely on

jmb614

True, but if you're going to be tuning and/or modifying the car it doesn't cost much to have a bung welded in so a dyno shop can throw their wideband sensor in for the session, plug it up afterwards.

Hulk

I agree, I actually think as soon as you tune you should be data logging, something I learned early on from chasing ghosts and I recommend the dashdaq and zt2 to everyone before they spend money on mods.

jmb614

^^ +1

sircl55amg

10.5 to 12.5 is safe ---- mid 11 is perfect ... many factor affect afr

Hulk

For pump gas it's mid 11 for race gas it's in the 12s

MindBend

If you're tuning, short-cuts and "good-enoughs" are prime ingredients to future heartache.
Agree with sircl55, a lot of caveats: intake temp, fuel quality/octane, plugs, etc.

If you are tuning for 12.x AFRs, the margins become thinner. (no dice on tailpipe sniffer, etc.)

demetaktak

thanks guys.
unfortunately down here i have very limited choice in everything. this actually is the only dyno in the country.
at the very least i ll have a map written for leaner AFR and plug it in. if does better i ll keep it, if it doesnt, i have the current map saved.
another question. i showed 460 rwhp and 585 bhp. are these numbers normal for just a ECU remap?
we couldnt measure torque due to wheel spin on the dyno. so theoreticaly if 469 bhp comes with 700Nm, then 585 bhp then proportionally i should get somewhere near 870Nm. how accurate is my calculation. what else should i keep in mind.

cheers.

Hulk

Are they measuring crank hp or whp? For just a tune those numbers are high

demetaktak

460 wheel hp. crank was calculated by the comp at 585.
i had everything checked. pulleys, IC, headers. all stock

EREBUS

son, that's strong

MindBend

Oh, boy....here comes the corrected:uncorrected debate again.
[unsubscribe]

Hulk

What kind of dyno was this? Those numbers do not look like tune only, corrected or not lol

demetaktak

its really weird how thats possible.
had a run against a fully modded cls55, headers, throtle body, pulleys, big aftermarket intercooler making bout 500 whp. ran it over
135 bmw with 470 bhp 760 nm. ran that over. u can see the vids here:
https://www.youtube.com/channel/UCrB...4QsD9vf0phqviA
my fav is the e60 m5 MT Dinan 580 bhp

Hulk

The air in Georgia (the country) must be filled with NOS lol

sircl55amg

forget about the whp !!! go to the track and bring some trap speed and ET 'S ... !!!

99lightning

and try not to spin the ***** off the thing

demetaktak

there is a drag race end of sept. i ll get my quarter mile times then. how much time do you think an LSD can save me in quarter mile? approximately.
i had everything checked on the car, the suercharger is blowing 0,75 bar (stock), headers look stock, so does throttle body, intercooler hasnt been touched. wht else could give me thi much power? the only thing changed is the IC pump, its Bosch 010, which is not the best choice, but more economcal.

Crissus

In germany we would say clearly "Presselader". Which means Supercharger for the press.
Thats the Supercharger with a higher gear ratio internal so it makes approx 0.1bar more boost than the stock units. I Heard now that it was more or less a common tuning upgrade for the early 55Ks before they all went with pulleys.
Those were the supercharger units they used when they went at nardo italy racetrack with the SL55 in 2002 and killed that Lambo Murcialago up to above 320kph top speed.

Hulk

Deme talk, that's pretty much stock boost

demetaktak

had another run at the M% dinan 585 hp. rolling start from 60 to about 280-290 until it got boring
https://www.facebook.com/photo.php?v...type=2&theater
here is the vid.