Jump to content
SAU Community

Recommended Posts

hey gurls n gurls, i need sum help

i put my car on the dyno about 4 months ago at unigroup. it made 181.5 kw as seen by the printout. as you can see, the afr remains at 14 until 5500 rpm and then drops to 13 by 6000rpm and then to 12 by 6500 and onwards. Back then i had cat back exhuast, pod, front mount and close to 1 bar of boost.

Now i have a split dump/front pipe, high flow cat, fuel pump. last week i installed a power fc and got it tuned by hit man. As you can see it only made 175 kws? i was like wtf? he reckons sumthings really faarked cos it shud be closer to 190-200rwks. he recons maybe my cats melted cos my pump died and i was running really lean, however if u look at my afr now theyre really low...max is 12.5 but it drops away significantly.

i dunno, do u think i shud increase my afr to what it was before. cos even though it was 14, it dropped to 12 on high load and im thinking maybe thats safe?

newways my power is low and boost comes on slowly sumtimes, yet mid-range is now better? on low throttle, if i hold it at a certain point, i get this slight detontation. i dunno, any suggestions?

both graphs are there

cheers, anton

post-29367-1161416292.jpg

post-29367-1161416442.jpg

Link to comment
https://www.sau.com.au/forums/topic/139647-lack-of-power/
Share on other sites

the closer you get to 10:1 afr, the safer it gets

the reason it may have become richer is because of the extra airflow caused by the dump and cat, combined with the added fuel flow of the aftermarket pump.

What you get is a richer mixture causing less power (cos before you were lean)

someone please explain this better than me...

Link to comment
https://www.sau.com.au/forums/topic/139647-lack-of-power/#findComment-2602936
Share on other sites

just noticed your intake temp was 54 degrees. that may have something to do with it.

also i'd say your tune isn't the best. the graph is a bit crappy, but that could also be due to the fact you are losing quite a bit of boost.

and if it was run in 4th gear, they are backing off at about 6000rpm.

Link to comment
https://www.sau.com.au/forums/topic/139647-lack-of-power/#findComment-2603024
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Wife wanted basket things in the wardrobe in our temporary house. Thought about ripping our the wardrobe and fitting the entire IKEA set, but it's a temporary house and we want to move in a few years. So IKEA advertises this as a 50cm unit, however the actually basket and rails measure 46cm wide. Only issue was depth, IKEA stuff is quite deep, where as the builder special junk is super shallow at less than 40cm. Send it, chopped the rails, then offset the mounting holes, job done, happy wife, less shit scattered all over the bedroom. Did the same to the other side too. Also drove the Skyline shit box today, dropped off oil at Supercheap Auto. I didn't realise they only now take max 2x bottles per visit. I visited 2x Supercheap Autos.  
    • I've seen similar actually in my situation. You never know what tables are attempted to be used when the car thinks it's -99C or +200C. The fail state is not usually that extreme but you know what I mean - it was in my case though! This is where being able to read all the sensors is useful cause you see this stuff really quickly.
    • The above is very important. However as long as you keep timing relatively low, it's plausible to make your own knock ears and plausible to learn to tune with a modern ECU that can do wideband O2 correction like a boost controller. I mean if you only have one viable road to even drive the car on, learning to tinker to this level may be worth doing given you can't do much else with the car...?
    • I find the fact that the rear plate has to be bent inwards at the rear not so bad: but the front is just awful: It's like come on. (these are my very old, now retired/turned in plates) TBH it is a lot of money to fix a minor issue, the fact I said "I'll never really spend the money on doing this" is why people ended up buying them as a gift for a 'car guy' who can be hard to shop for.. for car guy things.
    • I just bent the ends of my premo plates. It even went through Regency like that after the engine conversion and the inspector (a great bloke!) just squinted his eyes and said "I didn't see that". Plates, and how they look, are just something that have zero importance to me.
×
×
  • Create New...