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how lean of an afr can i go??

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11 replies to this topic

#1
edrag

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hey was just wondering how lean I can go on my vr4 4g63t powerd cordia its at 11.5 now but I want 12.0 on boost but I have been told this is to lean on boost? how far can I realy go. its a fresh forgie motor only done 1000ks now



#2
EV0300

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I think under 12 in wot is ideal but aslong as your not pinging or have early det you could go as high as the engine allows I would assume

#3
nigel_a

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i have mine set to 12. seen a few tuners do cars the same.



#4
caged

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Why? The power increase will be fuck all. Run it in the low to mid 11s on pump 98. Into the 12s on e85.
4g63 GSR.

#5
croket

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Shit im down to 10.4 on 1.2 bar boost 



#6
evo-gsr

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Thats rich ^ 


[qoute name="BMGTZ" post="331212" timestamp="1467451744"]I don't know anything ...
Trust in the master of taxis.... He will set you straight[/quote]

#7
jack be nimble

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Shit im down to 10.4 on 1.2 bar boost

Im the same. Fat as. But now my boost seems to be under control (and ive checked base timing) I can start chipping away. Till it pops.
4g93t jumbuck conversion. PRANGED 18/3/12, CHECK MY MEMBER RIDES Page 11. no serious human injuries.
ON THE ENGINE STAND. g4cs 2.4l + Gt35r. PLUS: auto conversion + Awd coming.
thanks for parts and help: BMGTZ, EVOCPE, cwolf, Benozi, Jamo-GSR, 1JUM2NV, RXVII..much appreciated, cheers guys.
Aerodynamics are for people who can't build engines. —Enzo Ferrari
REMEMBER: you cant polish a turd, but you can roll it in glitter.

#8
croket

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My problem is once i breach 1.3 or more i start to max injectors and dip into the mid to high 12s from 6000rpm onwards !!!! Think i might try bumping my fuel pressure a wee bit and see if i can get to 1.5 saftley while logging it also for knock



#9
EV0300

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^ 1 solution for that, bigger injectors



#10
evo-gsr

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Which are in my for sale thread! ^ 


[qoute name="BMGTZ" post="331212" timestamp="1467451744"]I don't know anything ...
Trust in the master of taxis.... He will set you straight[/quote]

#11
jack be nimble

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There is some bosch 1000 for sale on here for good price. Not sure if they are pnp or not. And of course jamo has some.
I got some bnib fic 1150s. Yay...

Is it injectors or pump? Maybe rewire the pump.

Edited by jack of all, 09 February 2014 - 08:22 AM.

4g93t jumbuck conversion. PRANGED 18/3/12, CHECK MY MEMBER RIDES Page 11. no serious human injuries.
ON THE ENGINE STAND. g4cs 2.4l + Gt35r. PLUS: auto conversion + Awd coming.
thanks for parts and help: BMGTZ, EVOCPE, cwolf, Benozi, Jamo-GSR, 1JUM2NV, RXVII..much appreciated, cheers guys.
Aerodynamics are for people who can't build engines. —Enzo Ferrari
REMEMBER: you cant polish a turd, but you can roll it in glitter.

#12
croket

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pump is rewired 255 waly , im just getting to much air flow up top when the 272s really kick in , i know im i need of bigger injectors but pouring all efforts into mine and glens gsr galant at the moment . 

 Ive backed my boost dow to 1 bar but it feels so slow !!! I hate turbo cars always feeling the need for more power hahahaha




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