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chadix24_7
Occasional Poster

Location:
cebu city, philippines
Registered:
September 2004

7age pinging	Mon, 23 May 2005 10:16

MY SET-UP: 7a block with stock rods and cranks 4age smallport high compression pistons 4age smallport injectors (shorted at bypassed the resistor) 4age bigport head with t-vis enabled (MAP TYPE) 4age bigport jdm ecu ignition timing is 10 degrees grounded PROBLEM: engine seems to ping at 2,000 to 2,500rpm on first gear but will eventually disappear at 3,000rpm and up... is this normal? or there's something wrong? just finished replacing the fuel filter, cleaned the TB and air filter, bought new factory spark plugs... but the problem still persisted... thanks in advance... cheers! [Updated on: Mon, 23 May 2005 10:20] [Report message to a moderator]

Location:
Eastern Melbourne
Registered:
January 2005

Re: 7age pinging	Mon, 23 May 2005 10:38

Thats quite a set up! hows it go other than the pinging? I am havng a shot in the dark, but have you had the compression check? the bigport head is from a 1.6, th 7AFE is 1.8, from what i know, id guess it would be pretty high compression? especially with hi-comp pistons. i know that in the older motors, ie k motors, a common mod is to put a 3k 1200 head on a 4k 1300 to give it more compression, and it isnt uncommon for these engines to ping in the lower revs under heavy throttle. [Updated on: Mon, 23 May 2005 10:39] [Report message to a moderator]

Location:
Brisbane, Queensland
Registered:
January 2004

Re: 7age pinging	Mon, 23 May 2005 10:52

Hang on, your using the 4AGE MAP ECU (1.6L) on a 7AGE (1.8L) I'd be thinking its pinging cause its not getting enough fuel. [Report message to a moderator]

chadix24_7
Occasional Poster

Location:
cebu city, philippines
Registered:
September 2004

Re: 7age pinging	Mon, 23 May 2005 11:54

i'm using the 4age smallport 230cc i think injectors over the 4age bigport injectors which are 180cc i think and i shorted and bypassed the resistor. [Report message to a moderator]

4agte
Forums Junkie

Location:
Toronto, Downtown
Registered:
September 2004

Re: 7age pinging	Mon, 23 May 2005 11:57

i thinks an aftermarket ecu wouldnt hurt [Report message to a moderator]

oldcorollas
Forums Junkie

Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: 7age pinging	Mon, 23 May 2005 12:06

do a compression test. if you are getting a higher cranking pressure than you would expect for those cams, then that could be your problem (ie dynamic compression is too high). what static CR did you design for? what overlap are the cams? next put a multimeter on the oxygen sensors output and have a look.. is it going lean? (ie leaner than stoich) (or take it to someone with a wideband/dyno... if i were you i'd dyno it anyway just to make sure the mixtures are ok) you need to eliminate the issues step by step... Cya, Stewart [Report message to a moderator]

feral4mr2
Forums Junkie

Location:
Bundaberg, Qld.
Registered:
May 2002

Re: 7age pinging	Mon, 23 May 2005 12:27

had it on a dyno and had the air/fuel mixtures checked? some of the guys in the states with their 4agze's have encountered a low rpm lean out. and they use 'the grunt box'... http://www.grubinski.com/gruntbox/ [Report message to a moderator]

chadix24_7
Occasional Poster

Location:
cebu city, philippines
Registered:
September 2004

Re: 7age pinging	Tue, 24 May 2005 00:49

sad to say but a dyno shop isn't available here in our area, i searched the net and someone said that i would yield over 11:0:1 compression by using the smallport pistons. but is it really natural for high compression engines to ping at certain revs? [Updated on: Tue, 24 May 2005 00:52] [Report message to a moderator]

chadix24_7
Occasional Poster

Location:
cebu city, philippines
Registered:
September 2004

Re: 7age pinging	Tue, 24 May 2005 09:43

bump [Report message to a moderator]

feral4mr2
Forums Junkie

Location:
Bundaberg, Qld.
Registered:
May 2002

Re: 7age pinging	Tue, 24 May 2005 10:58

with your set-up i bet the poor old 4age ECU just isnt up to the task with it's stock timing air/fuel map doobies. [Report message to a moderator]

Location:
wollongong
Registered:
October 2004

Re: 7age pinging	Tue, 24 May 2005 12:30

dude, try and get ur hands on one of these ttp://www1.jaycar.com.au/productVi ew.asp?ID=KC5385 &CATID=&keywords=fuel&SPECIAL=&for m=KEYWORD&ProdCodeOnly=&Keyword1=&Keyw ord2=&pageNumber=&priceMin=&priceMax=& amp; amp;SUBCATID= works a treat, my mate and i built one for his car. [Updated on: Tue, 24 May 2005 12:32] [Report message to a moderator]

4agte
Forums Junkie

Location:
Toronto, Downtown
Registered:
September 2004

Re: 7age pinging	Tue, 24 May 2005 12:43

link aint working and i would definatley try an aftermarket ecu [Report message to a moderator]

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