 hotter plugs?, new motor help |
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 Sep 17, 2008 - 9:13 PM
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Enthusiast  Joined Dec 24, '06 From jonesville Currently Offline Reputation: 4 (100%)  |
ok...so i just put a new motor in my car....it feels like its running ok but it just doesnt have the power it used to...and this motor has had some stuff done to it...but i put a step hotter spark plugs in it....is that my prob? should i lean it out a little more than normal w/ these plugs? it seems to b running very rich now? thanx.
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Sep 17, 2008 - 9:16 PM
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Enthusiast Joined Mar 11, '06 From Way South Chicago Currently Offline Reputation: 0 (0%) |
what do you have, what have you done?
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Sep 17, 2008 - 9:27 PM
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Enthusiast Joined Dec 24, '06 From jonesville Currently Offline Reputation: 4 (100%) |
QUOTE (Bitter @ Sep 18, 2008 - 3:16 AM)  what do you have, what have you done? just been rebuilt... Head: Port and polish 3angle valve job and its been decked and the block has been bored .040 it has ~10.5- 11-1 compression. besides that...everything is just new... i have an SAFC to tune w/ but i wouldnt think id have to do much tuning for it to run good? right? |
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Sep 17, 2008 - 11:00 PM
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 Enthusiast Joined Apr 15, '07 From Fort Worth, TX Currently Offline Reputation: 12 (100%) |
QUOTE (Kerr1 @ Sep 17, 2008 - 9:27 PM) QUOTE (Bitter @ Sep 18, 2008 - 3:16 AM) what do you have, what have you done? just been rebuilt... Head: Port and polish 3angle valve job and its been decked and the block has been bored .040 it has ~10.5- 11-1 compression. besides that...everything is just new... i have an SAFC to tune w/ but i wouldnt think id have to do much tuning for it to run good? right? Tuning it will make a difference, but you will have to buy a wideband to get the right AFR throughout the power band. -Matt |
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Sep 18, 2008 - 9:59 AM
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Enthusiast Joined Dec 24, '06 From jonesville Currently Offline Reputation: 4 (100%) |
QUOTE (GotToyota @ Sep 18, 2008 - 4:00 AM) QUOTE (Kerr1 @ Sep 17, 2008 - 9:27 PM) QUOTE (Bitter @ Sep 18, 2008 - 3:16 AM) what do you have, what have you done? just been rebuilt... Head: Port and polish 3angle valve job and its been decked and the block has been bored .040 it has ~10.5- 11-1 compression. besides that...everything is just new... i have an SAFC to tune w/ but i wouldnt think id have to do much tuning for it to run good? right? Tuning it will make a difference, but you will have to buy a wideband to get the right AFR throughout the power band. -Matt so u dnt think the plugs r my problem? jus needs to b tuned. |
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Sep 18, 2008 - 10:07 AM
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Enthusiast Joined Apr 15, '07 From Fort Worth, TX Currently Offline Reputation: 12 (100%) |
I would go to a dyno and get a good tune then go from there. You will also need a wideband, or some shops can provide one for tuning purposes.
-Matt |
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Sep 18, 2008 - 10:14 AM
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Enthusiast Joined Dec 24, '06 From jonesville Currently Offline Reputation: 4 (100%) |
alright...preciate tha info
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Sep 18, 2008 - 11:04 AM
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 Enthusiast Joined May 22, '03 From NOVA Currently Offline Reputation: 16 (100%) |
You put 1 step COLDER plugs in when you INCREASE HP.
and you don't need to go 1 step until you have increased ~50hp. going hotter = wrong direction This post has been edited by playr158: Sep 18, 2008 - 11:04 AM |
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Sep 18, 2008 - 12:49 PM
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Enthusiast Joined Mar 18, '08 From Staten Island, NY Currently Offline Reputation: 0 (0%) |
The same goes for putting on a turbo. You usually want to go 2 steps down if you turbo so the fuel doesn't combust prematurely.
This post has been edited by Project7afte: Sep 18, 2008 - 12:51 PM |
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Sep 18, 2008 - 10:17 PM
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Enthusiast Joined Dec 24, '06 From jonesville Currently Offline Reputation: 4 (100%) |
QUOTE (playr158 @ Sep 18, 2008 - 5:04 PM) You put 1 step COLDER plugs in when you INCREASE HP. and you don't need to go 1 step until you have increased ~50hp. going hotter = wrong direction ive always hear hotter plugs are better for N/A motors but i gues not...ill go get some stock plugs and c wat happens...thanx. This post has been edited by Kerr1: Sep 18, 2008 - 10:19 PM |
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Sep 19, 2008 - 2:48 PM
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Enthusiast Joined Dec 24, '06 From jonesville Currently Offline Reputation: 4 (100%) |
just bought stock ngk plugs runs a lot better...thanx for tha help guys.
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Sep 19, 2008 - 7:41 PM
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 Enthusiast Joined Dec 27, '03 From Nor Cal Currently Offline Reputation: 0 (0%) |
Just FYI... anytime you increase combustion chamber heat (increased comp, turbo/supercharger, etc...) you should decrease spark heat and increase octane to reduce detonation.
-------------------- "It's ok to be naked girl... I'm an artist!"
1995 AT200 Celica ST: stocked out daily driver... 1984 AE86 Corolla GT-SR5: silvertop 20V 4AGE project car jacked up with goodies... 1991 SW2x MR2 n/a: bare bones hardtop model soon to be... |
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Sep 21, 2008 - 12:33 AM
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Enthusiast Joined Dec 24, '06 From jonesville Currently Offline Reputation: 4 (100%) |
QUOTE (Kwanza26 @ Sep 20, 2008 - 1:41 AM) Just FYI... anytime you increase combustion chamber heat (increased comp, turbo/supercharger, etc...) you should decrease spark heat and increase octane to reduce detonation. yea...ive always run 93 in mine since the CR is so high from the factory...so no biggie there.but in the 5sfe it would take a LOT to make any kind of n/a power so im sure i dnt need colder plugs...preciate all the advice tho. This post has been edited by Kerr1: Sep 21, 2008 - 12:34 AM |
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Sep 21, 2008 - 6:01 AM
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Enthusiast Joined Aug 16, '03 From Bay area Currently Offline Reputation: 0 (0%) |
look at your old plugs, they will tell you if you need to run hotter or colder.
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