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Old 11-02-2001, 12:43 AM   #1
impRSa01
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Member#: 4411
Join Date: Feb 2001
Location: Appleton, WI
Vehicle:
2001 Impreza 2.5 RS
Black

Default New spark plugs or keep old ones?

I am getting a stage 1 kit. The kit comes with a T25 BB turbo, specked out to flow more than a T3 but a little less than a T3/04. So I would say it's efficiency range is maybe 12-15psi. My kit is non-intercooled, and is going to be running 5psi.

Do you think I should upgrade my spark plugs to 2 stages colder or so. I want to prevent detonation, and I know since I am not benefiting from an intercooler, I should try and prevent it with 94 octane gas and colder plugs. So which plugs should I get?

The reason I am not getting an intercooler at this time is so I can have more gauges to monitor the engine. If i got the intercooler, I could only get EGT and boost. Without the intercooler, I would have plenty to spend on EGT, fuel pressure gauge, and a boost gauge. Which route is better? Keep in mind, I am taking my car through the winter right now, so hot outside temperatures are non-existent to induce detonation. I can always save up in the winter for an intercooler to go on in the summer.

Let me know what you guys think.

Kevin
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Old 11-02-2001, 01:11 AM   #2
paulnose
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Join Date: Feb 2001
Location: Fairfield County, CT
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Silverthorn

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My 2 cents is get the intercooler and you wont have to worry about the gauges, Running without an intercooler is okay, but I wouldn't consider it the best of all ideas, since we have high compression engines. The non-intercooled subies are mostly 8.5:1 from what i've seen, a big difference from 10:1
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Old 11-02-2001, 02:10 AM   #3
Eric SS
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Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2013 335i, 2011 G37 coupe
Vehicle:
2000 2.5RS w/ EJ22T
swap and N20. gone. : (

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Definetly go with an IC. I'm one of the many casualties who said I'll hold off on the IC. And definetly get colder plugs. NGK 7's

Eric
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Old 11-02-2001, 02:51 AM   #4
HndaTch627
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Location: Carol Stream, IL
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'01 GC8 Dinged STM
'09 Concours 14 ABS Black

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i would definitely get an intercooler and run 2 stage colder plugs regardless. You don't want pinging.

Jeremy
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Old 11-02-2001, 12:13 PM   #5
STiShawn
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Location: St.Louis
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2006 WRX TR
Steel Grey Metallic

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You not only should have colder plugs, but DEFINETLY get an IC. or run 3psi or under. Larry Ganz is in the process of developing and having produced great IC's. I will post pictures and a review when it is done. Look into Ludespeed, Forced Air technologies, Vishnu, KartBoy or others for an IC if you need it asap....
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Old 11-02-2001, 09:47 PM   #6
the Dabbler
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MY00 2.5RS Sedan
Abnormally Aspirated

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Not only are colder plugs a good idea, they're cheap, even for really good ones. If you're in there already, I figure, why not? It takes half an hour to do all four.

Re the intercooler: Personally, I'd want one. But then, if you're going with a base kit that uses an RRFPR to control fueling, then I'd want a fuel pressure gauge as well, since that would be your primary "tuning" mechanism. At least get a cheap mechanical fuel pressure gauge and tape it to the outside of your windshield during your initial testing. Maybe you could fit that into your budget and still get an IC?
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Old 11-02-2001, 11:06 PM   #7
Avenger
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Do you guys have the NGK number for the colder plugs for a 2000 2.5RS?
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Old 11-03-2001, 11:50 AM   #8
Eric SS
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Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2013 335i, 2011 G37 coupe
Vehicle:
2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Default

NGK part number BKR7E-11 I believe

Eric
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