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Old 09-12-2007, 06:58 PM   #1
caseball2051
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Default switchin from 3.5 to 3.4

i get 0 kr with the 3.5 pulley with folllowing mods

FWI
autolites
180 tstat

safe to switch to 3.4?
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Old 09-12-2007, 09:12 PM   #2
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not without a scanner that can read the Knock Retard.
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Old 09-12-2007, 09:21 PM   #3
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got one.

but i dont want to waste my money, get KR, and have a pulley i wont use. thast why im asking
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Old 09-12-2007, 09:25 PM   #4
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3.4 is in the grey area, some can and some can't which is why you need to keep an eye on KR when you try it.

Have you any other mods? Ported Exhaust manifolds, Rockers...?
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Old 09-12-2007, 09:30 PM   #5
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nope.

only the ones listed.
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Old 09-12-2007, 09:40 PM   #6
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What timing do you run right now at WOT at the top of 1st and second? What KR do you run at the top of 2nd and bottom of 3rd?

If your timing stays around 15* and your KR is around 0, You are safe to drop down. If not, fix the other issues before dropping down

I could run a 3.4 with no problem on my 98, 3.3 with minimal KR. However on my 2000, It does not like the 3.4 at all.
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Old 09-13-2007, 12:50 AM   #7
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If you have 0 KR with the 3.5" I would say it is safe to drop to a 3.4" . Keep scanning though, you didn't mention which plugs you are using but I'lm guessing they are 1 heat range colder.

Ed
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Old 09-13-2007, 12:52 AM   #8
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It goes without saying that you'll run PREMIUM fuel only (91 octane minimum, 92 or 93 preferred), you'll keep watching that KR number, ESPECIALLY on hot/humid days.

Scanning for KR on a cool day or even an 80 degree day is pointless. Hot days can kill you.
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Old 09-13-2007, 01:24 AM   #9
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they are 104s, 1 range colder i believe.

i always run 93 octane, everytime.
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Old 09-13-2007, 07:36 AM   #10
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Quote:
Originally Posted by caseball2051
they are 104s, 1 range colder i believe.

i always run 93 octane, everytime.
605s are one heat range colder I believe, 104s are 2 heat ranges colder. I run 104s with a 3.4 with no problems.
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