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Author Topic: Knock questions  (Read 7989 times)

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Offline Be4u

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Knock questions
« on: February 22 2007, 05:20:38 PM »
My chip is for 93 oct 20*/18* 15-17 psi. No alky. (not hooked up)

Fuel pressure is 44#

At 3/4 throttle I get 1 degree of knock and it slowly goes up. I gotta lift.

What do you think my problem is? Intercooler is a 15 row stretch stock location.

Wideband at cruise & idle is 14.00 - 15.00. Shouldnt it be lower with Erics chip?

Stock maf too.
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Offline Recklessrob

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Re: Knock questions
« Reply #1 on: February 22 2007, 06:40:07 PM »
Your WB is near Stoichiometric ratio (14.7 : 1) Generally
most cars idle better when they're a little richer than that.
What does it read @ 3/4 throttle and higher when the knock is occuring ?
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Offline Be4u

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Knock questions
« Reply #2 on: February 22 2007, 06:59:27 PM »
I believe the car idles at 14.7.

I'm going to email Eric and see what he says about idling lower. I swear it should be high 12...I'm probably wrong though.

I'll have to get back to you on the reading at 3/4 throttle. I was too worried about watching to see if the knock goes up to even think about anyhting else. Might take me a week to let you know. lol
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Offline kma697

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Re: Knock questions
« Reply #3 on: February 22 2007, 07:21:48 PM »
Stoichiometric ratio??? Damn those big words scare me off...I better get a dik-shun-ary!!  That is how you spell it right??? :rofl;   I didn't realize we had so many scholars here...I'm impressed.
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Offline Recklessrob

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Re: Knock questions
« Reply #4 on: February 22 2007, 07:30:54 PM »
You're no slouch either. :supz:
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Offline Ttype83

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Re: Knock questions
« Reply #5 on: February 23 2007, 12:07:30 PM »
When was the last time you did a spring cleaning?
Check turbo to IC hose for oil.
You need a logging program to record it while it's happening.
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Jim Seaton 83 T type
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Offline Be4u

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Knock questions
« Reply #6 on: February 23 2007, 01:21:38 PM »
Bout 7K miles ago.

I'll check the hose today.

I need to find a direct scan pretty soon. The weathers getting warmer and I'm starting to get the itch.
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Offline Ttype83

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Re: Knock questions
« Reply #7 on: February 23 2007, 03:29:16 PM »
If you are going DS, I would look at the new powerlogger instead.
I was thinking of the free ones  :D cheap laptop and cable...
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Jim Seaton 83 T type
CarbedHotAir Slug
2 1/2\" mandrel bent dual exh wo/cat & Dynomax race bullet mufflers, MSD coil, MSD BTM,K&N filter, K hanger, CS secondaries, Comp cam 260H, BRF Trans, ET 14.8 @ 92mph 14 psi boost
Comp Cams will never get another dime of my money
USAF (retired w/22yrs)
86 T-type Stock IC & Turbo, Razor Alky, 50lb inj, Hotwire & fuel pump, tt chip

Offline Be4u

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Knock questions
« Reply #8 on: February 23 2007, 06:29:16 PM »
Jim, tell me more!
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Offline Ttype83

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Re: Knock questions
« Reply #9 on: February 23 2007, 06:43:49 PM »
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Jim Seaton 83 T type
CarbedHotAir Slug
2 1/2\" mandrel bent dual exh wo/cat & Dynomax race bullet mufflers, MSD coil, MSD BTM,K&N filter, K hanger, CS secondaries, Comp cam 260H, BRF Trans, ET 14.8 @ 92mph 14 psi boost
Comp Cams will never get another dime of my money
USAF (retired w/22yrs)
86 T-type Stock IC & Turbo, Razor Alky, 50lb inj, Hotwire & fuel pump, tt chip

Offline 87natty

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Knock questions
« Reply #10 on: February 23 2007, 07:32:33 PM »
I second Jimbo.
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Offline Wrecked Em

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Re: Knock questions
« Reply #11 on: February 23 2007, 09:36:05 PM »
What injectors are you running?

I would drop the fuel pressure and see how it responds.

You need some type of scan tool! :smt071
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Offline Recklessrob

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Re: Knock questions
« Reply #12 on: February 24 2007, 02:08:35 AM »
Quote from: "Wrecked Em @ Fri Feb 23, 2007 9:36 pm"
What injectors are you running?

I would drop the fuel pressure and see how it responds.

You need some type of scan tool! :smt071


Don't drop the pressure yet, you may be too lean. Get some data man.
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Offline Be4u

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Knock questions
« Reply #13 on: February 24 2007, 04:51:31 AM »
Ok, sooner than I expected I tested the 3/4 throttle wb reading.

With 60# injectors the wb hit 12.xx - 11.xx with about 3* of knock at about 65 mph. See my sig for engine details. The boost was probably at aroung 12-14#'s.

I have a scanmaster and WB.


Jim, I never checked my IC to turbo hose. Busy all day. I'm about to check your links. Thanks!
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Offline Top Speed

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Knock questions
« Reply #14 on: February 24 2007, 09:01:16 AM »
I would start a bit richer like around 11.5-11.7:1.

It should not knock with that timing at that boost, but every car is different.
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