Ignition retard knock sensor.

[Charles Brooks]

What type of ignition and what Compression are you running? If you're running a relatively high compression ratio you may have to live with premium fuel. Adding an intercooler will reduce charge temps and help with the knock problem. If you have an MSD ignition I would suggest purchasing the MSD BTM (Boost Timing Master) module. The BTM retards timing as boost comes on. I'm in the planning stages of Turbocharging a small block Chevy. Actually I'm $1500 inot the planning stage :) I have the manifolds, turbo, wastegate, oil lines, and various little stuff. I just have to convince my wife that it's an excuse to buy a beater now!

Contact me off list if ya like, I'd be glad to share any info I have found or might have.

Charles Brooks

---------- Original Message ----------------------------------
From: Daniel Houlton <houlster at user2.inficad.com>
Reply-To: diy_efi at efi332.eng.ohio-state.edu
Date: Tue, 25 May 1999 18:43:25 -0700 (MST)

>C. Brooks wrote:
> 
> Has the engine always knocked, or did it begin recently?
> 
> Charles Brooks

Nope.  Mysteriously, it started after I added the turbo :)  I have other
things I need to fix like getting an intercooler installed and getting a
cold air induction system set up that will help a lot, but I don't know
how long that'll take me and I'm still concerned that it won't eliminate
the knock.

I've set the timing back to stock from having it advanced a bit pre-
turbo and that helped.  Also, I'm running water injection but want to
eliminate that as well.  I recently made a round trip of about 9 hours
each way (a few days apart).  Loaded down with a roof rack, camping
supplies, tools and spare parts (and a dog) and I was running a constant 5
psi of boost at 65 - 70 mph and 8 psi on the big hills.  Water tank ran
dry in the first 30 - 45 minutes.

Knock isn't so bad on premium, but I'd like to run mid (or even low)
octane fuel without a problem.


--Dan
houlster at inficad.com
http://www.inficad.com/~houlster/amigo.htm