4691Re: [bmw e28] '88 528e detonation
- Aug 31, 2006I thought it was higher octane fuel that was quicker
to burn or detonate.
--- mort_batchelder <mort_batchelder@...> wrote:
> Hi, I have a 1988 528e which I have installed an "i"__________________________________________________
> camshaft and
> valve springs in along with a computer out of a
> newer 525i. During
> the colder months it ran great but this summer it
> has had some
> detonation issues (spark knock whatever you want to
> call it) that
> starts at about 3000 rpms. Even with 92/93 octane
> fuel it will do
> it but that does help some.
> I am looking for some opinions on what you think
> might be causing
> it. I am thinking along the lines of a lean
> condition. The
> injectors are stock 528e so they may be unable to
> deliver the fuel
> necessary for higher rpm operation with the "i" cam.
> Along with the
> cam etc. I have installed new plugs and ignition
> components so they
> should be ok.
> If anyone has some ideas I would appreciate it. The
> rear-end just
> went south on me so I am getting a 5-speed
> conversion done along
> with 3.25 gearing so that should pep it up quite a
> bit. I want it
> to be able to rev freely at that point!
> 1988 528e super eta w/ 186,000 mi
> Auto - soon to be 5-speed
> Bilstiens, H&R springs, M5-spec sway bars
> "i" cam and head
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