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 Scanning vs. Engine Reliability

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Mr.Riviera
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PostSubject: Scanning vs. Engine Reliability   Wed Feb 14, 2007 2:47 pm

From: http://rivperformance.editboard.com/Other-Stuff-c3/For-Sale-f22/1998-buick-riviera-Black-on-Chrome-for-s-p1743.htm#1743

i've got 125k and i drive HARD in the city. i know mine will not last as long as some others b/c i dont scan as much as i should. but i am willing to put in another engine once this one dies (way cheaper than a new car)

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1996 with 244k miles, L324" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs.
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PostSubject: Re: Scanning vs. Engine Reliability   Fri Feb 16, 2007 6:10 pm

quote: "i know mine will not last as long as some others b/c i dont scan as much as i should."

I don't think you should worry that much. If you've scanned with your current set up, you know when your car knocks, and you know approx how much. Now you either fix the problem, or you drive appropriately. Our engines are very resiliant to moderate levels of knock. You have to push the envelope pretty often to do any damage.

Scanning often doesn't qualify as reg maintanence, imo. It isn't like giving your engine vitamins. You scan when you're testing new mods, tuning, changing variables such as gas, air temps, driving style, etc. If everything looked good last year, and it still looks good this year, there's no reason to think your engine is any worse off.

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'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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Mr.Riviera
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PostSubject: Re: Scanning vs. Engine Reliability   Fri Feb 16, 2007 6:30 pm

tru but the temp changes so often its impossible to run 0 KR

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1996 with 244k miles, L324" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs.
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PostSubject: Re: Scanning vs. Engine Reliability   Fri Feb 16, 2007 6:49 pm

Zero is optimum, but very few cars (even stock) run with zero KR all the time. Only by tuning can you achieve that. 2-3 at WOT isn't the end of the world. Even brief spikes of 3-5 don't worry me too much. After all, KR is the PCM's response to knock. It tells you the computer is aware, and is doing its best to fix the problem.

It's those prolonged periods of 5 KR, or spikes of 8 or so that cause me concern. Some diehards will disagree, saying always zero all the time, but knock is a normal thing that happens in our engines, hopefully at low levels and only under extreme load. The reason it's good to shoot for zero KR is so when the temp changes, you'll have a buffer and don't have to worry. Maybe scan on a very hot day this summer and see where you stand? Your problem could be smaller than you think.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
 
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