Tuning 165 for SC - and ALUM Heads

[CSH-HQ]

>> Date:          Tue, 6 Jul 1999 16:54:58 -0500
>> To:            gmecm at efi332.eng.ohio-state.edu
>> From:          nacelp at jvlnet.com (CSH-HQ)
>> Subject:       Re: Tuning 165 for SC - and ALUM Heads
>> Reply-to:      gmecm at efi332.eng.ohio-state.edu
>
>> Had you been reading the plugs?..

>No

Look for fly sized turds of black or silver material on the center 
electrodes.  That should at least give a clue about which cylinders were 
detonating.

>> Where did/how did the gasket fail?

>Rad fluid into cyllinder, 3 consecutive hard WOT runs  on a 103 degre 
>day.

I meant where, between cylinders, or to which coolant jacket opening.

>> If ARAP, are you doing something trick, or running MAF?
>
>MAF, It is MAXXED out (255) at about 3200 rpm. O2 shows 0.89 - 0.91 
>thru the RPM's
>
>> What are you doing for reading the addition Air Flow?
>
>Not a thing at this point. Ideas? I can make a custom housing for the 
>MAF electronics section but I do not know what to bump on the ECM. 3" 
>or 3.5" MAF maybe... -OR- maybe a TWIN MAF setup.. I get the concept 
>of that but would need guidance for code changes.  - OR- should I go 
>1-bar MAP and scrap the MAF.  decisions.. I need help with all 
>avenues, whatever one I take. so far with no guidance, I'm scared to 
>strike ont and commit.

How about 2 bar (up to 14 PSI boost) MAP.  Just use the 749, since it also 
is hacked.  Or use a larger MAF and translater.  Twuns make it too conplex 
to my fible mind.
>
>> What for addition fuel (pump+injectors)?
>
>Syclone Pump, adj regulator at this point. nothing else. stock 
>injectors. If I have to run less boost I'll do that for now. The car 
>ran a 13.50 @ 103, I estimate the setup added 80-90HP to the stock 
>225. I don't know the limits of the stock injectors as far as HP 
>goes.

I'd guess 345 HP if a fll weight car.  So you might be at their limit if 
19-21s.  Specially if never been cleaned.
The SBC uses 5 head bolts per chamber so you were at a more than slight problem.

Please use a good oil/ai seperator for the PVC.
>
>> I have a strong suspicion that the stock ESC might be kinda blind at oil 
>> enduced detonation, at higher RPM then when the ESC is tuned for.  A vary 
>> slight amount from the blower, might be the oil source, don't take much at 
>> higher rpm.  
>
>SC unit had a self contained resevoir and has not dropped level in 4k 
>miles. I DO get knock with anything other than sunoco 94.
>
>> I'd think twice about running a syclone calibration.  That way you can go 
>> way retarded with the timing at any "over boost".  
>
>Okay.. I'll try to find out thru archives what I need to do to the 
>wiring etc to accomplish that... than back with more Q's..
>
>THANKS!
>
>> Bruce
>> >Just an update - and any comments would be great.
>> >
>> >I had JUST gotten the knock outta the cal by tweaking some main spark 
>> >values, and was satisfied with the "base" changes I had made (spark 
>> >mods only) when POOF - a head gasket goes out. (125k miles). I had 
>> >not even the chance to start addressing the fuel changes for the SC 
>> >addition and now I gotta think about changes to help idle and changes 
>> >to accomodate/ take advantage of  the larger 200cc intake runners, 
>> >and the effect that the aluminum heads will have on the whole thing. 
>> >I am using GME (GREAT TOOL!) to tweak the thing and am open to being 
>> >taught what areas I should address first. tips, techniques etc.. 
>> >anything. the car is an 89 IROC 5.7L, if you missed the last post a 
>> >month ago. ARAP bin, 165 ecm, (SC = Supercharger, 6 PSI max)
>> >Dave Z. www.delanet.com/~tgp
>> >
>> 
>> 
>> 
>Dave Z. www.delanet.com/~tgp
>