[mkiv] tuning for road racing

[Supraice]

Marshall;

How are you?  That looks like a great product.  I am reading temps at the oil filter bolt.  Running
1.5 bar tops.  But my car seems to have better temps at 1.5 than 1.2.  I got to data log all of this
Shi... to really understand what is happening.  BTW, I'm sponsor by Royal Purple and they have
analyzed the oil after running it to 315F, they say "no break down and no glazing expected on
mechanical parts".  That means the oil is hot but its still ok.  Now remember that was my peak, I
hit that near when the checker came up.  My EGTS do not go to 870 on a long straight as I am on WOT
through out any straight road, it appears to jump on turns.  I spoke to barichi this weekend and he
mentioned that he saw fuel starvation and "leaning" in his car at one-lap while turning and holding
less than 1/2 a tank.  I have a fuel cell with a surge tank so I cannot believe that would be the
problem.  I believe that fuel starvation will produce hasitation, not leaning.  In any case I think
that speculating is not usefull as I am close to getting the car back on the track for data logging.
I'll make sure I post when it get the data.

Has anyone here use an AEM EGT sensor?  How in the heck can you connect that sensor if the stock
hardness does not even use that spot suggested by AEM.  I think it is B04 for EGT#1.  Whichever it
is I checked out this weekend and it is actually plugged?? Not sure how to get a clean installation
if it cannot go through the stock connector to the ECU??

I would welcome a visit and can give you a free invite to MSR on member days if you help me tune
when you are here ... :-)

Thanks for the advice,
Ivan

-----Original Message-----
From: mkiv-bounces at mkiv.com [mailto:mkiv-bounces at mkiv.com] On Behalf Of Marshall Morgan
Sent: Saturday, October 20, 2007 7:37 PM
To: The MKIV.com National Mailing List
Subject: Re: [mkiv] tuning for road racing

How much boost are you running?  Where is the oil temp sensor as those temps 
seem high to me (chasing that right now on my track car) - sensor in the 
pan, on the side with steady peaks of 295F.  I've been looking at logging 
for awhile and after having one of my gauges light up on my passenger side 
and both my passenger and I not noticing, I've pulled the trigged on a 
Aimsport Pista MXL dash last week.  Check it out here: 
http://www.aimsports.com/auto/index.html - works nicely with Motec, 
Autronic, AEM EMS, etc.  They use K type for EGT and cylinder head. I am 
putting an oil temp sensor on the output/oil filter location to get a 
differential of oil temps - just too scary to me to see 300F! PS: The dash 
is smaller in real life than in the pictures but it's going to be cool!

I personally think the AFR's are a little too rich - I would shoot for 
11.0-11.2 under WOT.  How can the EGT's be 710-750 at WOT "lap after lap" 
and on long straight be 870?  You definitely want the least amount of timing 
to make the specific power output you can on the lowest boost pressure you 
can - so more timing with less boost other than more boost with less 
timing - boost is more directly related to overall engine temps (air, water, 
oil, etc).  If anything, I think I would either retard the timing or run a 
little rich but not both to get the most efficient use of heat.

PS:  When is the next two day event in TX - I need to come back out there!

- Marshall / 98T / 94T / http://www.dudefish.com / http://www.boosttoys.com
       Check out the SF alternative - http://www.mkivforums.com

----- Original Message ----- 
From: "Supraice" <supraice at fcengr.com>
To: "'The MKIV.com National Mailing List'" <mkiv at mkiv.com>
Sent: Thursday, October 18, 2007 1:36 AM
Subject: [mkiv] tuning for road racing


> Basic set up is 67mm turbo, cast manifold, AEM.  I have an EGT two inches 
> down from the turbo.
>
> Symptoms:  While at the track I can only look at gauges when on the 
> straights.  On the straights I
> am off course at WOT.  AFR : 10.5, EGT : 710-750 C lap after lap.  I'm 
> cool with that but.  On the
> long straight I hit peak hold and it shows 870C !!! ouch!  Down from the 
> turbo??  I should have melt
> down by now.
>
> Question:  My tuner tells me that he retarded timing as I told him to keep 
> head and pistons as cool
> as possible as supras have plenty of power.  I read up on it and retard 
> brings the spark closer to
> TDC which moves the heat out of the head which is what I want but that 
> will increase EGTs.  He told
> me to ignore EGTs as my head will be cool with the high fuel and retarded 
> timing although EGTs
> "appear high".  It really sounds correct but wanted some opinions. 
> Coolant temp is normal (sorry
> only have the stock gauge), Oil will peak at 300F and hold there on 95F 
> weather.
>
> Actions I'm taking: adding AEM EGT so I can data log against other 
> variables and determine when the
> peak EGT is happening.  The AEM EGT has been mounted 1 inch away from the 
> Greddy EGT so I can
> compare there out put as I also been told that Greddys do produce "ghost" 
> reading.  May intall a
> head temp gauge, where do you guys recommend?
>
> TIA for all opinions,
> Ivan
>
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> Mkiv at mkiv.com
> http://www.mkiv.com/mailman/listinfo/mkiv
> 

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