[mkiv] tuning for road racing

Tue Oct 23 06:54:26 CDT 2007

The AEM ECU comes with the correct crimp connections for attaching new
sensors.  If you take a look in the FSM you'll see a description of the tool
to remove the pins from the ECU harness.  After removing the stock wiring
for that pin location you can insert your newly crimped sensor wire for a
nice installation.

Shawn

On 10/22/07, Supraice <supraice at fcengr.com> wrote:
>
> 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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> >
>
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