[Shotimes] New +20 cam dyno results

[Donald Mallinson]

I have a guy locally that is ex-Ford, did the computer tuning on many of 
the most recent Mustangs including some work on the GT.  He does this 
and has had very good luck, I am on his waiting list, but it took so 
long to get the cams in that I am probably not going to get this done 
before the convention.

Don

Ron Porter wrote:

>Don,
>
>When you go to a higher duration/overlap cam, winding it higher is the way
>these type of cams get their power when they move the torque curve up higher
>in the rpm range.
>
>FWIW, in a discussion with the Jomar guys a few years ago, it seems the
>engines like BB Chevies have probably about maxxed out on what they can do
>with duration & overlap, and they are now going to cams with huge lifts
>(.600-.800 and higher) to get engines with much broader torque curves.
>
>If you analyze your dyno graphs, you can plot the rpm drops between gears,
>and calculate where your best shift points are to keep the power in the best
>average range through the gears. It may even show that different gears need
>different shift points. 
>
>With the advent of the newer equipment that more accurately can tune your
>engine/PCM combo, it would probably be a good idea to have it done, as
>opposed to the old "chip tuning via USPS" that was done back in the "old
>days" of the '90s!!  ;-)
>
>Ron Porter
>
>-----Original Message-----
>From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
>On Behalf Of Donald Mallinson
>Sent: Sunday, May 29, 2005 7:01 AM
>To: shotimes@autox.team.net
>Subject: Re: [Shotimes] New +20 cam dyno results
>
>Dave,
>
>You are probably right, but when I did research on this, most people 
>were getting small gains in torque and bigger gains in HP.  Although it 
>will be mostly a track car, I don't want to be shifting at 7500 rpm as 
>some people with this setup do.  The dyno guy said to shift at about 
>7000.  My SHO tach appears to be about 500 rpm optimistic at that level, 
>so if it shift when the tack says 7500 that should get me a shift at a 
>real 7200 by the time I actually do the shift.
>
>Still for such an old engine, I didn't want to have to twist it so 
>tight.  Nothing says I have to shift there, but then I won't get most of 
>the HP benefit.
>
>I will do the computer tuning and see what happens then.
>
>Don
>
>Dave Kegel wrote:
>
>  
>
>>You'd probably have to go with adjustable sprockets in order to get some
>>torque back, but you'll most likely sacrifice some of that 6700 RPM HP.
>>
>>But 220 HP out of a 3.0 is pretty good.
>>
>>Since it's mostly a track car now, I personally wouldn't worry about the
>>loss of torque.
>>
>>Dave
>>
>>-----Original Message-----
>>From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
>>On Behalf Of Donald Mallinson
>>Sent: Saturday, May 28, 2005 12:51 PM
>>To: shotimes@autox.team.net
>>Subject: [Shotimes] New +20 cam dyno results
>>
>>
>>Just got back from the first dyno test of the '89 with the new setup.  
>>Here are the details:
>>
>>Previous tests:
>>205-207 hp at 6100 rpm
>>196 lb ft at 4800 rpm  and 190 @ 3100 rpm (before runners open) 180,000
>>miles on the car/engine now, test above done at probably 165,000 
>>miles. Engine is healthy using about 1/2 quart per 3000 miles like it 
>>has since it was 45,000 miles young when I bought it.
>>
>>BOS basically, without a computer chip, running a Pro-Flo 77mm Maf.  
>>Walker exhaust with generic turbo mufflers.
>>
>>New:
>>+.20 cams
>>EH intake runners
>>BBB
>>new cam belt, plugs, wires, with NO computer chip or tuning, same setup 
>>otherwise as above.
>>
>>220hp @ 6700 rpm
>>182.5 lb/ft @ both 3500  and 5500 rpm  Torque basically flat between 
>>these rpm's except for a slight dip when the runners open at 4000 rpm.
>>
>>Air/Fuel mixture is basically 13-1 from about 3700 to 5700 rpm and then 
>>has a slow drop to 11.5-1 at 7000 rpm.
>>
>>First, I am shocked at the loss in torque, this is the exact opposite of 
>>what I wanted.
>>
>>Second I am a bit disappointed in the HP gain, but maybe more is to be 
>>had with some computer tuning.
>>
>>So tuner guru's..... a couple questions:  Where did my torque go and 
>>will tuning get any of it back?  Is there more HP to be had?
>>
>>Don Mallinson
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>>
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