[Shotimes] New +20 cam dyno results

[Donald Mallinson]

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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