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Piers Cam Update

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Here is an update on the Piers cam in my truck. As you guys may remember I was impressed with the Piers 24v cam that was installed in back July. Fuel mileage was up, egt's down, and top end power increased slightly. The one thing that didn't change much was spoolup time for the turbo:(.



Well..... I must now happily update the spoolup issue! Seems that when the cam was installed the valve lash was not set correctly. On Thursday night I set the lash to the correct specification and boy did the truck come to life! Spoolup is very much improved. In fact just cruising down the road at 65 mph on level ground I always showed 0 psi on my boost gauge, now it reads 3-4 psi. Also when I dynoed this weekend during the MD-TDR Fall Brawl the charts confirmed that I was in fact producing more HP and torque at a lower rpm. Peak #'s were just up slightly but prior to the cam install I reached 750 HP at 3100 rpm and 1200 lbs torque at 2550 rpm. After the cam install I obtained 750 HP at 2600 rpm and 1200 lbs torque at 2200 rpm! The two dyno runs compared were identical setups on the truck except for the cam.



As for driving the truck I can really feel the increased low end! Another benefit from getting the valve lash set correctly is a further decrease in egt's. Turbo cooldown time is almost nonexistant when the outside air is around 75*. For anyone considering a cam change I HIGHLY recommend Piers' Cam!



Doug
 
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Jet Pilot,

I also have a Piers cam and was unaware that the adjustment on the lifters was any different than normal. If they are different, what are they so that I can do mine. Thanks.

WD
 
WDaniels



The adjustment is not any different than normal. Mine was just not set correctly during the cam installation.



Doug
 
I am curious about peak HP. Before cam was 750@3100 and now its 750@2600. What is the power now at 3100 rpms? Does the power fall off after 2600 or does the cam hold the power from the 2600 new peak thru 3100 like it was before?
 
Prior to the Piers cam peak HP started to fall off around 3200 rpm. Since the Piers cam I am able to hold peak HP until 3400 rpm. Peak torque has stayed the same, both before and after torque drops below 1200 at 3200 rpm.



The point I am trying to make is Piers' cam has allowed me to produce more HP and torque lower in the engine rpm range with no degradation on the upper end. In fact HP level on the upper rpm range is held longer!



Doug
 
PDR CAMSHAFT

Wow that makes for a nice wide power-band, just what I'm looking for:D



Jetpilot, How about smoke reduction, some guys are reporting smoke cut by 1/3 to 1/2. Whats been your experience? TIA
 
R. ebel,



Seems like smoke is down..... To be honest I put in BIG injectors for the dyno day and they smoke like a train. I will give them a try plus some more moderate ones and get back to ya. My bet is smoke will be reduced significantly, now that I am able to make boost so much sooner the smoke should be thinned out.



Doug
 
Here is a companion thread to this on from another board. There is some good info on our motors and cam shafts in general.



JR
 
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