1st Gen PDR Cam

[nascar mark]

Just finished testing on the PDR cam and would like to share my results as many of you have asked what are the results and how can we get one for our selfs.



We changed cams 3 times trying to find the right combo and believe we have found it. The results are faster spool up with boost coming on almost instantly. Egt drops of 50* at idle, which helps shut down time and 100* drop at 60mph and 75* drop at 100mph holding steady.

I also noticed it took the engine 3 sec longer to reach 1500* when pushing it at wot.

Fuel mileage also improved slightly with . 4mpg around city and . 9mpg highway driving.

I have pulled on long trips as far as the Alaska Hwy and am very happy with the PDR cam. I can't give you a proper comparison of mpg while towing as the weight changes every trip and amount of 4X4ing changes every time. I can say seat of the pants get up and go for hills and passing improved and egt's were down 100*.



Our 1st gen engines need all the help they can get with our small turbo's and poor flowing heads so I can recommend the PDR cam to all.



I would like to point out all testing for numbers and towing were done with the stock H1C turbo that comes from the factory on our 1st gens. I have run a modified PDR HX35 also on the road and track and can say it helps even more. It was hard to take the HX35 off for more testing but one has to do what one has to do.



mark

PDR - Black Sheep Racing

 

[formula]

Great results Mark. What is involved with changing the cam?



SP

 

[nascar mark]

Its a lot of work and don't recommend shade tree mech doing it as you need special tools that you can't just buy at tool store if you are going to swap cams with head still on engine. Nothing like doing a V8 which is easy.



Front of truck has to come off and if you have air cond like me its even harder. Rad out and cut front support out. Gear cover comes off, head towers come off, push rods out, cam with gear comes out and each of the 12 tappets have to come out cam hole. Cam gear is pressed off and gear is heated and put on PDR cam. Reground lifters are then put back in through cam hole one at a time. Cam back in,gears lined back up and new seals attached to cover,etc. Push rods reinstalled with towers. Re torqed, and valve lash redone. Front support has to welded back in. Put front pulleys back on, rad,and rest of front end too. Break in cam at 1500rpm's for 20mins in neutral.

As I said, not a easy install.



mark

PDR - Black Sheep Racing

 

[formula]

Mark,



Thanks for the explanation. I had a feeling that the cam swap was a bit of a nasty job. With all of the cam swaps you've done I'm supprised you dont' have a quick release front end on your truck





Sean

 

[Old Smoky]

Thanks for the testing results, Mark. It's really nice when you can see what the differences are in numbers, instead of a general "it helps. " It's good to have a guy that can test stuff for us, and report honest results.



Mike

 

[BCaldwell]

And no bracken pieces or lost porta-potties or lawn chairs bill

 

[Mark_Kendrick]

A cam swap is a good day or so job for us shadetree guys but it is a do-able task. the hardes part is pressing the gear. It takes about 7k of press to remove it.





Don't let it scare you if you wouldn't mind it on a chevy v8.



Later,

Mark

 

[RDusch]

Mark



Did i read this right

I also noticed it took the engine 3 sec longer to reach 1500* when pushing it at wot.

1500 degf, i pulled my camper of a couple weeks ago and empty on flat ground i can barely get 1000, i even turned my fual screw in another 1/2 turn with not much more heat and no more smoke.



do you know what the safe limit on the fuel screw is (turned in from stock) with big injectors? i'm only about 3/4-1 turn in now.



Great post Thanks



Rick D

 

[nascar mark]

Originally posted by RDusch

Mark



Did i read this right.

Do you know what the safe limit on the fuel screw is (turned in from stock) with big injectors? i'm only about 3/4-1 turn in now.



Rick D

Yes, with stock H1C I was hitting 1500* in 7 sec from dead stop with wot. Remember I am very heavy fueled with my tricks.



Every truck is different but 1. 5 turns is still safe and wear and tear on the pump is min. Believe it or not my fuel is only turned in about that too. My truck still Idles at 775rpm in gear.



Guess I have a good pump.



mark

PDR - Black Sheep Racing

 

[BushWakr - RIP]

..... "I'm supprised you dont' have a quick release front end on your truck... . " :-laf :-laf

Atta boy Bill, you tell 'im. .

Guys, mark and the boys at PDR worked hard on this one. . I saw the effort(s) they went to, not to mention the patience mark exhibited during the whole process.

He actually took is annual holidays and did some of the testing during that trip. . I don't think I'd want to risk breakdown or failure on MY holidays.

Good results mark. For the more moderately fueled guys this will help even more and, for the towing crowd it's a nice improvement to help with breathing/EGT's and turbo spoolup to get that load moving.



*Note*: speaking as an end user and NOT a moderator.



Bob