Piers 3K spring install

[Jim Fulmer]

I just got them today and read through the instructions and went for it way to easy, the hardest thing is turning the motor over(single person) and getting that dang cap back on (hint; take the top bolt out of the arm next to it so you can get a better shot on the install... you'll know what I mean) other than that get ready for some EGT cause mine went throught the roof of the test run(unlocked) backed the plate off a bit and it's alot better now. I didn't have to go back in and reset anything or adjust idle cause it needed to come up a bit. I'm very pleased with them and can recommend them to anyone. Thanks again Piers for your time and answering the call



Jim

 

[The patriot]

I have a question. My truck will rev to 3k (starts to defuel about 2700 rpm) so what would be the advantage? I've actually had mine to 3250 rpm.

Will this kit actually bring it substantially past 3K?

How about the 4K kit. I was thinking about this one.

Eric

 

[bholcomb]

Eric,

My truck would do the same as yours without the gov. springs. It would actually go to 3500 rpm in a low gear. After installing the gov. springs without the small springs it will wrap up to 3800 pretty easy and will go to 4k. That's enough for my use, so you'll have to wait for another opinion. They do make a difference across the whole power band, so I give them a thumbs up.



Brian

 

[The patriot]

Brian, was that the 3k or the 4k kit?

I'd be happy with 3500, but I'd like it to make power all the way to 3500.

Eric

 

[SlyBones]

Patriot,



With 12v about 3600 is the limit on the valves unless you install HD valve springs. 24v come with them so its not an issue there. Also the 4K kit comes with the HD valve springs. Its more expensive accordingly. Without the valve springs 3200-3400 is a good stopping point.



My truck would rev to 3K sometimes 3200, but as you describe it starts to defuel about 2750. Typically 3000 was normal with loss of boost as the defueling starts. On an incline it would barely hit 3000, some times not. You could feel the pull back off as the RPMs climb up there.



With kit it will easily run to 3200. Now even on an incline it runs hard all they way to 3000+ without even a hint of backing off. No defueling, no loss of boost, no hint of power loss. Now it flat charges to 3000+.

 

[Jim Fulmer]

Eric

The spring change is more than what is advertised you really don't know how bad the old springs are till you put these in, I can get 3500 in a 2 gear run(I was looking for EGT's) in normal on the floor run the converter(Stock) get's a hole lot better at 3k and that's about were it shifts. One thing I will miss about the stock converter when I do the DTT stuff is the fast spool up. I pulled out last night and nailed it going through a turn, took maybe a second to be at 3k and 28lbs, spun and took off. It's also nice to have getting on the freeway prior to lock up, at 2500 the converter starts pulling pretty good but in old configuration it was shutting off fuel, Hope this helps.



Jim

 

[SlyBones]

DTT Stuff

Originally posted by JFulmer

One thing I will miss about the stock converter when I do the DTT stuff is the fast spool up. I pulled out last night and nailed it going through a turn, took maybe a second to be at 3k and 28lbs, spun and took off. It's also nice to have getting on the freeway prior to lock up, at 2500 the converter starts pulling pretty good but in old configuration it was shutting off fuel,

I dont think you will miss it that much. The other advantages far out weigh it. Smiles will be too big to miss that. Once in a while in rush hour traffic it kinda a pain, but I am learning to drive around it. Just think instead of having to wait to 2500 to start pulling, it will just flat pull period, all RPM's.

 

[Jim Fulmer]

Hey Sly

That's what they tell me about the DTT stuff that it is night and day difference, wondering why you chose a 91 vise an 89. I talked to Stefan and he recommended a 89 unless I was going to get stupid with it, I really don't plan on doing much(may be a 280/685 plate) Piers said that's what he would do as the Injectors are pretty good, might try some DD's later down the road but It still my daily driver and I can't have it broke.



Jim

 

[bholcomb]

Eric,



I got my kit not long after they came out. It was advertised as 3800 rpm with 6 total springs, and then when you used the 4 bigger springs only it was supposed to rev to around 3500. I'm just guessing, but my experience with my truck and a few of my 215 engined friends shows they rev more than advertised. I would ask Piers or your supplier if they are still just taking the small inner springs out for the 3k kit, or if it is different entirely. If that is true go ahead and get the bigger kit and have the pieces for later. You'll have fun with it either way. Brian

 

[HoleshotHolset]

This may be a misinterpretation... . but as it reads, it sounds as if I can take out some springs and gain some RPM??

If so... cool! If not... . I guess I gotta spend some $. . no biggie.



Matt

 

[bholcomb]

Matt,



The 3800 rpm kit had 6 total springs 3 each side. Then not installing the inner springs would net around 3500 rpm limit. 4 total springs installed, 2 each side. This is what I was told for the old orginal kit. I don't know if anything has changed.



I guess I'll have to reword my response since it didn't work out. Sorry.



Brian

 

[Strick-9]

The governor springs used haven't changed much from my understanding since they came out.



Of course the more radical custom pumps have special springs, but the basic 'gov. spring kit' hasn't changed springs.



The governor seats have changed and, in fact, are still changing.

How your truck drives, how touchy it feels and how early in the throttle the power comes on is more related to the governor spring seats than the actual springs used.



Here is a picture of my leftover governor springs. Wouldn't you like to pick through this pan, Matt?



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-Chris

 

[C Schomer]

Does anyone have a phone# or web address for Piers? I like the sound of the 3K kit! Craig TIA

 

[SlyBones]

www.piersdiesel.com



Just thought I would add the picture of the spring kit on Piers' site is the 4000RPM kit. Shown with 6 springs and new seats. The 3000RPM kit is 4 springs as mentioned. Also the new seats are Piers' unique design.

 

[C Schomer]

Thanks Sly, I just e-mailed PDR! I just want a little more top end rpm and power to get through the gears when towing. I think the 3k kit would be good. I hope the 3k kit is easier to get setup than all the stories I've read about the 4k kit! Craig

 

[HoleshotHolset]

My bad... I misunderstood what you wrote.



Chris knows me all too well!

Yeah, I'd love to pick through any parts bin that deals with the P7100... . so much to learn.

After the guages (which at times seems as though I may NEVER get any... . ), I'm going to take the plunge and have Chris install my springs/seats.



Matt