Engine/Transmission (1998.5 - 2002) Has anyone done a p7100 conversion and been unhappy with the result?

[RonA]

Has anyone converted to a p7100 and been unhappy with the results?

RonA

 

[TxDieselKid]

Although I'm not sure how he feels now, and havn't seen him post in a long time, Larry Craford did his and hated it.

 

[Gary - K7GLD]

Lots of time, work, and $$$$$ - and you end up with a pump that is less flexible in daily driving and probably voids emissions warranty in most states - It's probably a good mod for rigs strictly used in off-road competition, but a waste for a daily driver.

 

[RonA]

Gary.

I know all that. But is there a down side?

RonA

 

[TxDieselKid]

Originally posted by RonA

Gary.

I know all that. But is there a down side?

RonA

Lots of tuning is needed before they run right from all the changes in the motor. If I wasn't in college, and had the proper time to devote then I would do it as I see it being an advantage(not for power).

 

[RonA]

The reply to gary was not a question, but an attempt at humor. I have had a p-pumped 24valve motor in my truck for 8 months now. But I am curious to know if other people have tried it and had problems .

RonA

 

[Gary - K7GLD]

Ron, are you satisfied with yours from the overall performance standpoint - is it all you had hoped for or expected - and how much $$$ do you figure you have invested - would you recommend it to others?



THAT oughta keep ya busy for a bit...

 

[RonA]

Gary.

I lack something to measure it against. My 92 motor was 200hp and 600lbs and 18mpg city 20. 5 hwy. This motor is currently 370hp 1022 torque 17 to 18 city 20. 5 hwy. I've never driven an electric truck before. It would be nice to have a comp box and water/meth inj. Then I could hang out with the Ford guys. But as it is I'm a little down on power to play with them. I am a meat and potatoes kinda guy so the p-pump fits me. I think I could of made the power I want a little easier and alot cheaper with the electric. But no one knew how to hook all the bells and whistles up. So we did it this way. As for the money. I look at it as paying for my education. There are a couple diesel shop owners that can afford to send their kids to college thanks to me. Glad I could help.

I think that once the twins are installed I will have a pretty good truck. And I will still have less money in it than a new one. And in my opinion the new trucks are butt ugly.

RonA

 

[Gary - K7GLD]

OK Ron thanks for the info - didn't realize you never had the VP-44 to compare against - did your engine come with one, if so what did you do with it - I'm on the lookout for a (cheap, but good!) spare for backup "just in case"...

 

[HoleshotHolset]

Mark,



Are you reading this?



Don't let 'em get you down, man.



Matt

 

[Forrest Nearing]

everyone always says "lots of tuning"



just how much tuning can there be?



timing, fuel curve, and boost curve...



as long as the injector pop off pressures match the pump, I don't see how tough it could be...



Forrest

 

[Gary - K7GLD]

Forrest, I suspect most of these P7100 conversions are done primarily to replace the VP-44 some hate - consequently, the "tuning" probably relates to obtaining the same all-around flexibility as is available with the VP-44.



And that is a pretty tall order - the computer controlled VP-44 is a marvel for the instant, on-the-fly changes it is capable of under widely varying operating conditions. And to try to come close to that flexibility with a purely mechanical pump has to be pretty difficult.



Based upon what I have read here concerning the P7100 conversions, you can hit a fairly broad efficiency range with the P7100 at one end or the other of the scale, but I doubt ANYONE has achieved the across-the-board flexibility the VP-44 provides.



Some are willing to pay that price, both in broad spectrum efficiency, as well as the costs involved in the conversion...

 

[RonA]

I saw my name on this and thought something was fishy. Didn't realize it was a year old. I just got my truck back from being properly tuned at PDR. It is really nice. I believe they tried 4 different sets of idle springs before they got that fixed. Injectors are fussy also. I should have taken it up there sooner. I won't wait so long next time. I have never driven a vp equipped truck. My truck runs as well at light throttle now as it did with the first gen motor in it. It starts pulling strong at 1500, peaks at 2400, and falls off at 3000. It easily accelerates out of tight turns from as low as 1200 rpm. Smoke is pretty minimal. No more than alot of 24 valve trucks I have seen with less hp. I got 20. 6 mpg on my last tank. I took it pretty easy. I'm not setting any records with it at 502hp, but I have more power than i was looking for. That is with a set of Jammer 1 injectors. They installed the 1's because the 2's were slipping the clutch.

Ron

 

[Forrest Nearing]

sorry for bringing up an old thread, but this is something I'm interested in because I'm going to be buying a new (to me) truck when I get off the road... I really want a white 98 12v QC SB 4x4 5sp... but I was thinking it might be tought to find... and if I went with a later 2nd gen, I could get a 6sp and disk brakes, and just do a P7100 swap on it...



the "flexibility" of a computer controlled pump is not a selling point to me... the right foot dictates mild or wild



Forrest

 

[Todd T]

Personally i think the 12V motor as a whole is a better setup to start from. the cylinder heads are more abundant, less troublesome and more aftermarket parts are out for them (reads: stiffer springs, keepers, and better valves) try searching for a "GOOD" 24 valve head that is not a reman. That may enlighten you I can buy 12v blanks for $300 all day long. So with that, to take a 24V motor and turn it into a 12V is expensive at best and probably harder to then fine tune and modify heavily.



You'd be money ahead to upgrade a 12V chassis than to convert the 24v motor for the sake of it's chassis.



Oh and it wouldnt be that hard to change the color of a truck either. you're gonna have the front end off and engine out more than likely anyway. a 98' would be ready for a fresh skin by that time too.

 

[Bpostel]

J. R. Adkins done the conversion on my truck and its all for me. All the gauges still work including cruise control. There is not that much to tune on like everyone else says. Set your timing, adjust your plate and AFC housing. Get a decent set of injectors and have some fun, it's not that hard. If people ishaving that much problems with the conversion, I'd recommend getting the truck to J. R. , he hit the nail on the head the first time.