2nd Gen Non-Engine/Transmission Rev Limiter bypass.....is there a way?

[HVAC]

You Wanna Break Axles?

I know how you feel regarding the problem with modifying the ECM RPM limit. IT"S JUST NOT FAIR!!!



Cancer isn't funny, take it from me. I lost both parents. Mom didn't drink, smoke, eat stupidly (like I do) use drugs, etc



QUOTE:



"I can't believe that I didn't get to see you at Muncie"



Well I saw you! You were the entertainment and I was slurpin' water and workin' on my sunburn while up there in the stands. I had to leave my truck at home with a case of the hiccups It's cool that Doug busted up the competiton in the drags where I would have been competing.



QUOTE:



"The B1 is doing all that you have stated"



And how!!! You and Doug are like "Robocop" to diesel competition! If it did not work, I wouldn't have put my name on it. I sell it (B1) and I'm putting one on my truck. It's the best performance turbo available. The B1 exceeds the 35's and 40's by a sharp margin. It even outflows a hybrid H2. The B1 even kicked dirt on several twin systems at Muncie



QUOTE:



"Imagine the B1 as the small turbo in a compound setup"



We've been doing better then that! We snapped off the left rear axle on Chris's truck at a pull a week and a half ago. Too much twin turbo B1 power! It didn't hop, it just couldn't take the hook from the new boggers. The Performance Diesel sponsored pull truck now has a Dana 80 to do battle with.

 

[Roger rodbolt]

B1

Quote:

The B1 exceeds the 35's and 40's by a sharp margin. It even outflows a hybrid H2. The B1 even kicked dirt on several twin systems at Muncie.



I've modified and ran both the '35 and '40 on my truck and agree that the B1 beats them soundly. I have a H2E and was ready to send it to Pius for mod's when I jumped on the B1 and never regreted it. The B1 will make low 50's psi if I get a good hook on the sled. I see about 1000 preturbo egt 3/4 down the track but they rise quickly at the end... ... twin time... ..... !!



The old black truck did okay in the sled pulls at Muncie, but I hope you didn't see it on the strip... ... ..... mainly pilot error but I got sand kicked in my face. I've done more street racing then I'll admit to my kids but had never been on a real drag strip. Left on the green at 1100 rpm in 2whdr and rolled on the throttle for traction control... ... the auto trucks in 4whdr were gone . and then I started rowing the six speed. Tried a third gear start at 2200 and bogged reclutched, spun, shifted (no forward speed), bogged..... well at least I had fun and hoped no one noticed .



Sorry about the axle. Sled puller had Dana 80 trouble and Big Don just snapped the axle on his dually and trashed the carrier while hooked to a sled. He runs 36" Swamper's or Bogger's but I was surprised that he snapped the axle as his clutch wasn't transfering all the torque that his mighty 5. 9 was pumping. So far I've not had any problems or broken anything..... keep up the faith. Larry

 

[Diesel Freak]

I think the only solution for a higher rev limit for the 24valve engine is a P pump conversion.



unless you use a Volkswagen FPCM and ECM on the ISB... and even then it may not work.



you can get to 3550 RPM before shifting if you do it right on a BOMBed rig... ... you just have to take advantage of the TPS/RPM disagreement that comes when using large injectors

 

[Roger rodbolt]

Originally posted by Diesel Freak

I think the only solution for a higher rev limit for the 24valve engine is a P pump conversion.



unless you use a Volkswagen FPCM and ECM on the ISB... and even then it may not work.



you can get to 3550 RPM before shifting if you do it right on a BOMBed rig... ... you just have to take advantage of the TPS/RPM disagreement that comes when using large injectors

Diesel Freak,

I've accumulated most of the parts to convert to a P7100 but decided that I like the variable timing/etc. that is availble with the VP44, especially for a daily driven truck. I get about 3550 unloaded rpm now but believe that substansial defueling is occurring before then. What do you mean by taking advantage ot the TPS/RPM disagreement as I do have large injectors? I appreciate any help . Larry

 

[Snow man]

If you could get the vp44 to fuel hard at 3500+,the EGTS would go melt down,in addition the strain on the pump may cause it to have an extremely short life. I would like the increse my RPM's,but only if it can be somewhat reliable.

 

[HVAC]

Snow,



The program in the ECM is defueling hard at 3500 which one can see when viewing a dyno sheet. The other thing is that at high rpm your making a lot of boost which will tend to drive down the egt levels.



I cannot site my source, but I have seen several people claim the VP44 can easily go to 4500 rpm

in other applications. Now that would be cool eh?

 

[Diesel Freak]

Originally posted by HVAC



I cannot site my source, but I have seen several people claim the VP44 can easily go to 4500 rpm

in other applications. Now that would be cool eh?

That would be sweeeet, but in those "smaller" applications the VP44 does not have to push the volume it does in the ISB application

 

[Diesel Freak]

Originally posted by Roger rodbolt



What do you mean by taking advantage ot the TPS/RPM disagreement as I do have large injectors? I appreciate any help . Larry

Basicly... all you have to do is lift off the throttle a little while under power, and you can go past 3200 RPM, but this does not net you anything but a smoother shift.....







as for applications where the VP44 feeds an engine past 3500 RPM



here you go



OPEL DTI, AUDI - VW Passat V6 DTI, BMW 320D



4500 seems to be the limit on the smaller engines

 

[Rob Thomas]

Yea, but what about our engines, what's the limit?



Later, Rob

 

[Diesel Freak]

3500 rpm High Idle

3200 RPM full load

 

[Rob Thomas]

No, No, No,





I mean IF we didn't have a rev limit, how high before explosion?

Or how high, and still be somewhat "safe".



Later, Rob

 

[Diesel Freak]

ask Piers!

 

[Big_Daddy_T]

In other apps the vp44 is spinning 4500-4800 rpm according to our european guru. They even have higher pop off pressures. around 5500 psi i believe unlike our 4400 or so.

When the rebuild program starts maybe enough information will be obtained to overcome the limits. I dont think the flow rate would kill it at higher rpms.

Screw it. I think scheids has a way around it why dont you buy one of there pumps(haha). I think a 12 valve pump would solve our low rpm problems. The big question I have has been answered. Is there useable power above 3500 rpm? Scheids truck proves there is(If the rumors are true).

 

[Diesel Freak]

if the VP44 is spinning at 4500 RPM..... then the engine is at what rpm? ( the VP44 spins at half the engine RPM)



the VP44 is capable of generating pressures in excess of 20,000PSI



ISB line pressures at WOT are MUCH higher than 5500 psi

 

[HVAC]

BDT, the pop off pressure is more a function of the way the injectors are set up rather then an off shoot of pump operation.

 

[Snow man]

Thanks HVAC,Ive heard that even the drag programming which fuels hard to 3200,is tough on the pump. A P pump sounds better all the time,buti ts too much work,so ill stay with the fragile,and RPM impaired vp44 for now.

 

[Ron Bissett]

Better POP than Bang I rather stop than pop . Ron in LOUISVILLE KY Oo. Oo. Oo.