MAximum rpms?

[KTA]

I have heard like he said of people having problems with them hanging. I also know that the vw stock spring package is torque biased meaning stock it starts to defuel around 3500, well at least on the 1.6l na cars.

[burnt_servo]

I have heard like he said of people having problems with them hanging. I also know that the vw stock spring package is torque biased meaning stock it starts to defuel around 3500, well at least on the 1.6l na cars.

but if you shorten the springs and preload them with shims it should pull well past 5000rpm ..... i haven't had to nerve yet to make it rev til the govenor starts working .

before i did this mod to my car i'd have max boost presure till around 4500 rpm , then it would drop off very quickly .


the 2 long screws on top of the pump , the first one can control idle , the second controls maxium throtle lever travel .
when the second screw is turned all the way out so it no longer stops the throtle lever , the govenor starts to work around 4500 rpm .

[SChandler]

If you run the VW spring and can spin the motor to 4500rpm, what is the benefit if the pump can't keep up? You will still be limited by the fill time (not sure if that is the right description of it) of the pump. Will the motor make enough power at 4000 rpm to make it worth it? I hope so, I'd like to hear a VE under power at 4000rpm on the sled pull track.

[seeker1056]

I beleive that if you mod the fuel supply and use the two lines aka KTA that the fuel issue is/will be resolved. ( we have this mod already to install)

the rpm is about wheelspeed - if your not movin at a good cllip by half track you either spin out or run out of power/come off the turbo.

you need 24-26 mph to be competitive in promod and 18-22 mph to be competitive in prostreet around here - and the chipped trux seem to be able to do that at will.

we top out at 18 mph at the moment with the VE - and we are the only VE in Prostreet here

I think if we can add 500 rpm under power, we will be right in the middle of things so to speak

[KTA]

I think you need somewhere around a 13.5 to a 14.5 final to be competitive depending on tire size. Your C6 doesn't have lock up though does it? Without lockup it will be pretty hard to be competitive I think since you can't get the power down as effeciently. It is tough being competitive with these new trucks since they can make 500+hp almost on stock parts. I admire your perserverance.

[seeker1056]

My C6 is custom made using the E4od gear sets for a 2.71 first gear and a 1.54 second gear - 33" tires, might try 35's
2.72? low range
custom made convertor furnaced brazed fins and special stator with roller thrust washers etc etc etc
so 26.09 first gear in low range
14.82 second gear
and 9.62 third gear
3200x33/14.82x336 = 21.2 mph
3200x35/14.82x336 = 22.5 mph
We were consistantly 18 mph so tire slipage accounts for that
The tranny works exceptioanlly well

We just need more power n rpm

Brian/KtA we would try anything you might suggest - we were only a couple feet behind the best P-pump truck they had and i think we can clean thier clocks with a bit of work

We are starting with a new motor, getting the fire rings done on the head, and plan to run the boost up to 65 psi from the 45-48 we ran last year.

thanx for the compliment

[KTA]

What transfer case are you running? Back in the old auto days aka pre lockup we used to paint white lines on the tires and video it to see how bad they were slowing down under load. It was a great tool, and man when we went to lockups that would hold did it ever make a diffrence. The problem with diesels and auto pulling is that if you run a converter tight enough to get good fluid coupling then it is too tight to get a big turbo lit. If you get one that is loose enough to spool a big turbo then you don't have good enough fluid coupling to do any good. That is where lockup comes in since you can get it loose enough to get on it, then lock it to put the power down.

[SChandler]

Does dual feeding the IP help with fill time? Isn't that the main obstacle to power at high rpm with the VE? We only have one piston pushing fuel to the injectors (vs. 6 for a P7100), so the faster we spin the pump, the less time it has to move fuel. If that can be overcome with the VW (or other) governor spring and dual feeding the pump, I think you are going to embarrass some P-pumped trucks. Seeker, just a note on your mph calculations, are you using measured radius for tire diameter or advertised? I have 255/85R16's on my truck. Advertised diameter is 33", but using the loaded radius gives a diameter of 31". That will make a difference in your MPH calculations. Regardless, it seems to me that if you could make about 3500 rpm down the track you would be right about where you wanted to be.

[seeker1056]

one ton Borg warner 1358 i beleive

We will try the white line thing this spring, however as I said - i dont think we are losin too much from the convertor - it appears to be tight at the advertised stall of 1600 rpm - and for sure it isnt like the old convertor which would and did flash up to 2300 rpm when the power came on

[bgilbert]

Well anyone get their hands on a VW pump/governor mechanism and throttle shaft? I'd be willing to test one out;). Maybe not on my 14mm pump, but would do it on a 12mm pump. Not sure if the 14mm pump would like the high(er) rpms.

[GO OVRIT]

Keep an eye on ebay. I missed one last week by forgetting to get on and bid. It went for 50 some bucks. It needed a rebuild, but the gov assembly should be fine.

[bgilbert]

Keep an eye on ebay. I missed one last week by forgetting to get on and bid. It went for 50 some bucks. It needed a rebuild, but the gov assembly should be fine.

What year range do I need for one of these Bosch VW pumps with the min/max governor spring? I'm gonna put a want ad on a local website and need to know what to ask for. I'm sure there's someone with a broken down VW diesel car or truck laying out back around this area.

[DoWhat?]

Any updates on this? Full fuel at 4500rpms would put a lot of p-pump trucks to shame.