Author Topic: How to get 8000rpm's? (Read 9829 times)

Duzty · « **on:** April 21, 2009, 09:33:11 am »

How do i get my AAZ to take 7-8000rpm's?
I would be happy if anyone could show it on a picture

TurboJ · « **Reply #1 on:** April 21, 2009, 09:40:01 am »

7000 rpm should be possible with a wild cam and extensive pump modification. There might be one example of this in a couple of months time (my friend's engine). Talking about 8000 rpm though, I think no existing VE pump is able to do that...

BTW, your setup on your sig looks very interesting. Got a dyno slip?
And if not, at least tell us the power and torque.

Duzty · « **Reply #2 on:** April 21, 2009, 09:46:22 am »

Can't I do anything to the govenor to get it to rev pretty high?

I got af movie-clip from the dyno, where you can see the HP on the wheels.

http://www.bilgalleri.dk/vid_vis.aspx?VideoID=19064&xl=

burn_your_money · « **Reply #3 on:** April 21, 2009, 09:47:47 am »

Please post the video

It's not a matter of the governer, but rather keeping the rollers on the cam plate and also being able to supply enough fuel quantity and pressure at 8000 RPM

Duzty · « **Reply #4 on:** April 21, 2009, 09:52:59 am »

Quote from: "burn_your_money"

Please post the video

It's not a matter of the governer, but rather keeping the rollers on the cam plate and also being able to supply enough fuel quantity and pressure at 8000 RPM

I think the fuel won't be a problem.
But the rollers, hmmm.... :?

TurboJ · « **Reply #5 on:** April 21, 2009, 09:53:56 am »

That's pretty nice :twisted:
242 hp at the wheels, no? At what rpm was the peak power?
As the video is a little blurry, I can't see the revs very well there.
At what rpm do you get full turbo boost?

You can of course modify the rev limiter to allow more revs, but I believe 7000 rpm is pretty much the top for the VE pump design.
The pump just isn't able to inject enough fuel to each injector line in that short a time. The time window for each injection pulse becomes too short, and the amount of fuel per pulse will be seriously limited after a certain rpm.
6500 rpm TD engines are many, 7000 rpm AFAIK is still to be done (with any real pulling power at that rpm). 8000 rpm - I don't think that is possible with a VE pump.
You shouldn't need that kind of revs though.. Imagine adding 2000 rpms more to your power band and you're flying past 99% of gas engined rivals you might face!

Aki-76 · « **Reply #6 on:** April 21, 2009, 09:54:58 am »

i think TurboJ mean my own twin turbo engine.I try to raise rpm about 6800-7200,and max power about 7000..

Camshaft is fully race ( 280/13-13.3mm) and feedpump is my own desing ( big core ) pump..

TurboJ · « **Reply #7 on:** April 21, 2009, 09:57:50 am »

Ha! Whenever there is talk about a high-power AAZ, Aki is there in a second

BTW; after seeing some of the parts Aki will be using on his engine, I wouldn't doubt the end result... It'll be interesting to hear what the engine sounds like at 7200 rpm

Duzty · « **Reply #8 on:** April 21, 2009, 10:00:02 am »

If i remember right the peak power is around 4500rpm's (haven't driven it ½year)...
Full boost around 3400rpm's.

PIC's of how to modify the rev limiter PLZ

TurboJ · « **Reply #9 on:** April 21, 2009, 10:03:28 am »

Search this forum for the rev limiter mod - there's plenty of info around!
(search: governor mod, gov mod)

As for Aki's or my pump, the rev limiters in our pumps are entirely different design since we don't use VW pumps at all...

Op-Ivy · « **Reply #10 on:** April 21, 2009, 10:10:42 am »

8000!?!? That's way too high! Mind you I don't even like the idea of going past redline on these engines. You have to remember they weren't designed to rev high like that and anytime you bring an engine that high the wear and tear on it increases.

I doubt you would get good solid power up that high. IMO stay in the lower rpm power band and use your gears!

Baixo · « **Reply #11 on:** April 21, 2009, 10:18:54 am »

Quote from: "TurboJ"

)

As for Aki's or my pump, the rev limiters in our pumps are entirely different design since we don't use VW pumps at all...

Which pumps are you guys using?

arb · « **Reply #12 on:** April 21, 2009, 10:19:01 am »

I think if you blue printed the engine (static balanced) and then did a dynamic balance, did the cam, stronger valve springs, and installed a common rail for the fuel, you could get it. But, I don't think anyone had adapted common rail injectors to our head, much less adapted the high pressure fuel pump.

rallydiesel · « **Reply #13 on:** April 21, 2009, 10:51:37 am »

If you are actually going to try to go that high, I think you should find some stiffer plunger return springs.

Maybe a fuel cooler as well?

carrizog60 · « **Reply #14 on:** April 21, 2009, 11:11:39 am »

Quote from: "Duzty"

If i remember right the peak power is around 4500rpm's (haven't driven it ½year)...
Full boost around 3400rpm's.

PIC's of how to modify the rev limiter PLZ

you have that power without the governor mod? :shock:

Author Topic: How to get 8000rpm's? (Read 9829 times)

Aki-76

Baixo

arb