Hyd steering presure adjust at idel?
 

Since the suprercharger last summer, I noticed my hydraulic steering has become tough to work when docking at idel. Bump up the rpm to 1000 and it's fine. Is there a presure adjust to this system. The pump is stock, Merc hp500efi, the rest of the system is IMCO .

Add on or full Hyd?

RPM is the factor, so I assume you dropped the idle RPM from the motor change?

I have the same problem, has done since installed, full hyd, with power assist, Imco sys. 1000 - 1200 rpm great, under 1000 harder than H---
Larry

Full hydraulic should not be hard to turn at idle. I can turn mine with 2 fingers at a 700rpm idle. There is an orifice fitting you can drill out where the high pressure hose connects to the pump also.

Here is a link to an article about this modification...:cool-smiley-011:

http://westtexasoffroad.homestead.co...rsteering.html

Doug

Just read the link, thanks, I will give it a try.
Larry

Was the pulley ratio changed with the other changes?

exactly. somewhere somehow along they way you slowed the pump down and it wouldn't have to be much at all to do exactly this.

No same pulley, same RPM at idel, Full Hydraulic steering.

I've had the problem since the supercharger was put on.

I'll read that article posted above.

Maybe just a pulley change would be easier than removing the pump and drilling pieces out.

I'm going to try buying a smaller pulley first.

smaller for the pump i presume... because it would have to be bigger for the crank... and thats my/our point... when the pulley stack on the crank got changed for the blower, my/our guess is that the crank pully got smaller at the same time somehow...

I would drill out the fitting, its easy to take out.Here is some picks of a 500efi pump
http://www.offshoreonly.com/forums/s...power+sterring

I might have a extra orifice fitting out of a pump I could measure if wanted ?

On my Scarab with the older design pump,Mayfair steering it was slow to turn at idle, the blower purged about 600rpm,so on the down cycle it was hard to turn. I had compared the orifice hole size to my 70 Chevelle, and the marine pump had a larger hole

Drill it 11/64....per Imco

Ok, the boats at the cottage and I'm not back there till Firday night. I'll look and see if I can get that fitting out without too much disasemebly.

I just read that again, lookslike I only need to drill out the one outter fitting. The inner fitting increases the presure. I only want to increase the low rpm flow. This is sounding easier.






Birdog, what do you mean by "....per imco" ? Is this what they recomend? I guess I could just try and call them.

Don't see how the SC has anything to with this problem. Actually, if the rpm and pulley speed is unchanged, I can't see anything causing this problem. PS lines not kinked during the reinstall?

"US1 Fountain" is right. If nothing else has changed, something is wrong. Anything that may have changed should be checked. If there is a filter, replace it. If something else is restricting the flow, opening up the fitting may not help.

I'm not posative the main crank pulley wasn't changed. The supercharger pulley sits infront of the main pulley, so it shouldn't have been changed. But I havn't confirmed this.

Here is a pic I took last year after the install. Kinda hard to see, but it looks like the original pulley (which is blue) is still there. I'm going to send an E-Mail to Dustin and ask if there is a new main pulley with this kit.

That would explain everything.

You have the same set up as me ,Mine idles around 750-800 if its alittle lower that 750 you can feel its a little stiff, But it only when I'm parking it.Being your is a single your turning it a lot more. I found that I had around 150-200psi restriction we determined it had to be a hose end, I thought it was causing a hard to turn steering and it ended up being the plastic bushing and bearing in the Marine machine hub,Falcon is very knowledgeable on this, he and other posted a bunch of info on my thread.



heres a thread on the hose....http://www.offshoreonly.com/forums/s...hydraulic+hose

I have had 3 go bad so more than likely thats were its coming apart on the inside and could of caused the restriction .I was told around 50psi is around norm on the free flow of the fluid, The gage ckecker I made up is easy.#6 gage adapter and a nos gage,put it inline were the filter is just for the test, bench testing it would get up to 1500 making it build pres, by crimping the hose, useinga 1/2 drill if you crimp the hose all the way dead heading it will stop the drill and and spin back,tuff on the wrist.

Also you can make a union for the filter which would bypass the filter to se if it helps , The filter element is a wire mesh , cleanable, I didn't see any restriction in mine,hope some of this helps,Rob:D

I have read through your thread Strip. I am going through a process of elimination right now. My first step is to confrim the whiple kit didn't changed the main puley. Then, I'll check for a crimped line this weekend. After that, I will concentrate on the pump. Thats where your thread will be read, and re-read I'm sure.

Is your WP lower now too as compared to previously since the SC install?

I know my blower pully is 8in, I an thinking the small on is the same as stock

Yes, but before it would almost peg the gage. Now it runs where it should. The water temp is much cooler.

the kit comes witha restrictor,Whipple wants it to run cold,

The water crossover prop made a diff in press and does yours have the whipple fuel cooler?

This is corect, whipple wants this engine to run cool. This is what has given me trouble the past couple of weeks. My engine builder had the engine running 140 on the dyno and tuned it that way. Now that he sees this engine runs less than 100 we are having to retune and to get her to run perfect. I'm very glad I put an oxi sensor nub in the exhaust !

As for the cool fuel from Whipple, I don't know. I don't think so.