Even more DIY questions

[BuickMike]

Hey guys,

Thanks a bunch for all the help I've gotten so far.

I've got a couple of ideas of how I want to setup my DIY system and want some input on how each idea would work with my mods. (See sig)

First idea is to to a dual nozzle setup. Have an M10 come on around 8-10 psi for starters and have an M15 come on around 15-18psi or so.

Next idea is a single M15 set at 10-12psi.

Some additional questions are:

Approx how much timing could I run in each scenario?

How bad would the bogging / transitional knock be with the single nozzle setup? My plan is that if I go single I may eventually get Razor's Progressive controller, but being that I'm on a real tight budget that may be a long while.

 

[Razor]

Run a single 15 with a shurflo and play with the turnon points and pressure screw setting till you find its sweet spot.

There is always a trade off. The tradeoff can be minimized by carefully selecting componenets and staying the course. There is only so much you can cheapen a system and still be reliable.

If you torch a head gasket/hurt the motor, the savings employed will be offset tremendously. So you are better off buying one quality part at a time than making a rush decision to have something fail.

 

[salvageV6]

I like idea #1 and about 20-22* timing and as much boost as you can run without KR.

 

[Red Regal T]

I've been running DIY as per Steve Monroe for 5 years and 100,000 miles. No downsides.

 

[turbowannabe]

I just finished up installing my DIY alcohol kit with the Shurflow pump installed and it seems to me that the pump pumps pretty slowly(maybe two pumps per second). Is this normal? I checked the nozzle while the pump is pumping and it looks to move a good amount of fluid, but there is a decent period of time inbetween sprays. The power source I have hooked to gives a little over 12volts at my power source when not running so I'm sure that's not a problem. What do you guys think? I'm contemplating selling this pump in favor of a non-diaphram style pump, but before I do that maybe you guys can help me out.

thanks
Dan

 

[Razor]

See you made a small orfice for the pump. Now the pump spins.. hits the pressure switch limit.. then shuts off until pressure drops. It is normal for the pump to do this "IF" you apply 12 volts across its wires. Its called cycling. Now the way to stop this is simply drop the voltage applied to the pump..

If you go with an EFI pump, then the problem is you have no way of adjusting its flow. On the Shurflo at least you have the pressure screw on top of it to regulate the cycling. But it will always cycle when used in the DIY format.

The DIY recipe has worked for many and the pump used as is with cycling.

Guess if you do some research why I make the controllers to eliminate any cycling.

But that is a whole other issue.

HTH

 

[Red Regal T]

So you're saying you have lots of knock?

 

[turbowannabe]

No, actually I only got knock readings on one run which only gave me a reading of 2.1 knock retard degrees, and that's when I waited untill farther on in the run to turn the alky on. What was making me concerned about the pump pulsation is that it didn't seem to use up a whole lot of alky. I made lets say 10 runs and didn't even use up half of my bottle. I remember reading something on here about an upgrade kit you can get for the shureflow pump to make it put out 100psi, do you guys know anything about that? I'm going to do another search and see if I can find anything about it.

thanks
Dan

 

[Razor]

100 PSI is easy. Just get your allen wrench and turn down the screw on top of the pump. Put it to whatever PSI you like.

Your going to always fight the fixed point system. You up the pressure then it bogs when the kit fires. You lower the pressure then it doesnt bog but knocks on the top end. You raise the turnon point then it knocks till the alky catches up..

Some cars will work with higher pressure fixed point systems... tho its not the typical.

Multistage or progressive if you want to really squeeze the motor.

For 20 PSI, you'll be fine. Start upping the boost, leaning down the O2's.. trying to extract power.. you'll find your limitations quickly.

 

[Red Regal T]

Originally posted by turbowannabe
No, actually I only got knock readings on one run which only gave me a reading of 2.1 knock retard degrees, and that's when I waited untill farther on in the run to turn the alky on. What was making me concerned about the pump pulsation is that it didn't seem to use up a whole lot of alky. I made lets say 10 runs and didn't even use up half of my bottle. I remember reading something on here about an upgrade kit you can get for the shureflow pump to make it put out 100psi, do you guys know anything about that? I'm going to do another search and see if I can find anything about it.

thanks
Dan

Well, if you're not getting any knock, what are you concerned about? You're disappointed you're not using more alky? If you get more knock because you turn up the boost, turn up the pump pressure. Maybe you'll be lucky and use up more boost juice.