SMC Alchy users. Turn on point.

[V8killR4U]

Smc single/ dual nozzle users. The turnonpoint knob has no stop to it correct. I have my turnon point with the dual nozzle hook up at 15 lbs, Id like to have the turn on point 17 lbs. Its seems as if the knob getts tighter as i try to turn it clockwise to increase the turn on point. I just want to maker sure i dont break it if i keep turning it clockwise. Thanks I have one m-10 nozzle and one m-15 nozzle. Any pointers. I heard i dont want my pump speed under 6 i belive too, can someone verify that for me.

Thanks,

Any pointer in tuning would be appreciated.

 

[salvageV6]

Pump speed on 10 in the GN.

First nozzle M10 turns on at 10 psi. boost. Second nozzle is staged larger M15 nozzle at 22.5 psi. turn on boost.

Need to get the alky. flowing early to avoid transitional knock and stage the nozzles to avoid flooding the motor with alky.

I use denatured straight and run 25 psi. boost on my PTE51 turbo. Maybe a bit more at the track rental next month.

I used an Industrial Automation solenoid to stage the second nozzle and a NAPA Hobbs type switch that was adjustable to turn it on.

Runs great on the street track times next month.

Ran 12.4 at 112 with the single nozzle and 23psi. boost last year.

15psi. seems a bit high for the initial turn on point.

 

[Razor]

Why are you using a dual nozzle?

 

[V8killR4U]

Are there instructions on how to set this up. "sTaged nozzles" Sounds like the ticket to me cuz right now both come on at bout 15 lbs and i think its sspraying a bit to much.

Originally posted by salvageV6
Pump speed on 10 in the GN.

First nozzle M10 turns on at 10 psi. boost. Second nozzle is staged larger M15 nozzle at 22.5 psi. turn on boost.

Need to get the alky. flowing early to avoid transitional knock and stage the nozzles to avoid flooding the motor with alky.

I use denatured straight and run 25 psi. boost on my PTE51 turbo. Maybe a bit more at the track rental next month.

I used an Industrial Automation solenoid to stage the second nozzle and a NAPA Hobbs type switch that was adjustable to turn it on.

Runs great on the street track times next month.

Ran 12.4 at 112 with the single nozzle and 23psi. boost last year.

15psi. seems a bit high for the initial turn on point.

 

[V8killR4U]

Well the single m-10 was working fine at 25 lbs of boost @ 26* timing. Tried to turn up the boost a bit more 26-27 and it knocked like crazy. which is understandable at 26* timing. So I figured I throw more alchy at it for those 27-28 lbs run so i can just hit a number "mid 11's" I figured the dual set up would cure that. Or you think i just need to swap out the the single nozlle and goto a bigger nozzle like the M-15. The staged setup like ummmm. "forgot his has" sounds like the ticket though.

Originally posted by Razor
Why are you using a dual nozzle?

 

[salvageV6]

If you want to you can buy a NOS alky. solenoid for $115 or so.

Proven to work well with alky., I haven't raced my Industrial Automation $45 solenoid so I can't totally recommend it yet.

NAPA has the hobbs style boost switch at 15psi. and you can adjust it up to 21-24 psi. turn on for your car.

Solenoid only takes about 1 ampere of current so I didn't bother with a relay, hobbs switch contacts are good for 10-15 amps. I believe.

Line from the bottle to a Y block or brass T and then a line to the solenoid and a line to your M10 nozzle.

From the other side of the solenoid a line goes to the M15 nozzle.

When you hit the adjusted hobbs switch boost the solenoid opens and the alky. flows to both solenoids.

Relatively easy install, hobbs switch has a 1/8" NPT port so you need a female 1/8" NPT fitting to a hose barb to connect it to boost.

I used a snubber diode accross the switch contacts to ground since the load is inductive from the solenoid coil. Low amperage so it probably isn't necessary.

 

[Razor]

Originally posted by V8killR4U
Well the single m-10 was working fine at 25 lbs of boost @ 26* timing. Tried to turn up the boost a bit more 26-27 and it knocked like crazy. which is understandable at 26* timing. So I figured I throw more alchy at it for those 27-28 lbs run so i can just hit a number "mid 11's" I figured the dual set up would cure that. Or you think i just need to swap out the the single nozlle and goto a bigger nozzle like the M-15. The staged setup like ummmm. "forgot his has" sounds like the ticket though.

Well you went from 10 to 25. That is 2.5 times the amount. And you wonder why your having probs. I would tell you try a single 15(50% increase) or go to twin 10's(100%) increase.

Only thing I dont like bout hobbs switches are the dead band issues, and theyre reliability. Adding a few of these.. adds fun to your tuning. Search for hobbs.. see what comes up.

More lines, more hoses, more fittings, more electrical= more headache.

My alky solenoids are half that amount fwiw.

 

[salvageV6]

You have alky. solenoids for $25?

How much is shipping on one?

Actually they are quite simple to install, no headaches.