MSD boost referenced boost-a-pump for alky pump

[fluff]

I was thinking of a way to increase alky flow as the boost goes up. Instead of going with a staged kit, I would go with the boost referenced BAP from MSD. Has anyone tried it? It says 30 psi on the unit, so I think it would work well for you single stage alky guys.

I know I'm a newbie. Just to fill you guys in on who the hell I am, I own a supercharged 3.4 L tacoma. We don't have intercoolers avail for our trucks w/o full fabrication, so I want to show everyone in the taco world the full potential of alky injection and maybe try Jay C's new propane kit.

Jay C and Nelson used to work on my TTA back in 96-98 here in Florida. It ran mid to high 12's with a stock fuel system and no alky. Jay was trying to talk me into the alky back then, but I was ignorant on the issue. Now that i don't have an I/C, I'm very interested.

Cool Site,
Chris Henderson

 

[ACLR8R]

Good to have you onthe board. What does your truck run? What kind is it (Prerunner, 2wd, 4wd)? My friend had an S-runner with the supercharger and a smaller pulley, 3.90 gears, FIPK, it was a real fun little truck!

 

[blackbuick87]

I dont quite understand what youre proposing. You want to use a booster pump at high boost to get more flow? I dont see how a 30psi pump is going to help a 90psi pump too much, if thats what youre saying.

How much boost are you running with this supercharger? It would have to be quite a bit to benefit from something like this

 

[fluff]

I have an 02 prerunner TDR. It has a push button locker on 4.10s that comes in handy in a race. It also has a stock auto tranny that robs lots of HP. I can build it up, but I want to blow it up first. I have 85k miles left on my warrantee, which the SC doesn't void. It run 15.5 @87 with a 2.3 60' time and 6-7 lbs of boost. I'm not even going to waste my money on a boost guage for that thing, that's why I'm looking at an EGT guage. If I do an alky nozzle, I could stick a temp probe in there when I go to the dealership for my scheduled maint. That wouldn't void the warrantee.

Split second has a piggy back fmu that's just being released. It will allow bigger injectors, MAF, 3D timing and fuel maps, extra injector(s) and some other stuff. It's all laptop programmable and goes for under $600. So that's what I'm going to use to run stoich with the alky.

The boost-a-pump increases the voltage to the pump based on boost. It goes up to 22 volts at 16 psi but says 30 psi on the outside of the box. I think that's the max curve. I saw it in turbo mag.

 

[blackbuick87]

I dont know if its necessary to go through all the trouble for 6-7psi. Maybe at 12-13 psi...
I think a standard SMC would do fine and save you the headaches

 

[fluff]

The SMC kit and a 9 then 11 psi pulley (if the alky will allow) is what I have in mind first.

I do want to tune it to run at the stoich up the rpm band. The boost-a-pump will be the first thing to modulate the alky flow based on boost. Then, if I need more fuel, which I prolly will at 11psi or higher, I'd add an extra injector. Then it would all be tunable with the SS unit. I'm sure you agree, owning a turbo buick motor, that tuning is very important.

The truck leans out as is, that's right, Toyota denys it, but everyone on tacoma territory agrees that the fuel pressure drops off at WOT in top of third and into 4th when the load is high around 90 mph. I can feel it die off and lean out under my foot, if I back off to 80-85% throttle, I'm fine and it starts creeping up. That's why I think my setup is a perfect candidate for alky. I want to be able to drive at full throttle for hours down the highway (big alky tank), and not have to worry about melting down, which would surley happen if I didn't have a speed limiter.

I really appreciate your advise. It's nice to chat w/people who really know how to go fast. Thanks

 

[blackbuick87]

Does the fuel drop off because of the pump? May want to consider a better pump with a hot wire to the alternator

 

[fluff]

Yes it does. The stock pump is only like 130 lph. Guys that go with the 190 walbro still have problems though until they up the injectors from 230 to 275 or 305. The injectors are at 83% duty cycle which is as much as I want to go. The pump can only do so much with those injectors. I think a 190lph pump and alky injection would do the trick up to 9 psi. I want the alky to pick up where the stock fuel system drops off.

 

[fluff]

And I'm also considering the extra injector with tolulene setup. That can all be run and tuned with the SS unit.

 

[Racetronix]

Originally posted by fluff
The boost-a-pump increases the voltage to the pump based on boost. It goes up to 22 volts at 16 psi but says 30 psi on the outside of the box. I think that's the max curve. I saw it in turbo mag.

FYI a Walbro GSS340 pump will reach max output at about 17-18 volts. Any more than that and the pump starts to cavitate and the output will drop. The highest recommended voltage is 16 for maximum reliable output.

Jack
Racetronix

 

[fluff]

Thanks for the advise Jack. Is that walbro the pump that comes with the SMC kit? If not, does SMC's pump handle the voltage? Thanks

 

[Turbo__Tim]

I like the idea of modulating the alchy spray. With voltage to the pump is interesting.....

Annother way is to use a high speed valve from Aquamist ($150) that uses injector pulses, so the modulation is done by RPM. I havn't tried it yet, and don't know anyone that has.

As far as alchy injection as a whole, you want `100 psi for a pump, small nozzles, and 2 stage. (or modulated). It has been shown many times that the finer the mist, the better the results. (A more homogenous mix) The finer mist allows a higher concentration of water, which is really what cools the internals.

You could also use MSD's rpm modules that allow the spray to turn off, and on according to rpms. This would stop you from flooding, and loosing power right after the shifts when the rpms drop, but the alchy keeps flowing.

I adapted the SMC kit to 2 stage using aquamist parts. Cost $200 to do this. It is great to be able to adjust the turn on point (for the first stage) and pump speed (both stages). So far this has worked really well.

I almost tried the high speed valve from aquamist, but got sidetracked with propane injection. (see the post about 15-20 threads down).

Whatever you decide, get a high psi pump.

Let us know how you make out with the modulated thing. Nobody I know of has used it, but I'm sure it is the best way to go.

Except propane ijnjection, maybe...

Good luck!!

 

[fluff]

Great info. Thanks. I may be holding my breath for propane. I want to see what results you guys get. Does Jay's kit modulate the propane flow based on rpm, load, boost? If I did propane, I doubt I'd ever need another fuel upgrade which would be very nice.

I also have another thread going on what you guys think is the best alky kit. uve prolly seen it. I dunno what do do

 

[fc227]

I'm working on a variable speed vs boost setup. My setup is carbed But I run 22# boost on C16, But I have a working prototype of a variable speed pump control, as Boost goes up so does the pump speed.

It uses a three bar map sensor that electronically turn the pump on and there is also a base line adjustable pump speed and pump on settings.

I'm just waiting to get some track time to really test it.

I did try up at Epping a couple months ago. It was hot out (90°), I had the pump come on at 18#'s and the pump speed set at Min. and still running C16 fuel. It picked up 2MPH though the trap's. Because of the intercooling action.

However, I don't have anywhere around where I live to really "test it” because there is too much traffic & police activity.