Volt booster VS Volt booster

[TURBOPOWERED68]

many say its not needed -thanks .
But for those who do need/want one lets talk.

Boost Activated = At a predetermined boost signal it activates --while in/under boost.
You get the voltage when you need it.

TPS signal activated = At a predetermined TPS signal it activates --Before boost.
You get the voltage before you need it.

which one do you have/would get and why?

 

[toomanymodz]

I bought a Kenne-Bell volt booster, which boosts the voltage to my fuel pump to 17.5v. It comes with a pressure switch and only activates under boost. I currently don't need it since I'm only running 19# of boost. I'm near the output limits for a single Walbro pump, so if I decide to crank it up to 25#, I'll go ahead and install it. For the record, at 19# of boost I'm seeing 70% duty cycle with 80# injectors (which equates to around 93% on 60# injectors).

 

[toomanymodz]

And I'm not familiar with the TPS-activated. Hooking up the boost-activated switch is extremely simple...I plan on using the line that used to connect to the charcoal can (which most people have long since tossed).

 

[jasjamz]

The TPS style. When I had my 6765 boost went from 10 psi to 31 psi in one second. The TPS style would have turned the system on full blast before the boost really hit. If you have a car that spools like a snail then I guess either would be OK. Just my 02.

 

[TURBOPOWERED68]

The TPS style. When I had my 6765 boost went from 10 psi to 31 psi in one second. The TPS style would have turned the system on full blast before the boost really hit. If you have a car that spools like a snail then I guess either would be OK. Just my 02.

thats what i was thinking, now not to sure.

looking over my PL files--
3.36 TPS @ frame #37.168 = 6.8 PSI
and WOT
4.79 TPS @ frame # 37.416 with 12.0 PSI
this was coming up on the gas slowly at the track while trying to hold the car back.
it doesn't seem to be a significant time lapse between the 2 types of V-Boosters
i guess that from idle to WOT or cruising with out a load would be the most noticeable difference
Math guys help me out - 4.79 being WOT, What does 70% throttle equal in signal volts?

 

[RmvBfrFlght]

Math guys help me out - 4.79 being WOT, What does 70% throttle equal in signal volts?

3.48 volts @ 70% TPS, based on .42 V throttle closed.

(4.79 - .42) * .70 + .42 = 3.48 V

Note that the stock GM ECM shuts down the quad-driver outputs once the system voltage at the ECM goes over 17.1 volts.

RemoveBeforeFlight

 

[jasjamz]

You're overthinking this. Either its working at full throttle or it isn't. If your trans doesn't have full line press all the time you shouldn't be playing around with high boost at part throttle. Thats a quick way to kill the clutches. If you have a Turbo Tweak chip it does not want to see more that 4.8v at WOT. You're on the ragged edge there. Back it down. Are you building boost gradually eighths pedal at the line or do you mat it and launch when you see your desired boost or RPM?

 

[turbobitt]

FWIW - I built my own volt booster using one relay and two resisters that is controled by the FAST XFI analog output channel and is turned on by setting Min TPS and Min boost. So in my case, I set to 65% throttle and 275 KPA Boost. Needs to meet both criteria to be activated.
I played with the resister values to get me to 16.3 volts. Didn't want to be any higher than that.

Allan G.

 

[TurboBuRick]

FWIW - I built my own volt booster using one relay and two resisters that is controled by the FAST XFI analog output channel and is turned on by setting Min TPS and Min boost. So in my case, I set to 65% throttle and 275 KPA Boost. Needs to meet both criteria to be activated.
I played with the resister values to get me to 16.3 volts. Didn't want to be any higher than that.

Allan G.

Are you boosting pump voltage or all the cars power?

 

[turbobitt]

Are you boosting pump voltage or all the cars power?

All car power. That is why I self-imposed the 16V limit. The XFI and pump can handle it. The light bulbs and fuel sender are marginal.

Allan G.

 

[toomanymodz]

I like the idea of only bumping up the voltage to the fuel pump. Whole-car volts would make me nervous.

 

[turbobitt]

I like the idea of only bumping up the voltage to the fuel pump. Whole-car volts would make me nervous.

- Fuel pump
- Ignition
- Injectors
These would be the three that I would crank up the voltage on. You can isolate these circuits somewhat easily but in my case, with very little voltage sensitive devices, may as well power up everything and keep it simple.

Allan G.

 

[TURBOPOWERED68]

FWIW - I built my own volt booster using one relay and two resisters that is controled by the FAST XFI analog output channel and is turned on by setting Min TPS and Min boost. So in my case, I set to 65% throttle and 275 KPA Boost. Needs to meet both criteria to be activated.
I played with the resister values to get me to 16.3 volts. Didn't want to be any higher than that.

Allan G.

can you give me a part# on the Resisters?

 

[turbobitt]

can you give me a part# on the Resisters?

The resister values will change depending on your alternators charging target. For example, my alternator tries to maintain 14.1 volts where others are at 13.7. I am attaching a quick drawing of mine and some calculations for the resister values. This drawing is for wiring into FAST XFI.
Allan G.