highspeedspecialist

I'm deciding between the msd booster or the kenne bell one. Both are about the same price. The msd puts out 22v max and the kenne bell only 17.5.

onfire

iTrader: (17)

I like the KB. 17.5 is the max on a walbro without cavitating the pump.

MIGHTYMOUSE

iTrader: (59)

speed sells a tps driven box that ups the enitre voltage to your car 2.2volts for liek 65 bux made by caspers electronics

kp

iTrader: (34)

I'm going to go pick up the MSD one now so we'll see You can adjust the MSD to come in gradually. I had a KB in one of my other cars but I didnt like the way it 'hit' when it kicked in. I was also confused since it was a 40 amp unit and only had a 20 amp fuse, didnt like the extra **** either - maybe I'm just too picky

I'm a little worried on the current rating of the MSD with the Racetronx pump but since Jack from Racetronix has recommended the MSD unit several times I'll give it a go and see. Find out tonight if it works

highspeedspecialist

okkk let me know

Caveman

iTrader: (2)

I was planning on doing one of those myself please post about it in a day or 2, thanks.

kp

iTrader: (34)

Well here you go. All I did was put the MSD voltage booster on and gut the pulse damper in the rail Gutting the pulse damper really never made that much of a difference for me but every little bit helps

Anyhow, it definately worked, if you look at the pics (they may not be in order) one was from a couple days ago, the a/f was 15:1 at ~6500, lucky I had some race gas in it for the initial voyage. Notice the injector % on the lower left.

Not touching the tuning with the votage booster it was way too rich and blowing out black smoke (10.0 is as low as my WB reads) so I didnt bother running it up too high. It definately did something.

Last one is knocking a whole 20% off my PE vs RPM table as a guess. Just a tad lean up top but I think this will work - not really into street tuning a car like this so I'll hit the dyno this weekend.

It seems to work OK but I was under the impression that it wouldnt raise the voltage unles it was 5psi of boost like a KB. I have the control only turned up like 25% and when the car isnt running its at 16v and with vacuum its at around 15 volts. My mityvac is busted so I cant see what it does under boost but I'll borrow one in the next couple days. I dont know if running the pump at 15v all the time is going to hurt anything, sure makes that Racetronix pump sing though.

Thre is plenty more adjustment on the MSD if I need a little more but onfire mentioned the walbro cavitates at 17.5v so going over that may hurt more then help. Found a nice out of the way spot to mount it and it certainly helped some, so for now I'll call it a success. I'm sure if I crank the PE up a little at high RPM I'll get it where i want it to be - find out in a couple days on the dyno if it will keep up..

Caveman

iTrader: (2)

Thanks for the info. Maybe you can get to the track soon and see what it will do , who cares about dyno #s. I have not run my race car for 6 months had to save $$, hoping I can have it done for the HPP shootout .

kp

iTrader: (34)

As usual its supposed to rain this weekend but that changes every 5 minutes. Its just easier to deal with the a/f on the dyno the first time (less distractions) but to be honest I'm working in such a narrow window (5000-6500rpm pretty much) its no big deal to get the tune down at the track with the flashscan black box and wideband. I'm not really concerned with the dyno numbers at all, it doesnt have the drivetrain to be a dyno queen thats for sure.

kp

iTrader: (34)

figured I'd move this here instead of the FI section

Wet 1

iTrader: (4)

What was involved with installing the MSD BAP? How long did it take as well? I'm starting to max out my Racetronix and need more fuel.

kp

iTrader: (34)

Took me about an hour. Racetronix wants in the back of the car with their harness. Since the MSD box draws more current then it can put out I wanted it as close to the battery as possible. I just used the Racetonix harness and didnt use the relay MSD supplied, its only four wires (two grounds) to hook up so its no big deal. It may drain the battery after a while the way I have it and may have to use the relay but I'll see.

Wet 1

iTrader: (4)

Thanks, I just ordered the MSD.

MIGHTYMOUSE

iTrader: (59)

hellooooo...

Caspers
V-Plus Volt Booster
Your alternator is designed to put out a specific voltage, generally 13.8 volts. The only problem is when there's a greater demand on the electrical system, such as a WOT blast, the alternator falls a little short. The V-Plus is designed to overcome voltage taper at WOT by stepping up the alternator voltage 2.2v. at 70% throttle. Result? More power to your fuel pump and ignition system. Unit plugs in, with no wires to cut or tap into. Includes hardware.

CSP102130 LS1 V-Plus Volt Booster $69.99

http://www.ls1speed.com/catagory.cfm.../%20Electrical

kp

iTrader: (34)

I have never had good luck with LS1 alternators at higher RPM so I dont want to trust my motor to the alternator's whim. Nice thing about the MSD and KB BAP they will put out the same voltage even if the input voltage drops to 11v, they will just draw more current.

Plus I can crank this up to 19v with 11psi if need be and it affects nothing but the fuel pump.

To each their own

MIGHTYMOUSE

iTrader: (59)

if your alt is weak enough to drop to 11 under load, it is also weak enough to not handle the amp draw required to sustain the msd at 19v.

just trying to save you some cheddar

kp

iTrader: (34)

chedder is already spent

I used something similar in one of my old GNs many years ago, worked I guess but there want much else out there.

If the fuse and the wire on the input side is big enough to handle the current load it will put what ever it is set to. I would bet if the stock alternator stopped charging the output of this wouldnt change much, couldnt say that for the other one. Thats the nice thing about a regulated DC-DC converter as oppsed to upping the field voltage on the alternator. They both work, but I have had 2 LS1 alternators fall apart at higher RPM so I prefer not to rely on it That doesnt mean this thing wont stop working in the middle of a pass either so you never know

S_J_H

I just ran my car with NO alternator when the belt flew off. Just a lightweight batt powering everything.
Not exactly good for performance.
Anyhow, I like the MSD and KB units.
But If you wanted full 22 volt power with no amperage restrictions, just run a small 6 volt batt in series with a SPDT relay directly to the pump. Well actually the only restriction would be the relay used and wiring. But more than enough for any pump on the market.
Some of you may remember when I used to do this moons ago on tech-ls1.com.
I ran that system for a couple of years without any sort of issue.22+ volts to the stock 98 pump for at least 100 runs. Still have that pump and it never missed a beat.

It's a 30$ mod that worked incredibly well.

Steve

Inspector12

iTrader: (29)

Hey some one showed you my pics LOL! That is where I mounted mine lol! funny how alot of us think alike. Looks good and looks like it is wokring for you .

Racetronix

iTrader: (2)

The MSD unit is suppose to plug into the Racetronix harness after the relay with the connector set supplied. Do NOT deviate from this procedure. The system is perfectly thought out and there is NO reason to change the layout!