2.5 Laser MAX HP vs 2.5 HORN

[vishus]

What is the max HP you can build out of a STOCK Laser EFI system?

How about a modified LASER EFI?
a) SVS
b) TREX style six/ten pack system

Is it worth the exspense to modify the LASER SYSTEM, or convert to a Horn EFI?

thx.sid

[RSM]

I don't know about what kind of HP the laser will support but I do know that putting the bigger butterflies in isn't that expensive RUCK put the next size up in mine and I could still go bigger. T-REX did an article on a wild mod to the laser sysytem I think it is on the BY-U-BOYS website. I bet Noah from Eagle One has played with this on his dyno and Tony B. should have the SVS figured out

[T-REX]

Dependz on what your look'in for????.....Tha Horn in stock form will outrun a XRI setup...Now, Use yo imagination, and tha XRI can be made to outrun tha horn!!!...

I had a complete horn set up I got for my pro 120 motor...I wuz runn'in tha 10pack(modified XRI)...I went to tha horn, and my combo slowed by 3/10ths...I sold tha horn to Chris Ray, he ran it on hiz pro 120 motor...He would pull me on top, but he looked at tha back ov my ole Chizler cowl for most ov tha track!!!...I then replaced tha 10pack wit a MADD 3 venturi intake, juss for test purposes...I had originally got tha front to use tha venturi on a XRI setup, but decided to try tha whole thang, juss fer ****z and giggles...It knocked off a 1/2 sec off my et...I run a Brucato PCU, so after tune'in and test'in, it even got better than that, to tha tune ov about 7/10thz !!!......Now, Chris went to tha same front, and we run neck an neck, but he alwayz had top end on me, and I had low end on him...and it should be tha other way around wit our port arrangements...

Now, I never got my hands on a SVS to try, never could talk Tony into lett'in me borrow one;) , so I kan't reely say how it would have panned out wit my combo...I will say this...Tha injectors in front ov tha reedz iz tha only way ta go!!, and tha straiter tha air flow, tha better.....Spacers help one motor and hurt anuther, so ya juss gotta go wit ya combo, and give it what it wants!!!....REX

[Promax1R]

I run a ProMax lazer style inj. setup with 1 1/2 spacer welded to front of intake just like the T-REX 10 pack, also a SVS mounted to it! I also have 1 7/8 butterflies installed in the intake.This setup runs VERY well!I am wanting to seal off the back butterflies and install vanes in the intake to pull air through the SVS only. it will be like a tunnel ram on a racecar. I will have to leave the lower throttleshaft to run the TPS. T-REX, do you think it will work? I am just trying to straighten out the incoming air. Ok experts give me your ideas.:D

[T-REX]

Never know what will work till ya try it...Tha straighter tha air flow, tha better tha top end numbers...REX:cool:

[Promax1R]

T-REX, do you think the SVS will pull enough air? The opennings are kinda small.

[Tony Brucato]

http://brucatosvs.com/bru5big.jpg

Chris Bond ran a ProMax SVS set-up on a Drag Motor in ODBA against real Drag Motors. I think they gave him a 70 lbs weight break, but he put a BIG whupin' on the rest of the field.
He used a Mercury 1 inch spacer behind the reed plate.

The way Chris used it and the way it's normally done, all cylinders can pull air from all opening at any time and no more than 3 cylinders are pulling air at a given time. If you segregate the reeds to individual SVS openings, I don't think you will flow enough air over 9000 RPM. That's not the way it was designed.

I'm working on a injector reed plate right now that will bolt behind a Drag Motor SVS. Now THAT will flow enough air.

[Promax1R]

Tony my SVS is mounted to a Lazer style intake with a 1 1/2 spacer welded to the front to make a bigger airbox. I want to close off the rear butterflies and pull air from the front only. will it work?

[Promax1R]

Tony, your engine is a BEAUTY! wheres the idle stablizer module?

[Tony Brucato]

I made a modified one for a guy a couple of years ago that had two more sets of velocity stacks mounted between the original three. He planned on closing off the rear ones as well.
Claimed that it worked fine.

Have you tried the Mercury 1 inch spacer? It really made a difference on mine.

[Promax1R]

I though the spacer was for 260"s ?

[Tony Brucato]

thanks PM1R, I threw away the idle stabilizer as I would recommend to anybody with a highperf ProMax. Just set the idle timing to 0° and WOT timing to 25° BTDC. The idle timing affects the bias circuit of the switch boxes and is not at all reliable.

the spacer is for the Drag Motor but all you need to do is elongate one of the botom bolt holes with a hack saw and use another gasket. You'll also have to do something with the idle bleed system.

[lloyd]

I have been playing with laser injection for 15 years. i made spacer plates for the air box between the reed plate and used the mercury spacer plate behind that, I have run this on 2.5 drag motors and 2.4 bridgeports and everything else even a Marvin motor that turned 8500 2.4. the trouble I had was pulling the reed plate gasket in at the top and bottom. I put the upper and lower bolts in it and took care of that. Its great up to 9500.

Lloyds Marine 812-424-5785
Evansville, IN.
Lloydsmarine@ aol.com

PS I have 1 set of spacer plates for sale. Air intake side.

[RSM]

Tony is that an old picture or do you still run your MERC ECU? How hard was it to get the fuel curve re-adjusted after the mods were done to your motor? Assuming SAUN from REPAIR did the work was he on the button the first time? I am just wondering how touchy the digital ECU's are? not knowing how much they can compensate/think for themselfs. The reason I ask is I am just finishing up my PRO-MAX build, was a 150hp and now around 200+ with the same ECU. Saun said he dose these all the time and can pretty much nail it by going off of what has been done to the motor. It just seams to me it would be more of a adjust/ re-adjust type situation than that. I know the idea way to go would be your PCU but thats not an option "this year" I still have to buy my whole interior and windshield yet and hope to get it on the water early this summer. Was not expecting the motor rebuild so sone but close inspection of the motor dictated other wise. THANKS! Randy

LLOYD I am from FT. WAYNE IN. good to see more Hoosiers on here. You sure havn't posted much for registering in 2002

[YELLOWSS]

man i hope you can help me. i have a 2.4 b/p originally a efi motor. i bought it as a long block. i'm setting up a lazer injection on it with a 1" spacer. i have the 7 petal front 145lbs comp. land & sea dual plug heads. this motor turned 8500 with a simalr lazer on it before rebuild. i need to know which ecu to run, mild porting exhaust opened up. i'm going to turn it no more than 8000
roy:confused:

[Tony Brucato]

In these non-factory configurations an adjustable ECU is the only way to go. I originally used the factory ECU modified by Rapair on this ProMax, as well as trying an old ModVP box, A48, A63, and several other Mercury boxes. I would use an adjustable fuel pressure regulator to change overall fuel delivery.

I finally tried a Simple Digital System from Wayne Taylor. Man what a difference the correct fuel delivery makes! Top speed was up, acceleration improved, idling was smooth.
This was before I made my own ECU and it inspired me to build our own "Pro Control Unit".

One thing was for sure. I would never run a stock non-adjustable ECU on a modified motor again. It's really almost impossible to calibrate an ECU "on the button" for a modified motor via UPS.