Getting everything possible out of a sovp...... Drag truck build/questions with pics

[98silver12v]

Current setup on my 2000 vp drag truck is:
Edge Competition juice with attitude
.093 connecting tubes
Stock lines
Stock sovp (possibly cracked diaphragm)
Fass 150
Fuel cell
Industrial injection 6x.016 injectors
Htt htb2 62 over a bullseye s480 with a race cover
On3 performance inter cooler
Head studs
Stock head gasket and internals
Dropped rear end 6.5 inches with a leaf under the axle conversion (trying to dial in my launch and take off at the track and get better 60' times)
Ats 2wd trans with a modified dtt fuel manual valve body with a ratchet shifter
Truck last weekend went 11.93 @116 mph in the 1/4 (1.9 60 foot)
And have dynoed a best of 749 hp last year
Truck weighed 5800 pounds with me in it last weekend when I ran the 11.9
Trying to push a stock vp as far as possible before upgrading it it seems like going down the track it would clean up out of the hole and stay clean the rest of the track is my vp limiting the fuel or is my lines injectors etc. limiting the fuel seems like I'm pushing plenty of air for the setup currently and would like to squeeze out anything possible IF possible. Just currently picked up locally a set of .093 connecting tubes set of .093 vp44 lines and a set of 6x.018 injectors all industrial injection products ....... My question is changing the injectors or lines to a little bigger am I going to see any changes........ Looking for guys that have possibly ran bigger lines with possible stock vp..... I've been told not to run them that you make more power with stock lines and the truck doesn't like to idle with the bigger lines and you need a bigger vp pump to feed the bugger lines..".....I've read more things that say don't run them over people saying to run them , anyone got personal experience with anything similar and care to share there experience /pros vs cons
On the injectors I've been told I'm running too big of an injector as is right now for a stock vp and that a 6x.018 won't help anything .....anyone tried or had good luck with a bigger setup like this with the limitation of a stock vp? Again pros vs cons
Any expert vp guys out there can explain what the vp 44 is doing IF it truly does have a cracked diaphragm...... I have hard to start issues more so when the truck I'd hot or been ran hard he se the reason I think I have a cracked diaphragm is this returning fuel that normally would be being pushed to the injectors through the crack? In other words am I loosing power/fuel to the injectors because of the cracked diaphragm?






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[jasonc]

Either pay the money for a sketched out vp, or go to another injection option.

[98silver12v]

Got plans to p pump it when/ if the time comes (got a front cover adjustable timing gear and bigger p pump lines just got to get a p pump built that's sitting on the shelf but happy with the way the truck is running right now with the vp for the most part so I will play with what I have for now before making a "big change " to a p pump


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[98silver12v]

Originally Posted by jasonc

Either pay the money for a sketched out vp, or go to another injection option.

Are you saying my pump either way is the issue....? Or hinting towards just p pumping it?


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[jlbayes]

Make the truck lighter. I do not see larger injectors of questionable design or larger tubes & lines helping you.

[ehines218]

Get that thing to launch. With a 6800 lbs 4wd truck on 22's im cutting 1.6-1.7 second 60 ft times

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[98silver12v]

Originally Posted by ehines218

Get that thing to launch. With a 6800 lbs 4wd truck on 22's im cutting 1.6-1.7 second 60 ft times

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Trying to work on the launch is currently I was cutting 1.9 60' times with stock suspension rear end
Set year so this was the first time out with the different rear end setup which still cut a 1.8 or 1.9 60' in the burnout box the rear end would start to hop will trying to heat up the tires at first trying to figure out how to fix this to heat up the tires better


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[weazel]

Yeah don't run those bigger lines. I gained a few ponies by switching back to stock lines. I did keep the .093 tubes in, but went back to stock lines.

I ran big lines years ago on an SO.. loped hard as hell. Sounded cool, but gained nothing, didn't feel any more powerful, didn't really gain anything.

[maxwedgehead]

My 03 half ton weighs right at 5440 with me in it, and has a 28x10x17 slick on it, not a giant tire like you have and it'll do 1.78-1.80 60 foots all day and has been 11.71 at 116 and will nearly go 11.70s every time at 116-117, What gears are in the rear? If its 3.55s with that tall of a tire you might be losing instead of gaining.

[Mudn_1]

60 ft..... get that thing 1.5x and you will go quite a bit faster.

[Big Blue24]

I say try the injectors and lines, what do you have to lose at this point if you already have them. If it goes slower MPH, you'll know you lost average HP.

Or, drive it down here to Cedar and throw in on the dyno before and after the injector and lines swap and see what happens. Heck, we can even do simulated 1/4 mile runs with the slicks on the dyno and see what it will do with a real 60' time (we'll strap her down tight enough to do a real launch!!!)

I know back in the day, the big power VP guys tried several different stock SO VP44's till they found a "freak" that would flat out fuel hard. Then they invented the Hotrod pumps, Blue Chip Pumps, then the Monster Pumps, then the Dragon Fire II pumps, etc. and the fun of musical pumps went downhill quickly.

In my mind, if it's cleaning up all the fuel, I'd try adding more lift pump pressure on a pass to see if it goes faster with more feed pressure. Experiment and see if anything can be found. Maybe set the Edge to a lower power level and see if it picks up MPH, even if the lower tunes won't do high RPM fueling, you can still compare 1/8th mile MPH to see if it's picking up power at the lower RPM ranges before it becomes gearbound on the big end.

[01silver bullet]

In my experiences with the Sovp stuff, that 749 is a damn good number on that pump and I don't think you have any thing left out of that pump. In fact that's one of the highest numbers I think I've seen on a Sovp cause I think mine held the record on fuel only for a while at 697hp, I tried 093 lines and tubes and hated them, the problem with the vps is we don't have enough timing right? That bigger line I believe takes a little timing away.. And the characteristics if the truck suck! My truck would die every time I put it in gear or it would lope so hard you had to be on the brakes hard it just sucked. Granted my converter was a little tight. But I agree with will go down and put it on the dyno and try your parts one at a time! Sometimes the vps react to methanol better because it acts as a fuel and helps when your so limited. Also you want to be careful what you choose for tire size for your gear ratio because your really out of fuel around 32-3500 rpm with a vp. Do you have a redline box? I had good luck with one in mine. I also agree your 60 ft times are terrible, I like the Caltrac style bars on the 2wd trucks that may help! Sorry if all this doesn't make sense I just woke up and started reading! Lol

[jlbayes]

There are not gains to be had in increasing inlet pressure. Just a pissed off pump that won't want to start from fuel lock. Internal vane pump will trump whatever you feed it. No use in trying to force anything else in there. A good solid 20psi at high volume with less chance in over heating the fuel.

[8UPRACIN]

Suspension tuning and getting it launch is key right now. I know your making good power it's just got to put it down now and stick. Keeping making little changes, tire pressure, launch psi and see what is going to work.

[diesel_importer]

Those numbers are bad a$$. Mine with the monster pump and 467 was still only 650 maybe. Best on fuel 11.85 with low 1.7 60'. 50 shot of nitrous on a single pass yielded an 11.58.
Get your launch down.


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[Justappumped24v]

8upracing is the real deal on VP44 been following him on IG forever. Quite incredible to be honest. Either way good luck... should be easy to shed more weight though. Poly seat... fiber glass hood, gut the inner fenders, loose the toe mirrors

[98silver12v]

Originally Posted by maxwedgehead

My 03 half ton weighs right at 5440 with me in it, and has a 28x10x17 slick on it, not a giant tire like you have and it'll do 1.78-1.80 60 foots all day and has been 11.71 at 116 and will nearly go 11.70s every time at 116-117, What gears are in the rear? If its 3.55s with that tall of a tire you might be losing instead of gaining.

How hard are you launching? Two wheel drive?


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[98silver12v]

Originally Posted by 01silver bullet

In my experiences with the Sovp stuff, that 749 is a damn good number on that pump and I don't think you have any thing left out of that pump. In fact that's one of the highest numbers I think I've seen on a Sovp cause I think mine held the record on fuel only for a while at 697hp, I tried 093 lines and tubes and hated them, the problem with the vps is we don't have enough timing right? That bigger line I believe takes a little timing away.. And the characteristics if the truck suck! My truck would die every time I put it in gear or it would lope so hard you had to be on the brakes hard it just sucked. Granted my converter was a little tight. But I agree with will go down and put it on the dyno and try your parts one at a time! Sometimes the vps react to methanol better because it acts as a fuel and helps when your so limited. Also you want to be careful what you choose for tire size for your gear ratio because your really out of fuel around 32-3500 rpm with a vp. Do you have a redline box? I had good luck with one in mine. I also agree your 60 ft times are terrible, I like the Caltrac style bars on the 2wd trucks that may help! Sorry if all this doesn't make sense I just woke up and started reading! Lol

Thanks for the advice and input yes the plan is to get the 60' figured out and the truck tuned in better for sure I don't have a red line box all I have for tuning is a new edge products competition juice that fuels harder and to higher Rpms . As far as tire size and gearing I just got lucky and found a local dragster guy that was getting rid of a couple sets of his old Hoosiers so I picked them up from him for cheap as I'm trying to stay on a low $$ budget as much as possible, this is why I wanna push the setup I have as much as possible without making a huge leap to a BIG vp or PPUMP just yet and this stuff will come either by force by breaking parts or coming across a good enough deal to purchase some items


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[98silver12v]

Originally Posted by 8UPRACIN

Suspension tuning and getting it launch is key right now. I know your making good power it's just got to put it down now and stick. Keeping making little changes, tire pressure, launch psi and see what is going to work.

Currently I was trying to launch at 12 psi and still felt like I wasn't getting a solid hook out of the hole I know my burn out to heat up the tires needs improvement. Hoosiers are around 14 psi in them without tubes. I left at 15 psi the last run and it for sure spun pretty hard and still went a 1.9x 60 foot


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[98silver12v]

Originally Posted by Big Blue24

I say try the injectors and lines, what do you have to lose at this point if you already have them. If it goes slower MPH, you'll know you lost average HP.

Or, drive it down here to Cedar and throw in on the dyno before and after the injector and lines swap and see what happens. Heck, we can even do simulated 1/4 mile runs with the slicks on the dyno and see what it will do with a real 60' time (we'll strap her down tight enough to do a real launch!!!)

I know back in the day, the big power VP guys tried several different stock SO VP44's till they found a "freak" that would flat out fuel hard. Then they invented the Hotrod pumps, Blue Chip Pumps, then the Monster Pumps, then the Dragon Fire II pumps, etc. and the fun of musical pumps went downhill quickly.

In my mind, if it's cleaning up all the fuel, I'd try adding more lift pump pressure on a pass to see if it goes faster with more feed pressure. Experiment and see if anything can be found. Maybe set the Edge to a lower power level and see if it picks up MPH, even if the lower tunes won't do high RPM fueling, you can still compare 1/8th mile MPH to see if it's picking up power at the lower RPM ranges before it becomes gearbound on the big end.

thanks for the response and advice will i will have to try and mess with some things little bit at a time. how hard are you leaving in the junker? seems to me if i remember right you are right around the 1.8 1.7 60 foot mark in yours.... also have alot more power to put to the ground then me