Boost a pump adding power ?? What am I missing. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

curtmgulla · 03-14-2018, 09:40 PM

I also posted this on the HP tuners fourm.
Ok car is a 2013 zl1. Upper 2.4 pulley id1050x injectors.. tap headers.. no cats...tr7ix plugs cold air intake.

Ok so before "JMS boost a pump* my AFR was pretty stable. 11.4-11.5. But fuel pressure would go from 65psi to 44 by 6k. Power felt good.. so I thought.....pulled strong.

So I added the "JMS". And here is the "off" part. "Abadzl1* is doing my tune. We expected my AFR to go rich as fuel pressure is now steady at 65. But it stayed 11.5. But Holy Crap!!! the power increase. It pulls so hard and smooth through out the RPM band.

It feels like a completely different car.
How does making fuel pressure steady add hp? What do I not understand. ?

JB'sZL1 · 03-15-2018, 06:02 AM

You were running 1050's on solely the stock fuel pump?

acammer · 03-15-2018, 06:09 AM

Quote:

Originally Posted by curtmgulla

I also posted this on the HP tuners fourm.
Ok car is a 2013 zl1. Upper 2.4 pulley id1050x injectors.. tap headers.. no cats...tr7ix plugs cold air intake.

Ok so before "JMS boost a pump* my AFR was pretty stable. 11.4-11.5. But fuel pressure would go from 65psi to 44 by 6k. Power felt good.. so I thought.....pulled strong.

So I added the "JMS". And here is the "off" part. "Abadzl1* is doing my tune. We expected my AFR to go rich as fuel pressure is now steady at 65. But it stayed 11.5. But Holy Crap!!! the power increase. It pulls so hard and smooth through out the RPM band.

It feels like a completely different car.
How does making fuel pressure steady add hp? What do I not understand. ?

What was the duty cycle like before and after on the injectors?

03worthy4link · 03-15-2018, 06:14 AM

Proper fuel atomization. Injector spray is as designed at the target PSI, same quantity, different quality.

curtmgulla · 03-15-2018, 06:35 AM

Yes I was running stock fuel pump but the id1050x... duty cycle before at wide open throttle at 6000 RPM was about 62% now it's 50% but a 10% drop...

acammer · 03-15-2018, 08:01 AM

Quote:

Originally Posted by 03worthy4link

Proper fuel atomization. Injector spray is as designed at the target PSI, same quantity, different quality.

Bingo.

robrocketanski · 03-15-2018, 12:16 PM

I have said for years (to myself mostly) that they run out of fuel and hp not just lean out and melt. That's why people say they may or may not need a fuel pump voltage booster because they just leave a little power on the table.

When I first finished my car I had it on a dyno without the JMS plugged in. The car dynoed fine and power was less than expected at 600 whp. Then the car did 10.8 at 129 which for a convertible is pretty impressive on 600 whp. I am sure it was more once the JMS was plugged in.

JB'sZL1 · 03-15-2018, 12:27 PM

Quote:

Originally Posted by robrocketanski

I have said for years (to myself mostly) that they run out of fuel and hp not just lean out and melt.

Just for argument's sake:

It seems like you're saying it's ok to run on a stock pump with 1050's and 600+ rwhp.

I don't think the op was running 10.8 at 129. Running out of fuel at wot can be catastrophic. I think $1k (BAP) or $4k (Fore pump and rails and 1050's) is cheap insurance to avoid that catastrophic failure. A rebuilt LSA will certainly cost more than that.

Just saying: I would not advise running 1050's w/o an auxiliary fuel system of some level.

crazydave · 03-15-2018, 12:40 PM

Quote:

Originally Posted by curtmgulla

I also posted this on the HP tuners fourm.
Ok car is a 2013 zl1. Upper 2.4 pulley id1050x injectors.. tap headers.. no cats...tr7ix plugs cold air intake.

Ok so before "JMS boost a pump* my AFR was pretty stable. 11.4-11.5. But fuel pressure would go from 65psi to 44 by 6k. Power felt good.. so I thought.....pulled strong.

So I added the "JMS". And here is the "off" part. "Abadzl1* is doing my tune. We expected my AFR to go rich as fuel pressure is now steady at 65. But it stayed 11.5. But Holy Crap!!! the power increase. It pulls so hard and smooth through out the RPM band.

It feels like a completely different car.
How does making fuel pressure steady add hp? What do I not understand. ?

Are you compensating for boost pressure with you FP readings? 44 PSI under 13 psi of boost is really on 31 psi at the injector tip. I can see with increased atomization how you would feel a pwer increase.

Can'tHave2MuchHP · 03-15-2018, 01:13 PM

Quote:

Originally Posted by 03worthy4link

Proper fuel atomization. Injector spray is as designed at the target PSI, same quantity, different quality.

This. This. This and This. This is a very important point that MANY of us, myself included, forget about from time to time. Pushing the limits of fueling is going to cause problems, even if the car seems to run fine. Fueling parts were all designed to run at a certain PSI. This is why I have a problem with cars running 10% or heaven forbid 18% pulleys on stock injectors, besides the possibility of actually blowing the engine, you just miss out on power and stability of the engine that it will attempt to fix with timing and the like.

ABADZL1 knows what he's talking about, I'd trust him.

curtmgulla · 03-15-2018, 01:53 PM

All I can say is I am amazed. The car felt like it picked up some power after all the mods... but still felt closer to stock feel it didn't really feel like what I added I got a big benefit from.. and always felt like from 4500 RPM on up the power kind of planed out... it was still pulling but didn't have that hard pull fill to it..... It feels like I added a hundred shot of nitrous to it in all reality no jokes aside the car feels so different.

ZO6 Bryan · 03-15-2018, 07:43 PM

Quote:

Originally Posted by curtmgulla

I also posted this on the HP tuners fourm.
Ok car is a 2013 zl1. Upper 2.4 pulley id1050x injectors.. tap headers.. no cats...tr7ix plugs cold air intake.

Ok so before "JMS boost a pump* my AFR was pretty stable. 11.4-11.5. But fuel pressure would go from 65psi to 44 by 6k. Power felt good.. so I thought.....pulled strong.

So I added the "JMS". And here is the "off" part. "Abadzl1* is doing my tune. We expected my AFR to go rich as fuel pressure is now steady at 65. But it stayed 11.5. But Holy Crap!!! the power increase. It pulls so hard and smooth through out the RPM band.

It feels like a completely different car.
How does making fuel pressure steady add hp? What do I not understand. ?

Quite simple. Better atomization of the fuel at 65 psi

03-14-2018, 09:40 PM	#1
curtmgulla Drives: 2014 corvette Join Date: Oct 2016 Location: tn Posts: 36	Boost a pump adding power ?? What am I missing. I also posted this on the HP tuners fourm. Ok car is a 2013 zl1. Upper 2.4 pulley id1050x injectors.. tap headers.. no cats...tr7ix plugs cold air intake. Ok so before "JMS boost a pump* my AFR was pretty stable. 11.4-11.5. But fuel pressure would go from 65psi to 44 by 6k. Power felt good.. so I thought.....pulled strong. So I added the "JMS". And here is the "off" part. "Abadzl1* is doing my tune. We expected my AFR to go rich as fuel pressure is now steady at 65. But it stayed 11.5. But Holy Crap!!! the power increase. It pulls so hard and smooth through out the RPM band. It feels like a completely different car. How does making fuel pressure steady add hp? What do I not understand. ?

03-15-2018, 12:16 PM	#7
robrocketanski Drives: ZL1 Convertible Auto Join Date: Apr 2015 Location: Macomb, Michigan Posts: 330	I have said for years (to myself mostly) that they run out of fuel and hp not just lean out and melt. That's why people say they may or may not need a fuel pump voltage booster because they just leave a little power on the table. When I first finished my car I had it on a dyno without the JMS plugged in. The car dynoed fine and power was less than expected at 600 whp. Then the car did 10.8 at 129 which for a convertible is pretty impressive on 600 whp. I am sure it was more once the JMS was plugged in. __________________ LS3 intake and throttle body, Huron Speed Products twin turbo with 6265 oil less turbos, and 3" header back, JRE smooth cam, ID1300, Fore dual 450lph pumps with MSD voltage booster, A6, 305/45/17 MT Street R

03-15-2018, 06:02 AM	#2
JB'sZL1 Drives: 2013 ZL1 and 2019 Ram Laramie Join Date: May 2017 Location: Milwaukee Posts: 1,259	You were running 1050's on solely the stock fuel pump?

03-15-2018, 06:14 AM	#4
03worthy4link Drives: Nil Join Date: Sep 2017 Location: Palm beach Posts: 32	Proper fuel atomization. Injector spray is as designed at the target PSI, same quantity, different quality.

03-15-2018, 06:35 AM	#5
curtmgulla Drives: 2014 corvette Join Date: Oct 2016 Location: tn Posts: 36	Yes I was running stock fuel pump but the id1050x... duty cycle before at wide open throttle at 6000 RPM was about 62% now it's 50% but a 10% drop...

03-15-2018, 01:53 PM	#11
curtmgulla Drives: 2014 corvette Join Date: Oct 2016 Location: tn Posts: 36	All I can say is I am amazed. The car felt like it picked up some power after all the mods... but still felt closer to stock feel it didn't really feel like what I added I got a big benefit from.. and always felt like from 4500 RPM on up the power kind of planed out... it was still pulling but didn't have that hard pull fill to it..... It feels like I added a hundred shot of nitrous to it in all reality no jokes aside the car feels so different.