JMS FuelMax installed - Page 6

ZLRob · 02-06-2023, 10:15 PM

The JMS units are really well made for what they do. They just work and that's great considering a lot of items on the market these days have such poor quality control that they can't even perform their primary function well out of the box.

Love me some ethanol!

ZLE dude · 02-07-2023, 06:57 AM

Quote:

Originally Posted by clg82

Are you able to see the "E" content with your i dash? and how long did it take you to get used to what percent of E to use VS premium etc?

Yes, iDash shows E content. It's honestly pretty easy. They make nice little phone apps for calculating ethanol content when you're starting out but after a while you get accustomed to where it will land. I'm usually in the 40-50% E range most of the time, but I'll typically fill it with 93 every other tank then mix E on the next fill when it gets to half a tank, so I'm always fluctuating between like 15-50%.

clg82 · 02-07-2023, 11:06 AM

Looks like this next step in my build will be put on hold....my tuner indicated that at MOST i'd be able to run is e20 with my Magnuson, since at the top end I was already starting to lose pressure. Not sure how some of you guys are running e40 and magnusons with just the JMS, but he mentioned he didn't want to take the chance of something happening catastrophically.

ShockingZ · 02-07-2023, 11:15 AM

Quote:

Originally Posted by clg82

Looks like this next step in my build will be put on hold....my tuner indicated that at MOST i'd be able to run is e20 with my Magnuson, since at the top end I was already starting to lose pressure. Not sure how some of you guys are running e40 and magnusons with just the JMS, but he mentioned he didn't want to take the chance of something happening catastrophically.

I have a 2650 on my a10 Zl1 and I also have the JMS installed and I can easily run e30+. Im at the bleeding edge at about e34, but down to e30 I have no fuel system issues. Low side good, high side good, injpw good and duty cycle all in the top of normal ranges.

E30 should be no problem as long as you have the JMS installed to help the low side. Without the JMS, I was running out of low side on just 93 with the maggie/93 pulley. No other mods.

clg82 · 02-07-2023, 11:23 AM

Quote:

Originally Posted by ShockingZ

I have a 2650 on my a10 Zl1 and I also have the JMS installed and I can easily run e30+. Im at the bleeding edge at about e34, but down to e30 I have no fuel system issues. Low side good, high side good, injpw good and duty cycle all in the top of normal ranges.

E30 should be no problem as long as you have the JMS installed to help the low side. Without the JMS, I was running out of low side on just 93 with the maggie/93 pulley. No other mods.

That is truly what is confusing too me. But he is insistent that I would notice issues. Is my high side or my low side fuel pumps going bad already? He mentioned that adding a JMS is like boosting an 80W light bulb to 100W. Sure it will work but at what sacrifice for efficiency. Also mentioned he's always had issues with LT1-LT4 GM vehicles and adding boosters.

ShockingZ · 02-07-2023, 11:27 AM

Quote:

Originally Posted by clg82

That is truly what is confusing too me. But he is insistent that I would notice issues. Is my high side or my low side fuel pumps going bad already? He mentioned that adding a JMS is like boosting an 80W light bulb to 100W. Sure it will work but at what sacrifice for efficiency. Also mentioned he's always had issues with LT1-LT4 GM vehicles and adding boosters.

Whomever your tuner is, should be replaced. There are loads of guys using the JMS with the LT1/4. They work perfectly and you are only upping the voltage to the pump from 15 to 17.3v. Its no big deal but it makes a huge difference for the low side. Then when the low side is pushing well, the high side gets better as well as the injectors.

I'd seriously get a second opinion from another tuner. Call Ted and JRE he will set you straight with about 40 years of tuning experience.

clg82 · 02-07-2023, 11:43 AM

Quote:

Originally Posted by ShockingZ

Whomever your tuner is, should be replaced. There are loads of guys using the JMS with the LT1/4. They work perfectly and you are only upping the voltage to the pump from 15 to 17.3v. Its no big deal but it makes a huge difference for the low side. Then when the low side is pushing well, the high side gets better as well as the injectors.

I'd seriously get a second opinion from another tuner. Call Ted and JRE he will set you straight with about 40 years of tuning experience.

I appreciate your input, looks like I'll need to do a lot more research before totally canceling this out of my build. How much boost are you pushing with the ethanol and magnuson?

ShockingZ · 02-07-2023, 11:52 AM

Quote:

Originally Posted by clg82

I appreciate your input, looks like I'll need to do a lot more research before totally canceling this out of my build. How much boost are you pushing with the ethanol and magnuson?

Depending on DA, I see 14-15psi. I have tons of logs showing everything with e30.

clg82 · 02-07-2023, 12:27 PM

Quote:

Originally Posted by ShockingZ

Depending on DA, I see 14-15psi. I have tons of logs showing everything with e30.

Sheesh, I would love and try to work with Ted, but I wish there was someone local to so-Cal that I could just drop it off with and pick it up when it's done

*radz28* · 02-07-2023, 01:43 PM

Quote:

Originally Posted by clg82

Sheesh, I would love and try to work with Ted, but I wish there was someone local to so-Cal that I could just drop it off with and pick it up when it's done

Working with Ted's easy. Just follow his directions, and you'll be fine. He does all the work. You just drive (smoothly) and it will be fine.

Evansa22 · 02-07-2023, 01:45 PM

Quote:

Originally Posted by clg82

Sheesh, I would love and try to work with Ted, but I wish there was someone local to so-Cal that I could just drop it off with and pick it up when it's done

Where in socal? Red barn racing is down in temecula, heard he's pretty good.

clg82 · 02-07-2023, 03:13 PM

Quote:

Originally Posted by radz28

Working with Ted's easy. Just follow his directions, and you'll be fine. He does all the work. You just drive (smoothly) and it will be fine.

I would LOVE too, just don't want the added expense of buying an MPVI3, laptop, separate gauges etc.....yes i'm being cheap

big dave · 05-03-2023, 06:19 PM

This was a great thread and really helped alot with my installation. My only problem is I cant get the voltage to move during setup process. I've read the Janetty instructions, and even contacted JMS, but still no success. The voltage maxes out at 17.6 at wot.

ZLRob · 05-03-2023, 07:39 PM

Quote:

Originally Posted by big dave

This was a great thread and really helped alot with my installation. My only problem is I cant get the voltage to move during setup process. I've read the Janetty instructions, and even contacted JMS, but still no success. The voltage maxes out at 17.6 at wot.

Ideally you don't want more than 17.47V because after that, the pump usually starts running into cavitation issues and that winds up hurting you more than helping.

02-06-2023, 10:15 PM	#71
ZLRob Super Stock Drives: Chevrolet Camaro ZL1 Join Date: May 2022 Location: Concordia Posts: 782	The JMS units are really well made for what they do. They just work and that's great considering a lot of items on the market these days have such poor quality control that they can't even perform their primary function well out of the box. Love me some ethanol! __________________ 2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec 2.5 upper, NGK HR7 Ruthenium plugs, Nostrum 22+ injectors, XDI Goliath HPFP, Katech dual in tank low side pump, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Soler ported 87mm (91mm eff) TB, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Black Widow Angry Housewife/ Corsa NPP mufflers, Borla X pipe, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi 834 HP/ 840 TQ

05-03-2023, 06:19 PM	#83
big dave Drives: 2017 ZL1 Join Date: Aug 2009 Location: Maryland Posts: 1,052	This was a great thread and really helped alot with my installation. My only problem is I cant get the voltage to move during setup process. I've read the Janetty instructions, and even contacted JMS, but still no success. The voltage maxes out at 17.6 at wot. __________________ '17 ZL1 10.99@129 stock. 4225# raceweight. Best 60'- 1.66 on factory tires. 10.48@132 E50, intake and tune. 4270 lbs https://youtu.be/EyHtdH9XOkY https://youtu.be/Lcu41obbTf8 '13 ZL1 BRM A6. 11.591 @ 119.2 factory stock with a 1.68 60'! Best stock mph 121.8. 11.29 @ 123 RotoFab, drag radials and skinnies. 4360# raceweight. http://youtu.be/yggIA3C_kkA 2014... back to stock http://youtu.be/spQLaTWbThs 2013... stock & RotoFab

02-07-2023, 11:06 AM	#73
clg82 Banned Drives: 2020 Camaro ZL1 Join Date: Oct 2020 Location: Texas Posts: 1,724	Looks like this next step in my build will be put on hold....my tuner indicated that at MOST i'd be able to run is e20 with my Magnuson, since at the top end I was already starting to lose pressure. Not sure how some of you guys are running e40 and magnusons with just the JMS, but he mentioned he didn't want to take the chance of something happening catastrophically.

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