When do you need a twin fuel pump?
 

When you want to run 9s.



The CJM twin pump prototype unlocked the extra power necessary to pull it off. That is the one modification that sets this car apart from the typical boosted 370z. How much power? 818whp Dynojet STD at 18.5psi on it’s highest setting.

It helps to have a good tuner such as SpecialtyZ as well. And E85.

It can be installed as a drop-in upgrade for our fuel systems without having to change the plumbing.

http://host.cj-motorsports.com/products/z34twinpic1.jpg

Click here to see it on our website!

Congrats on resetting the record! You guys kept pushing the limits of this platform.. just 2 years ago no one would even think of running 600+ on stock block .. now people are pushing 700+ safely with ease!

Whoaaaaaa...... So Phunk, I was looking at having to remove my old fuel return and upgrade to the new one to run a 450 pump. Are you saying if I wait a minute I can have a drop in solution without having to purchase and re-plumb another return system? Like maybe wait till say.... January/February?

Dead video. :(

Our older kits didn’t have an external filter, so you would still need to add one of those. Otherwise the twin pump can be run with a single or twin output, allowing it to be used with any fuel line combination. But in your case you would still have to play with the hoses to get an inline filter into the system. :(

Dead for me too. Click on his instagram link, it's on there and works.

Added YouTube link to the sig for anyone who’s browser won’t play the video from the thread.

:tup::tup::tup::tup::driving::driving::driving:

Charles,

My setup is close to Justin minus the twin pumps and I believe he has bigger than my 1150cc injectors? Does he daily his car and feel comfortable at this level with regards to reliability? Although hes at 818 did he run this pass at that level?

I personally wouldn't run my car at 800 on the street, but I did run it at 700 all summer. My torque was around 540fllbs. Its winter here so unfortunately my motor wont see 800 any more and I plan on building my motor over the winter.

I will also say I have between 20-35 runs at 750whp with no problems. Car was still trapping 142 at that power :)

Pretty nice grocery getter....

He has a 1300cc injector in the car. Mostly daily driven but he has another car for bad weather.

As for feeling comfortable with the power... like with any new power level, it takes time to establish comfort. Justin wants to build his motor and start working on the next milestone rather than stick around to see what happens long term in the 800s stock engine. Now that we know it’s not simply suicide to push it in the 800s (with appropriate care taken), I expect that sooner or later a few cars will be testing the same water and letting us know their experiences.

Fixed video:

All I can say is, "WOW!"

Way to put to 370Z on the map with the 9 second pass!

ok I see what you did... the browsers dont want the full URL for some reason. Thats pretty silly. Was working fine from my mobile devices but I see on my work PC that it didnt. Fixed mine.

With the YouTube BBCode, you only need the ID of the video and not the entire youtube URL.

The URL for this video is https://youtu.be/aHXMTzenVTg
All you need for the embedding is aHXMTzenVTg

BTW, I send you a couple of PM's =) Might be easier to communicate over email? I am ready to order stuff tonight =)

With yours and other people slightly lower daily numbers, I think I am going to get a couple hundred cc bigger injectors, the twin pump setup and maybe push for 700/550 on E85. The last dyno run I did for seb to get the ecutek controlling my boost solenoid was 620/550 at 14psi on my high setting. I dont want to go crazy on this stock bottom end but that would be a nice thing to say im able to change a map and be at 700hp for dyno outings and the occasional Mexico trips.

Side note, the RE-11 305's aren't cutting it at the 620/550... whats the next step for daily tires with some rain ability? Or am I in the brake change and tire change column if I want to use this power now?

Thanks Justin and congrats man!!

I have the same question, when I ordered my kit I did receive the external filter with my kit that I installed under the frame rail cover and you helped me initially during my order to find a way to install my EC-2 flex fuel sensor over the fuel hat with provided fittings about a year and a half ago I guess before the "E" kit was a thing?

How easy would it be for me to do the new hat, new twin pump, and rails? And would this be sufficient for big built motor power in the future or would I need larger lines and other things than that which came in my s1(.e?) kit?

Thanks Charles,

Lol, I have basically the same numbers and tune from Seb, 610/560. At that power level no summer tire is going to do any better, no even ps4s's which would be the only other street tire I would buy. If you are going to run at 600 plus whp, you got learn how to contol your right foot and make sure you got heat in your tires before ripping out on the hard top.

Sent from my SM-N910P using Tapatalk

Great job Charles, Seb was pretty excited about your collaboration on this project. Awesome stuff that is going in the Z community.

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If you have the external filter than you already have the S1.E kit... as far as our fuel system acronyms go, the E means external filter and that is how we distinguished it from the previous S1 kits.

You wouldnt use our billet hat with our twin pump, it would be one or the other since the billet hat is for the stock fuel pump housing and the twin pump has its own hat as part of its design.

The twin new pump can be configured to use a single -6 output, and factory style QD return... which means it can be used as a drop in replacement for the stock fuel pump module so long as the car has an external filter already, as the twin pump does not have room for an integrated filter.

Adding the rails would mean switching from your S1.E to our S1.SE kit. This entail purchasing the rails, the rail crossover hose, and the rail to regulator hose. The rest of the S1.E on your car would remain in place as they are the same parts.

Hey Phunk, What all would I need to do a return system and twin pumps? This will be a new upgrade. I am stock at the moment.

When used with our existing S1.E and S1.SE fuel systems, you can just add the twin pump. Nothing else in the fuel system needs to change. This spring when we start putting Justins Z back together with the built engine we will make some larger hose upgrades available for maximizing the twin pumps output, but it will already support most likely 1000whp with no issues as is.

If the car has one of our older fuel systems that does not include an external filter, most of the plumbing will need to be replaced and a filter added.

What 2 pumps will I need for E85 and a max goal of 800hp?

You could use a pair of Aeromotive 340, or a pair of Walbro 450... DW probably has some pumps that fit, I need to get more familiar with their product line one of these days. You can even mix and match, like one 340 and one 450, etc. 800 isnt a lot to ask of twin pumps since a single 450 can typically take you to 700whp with our high compression and relatively lower max boost engines.

I would highly recommend picking up a Hobbs switch to activate the second pumps relay in boost only... so that you arent pumping 1200hp+ of fuel back and forth just to idle and drive around.

Is someone planning on boost? :confused:



:drama:

I have been planning for over 2 years. LOL Time to stop planning and start doing.

Guess I need to go with a single to start with until I build the motor at a later date.

Congrats guys... Love it at the end... "Stock...Not looking good though" guess we know what the limit of the half shafts are now.

Oh... and I guess we all know the the MT is faster now too. :p:p:p

Phunk as much as it's gonna hurt I have to replace my whole S1 return with a new one. I've been waiting for the twin to show up on your site so I can add it to my fuel system budget. Can I get an idea on the price and availibility. No pressure, I just got reality checked with 10-12 weeks on an engine build and I was all giddy about just ordering it and waiting two or three weeks. Yeah No.

The twin pump is $550 without pumps. It comes with various fittings and attachments required for installation. (A set of 3x 6AN in/out fittings, a 6AN o-ring plug for single hose output configuration, and a QD adapter for stock feed line as return line use).

There is a pump install kit option for $55. This includes new pump strainers and PTFE hoses and clamps for installing your pumps to the assembly. It is available in 3 different configurations depending on the pumps you want to install (they can have different hose barb diameters).

Then pumps are sold individually. I assume most people will want to use whatever pump they are already running and then acquire one more either through us or anywhere.

Also, an optional thing we will have on the site, are Holley Hydramats that you can attach to the bottom of one or both of the pumps. They are pretty expensive, like $160 or so each, so I dont expect them to be popular. So far the reports I am getting back is that the twin pump is not experiencing increased fuel slosh starvation issues over the stock pump setup. This is probably due to the pressure side jet-pump we made for these twin pumps. It is recovers ~85LPH of fuel from the driver side of the tank at idle and more when you go into boost. On top of that, We have a sheet metal baffle with trap doors designed for this twin pump. We have not made any yet, its a future option / add-on. That is what the 3 black screws with aluminum washers you see passing through the top will be for.

Availability.. I think there is one left here right now. I have materials on hand for a large production run and sometime in February we will have plenty of them on hand.

Running installing with our current S1 external filter fuel systems, you would use just one of the 2 6AN outputs. The twin pump output is a sort of manifold, so you get fuel from both pumps regardless of using one or the other or both of the outputs. We last second decided not to use a 8AN single output for the sake of installation. 8AN would not really clear the access panel cover. Also, many customers already struggle to get a 6AN hose between the tank and chassis. So our first fuel line upgrade kit for the twin pump (which will be part of our new S2 lineup coming this year) will be a twin 6AN output line kit that merges into the single 8AN inlet of the external filter we provide in our kits.

Thanks man, that's not gonna hurt as much as I thought. Talk to you in about 3 weeks about this and an S1-SE.

I orded your external filter with lines to add to my S1 fuel system for like a year ago and its been sitting in my room all that time and for some odd reason it cross my mind Charles would come up with something again to upgrade the fuel system. Sshh man you need to ✋ with the upgrades 😂😂.

:icon18: at least this one can be used in compliment to the parts you still have waiting for install, rather than making them obsolete!

Haha true! The only part that it would be obsolete is the Top Hat which i also have in the package!

https://cj-motorsports.com/products/twin-fuel-pump-370z

page is up on the site for anyone interested!

http://host.cj-motorsports.com/products/z34twinpic1.jpg

Omgosh.

Tax Return Money = New 370z Twin Fuel Pump System? :D

Oooorrr....

TopgunZ A2A kit? xD

Which one .... choices choice... ! O__O

Id vote to start with the A2A kit! With a return kit and single 450 you can get pretty high in the power before needing to add a twin pump.