I'm at a crossroad with my car right now. out is the aps single and exhaust, in is a gtm shortblock, greddy twins(15psi springs), greddy exhaust, aam downpipes, gtm exedy clutch, plus some other stuff. i currently have the utec with map selector and a set of scott's stage 1 cams. the question is what fuel system should i go with for my power goals? i know that aps and cjm both have twin tank setups, but both are new to the market and i haven't heard of either of these kits on street cars yet. AAM makes the external pump setup that i have personally seen on carv2's 350z, but it is loud and too racey for my g. how much horsepower should i expect on a single pump? we are talking a car that i drive 2-3 times a week, and this isn't a show car. should i just bite the bullet and go with the external pump setup or should i rock the single until the twin pump has been on the market for a little longer. btw, my goals were 550-575 on pump gas, and 600+ on c-16. thanks for your input in advance.

 

This will vary but a single Walbro will support from 550whp-600whp. After about 15psi on a Greddy set-up the fpr wont rise at a 1:1 ratio with boost, the fuel pressure will start to fluctuate. I dyno'd 580whp (Im sure its higher now with break in) and pump gas and Im at my limit. Some cars can run more before runing into issues. Id personally wait for the CJM stage 3, the AAM system is too loud for my personal tastes, in the next few months other companies will be offering solutions (twin in tank) as well...Im waiting for the stage 3 and then doing a race gas map.

 

you're probably right. it's not like 550whp is a low number. i guess when i threw down the gauntlet on this build, i was confident i would be seeing 600+whp right off the bat. with those 15psi springs i just wonder what my numbers will be with cams installed. at least with a simpler setup i can use carv2's base map to break in my motor.

 

I run Greddy Twins, JWT cams, no headwork, 9:! comp with a UTEC---> 525whp @ 13psi and 580whp @ 15psi ona Dynojet, STD correction. The car has without a doubt gotten faster after a few thousand miles, I have to redyno soon. For what its worth, I rarely run the car in high boost its just not needed! Trust me around 500whp is the sweet spot on the street.

 

what fuel setup are you running Alberto? also i wont have the chance to run 13psi unless i keep 10psi springs, right? i know that this setup will be more reliable than my st setup when it comes to these power levels, but i guess i wanted more power since i literally ditched my whole st setup for a built tt setup. anyone else the boards want to chime in on this?

 

Correct you will need the 11 psi springs and raise the boost with a controller

 

If you contact jwt u can get this kit but i have built 500 to 600+ motors with this setup. 255 walbro pump, 530cc injectors jwt, and jwt fmu it is an easy install and u should run a 10g wire relayed to the pump but not needed (if u wanna keep it street) also if you plan on running that much whp u might wanna bypass ur knock sensor only recommened on race apps though.

 

westpak-->not correct bud...1 bar Tial WG springs after pressure losses through intercooler = 13-13.5psi on these cars. I run wastegate spring as low boost, and an EBC for 15psi. I run an AAM stage 1.

 

You get more control of that 13 psi setting if you go with an 11 psi spring and raise the boost with a controller. This way you can use start boost settings and gain to get a better response and not overshoot 13 psi rather than just using spring pressure.

 

I dont overboost on low boost, and I build 10psi right at 3000rpm's, thats about as good as Ive seen from the Greddy kit. Agree to disagree

 

No offense and i'm not tryin to move this thread off topic, but theres no way that i'm gonna trust a fmu and a returnless system at that power level. i know its being done on some cars with sucess, but its not happening on mine.

 

i had read that you could smell gas in the cabin using the aam stage 1. i had never spoke to anyone personally using this setup. what are your toughts on the aam versus the cjm comparable setup. oh yeah, what size injectors are you running.?

 

I have no personal experience with CJM's kit, the AAM is weird some days it smells, others it doesnt. It can get bad though. I run 750Cc RC's...

 

AAM Stage I problem is with the pump assembly in the tank. For the return line, there's an o-ring where the line taps the top of the pump assembly. This has a tendency to swell and contract due to temp change. If it's been tightened a hair too much, it can eventually split - this is why some have reported fuel leak issues with the kit as well. Frank (@AAM) came up with an aluminum piece to fit over the o-ring to prevent it from being tightened down too much as well as to help with sealing... There was also a report that the lines they were using initially weren't wrapped and caused smell due to vapor sweat. Not sure if this was confirmed by AAM, but I do know at some point they started using a different return line.

Anyway, short story long, the AAM return setup is solid as long as you get one of the newer versions that's addressed these issues. My personal recommendation is to go with the CJ as I haven't heard anything but positive comments about it's performance...

 

i guess it all depends on which one i can get my hands on. motor is being re-assembled soon.

 

Does anyone have release info on the CJM stage 3?

 

Were u at cali speed way last weekend