I’ve been running the Greddy TT for 2 1/2 years, putting down 463WHP (stock internals)
When contemplating the possibility of going forged all the way, one of the things that cause me a little hesitation is the fact that many cars out there with TT kits have 500+ WHP without a return line and no issues...
The question is this: With a Bosch or Walbro (witch I’ve already have installed) fuel pump and 650cc injectors, other than forged internals; Could I go safe without a return line putting down between 500 and 530 WHP?
I know for a fact that lot’s of tuners recommend the return line, but is it really necessary? Is there anyone in the forum running this setup without a return line?
In another thread, the issue was addressed, but it was not the subject, so it wasn’t discussed to the fullest.

 

463whp@ 8psi with the Greddy? Does that sound right?

JET

 

Sounds like a generous dyno.

As for a return it is recommended/must as it gets tough to tune it at higher boost levels because the pressure will fluctuate.

 

get a basic return system from altered atmosphere...best 500 you will spend....i think u r running more then 8psi!!

 

Hmm... sorry for didn't post all my mod, I been in this forum since 2002 and some people know me around here...

JWT Cams, Crawford Plenum, Custom 2 1/2 Greddy EVO II Exhaust, Wastegate Dumps, U/R Pully, Walbro 255, Technosquare Reflash, Greddy Boost Controller & BOV, JWT Clutch Kit... 463 WHP witht 93 oct gas in a Dyno Jet (P.R. is on Sea level)

but Back to topic... What about all the cars with out return line on 500+ whp???

 

I have seen some vids from webcarconnection doing the 1/4 mile.Those guys down in P.R have some ridiculously fast cars.They were running in the 10's with no helmets or roll cages.I think they may be putting some Puerto Rican Rum in the gas tank or spraying it....j/k

 

what cars are those?

 

VRT cars LOL

 

IMHO, if you are spending that much money on a project, just get the return fuel SYSTEM. It is much more than just a return line. It's a complete high volume fuel system..rails..lines..pump...and all the fittings.
Proper and stable fuel pressure is one of the most often overlooked elements of tuning. Yes, you can tune around it, but your consistency deminishes, and we dont want to take an unecessary risks on a big project like that.

 

Here you go my friend

https://my350z.com/forum/drag/204143-one-good-day-the-track-vid.html

 

Yeah thanks for the words Sharif, I know that we have to be prepare... but with the basic return system, we can be in the 520-530 whp range w/o any risk?


BTW I just wondering how come there are so many out there w/o return line... one of them for example is my friend with the Black Z (10.9@124) that have 520 whp w/o return line (650 injectors, Walbro and E-Ultimate)

 

What about the basic return system, it can handle the 520-530 whp range?

 

http://www.alteredatmosphere.com/mm5...y_Code=350Z_FS
can support safely up to 450 rwhp.

 

Thanks Andy, but I want to know if anybody out there is putting 500+ whp w/o any return line or with only the basic return system

 

Yep we are still returnless. Beating the crap out of our cars, with no return lines, AND STILL NO PROBLEMS. IMO, fuel return system is not necessary if you have the proper set up, tune, and fmu. There is nothing wrong with a fuel return system, but we prefer to not use them. I would rather find other ways to maintain constant fuel pressure, and would prefer not to circulate and heat up all the fuel pumping it back and forth.

 

Well let me tell you that I Know webcarconnection and his car was done by my close friend Tony who by the way tunes my G35 and also helps my friend carlitos with his g35 who has 720rwhp with nos and 640 without mine has a conservative 630 rwhp at 18 psi. his car runs very well for the equipment that he has, but Quique you should follow on our footsteps and you would be well don't be penny pinching if you are going to spent time and money doing your internals.

Also we have been hitting the 600rwhp mark a couple years ago if in doubt ask shariff, and tune the fastest automatic supra in the states 9.5 sec. at hte 1/4 mile

your friend carlosg

 

So what fuel system, tune, and fmu are you refering to? Split second box and a voltage booster for the walbro?
I know you guys track your z's a lot...so do we. I also tracked over 2 years ago...back when I was running the eManage Ultimate and a Walbro pump on the stock block. I had zero problems too....but there are better and safer...more consistent methods out there.

Again...people seem to refer to this "return line". This is not a simple return....these are complete return fuel systems.

 

Oh I am very familier with the type of work you do and what a "return fuel system" consists of. A better way of doing things, now thats debatable and I still hold strong to the fact that I see it as unnessarry. End of story

 

hehe... Are you calling me cheap??? hahaha j/k... is not about the money, when you do this projects you know you have to spend more money that you really want to I just wondering why is a lot Z's and G's w/o it, thats all...

Saludos!

 

speaking of return line, my car has a return line, it has the regulator mounted right above the pump and just a short line running from the regulator back to the tank, is this a safe reliable return line?