I am/was looking to upgrade my secondary fuel system, to go on my new rebuilt engine, it has a decent sized street port and ill be using a t04s with a 1.00 A/R on the exhaust side.
I currently have a standard primary’s and secondary with braided lines from the bulkhead with apexi GTR fuel pump
I have spoken to a few vendors about upgrading my secondary fuel system but every one Ive spoken to (re:worx – rxmotors – WGT) have suggested I get my injectors flowed and tested and rewire the pump and just up the fuel pressure
This all sounds great(nice and cheap) but has any one got any concerns about the setup before I go down this route?
cheers
With your setup I would run 850s all round Primary and secondaries, get a decent FPR so you raise the fuel pressure (Aeromotive or SARD not that FSE rubbish) and have the injectors flow tested and pump rewired as suggested . That should easily supply fuel for 400rwhp, which is what your tubby is capable of at around 1.1 to 1.2 BAR
Hi Mark, what would you say the limit of the 550cc + 850cc would be? as i am happy to stick with 1bar for now.
I agree with Mark, you can just about getaway with 850\'s all round providing your on a smallish turbo and no crazy porting.
You can modify the stock rail to get rid of the stock regulator to fit an aftermarket regulator which you will need to up your fuel pressure
You ask what the 550/850 limit is, well to run these you need to put the twins back on.
Hope this helps
This thread has some info about what injectors sizes will support what HP:
http://www.mazdarotaryclub.com/forums/showthread.php?t=30430 (http://www.mazdarotaryclub.com/forums/showthread.php?t=30430)
I was running a single turbo previouly on this fuel system and it made 321 hp at the wheels duty maxed at about 80% on stock fuel pressure.
Reading the links above this doesnt sound possible, any idea?
The problem with those calculators they do not take into account when you up the fuel pressure.
The most hp at the wheels I have seen with with 550/850s is 330 ish, if you up the fuel pressure maybe a little more.
If dont want to upgrade the primaries coz of fear of idle issues then go for the 1600 kit if your goal is 400whp
Whats your HP goal?
Mark, i would be happy with 360rwhp for now, as the car fund is tight at the mo, long term ( 1year hopefully) i want a gt* turbo with 1600 injectors.
Then yes 850s all round and rewire the pump and with an aeromotive fpr and up the fuel pressure will defo do 360 rwhp. Seen a few FDs with these mods do 400rwhp
Sorry for hijack - Can stock primaries & 1680 secondaries support 380rwhp without a fpr or uprated pump?
Regards
Mims
no, an uprated Pump should always be the first on the list of fuel mods
My car made 325rwhp with Standard Primary/Secondaries with a FPR and uprated GTR fuel pump. Was only running at 0.7 bar.
850s all round should do the job if your not upping the boost too high. Probably the cheapest upgrade to do too.
I was trying to avoid using 4 * 850cc\'s because of the issues people have lighted about the problems with idle low speed fuel cosumtion etc.
Is it really something i need to worry about?
no mate, that is what I had, 850\'s all round, sweet...
but get fpr defo
this looks like a good kits, what do you guys think?
http://cgi.ebay.com/Aeromotive-Style-Fuel-Pressure-Regulator-SKYLINE-GTST_W0QQitemZ170184100200QQihZ007QQcategoryZ72205QQrdZ1QQssPageNameZWD2VQQcmdZViewItem?_trksid=p1638.m122 (http://cgi.ebay.com/Aeromotive-Style-Fuel-Pressure-Regulator-SKYLINE-GTST_W0QQitemZ170184100200QQihZ007QQcategoryZ72205QQrdZ1QQssPageNameZWD2VQQcmdZViewItem?_trksid=p1638.m122)
Quote from: strange_days_ukno mate, that is what I had, 850\'s all round, sweet...
but get fpr defo
Si, what base pressure were you running?
cheers
Quote from: hairyhooverthis looks like a good kits, what do you guys think?
http://cgi.ebay.com/Aeromotive-Style-Fuel-Pressure-Regulator-SKYLINE-GTST_W0QQitemZ170184100200QQihZ007QQcategoryZ72205QQrdZ1QQssPageNameZWD2VQQcmdZViewItem?_trksid=p1638.m122 (http://cgi.ebay.com/Aeromotive-Style-Fuel-Pressure-Regulator-SKYLINE-GTST_W0QQitemZ170184100200QQihZ007QQcategoryZ72205QQrdZ1QQssPageNameZWD2VQQcmdZViewItem?_trksid=p1638.m122)
for that price you might as well spend the extra 50 notes and get a real aeromotive fpr dont be cheap on it as the real one can handle greater pressures and be more reliable and hold consistant pressure, therefore less likly to fail
I have no idle issues relating to running 850ccx4 injectors, general fuel consumption appears to have not changed. :)
Quote from: hairyhooverSi, what base pressure were you running?
cheers
I think around 45 psi. Carl would know, you could ask him..
try here (http://rx7.com/cgi-local/3rdgencalc.cgi)
its a handy fuel calc for the fd.
matt
hang on define a standard fuel system??
If its out of the box... about 260ish at the wheels with a PFC
With some tweaking to rail pressure etc as Blitzboy says its makes quite a difference, i have seen 300rwhp on 550\'s and 850\'s (but not far of its limit)
Quote from: Grizzlyhang on define a standard fuel system??
If its out of the box... about 260ish at the wheels with a PFC
With some tweaking to rail pressure etc as Blitzboy says its makes quite a difference, i have seen 300rwhp on 550\'s and 850\'s (but not far of its limit)
Yeah thats about right. Mine is 270 at the hubs on stock fuel system, but seeing over 90% injector duty.