Right, i need educating about fuel systems!
Done a whole lot of searching but most people seem to do this when going single - i don\'t want to do that, so need to know what i require for the twins
Car is due an MOT in Feb, so if it\'s going to WGT I may as well add a few more bits and get a new map ::) (That\'s my logic, run with it... :o )
Current Spec is (important bits):
V-Mount
Apexi Intakes
HKS frontPipe
Tiger silenced midpipe
Racing Beat cat-back (twin exit)
99 Spec twins.
Power FC.
And a few supporting bits (Koyo Rad, SSQV, heat wrap, etc)
Stock ports.
It hit 340ish atf at it\'s initial mapping.
Basically the power is more than enough for what i use it for (weekend toy, track days) BUT at the 0.92 bar that Pip mapped it at it sometimes hits 94% duty on track - I\'m not happy with that.
So, what i basically want to do is run to the safe limits of the stock twins - running this power but at a much lower duty would be fine, but i guess better fuelling would give me a bit more power too - can\'t complain.
So, what do i need to push the stock twins to a comfortable limit?
I\'m thinking:
Fuel pump - Walbro or 044
Rewire fuel pump.
Then the Fuel system - this is where i\'m a total n00b.
I know i\'ll need bigger injectors, and i guess secondarys are needed, but:
What size?
what supporting mods? (Rail and FPR totally neccessary?)
Anything else?
Any suggestions for Kits? one of the KGParts setups?
TIA :)
Si
It\'s surprising they are not already maxed.
044 or a denso pump. 850 primaries the cheapest option. If you go secondaries you may aswell get 1680\'s you will also need an fpr and new rail.
Deffo get a pump.
850 primaries I think are to be avoided as they are a pain to sort at idle.
With my car even with a FPR and pump (and keeping pressures sensible) my stock injectors were running way high duties at 0.9bar.
I went for a replacement secondary rail and 1600\'s which I realise are complete overkill for stock twins, but it saves changing them later if I go single.
I had thought about 850 primaries but I want the most refinement i can get - And from what i\'ve seen the best way to go about this is not 850\'s all round - i\'ll happily be shown otherwise though, as it\'s a lot cheaper!
Meddy - what kit did you mind for, and what sort of budget if you don\'t mind me asking?
I was looking at something like 1600\'s just as it seems like the best and most common option.
Mine is running 850s all round, yeah it is rich when idling but I\'ve got used to that now.
I do plan to upgrade eventually to the 1600s setup as I would like to go the single route eventually.
But depends on your budget mate, if you want something cheap then go 850s all round but get it mapped properly. If you want to go single later on then go for the bigger secondaries.
Yup, I was thinking of 850\'s all round, but I always promised this car would not be skimped on, so i wanted to keep the primaries and get bucket spec secondaries so i could keep the low end driveability as good as poss :)
Any suggestions for rails etc?
Injectors? I\'m sure it\'s got to be possible to get it cheape rthan a US sourced KG parts kit
(runs off to his favourite RHDJapan :D)
Shame all the exchange rates suck right now...
lol You will not get it cheaper then the Kgparts kit, still a bragain as you get the rail,Bosch Injectors,Aeromotive FPR and fittings
Bear in mind shipping, import duty, and the hugely suckass echange rate right now :(
still cheaper from America as the Yen is much stronger then the pound
Quote from: SiH;548316Yup, I was thinking of 850\'s all round, but I always promised this car would not be skimped on, so i wanted to keep the primaries and get bucket spec secondaries so i could keep the low end driveability as good as poss :)
Any suggestions for rails etc?
Injectors? I\'m sure it\'s got to be possible to get it cheape rthan a US sourced KG parts kit
(runs off to his favourite RHDJapan :D)
Shame all the exchange rates suck right now...
When I had my engine rebuilt by Pip, he suggested getting 1600cc secondary injectors. The car already had a walbro fuel pump on it. It was a few hundred ££ though - speak to him and see what he recommends.
Just to let you know, the car is 333 rwhp (395fwhp) on the twins. Driveablility is great, car is mapped conservativley and the duty never goes above 80%.
Hope this helps.
Regards
Chris
Your ported then Twisted?
Im in the same boat now, .79 bar on twins i want .9 so FPR, pump and secondaries. where is this kg parts kit listed? and is it easy to fit?
Quote from: DR SCHNITZEL;548563Your ported then Twisted?
Im in the same boat now, .79 bar on twins i want .9 so FPR, pump and secondaries. where is this kg parts kit listed? and is it easy to fit?
Yes I am!
The only thing that holds back the boost on the car is the wastegate - Pip said it needed to be ported and it could run 1 bar happily which would be nice.
The fuelling upgrades he made would be more than sufficient for that.
Regards
Chris
Dammit - there was me hoping that was stock ports :D
If you are going to be looking at going Single later then it\'s worth sorting out your Fuel Lines. Stock they are 6mm, uprate them to 8mm/10mm and you will have a sound basis for any fueling upgrades you do. HTH
Quote from: Warthog;548976If you are going to be looking at going Single later then it\'s worth sorting out your Fuel Lines. Stock they are 6mm, uprate them to 8mm/10mm and you will have a sound basis for any fueling upgrades you do. HTH
Ahhh, the man himself :D
Never going single on mine :no:
When you were pushing the envelope, other than what i have listed, what were you running? Anything more than the above fuelling mods and some porting?
Quote from: SiH;549013Ahhh, the man himself :D
Never going single on mine :no:
When you were pushing the envelope, other than what i have listed, what were you running? Anything more than the above fuelling mods and some porting?
The list is long mate, I will post up when I can HTH.
i went for 1600 secondaries on mine and they worked fine, i got a kit from rx7store that had everythin in that i needed. I have used them several times and have always been good but a few others have mentioned bad experiences getting replies to emails etc.
Complete Fuel System apart from fuel pump
http://www.rx7store.net/product_p/extremefuelfd.htm
Also i went for the Nippondenso Fuel Pump, cheap and stock fitment and makes no noise, i ran it for 2 years without a problem
http://www.rx7store.net/product_p/nippondenso%20pump.htm
I ran this fuel system and pump for 2 years with no issues at all and was comfortably running 1.0bar on stock twins
So on twins more than .8 you need
ported wategate
fpr
fuel pump
injectors
bigger fuel lines (optional) then up to 1.15 on standard tubs.
Is that right?
Quote from: DR SCHNITZEL;550410So on twins more than .8 you need
ported wategate
fpr
fuel pump
injectors
bigger fuel lines (optional) then up to 1.15 on standard tubs.
Is that right?
No.
I run 0.9 on just induction and exhaust, mapped by Pip.
(with appropriate cooling mods)
1.15 is, as far as I\'m aware, really pushing the stock twins past their efficiency limit. It\'s my understanding that at that level they aren\'t producing much more power and are starting to blow some very hot air, as opposed to a useful charge.
Cheers for the input Guys, I\'m almost certainly going for the KGParts rail kit with 1600\'s and either an 044 or Denso pump :)
However, one thing I\'m unsure of is the injectors - does anyone know which ones they are that come with the kit? RX7store are being very cagey and I\'m not commiting without knowing.
I\'ve also got Coolingmist WI on there as well, but that\'s a safeguard, I\'m not mapping for it.
The kit comes with ford injectors they\'re alright altho low impendence with the resistors shouldn\'t be a problem. However the rail might be they\'re not exactly well made despite what people have said in the past, saying that i think kgpart have revised it again recently.
Quote from: DR SCHNITZEL;550410So on twins more than .8 you need
ported wategate
fpr
fuel pump
injectors
bigger fuel lines (optional) then up to 1.15 on standard tubs.
Is that right?
no you dont need ported wastegate unless you have a ported engine and start to see boost creep otherwise dont worry about that. I was running standard injectors and put the boost up to 0.9bar and the injectors were hitting 94% injector duty which is not too good so changed the secondaries to 1600cc, i was then running at 1.1bar on the twins and injector duty was only around 70%.