Nope - I'm on 3 bar

stock pump starts to cut out below 310 real BHP.

JohnS can you suggest a spray pattern please?

This is for a 16vt not a 20vt

the split 20 degrees with each within 10 deg of that sounds right but I'm not sure I understand the description. Ask Flea also - I think he may have looked at a few suppliers of injectors.

huh. that's the first time I heard of somebody driving more than 330ps on OEM injectors. Maybe if you have a 20vt.
A friedn of mine drove 330 ps setup on OEM injectors and OEM pump and at 6.000 rpm injectors were almost on 100% cycle !

Pump supplys fuel with 3,5 bar pressure and with my 650cc injectors it will do just fine for 450 PS. On 7.000 rpm injectors will be on almost 100% cycle.

yes begbie, i'm talking about 16vt engine.

So say I wanted to run 1.5Bar - i'd need a 3.5Bar FPR then if I were to keep standard injectors?

Something like this perhaps?
http://www.genuinesaab.com/catalog/product_info.php?cPath=47_53&products_id=203

Hi,

Just to comment on the fuel pressure. I've tested on flow racks and guess what, higher pressure does give you a finer spray (finer fuel particle), so this should give you a better fuel economy. However, if you go beyond the recommended working pressure of the injector(varies from injector to injector), it just stop all together as the fuel pressure pressing down the pintle is way too great for the energized solenoid-pintle to over come. Furthermore, another problem is that if you increase the pressure higher than recommended, this would mean that you will need to increase the pulse width or duty cycle at higher revs as the injector reacts slower (with the higher fuel pressure holding the pintle shut) versus when it's working under the normal fuel pressure. With that said, it is best to see how injectors perform under the intended fuel pressure, rather than assuming that higher is better

Have a look at http://www.precisionturbo.net/
Strongly recommended

A friend of mine is a Bosch agent. He also sells Walbro etc. I was going to buy a Walbro 255 but he says they are not recommended for high pressure. They have a pressure relief valve at around 60 psi and they wont flow anywhere near their raited output at pressures close to 60psi anyway. There maybe some exceptions but he said pretty much all internal pumps are similar, they dont like high pressure.

IIRC, the pressure relieve valve of the oe pump work at 7.5 bar. For those using uprated fuel pump and FPR, it's best to have the fueling on the RR as the FPR is a manifold reference type, so if you are using a 4 Bar FPR and a boost level of 1.5 BAR, this means the actual pressure at the fuel rail is 4+1.5= 5.5 BAR!!! So, if, like what Scruderia said, that some of the fuel pumps are not designed to work under high pressure, then you better off with the standard pump. Let's not forget that 140L/hr means 2333cc/min with the oe pump and that a phased sequential injection means that at best, only 2-3 injectors will be firing together at any one point. And if the OE injectors are rated at 330cc/min, you've got more than enough for a little more squirt. Having said that however, if the pump is old and the supplied voltage drops, then that's a different story.

Nigel, wouldn't your performance head mean u need less fuel to make more power?

i can get Bosch 0280150558 Green Top fuel injectors 440cc for coupe 20v turbo 35pound per piece incuding delievery.I got other size to and i can get very cheap.I have siemens,bosch,rc,delphi and more.ready stock.tq

This is why you don't just need a walbro 255lph but you need the high pressure one as well

Hi you guys,

I was reading about the Siemens Deka that suppose to spray better (300kPa) and with a better atomization fuel we would have sort of economy and some more power with a right air-intake and mapped ECU.

My question is:
would the Bosch ECU (my car is a Marea 20v not turbo) support 12,5 ohms since the original Bosch injector is 15,9?
They fit normally? Plug & play?
Was reading your forum for a while and found really nice.

Diego

Diego,

I'm running Siemens DEKA injectors without any problems on my 16VT. Considering that 16VT-20VT injectors are interchangeable it is safe to assume that the DEKA will work on your ECU.

V.

Thanks a lot Vas,

I really apreciate
Diego

forgot to ask wich one you' re using Vas....

To my purpose (not turbo)I was thinking of this one:
330cc - Mini S
Stock replacement part
Siemens Deka 1521390
2002-2005 Mini S

Any other place I can found it beside here?
http://www.fiveomotorsport.com/Injector_SetsMODS.asp

I guess this would be oversizes....... or not?
http://www.racetronix.com/M145FM.html

difficult to find on the Net and nearly impossible here in Brazil

Well just found out that the Mini injector wont fit .....too short

I just bought 5 Bosch 440cc injectors from sprayitracing.com , but before i asked for the pressure and spray pattern, and they are rated at 3 bar (but can take up to 7 bar) and 10 degree spray angle on each side = total 20 degrees - like JohnS said it should be.
I had it shipped from the US to Denmark, and it only took about 3 days! So excellent service, no worries there...

sorry,

just logged on, yep I used sprayitracing.com, fast communication, excellent service, injectors were in Greece in 4days, so I'd definitely recommend them!
Bl@@dy cheap as well

V.

Spoke to PT today about injectors and they said that I need about 384cc injectors with a 3.8Bar FPR. I have narrowed the choice down to three injectors which one do you think I should go for? Also consider the spray pattern.

1) 389cc/min http://www.racetronix.com/01D114x.html

2) 391cc/min http://www.racetronix.com/621037.html

3) 380cc/min http://www.sprayitracing.com/36lb%20Lucas%20High%20Impedance.htm

or get them s/h off a 16vt...

Or you could try these -
Genesis twin spay injectors They are $68.75 for a set of 4, so 5 sets and we can do 4 coupe engines. Works out at around £45 for a set.

That's per injector Squid

just look at the workshop manual and figure out which spray pattern matches the standard pattern the best, or ask them if they have any technical know-how.

The risk with the wrong angle is that you end up spraying the wall of the cylinder head or the port divider which will lose you power. For me I have to accept that as I would rather lose 20BHP (which I probably am doing) and have injectors that can support a low frequency for idle than have ones at the right angle that mean the car runs lumpily at low rpm, but you don't have that problem....!

Message from http://www.usrallyteam.com

"J, we have the injector you're looking for, but I can only sell them in sets of 4.

The alternative is a Siemens 380cc which has the exact
dimensions you've shared. Instead of firing 2x cones it delivers a single wide one. We use these most often in the VW/Audi 1.8T engines. They also came from the
factory with injectors that spray twin cones. Actually, that's not completely true as the original 1.8T used a single wide cone and the later models had the twin spray.

Anyway, the point is that we can supply the Siemens. If you're interested to go in that direction, please let me know."

@ JohnS
I have read the info on that data book and its says “two splits of 10 degrees” but I am unsure if this description matches that: http://www.racetronix.com/621037.html

Which ones do you think I should get?

Flea, It sounds like per set to me!
"Genesis injector set for all 16v and 1.8T engines"

J, I would say go for the twin spray type. I need a set as well, so if we buy 5 sets we just have to find two other takers for the remaining 10 injectors.

yeah it does sound like a set until you look at the quantity with the minimum being two. Since they are a retailer no retailer is going to say you must buy two sets.