with all the different colours out there it gets confusing, can someone list them and what kinda power they give enough fuelling for pls

 

http://www.telusplanet.net/~chichm/tech/injectors.pdf

 

sorry but thats too much info for me

 

Switch,

OK,

The "can-o-worms" simplified version:
Yellow/Dark Blue - good for up to 280 BHP - but with judicious fuel pressure adjustment 308 BHP (ish).

Greens - good for up to 360 BHP

Light Blues - up to 400 BHP some would say 416 BHP

Greys - up to 440 BHP (edited to 440 from my optimistic 480)

OK flame time

 

thats more like it

So a set of light blues will be good enough for anything from 360bhp to 400 ish sop why do loads of peeps go straight to greys??

 

Greys are a "safer bet" as they flow quite a bit more than Lt Blues and chips for greys are easier to obtain (wide choice)........those are the usual reasons given.

Light Blues are a Motorsport injector with a very good spray pattern and are often overlooked though.

Also, greys will give you more scope for future upgrades, so in the long term the Greys make more sense money-wise

 

Switch, also dont overlook the fact that Light Blues will match your Cam Cover much better than ANY other colour injector

 

these days i think a more appropriate question would be "why bother spending money on greens/blues when you could go straight to greys"

if mapped right its pointless going for a small injector IMO

 

Greys up to 440IMO.. and youve been lucky at that.....

Also worth noting is that greys are no longer a "Big" injector.. i favour 750s over greys personally from both a price and efficiency point of view.

 

True enough Steve,

Stu has said that his grey injector conversions idle as well/if not better than standard injector cars......also that off boost performance is not compromised because of the greys! Best of both worlds

 

exactly.

my car ran greys, 2.5% c/o, a LOT smoother than when on std injectors (temporarily on std inj chip on few occasions and felt horrible), and unless your giving it loads, not noticably worse on fuel, if anything it better as didnt have to use so much revs/throttle to get anywhere.

and a live map by stu etc id be sure would be even better than that.

and like stu said, may as well go to 750s

 

My Dad's car idles at 0.6% IIRC on 750cc injectors on an L8 ECU! Plus it's more ecconomical than on greys...

 

one of my customers turned up one morning with his new 4wd saff running over 550bhp, when I opened the bonnet to have a look at his new beast I saw 4 yellows sitting there!!!! so you are all talking bollox

 

oh and by the way when I put it up in the air it was only 2wd!!!!! but it has a 4wd bonnet he said

 

Not even Karl could get that

 

i have a "galbally" type question here ......

if yellows can fuel for a proven 300, and greys have double the flow rate per min (i think) then why can greys not fuel for double the hp

 

Firstly, 300bhp isnt safe at std fuel pressure which is what we are quoting...

Secondly, because the AFR acceptable at 300BHP would destroy an engine running the cylinder pressures and exhaust temps of a 600Bhp engine Jim.

Thirdly, the induction stroke time base limitations will ruin your chances even with higher fuel pressures.

 

Because!!

Karl quoted 520 bhp as a total maximum if i recall correct, but this is not recomended at all!!

 

ahh good old induction stroke time, knew it all along

 

Can you really trust that list? It says that Bosch 403 injectors are blue?

 

 

GT2,
not sure if you can mate,,, but they might make any colour

 

Just testing me eh?

 

Stu, are these 750cc injectors also from bosch

 

Depends which ones....the ones on my Dad's are not Bosch....

 

what make are these from your dad

 

LOL ive absolutely no real idea what that collection of words you said means, i know them all seperately only

 

whats an injector??????

 

an instrument which sprays petrol in your engine

 

Its a fuel tuning fundamental law.. maybe it would make a good small essay as when you grasp the simple concept of induction stroke time base, a lot of things fall into place.. including why we can have high torque and low bhp etc etc..

 

HaHa still keen to find out what injectors are used

 

So is there a downside to not keeping std fuel pressure anyone?

 

actually Doug, cam cover is now silver so greys would look much better!!!!

Stu what are the costs involved in getting a good fuel return from the greys and how much cost wise, ish,

ps a nice informative thread

 

good call - i was wondering this myself the other day!

and what is after greys? blacks i think i heard sum1 say - or they having a laugh?

& what does big powered cars like karl's use??

 

Well,
depends on the condition of the pump and electrical system you have, but most cossies will start to spit dummies at elevated fuel pressure as the extra load on the fuel pump adds extra load to the shonky 15yr old wiring which often leads to engine meltdowns so you have to be vigilant to say the least.
The reason its commonly done is to help out with the aforementioned induction stroke timebase limitation again by firing more fuel in the available timeframe. It does help with this but its not free power as it does in turn place extra stress on things.
Another issue IMO is this:
Say you buy this extra fuel pressure equipped vehicle second hand, the fuel regulator fails, so you sensibly fit a nice new standard one and she promptly melts first time you nail her.... Then what will you be saying? "Stu @ MSD chipped this, and its melted"

Tricky scenario..... lol


varies depending on what Ecu and car you have as it needs lambda input to teh ecu and level 8. Prob easier and faster to discuss by phone.


Colour means nothing really. After greys with marelli id personally be looking at 750cc then 1000cc. Im interested in getting the 1600s to work if anyone want to try?

 

CheeRS Stu will be calling u next week to discuss

 

So you think 1600cc is dooable Stu?

 

yes... allright.. can you handle autronic sm2 ?

 

Its confused the shit out of me!!!!!!!

 

They are secret injectors!

Danny B can supply them if you want some. The company that make them also make even larger injectors (think they do 1000 and 1200cc injectors as well but Danny can confirm what they do)