cosworth racing

Hi!

Does anybody know where to get 1000 ccm high impedant injector that fit will fit Cosworth?

tabetha

I think that Holley do some that fit, but these are a bit over 1000cc.
tabetha

cossie4i+

iTrader: (15)

I thought you need LOW impedence for a cossie ?

Steve

cosworth racing

It's for Pectel T-2. Been in contact with Pectel and they told I needed high impedant for it.

cosworth racing

Got any link for them?

tabetha

Look on ebay.com, they have the holley listed 230409129833, then look around the site, you will find injectors up to 5400CC/min 180lb, they also have the bosch 1600CC injector.
tabetha

cosworth racing

The one you're talking about are these:

http://cgi.ebay.com/ebaymotors/ws/eB...%3D1&viewitem=

And these are low impedance..

tabetha

Why not use a £1 resistor in the earth line to them ?
tabetha

cosworth racing

Use resistor so I can use low impedance instead you mean?

pacwest

Yep.

cosworth racing

Is there any problem in using high impedance instead? Are low impedance more accurate then high?

pacwest

No problems. No difference really other than availability.

cosworth racing

Some says the low impedance are more accurate the high. The reason they say is that they fail to open and close just as quickly, and with equal accuracy.

phatphuck

fiveomotorsport.
called bosch pink top.
just send a mail and ask them. i think they are 1020cc@3.5

tabetha

I ran high and low on my ecu with NO resistors, detected zero difference between high and low on the rollers, and also when using the low with resistors, after sustained use the injectors started to overheat, and stick when using low, when it(ecu) is specced for high.
At the end of the day it will need mapping to suit the injectors so any differences will not matter.
tabetha

cosworth racing

I've spoken to Usrallyteam, and he told me I should NOT use low impedance and restrictor. New high impedance was more the good enough. Low impedance with restrictor was useless to use he told me.

tabetha

Rather odd person he is, what does he think the manufacturer does to suit high or low!!
I trust the person I use, you should do as you want, he doesn't just happen to sell the ones you want does he ?
Personally I don't trust much that comes from the us.
tabetha

cosworth racing

Well, but speed has usually been faster with low-impedance. Here is your lesson…

a) Low-“impedance” = low electrical resistance = more energy flowed to open the injector = faster opening speed.

b) The difference in speed used to be huge.

c) Now the fastest high-impedance injectors are faster than the normal low-impedance even though they don’t use as much electrical power to work.

d) Vehicle makers no longer worry about low-impedance because the circuits needed to control the injectors are more expensive. Very little development is being done on low-impedance injectors (except for direct injection which sprays directly into the combustion chamber).

So, that explains why the lows are considered superior to the highs. But, that is a reputation that is getting less true every year, etc. These Genesis 1000cc (and the specific Bosch family that the solenoids came from) are SUPER fast. That’s why they allow for smooth tuning even though they are so big.

Okay, and here is lesson number two:

1) Notice that I said that the low-impedance injectors have faster opening speeds. That’s because they have stronger solenoids. These take that extra electricity to work properly.

2) They also have faster closing speeds because there is a stronger/heavier “return” spring that acts against the solenoid.

3) The return spring does not change in strength because it is purely mechanical.

4) By adding resistors to the low-impedance injector you increase the resistance.

5) At this point you will have converted low-impedance to high-impedance. (Again “impedance” = resistance which blocks electrical energy.)

6) Now, you will have a weakened solenoid but a super-strong return spring.

7) The result is much slower opening time (but no change to the closing time).


In short… adding resistors to low-impedance injectors makes NO SENSE! J You will get much better performance out of a high-impedance injector that has a proper balance between opening and closing strength. I hope all that is easy to understand!

LHD220Turbo

iTrader: (4)

RC engineering do a decent set of 1000cc injectors; bosch also make a set

dont use rochester!

tabetha

Theory doesn't always work out in practice, a major part you are forgetting is I assume you are not bothered bothered about 1/1000 of a sec saving, and not in the F1 races, lows with resistors are perfectly adequate for road use, a lot of stuff especially from the states is sold on bullshit, like the flywheels lightened to give + 20bhp WTF!!
Remember the purpose of a business is to make money, there 's many many very sicessful cars running what I and millions of others use.
The second a new bit comes out all the tuners rave about it as being the best, does that mean they were selling us shit before ?, no but they're hardly going to say this bit is no better than the bit you already have but please buy it I want your money.
tabetha

cosworth racing

Hopefully the world is in progress, and they will make better things Yes of course there is a lot of things that doesn't work, but some of it actually do

Stu @ M Developments

iTrader: (12)

we sell 80lb ph @ 3bar high Impedance and keep them in stock. Close enough for what most people need.

cosworth racing

What do YOU think about the high impedance injectors? Are they any "bader" then the low impedance? Will there be any problems?

Stu @ M Developments

iTrader: (12)

All I will say is those saying they are the same once you apply a resistor have no idea how the two different systems work as they are very different injectors. Just use what your ECU and respective mapper recomend.

Google saturated coil injectors and peak and hold injectors if you want to know more info on the differences.

Stu @ M Developments

iTrader: (12)

Sorry, I might add after re-reading that I agree 100% with "cosworth racing"'s opinion.

cosworth racing

Seems like Tabetha has quite another opinion about that