SuperZ

iTrader: (2)

Are the new Racetronix 79s the highest flowing High impedance injectors out there?If not what else is there

Nasty N8

iTrader: (33)

Yes they are the largest. Even at that size I rec. stepping up to a low impedance and a controler.

Nate

SuperZ

iTrader: (2)

and then running a 96lb?wich ones do you recommend ?Then Ill be ordering your stage 1 race kit

stevieturbo

Schimmel Performance do some 90lb high impedance ( modified delphi's ), and there are some modified Siemens knocking about at 83lb's

Not sure how either would perform on an LS, although Bob at Schimmel did say they have sold a few sets to vette guys with good success.

I was going to go down that road.....but decided upon a different path

SuperZ

iTrader: (2)

any down side to running that large of a high impedance.Would they work as good as a driver box and low impedance?

fenix999

iTrader: (17)

i think 72's or 79's high impedance would be good. But then again i dont know what you're setup is like and what your injector duty cycle was like with the previous injectors (maybe 60's?). Looking by the time and MPH in your sig you might be on the verge of larger low imp. and a driver box. I say call racetronix and see if they have trouble tuning with them since they are so large.

fenix999

iTrader: (17)

the Lingenfelter guys on (ebay) sell some 72's or something of similar size, they might be modified motron/siemans deka 60lbs

stevieturbo

Ive been using RCEng 73lb, but at 66psi base pressure. These do work ok down low....but only ok.

I dont like them. So dont know if its just them, or all big high-z injectors. I am going to dump them in the near future though.

Racetronix

iTrader: (2)

Nate,

You would be surprised as to how well they work given their size.
Sometimes things do get better over time...

There are a good number of people out there who have purchased them. It will only be a short amount of time until we start to hear feedback about them on the forum. There will be a learning curve but the end result should be quite positive.

JMBLOWNWS6

iTrader: (17)

Jack Im about to sell im 96#ers and versafueler and get these from you!

Racetronix

iTrader: (2)

Don't start pimpin' those warez on eBay just yet... 79's are still a far cry from 95's.

Do you have a game plan?

JMBLOWNWS6

iTrader: (17)

Ill be well under 900 rwhp. Which I have allready pushed the 72#ers from RC to

Big Bird WS6

iTrader: (9)

so how does this low impedence ones work. my goal is 1000 hosre max. but i also want e-85. what can i do to do this. and if i design the kit around 1000 horse( 18psi) what happens when i am on the street and i turn it down to 10 psi or 12 psi. does it flood my motor?

stevieturbo

No. With a speed density tune you can run any boost level, and everything will be working fine if tuned properly.

Big injectors only really become a concern, at low rpm's/loads when small amounts of fuel are required.

But low-z injectors fire differently, and offer better control, which is why they are favoured.

Big Bird WS6

iTrader: (9)

how do i run low?

stevieturbo

With a driver box, such as AEM, Versafueller, FJO etc.

Racetronix do a plug n play kit with driver box to run low-z injectors.

SRT10KLLR

iTrader: (11)

I think Fuel Injector Clinic(FIC) sells 1000 cc(95 lbs/hr) injectors in both low and high imp injectors.

Jason Haines @ LPE

Although those injectors are very high flow for a high impedance injector, they are not the highest flow injectors available.

Bosch Motorsports makes a high impedance injector that is rated at 658 grams/minute at 3 bar (894 cc/min, 10.97 grams/second or 87 lbs/hr at 43 psi (300 kPa/3 bar)). I think the maximum rated operating pressure for these injectors is 8 bar (800 kPa or 116 psi). At 8 bar these injectors would flow around 1074 grams/minute.

Bosch Motorsports offers a gasoline and a methanol version of this injector.

According to the Bosch Motorsports injector sheet I have, the gasoline version is Bosch Motorsports part number B 280 434 499/2 and the methanol version is B 280 434 499/1. I think the last time we purchased the gasoline ones, they sent us the methanol versions (even though we specified gasoline). I am assuming the methanol version just has different materials in it to cope with the different fluid.

We have purchased a couple of sets of these for different project vehicles but be warned, Bosch Motorsports parts are very expensive. I think we paid around $400 or $500 per injector.

BTW - I haver two sets of used ones next to my desk.

Jason Haines @ LPE

We don't modify the injectors.

The 70 lbs-hr injectors we sell on our web site and on eBay are the Siemens Deka injectors. Mototron used to sell them/badge them but they were made by Siemens. These are the same injectors Racetronix, Edge, MSD and others sell as well.

The 70 lbs/hr or 8.8 grams/second rating is at 400 kPa (58 psi), the standard LS1/LS6/LS2 etc. fuel system operating pressure.

At 300 kPa (43 psi), the pressure more often used to compare injector sizes, these injectors flow 61 lbs/hr or 7.6 grams/second.

I think the original Mototron design rating was 10.7 grams/second at 6 bar and that works out pretty close using P/V calculations.

I hope the clears up any confusion on the flow ratings. It can get confusing because unless you know what pressure someone is testing at, you can't compare the flow ratings. Different OE manufacturers and different vehicles use very different system operating pressures (and some vehicles now use variable fuel pressure too). The injector manufacturers design the injectors for the specific OE manufacturers needs so they are designed to flow the fuel flow needed at the pressure the OE manufacturer intends to run. The designed flow for a Ford injector might be at a 270 kPa fuel pressure (and then we go and use it at 400 kPa and, voila, we have a "bigger" injector). A true standard for flow ratings doesn't exist (at least it didn't 5 or 6 years ago when I was part of a SAE aftermarket committee looking into creating a standard). It gets even harder to compare when you start talking about the spray angles. For example, what percentage of the fuel has to fall into the 10 or 15 or 20 degree cone? Not every manufacturer does it the same and not every OE specifies it the same.

Sorry for going on - what was the original question? 8-)

SScam68

iTrader: (20)

Good ****