I have s4 fuel rails and im looking to upgrade my 4 injectors.

High imp gives better injector control? Money is not an problem for my injectors.

Looking for a high quality injector in high imp if possible that is direct fit. Rc's are thing of the past right?

 

your ecu(or wiring harness for stock ecus) decides high or low imp, not you or us, you can pick the flow tho

 

The Injector Dynamics ( http://www.injectordynamics.com/ ) injectors seem to be the current fad on this forum.

They have a number of large, high impedance injectors available.

Note that in order to make use of them properly, you need an ECU which allows you to enter lag times, injector trims, etc. etc.

Their website has a lot of data, but I wonder, does anyone have any data comparing these injectors to "normal" injectors in the real world?

I don't think they are quite drop in though. Off hand, I don't know of any large high impedance injector that is. Even most of the bigger low impedance injectors aren't.

 

I have a haltech e6x.

I wanted these injectors big enough to eventually go e85 when it makes it to town.
The ID injectors have about 4 to 5 different injector dimensions. I will have to look into the injector sizes that are on the car to compare.

Direct fit is the most important. I refuse to buy another fuel rail.
If i must i would go with rc's with 850 primaries and 1600 secondaries. WOuld that be enought injector for about 350 whp on e85?

IF i could find the ID direct fit i could use 1000 primaries and 2000 seconds.

 

the rc high imp 720's(or is it 750s) are drop in.
do you think the stock rail can flow enough to support 1000's and 2000's of e85, even in a parallel? food for thought.

 

We sell ID injectors with the correct adapters to drop right into s4 rails.

 

http://www.turblown.net/store/index.php?productID=63

 

Turblown thank you for the info.

Could you share some information on the ID injector adapter?
It says the 11mm will fit stock s4 fuel rails. I was just at the ID injector web page and they sell a 11mm size. WOuld that eliminate the adapter?

These are the sizes dimentions i was looking through. http://www.injectordynamics.com/ID20...t%20Dimensions

 

The adapters we have are from injector dynamics. Same thing. You have to use an adapter if you want them to bolt right into your fuel rail.

 

Cool. IS there a forum member discount? =)

I will be ordering in about a month or so.

 

I was skeptical too, and at first I thought they were just another "gee whiz" marketing gimmick. Turns out they are rebadged versions of the recent Bosch EV14 design. FiveOmotorsport also sells EV14 family injectors and so do other vendors. The FC rails need an 11mm o-ring at the top and then at the bottom it needs a 16mm seal.

The reason why the Injector Dynamics injectors are good is because they are just new generation Bosch injectors. It's like buying MSD parts that are really just rebadged GM designs. All injector dynamics does is flow test the injectors and sell matched sets (which is IMO not even necessary) with individual injector lag data and flow rates. ID is trying to sell you on the matching service which is built into the price of their rebadged Bosch injectors.

 

Either way.. Im getting them...

Turblown. The injectors on your website ARE direct fit correct? And it comes witht he plugs and pins which I WIll need.

 

I'll give my 2 cents worth. Maybe rotary PHD's will chime in.:

~85% more E85 is required by weight than gasoline for the F/A ratios be the same. However E85 has ~27% higher thermal energy by weight.
So you'll need ~67% (85%/1.27) more E85 than gasoline to produce the same HP.
I have disregarded viscocity so requirements should be a bit different.

Now, e.g., to get 450 HP @ the crank using gasoline, ~ 3750 cc/min (~365 lbs/hr) of total injector size is needed ASSUMING .80 DC and .65 BSFC.
Sooo, for E85 you'll need ~6262 cc/min (1.67*3750) total injector size based on the above ASSUMPTIONS.

 

Well you made it way to hard for yourself.. It has been said piston engines need 40% bigger injectors to make same HP on e85..
but 67%?

I should be able to make 350whp on race gas with 720's and 1600's so im assuming 1000's and 2000's should be very close for e85...

 

I have a tendency to comfirm/disprove hearsay. The data came form this post w/in one of Howard Coleman's thread: https://www.rx7club.com/showpost.php...03&postcount=6.

"Typical gasoline Thermal energy 19,000 BTU/lb max power fuel air mixture 12.5:1
Typical E85 Thermal energy 13,475 BTU/lb max power fuel air mixture 6.975:1
Typical ethanol Thermal energy 12,500 BTU/lb 6.429:1

If you are consuming 100 lbs of air, lets see how much fuel energy you release for each of these fuels.
100/12.5 = 8 lbs of gasoline @ 19,000 BTU/lb = 152,000 BTU
100/6.975 = 14.337 lbs of E85 @ 13,475 BTU/lb = 193,189.9 BTU = 127% more heat energy
100/6.429 = 15.555 lbs of Ethanol @ 12,500 BTU/lb = 194431.5 BTU = 128.9% more heat energy"

And I agree I made it a bit complicated. 40% does seem right. Simply needed to divide gasoline's 19,000BTU/lb by E85's 13,475 BTU/lb.

 

I would go 2000x4 but i want to have a good idle and have descent MPG's.

 

Injector Dynamics ID2000 injectors will be able to easily have a good idle there is a video with an stock integra with ID2000s and with tuning got a really good idle and excellent AFRs. Just so you know the ID injectors are extremely linear, the 725cc versions can accurately control fuel down to 15cc.

 

Idle will at this point depend heavily on the EMS's ability to accurately run low pulse widths and trim fuel per injector. Any modern injector is going to be almost on par with the ID injectors. The ID injectors just have a leg up because they are selected as matching sets and you get latency information when you buy.

 

I ended up buying 2x ID1000's and 2x ID2000's.

It was a pretty penny but im sure i will be happy.

Now im getting into the question of whether or not the rest of the fuel system can take e85... And can e85 be premixed? IM getting in deep=/