masonracing

here is the new build.

laskey built 85mm bottom end. 11.5.1 compression

skunk2 pro1 valvetrain.
stock TB and intake manifold (rule in my class)
4to1 header

last season i ran stock injectors. more then luckly ill be over 200hp with this setup. what can i get away with for injectors?? thanx

DirtyDA9

I would go for something like 330cc's, something around there would be good. What about pump, fpr, and tuning device? What are you using for those?

masonracing

i run a inline high pressure airtex pump. not sure on lph's. no fpr. its going to be tuned with hondata.

what do i look for when buying injectors? mine r obd2

masonracing

my pump is 135 lph....basically stock

DirtyDA9

Well really it doesn't matter what size you run, because you can always adjust pulse width and duty cycle. So in all honesty you could run 1000cc if you wanted and they will be tuned down to precision. But it's better to go higher cc and tune down, then to go too low and not be able to tune up. So maybe go with DSM 450cc injectors and get a good tune.

DirtyDA9

I would go with something like 330-450cc. DSM 450's can be had for $45

masonracing

good info for me...thank u

mark@silbernage

I was looking around recently and read a bunch of posts on Injector Dynamics... here's a good example: http://forums.clubrsx.com/showthread...7#post36562986

They seem to have a good pattern and perform well at idle even with the higher volume versions - you might consider their smaller one (750cc?) as it seems to have more than enough capacity for growth without sacrificing idle/off idle performance.

I know opinions abound, and it's challenging to find objective (measured) ones with all the seat-of-the-pants and truisms out there.

Perhaps someone here has experience with them? I have a similar setup to the one you're describing and that's what I'm leaning towards when the $$ become available.

BTW- I agree with the 330cc -ish sizing if any other injector were being considered; it's about right considering the application.

Food for thot..

DirtyDA9

No problem. Good luck with everything.

I forgot to mention that if you do go with DSM 450's, they are high impedence, so you will need to splice in resistors into each injector wire, or get a resistor box from like a 91 integra.

I forget which size resisters you use, there are plenty of write up's on it, and they are only like $5 for all of them from radioshack.

GagnarTheUnruly

iTrader: (3)

ID 770s or 1000s

OH_1fstgsr

iTrader: (2)

ID 725's
or FIC's Fuel Injector Clinic
or Deatschwerks

All of these injectors use newer technology and have a better spray pattern. Thus making more power.

Zarma

I would go with 770's thats what I am using for my build. However I am also running E85 so needing a little more.

I remember reading through one of profunctions builds from MikeySpec. He was running 85X89 build, and if I remember right it was with 770's and E85 as well

Here is the link feeling kind of lazy and don't want to read through all the pages.

https://honda-tech.com/forums/all-motor-naturally-aspirated-44/profunction-kinsler-present-epic-all-motor-bseries-manifold-testing-2841539/

As long as your tuning and have an an adjustable FPR then more is better.

masonracing

thanx for the info everyone. liking the looks of the Deatschwerks 550's.

next question. i plan on buying walbro 190. do i really need an adustable fuel regulator? can u please explain/recommend 1.

yungkhmer

cheap, DSM 450's,walbro 255 and a blox adjustable fuel pressure regulator and gauge.

DirtyDA9

Yes you will need an FPR, I have always used Aeromotive ones on my DSM's, they work great.

OH_1fstgsr

iTrader: (2)

I can only assume that the car will be tuned on Hondata, Chrome, Neptune or something. No need for a FPR, stock fuel pressure will work fine.
Replacing the fuel pump isn't a bad idea, some of these parts was way over 10 years old now.

racebum

backwards. low impedance injectors use the resistor box to come up for the 94+ cars.

if you could get a set of dsm 450s cheap they would be more than enough. and or if you wanted to kick the resistor box, you could do something like:

http://www.ebay.com/itm/4-380cc-DENS...#ht_1749wt_928

i would not use big big injectors for an NA honda. yes you can tune them but they are way out of the optimum range when you run them at a 35% duty cycle.

using the calc here http://www.fuelinjectorconnection.co...widercalc.html

if you guess 230 crank hp out of that engine with a typical .5 BSFC it puts you at 377cc's at an 80% duty cycle which is just perfect for the denso's in that ebay link

thenoxus1

I've heard great things about using the RDX injectors as well. Solid upgrade, good spray pattern etc