blackeg

definitely good information in here guys!

injectors you probably want to run a bigger injector that oem 240cc its not worth it. in my noob ignorance im running oem prelude 290cc injectors up around 50psi it makes them behave like a 310cc or so. perhaps the increased base pressure will help with atomization but who knows.

you dont need an upgraded fuel pump, my dozen years of playing around with turbos and widebands says that you can run an oem pump farther than you think into the 200's for hp and not experience lean conditions or major voltage drop

DDTECH

ID And FIC or SBF are hands down probably some of the top companies that can supply the best injectors - all "I believe" use EV cores from bosch. I'm very fond of ID however because Paul Yaw has shared a lot of insight with me..

For Example, for my setup - he recommend the 725cc ID's. I just recently converted over to direct port, New 1 lobe cams and I told him what I had experienced with the RDX's, he recommended the 725's because of how they fire and when they fire, allowing for better mix with the nitrous.. it was a lot of inside racer info that I can't really share at this time , but I can tell you, something that's always stood out to me, is if you can talk to the owner or designer of the company, that's always made me more of a Fan.

the171

Rdx + walbro 255 + aem fpr is a great combo. Cheap, effective, and more than ample for most of us. Obviously the above more advanced guys will take it to the next level.

Keeping the original 20+ year parts makes no sense to me, especially if you're investing in a motor. It might work ok with the original pump but for the $100 that a new high flow pump costs you can be confident that new motor isn't going to go lean. Plus you have full adjustability and can easily adapt to future changes.

xtrac1

iTrader: (2)

What sort of research have you conducted?

spAdam

iTrader: (1)

About as much as one can do sitting in front of his computer during his lunch hour

Honestly, I probably put more thought into than I should have. More than anything, I just wanted to make an informed decision. I also tend to look at every thing I do to my cars as an opportunity to learn something, and since I don't have a shop I do business with or anything I have to make myself the expert for everything I try.

Mostly, I read SAE technical papers & trade magazines, manufacturer data sheets & releases, and look at what the OEMs & motorsport manufacturers are up to.

To a lesser extent, I check out aftermarket product reviews and forum threads, but those (obviously) tend to have almost no quantitative data to help me make a decision.

In this case there was also quite a bit of poking sticks around intake ports of a spare head and manifold calculating angles and distances. I ended up with ten pages or so of notes in my book when it was all said and done but still went with something that was "close enough."

Like I said, I'm probably overthinking it, at the end of the day I'm still screwing around with an old Honda that I use strictly as a commuter. My original intent was to find something that would plug up without adapters, have better performance at low pulsewidths, have better spray patterns/angles, and that would allow me to play with higher pressures down the road. I started looking at the EV6 style (iirc) and ended up here. I got most of what I was looking for.

HiProfile

I haven't updated things on my website, here's the new OBD2-EV6 adapters next to the OBD1-EV6 adapters:



I just got from a 350 mile trip and my mostly stock H23A-vtec (K20A intake manifold) got ~37mpg using my IN390 injectors. They have a single conical spray vs the dual cone spray of the IN400's, so the IN400's may be even more MPG-efficient. It's the best gas mileage I've got since my D15B2. Do note they're running at 4BAR fuel pressure, a consequence of the F23A fuel reg I'm using.

spAdam

iTrader: (1)

^Very cool.

I've been real happy with the injectors I got from you. My mileage also went up measurably It has been down a little lately as I tick through some mechanical issues that come with a 230k mile car but I'm sure I'll be back up there soon.

kulo

Rc310s or rdx? For itr motor with bolt ons
looking around 210hp 140tq

UncleD

iTrader: (2)

RDX^

Have you read any of this thread?

OMG

what fuel you running, kulo

Lonewolf1983

got my injectors today, great customer service from Hiprofile.

Cant wait to slot them in and get tuned

pithor-c1

iTrader: (1)

I JUST TRY TO START A THE ENDS OF THIS YEAR A YOUNG B "86X89" N/A AND MY GOAL IS 300+WPH BUT I WANT TO KNOW IF MY 1000cc ID`S AND WALBRO 255 + Q16+STOCK LINES DO THE JOB ? OR THE 1000cc ARE TO BIG FOR MY SET UP? MY FUEL PUMP 255LPH ARE TO SMALL? THANKS!!!

m4xwellmurd3r

IM NOT SURE WHAT YOU'RE SAYING. ARE YOU HARD OF HEARING? IM SORRY BUT YOULL HAVE TO STOP YELLING SO I CAN UNDERSTAND WHAT YOU'RE SAYING