fd3sguyy

iTrader: (2)

Hey guys,

I really would like to get my car running by the summer with 1000cc primaries and 2000cc secondaries but it looks like it might be a little over my budget for now. I do have 850 primaries and 1300cc injectors lying around from my BNR stage 3 setup I had before.

My current mods are,
Street ported engine
RX7 store gt40r dual ball bearing turbo kit
3 inch midpipe + 3 inch exhaust
Walbro 450 LPH fuel pump


my question for you guys is, can I reliably run this setup? or should I just wait for the funds to get the 2000cc ID injectors. I've found one person with a similar set up but I was not able to get in touch with them. At this point I just want to drive my car, I'm not worried about HP numbers. Summers here in Canada are so short haha,

Thanks in advance,
Andrew

WANKfactor

iTrader: (1)

https://www.rx7club.com/single-turbo...st-one-869614/
https://www.rx7club.com/single-turbo...e-e85-1056358/

A bit of light reading until someone with more specific 1st hand experience chimes in.
It is my understanding that you want more fuel than turbo when selecting components in case of an overboost situation.
All the number crunching has been done in the above two links.

fd3sguyy

iTrader: (2)

Yeah I was worried about the boost creep too. Thank you I'll read up on it

DriftDreamzSS

iTrader: (4)

It would entirely depend on your planned high boost setting and power goals, there is a fuel calculator link somewhere on here that I have seen that will help you. Did you have a wideband on your previous setup with the 850cc primaries? My personal experience is that those injectors are junk and not capable of running lean enough for a proper afr at idle without running negative lag which doesn't seem like the right way to do things. Are you sure you need 1000cc primaries, will you be running e85? Stock 550's with 2000cc secondaries will supply a pretty healthy amount of power.

Marf

1000cc primaries is massive overkill

Do you not want it to idle normally?

I'm actually looking at downsizing the primaries and going much bigger on the secondaries for my single setup. Should aid idle and cruise tuning.

KNONFS

iTrader: (14)

Depends on the ECU, the haltech sport ecu is able to control the 1000cc primary injectors with no issues; in fact, I've been thinking of swapping them out for a set of 1200cc

Marf

What's your idle AFR?

fd3sguyy

iTrader: (2)

With my previous setup it was my afr was sitting around 14-15 although it would idle very rich on hot starts. I would like to run e85 in the future but right now that's not a priority. But that is good news maybe I just need the secondaries

fd3sguyy

iTrader: (2)

I have a Power FC, do you think it could handle 1000cc?

fd3sguyy

iTrader: (2)

I had a previous thread where I was told to run 1000 primary for safety and because I could get them for the same price in the kit. In the future I would like to have 450whp

KNONFS

iTrader: (14)

Originally set around 12.6 afr at idle by my tuner. It has been adjusted to run leaner (around 13.4afr), and currently set on closed loop (fuel) at idle at 13.7 afr. Idle hunts a little, I upped the idle from 800rpms to 1000rpms on Saturday, too early to tell if the idle hunting got better.

My experience is solely based on haltechs

WANKfactor

iTrader: (1)

I would have thought modern hi-res 1000's as primaries would be superior to old 850's. I'v got idle with ev14 1000's on my flintstones microtech. Bigger issue with that ecu is staging - having bigger primaries helps with that.

KNONFS

iTrader: (14)

^This

My injectors are the EV14 style, sold by FIC, and yes, the staging is a PITA for me, probably because of lack of experience

fendamonky

iTrader: (6)

This is not good information.

If you have quality parts (ID/EV-14), NOT some bored out 850's, and a tuner who knows what they're doing than it's perfectly fine to run 1000/2000 injectors. It is very possible to have 1000cc primaries and maintain a steady idle and cruise map with good afrs.

Marf

OK happy to eat my words... but what is a "good afr" at idle in your view?

I know what the yearly government test dictates for idle lambda my car in the UK, but what about you guys in the states?

What's a pass/fail in terms of idle lambda?

fendamonky

iTrader: (6)

We don't have the same MOT requirements as you fellows in Sunny England

Emissions testing is location based. It's been a while since my FD ran (lack of finances has slowed a rebuild down to a crawl/stall) but if I remember correctly I was running mid/high 12 to 13 afrs at idle.

Needless to say, when I was living in the UK the tune that I got (and passed MOT with) from RE:worx was MUCH richer and worse (running 850/850) than what I saw running 1000/2000cc injectors on the exact same PFC.

The new technology EV-14 injectors REALLY ARE that much better when you're getting them from a reputable company!!!!

Tuning4life

iTrader: (2)

if you run 1000CC primaries on a powerFC you will need to run negative injector lag.


I run 650cc and 2000cc EV14 injectors on my car and it runs perfectly, even at the high altitude I live at, which needs less fuel for idle.


Idle for most cars will be 12.7 to 13.2 AFR for a good solid idle.


I tuned a couple of cars with the powerFC with the above and the cars all run spectacular. Very smooth.


Staging on the powerFC isn't tough. If you are way off the car can buck, if you are close you can see a dip in the AFR. typically you can put a short time to ramp up the secondary injectors and this usually cures it. the transition time. If you still have trouble, lower the transition percent a little.


on my GT3574R at 17PSI I was using about 72-75% injector duty cycle dependent on air temp. I have a fuel pump wired directly to the battery, Supra TT denso.

fd3sguyy

iTrader: (2)

Thanks for the reply, definitely a lot of help. From the looks of it I'm going to run that setup. I'm going to upgrade my secondary to Injector Dynamic 2000cc