Lude Generation

swapping the head today on the BB4, i need to know what injectors are better to tun with the atr head and intake, and why?

the 290cc atr ones or the 345cc prelude ones.

if the prelude ones are better, what exactly do i have to do to fit em?


Thanks in advance

The atr ones are obd2a and wont run on a prelude ecu they are also high impedance so dont need a resistor box.

Have a look at rosko racing https://www.roskoracing.com/cgi-bin/com ... =100-001-C

And this guide http://www.extremeprelude.com/euror.html

Rosko used to have a very good guide but can't see it now?

Edit: there it is http://roskoracing.com/TechBlog/?p=87

4thgenphil wrote:The atr ones are obd2a and wont run on a prelude ecu they are also high impedance so dont need a resistor box.

Thanks for the info,

done a bit more digging.. I dont want to have to remove the manifold again to do work to the manifold so ive found that s2000 injectors are a good swap, but again these run obd2 so the plugs would need spliced into the loom
Not to enthusiastic about needing to splice wires so ive found a set of obd1 to obd2 harness' for the injector plugs I can buy.

so my next question is, How do i go about running the obd2 injectors once pluged in, Ive read it needs modifying but no specifics, also read i need to plug something into the resistor plug on the loom to remove the resistor, like a dummy plug.. people have made them but not sure what to do there.

I would just use the OBDI Prelude injectors and sidestep the issue.

Merlin wrote:I would just use the OBDI Prelude injectors and sidestep the issue.

ditto, much easier option as I said on fb

does the prelude fuel rail fit the atr manifold ?

lucas wrote:does the prelude fuel rail fit the atr manifold ?

i can answer my own question, it doesn't

so looks like the prelude injectors are slightly longer so need to space the mounting brackets out, i will figure that out.
and i will also need to extend the fuel line to reach the other end of the fuel rail.

i will take the manifold off today, really didnt want to though , and grind the ports..
while its off though. will i still need to plug the air holes for the injectors as im running both the atr manifold and head ?

or will i need to plug them as im going to use the h22a injectors ?

only other thing im needing help with is map sensors and the iacv etc etc.. clueless when it comes to that and not sure what to remove, keep and relocate etc
any help greatly appreciated

thanks guys.

Have a look on rosko racing mate, the sell the adaptors for the injctor fuel rail aswell as the iacv plate, they see an specific throttle cable adaptor aswel but i dont know if you really need it

i have a simple adapter made for my fuel rail. im running 550 RC injectors so i needed to solder the resistor wires together.

i also had the injector holes widened at the bottom on the atr inlet. ive plugged the small vac hole at the rear, bottom of the inlet as i dont think its needed. egr i blocked. iacv i bought a roscoe racing adapter and put it at the back where it is on the atr. the intake temp sensor you can just cut the lude loom plug and wire into the atr sensor any way around as there are only two wires and it doesnt matter which goes on which. i bought the roscoe throttle adapter but as phil says, just bend the old one down lol

thats all i can think or atm pity photofuckit kicked in yo otherwise i'd link you to my build thread but thats pointless now until i sort out the photos