Anyone tried firing leading and trailing plugs at the same time, PFC or other ECU?

[mx1311]

oh and mark i wouldnt be suprised if your car just runs on just leading with your new spanky coils, willdays is

[BlitzBoy]

haha if thats the case they will be flamage out the back

[royal]

just buy the pro chip ed is selling on fduk then apexi will more than suit your needs and you can still tinker with dataloggit as there are lots of forums on rx7club to give you pointers

The Apexi pro ecu is no use to me. Granted having spark cut for the limiter would be safer but the chances of it making any difference are very slim. 0 mph limiter is for drag. I\'m on the rx7club forum already, trying to learn a thing or two about whats out there.

[royal]

just out interest,  would these non rotary ecu\'s be able to run primary and secondary injectors?

On this subject. I\'ve been trying to read a million books over the last week or two to understand how this all works. When I\'ve read about secondary injectors (in a boinger context) it talks about having the secondaries further away from the cylinder in order to break down the fuel but also to cool the intake air. They run the primaries at lower rpm and then swap to the secondaries at high rpm. I assumed this is the same system as in a rotary? could someone confirm this ? :bandit

[Hayward North]

KevYorks is very keyed up on the haltech, a very flexable piece of kit imo and probably the direction i will eventually go a little further down the line, the map resolution is better for a start and depending on the model you get they have masses of inputs and can run 8 injectors that you can stage at whatever time you like, so you can run alkey and water though some of the injectors.

[BlitzBoy]

. They run the primaries at lower rpm and then swap to the secondaries at high rpm. I assumed this is the same system as in a rotary? could someone confirm this ? :bandit

Correct :cheers

[royal]

KevYorks is very keyed up on the haltech, a very flexable piece of kit imo and probably the direction i will eventually go a little further down the line, the map resolution is better for a start and depending on the model you get they have masses of inputs and can run 8 injectors that you can stage at whatever time you like, so you can run alkey and water though some of the injectors.

Thats interesting, I\'ve noticed lots of people on Rx7club are using that. I\'ll take a look at it a bit more. One of my main things is I want to be able to do everything myself and not be locked into relying on a tuner that isn\'t nearby or able to fix it without notice. Even if later I strike up a relationship with a tuner, at least then I know what I\'m doing and not blind following.

The resolution thing seems like a bit of a red-herring to me? the magic boxes just plot a nice curve through them anyhow don\'t they? I could see how it would make a difference with an engine that was really low reving so you would need to really drill down but the rotary is very high reving so I wouldn\'t have thought you\'d need all that extra resolution as it would just make it more work? all my random guesses though so probably missing a point somewhere??? :King Haltech looks like its got plenty of bells and whistles though and having lots of users already should be less hassle.

[BlitzBoy]

There you go Haltech E6X, works out to be £850 landed in the UK includes the Loom for you to wire up into the existing sensors but you will need to get rid of your current ECU loom.
Has lots of features to play with.

http://www.tweakit.net/shop/product_info.php?cPath=57_24_86&products_id=90

[BlitzBoy]

woops almost forgot you will need the connector kit as well
http://www.tweakit.net/shop/product_info.php?products_id=84

[bnaellis]

I run my leading and trailing together from vacuum to about 4-5 psi
that\'s on an apexi pfc.


rgds

Brian

[royal]

I\'m going to look into the Haltech further but  I can\'t really see thats its going to achieve anything for me over the PFC? All in after shipping / VAT thats well over a grand which is nudging Motec territory. The DIY things I\'ve been looking at are around £400 quid and include a built in wideband. They\'ll be a lot more trouble to set up but understanding it all is part of the reason for me looking at it in the first place.

I\'ve just had confirmation that VEMs does handle secondary injectors by the way the trailing/leading spark thing is still a worry though. I\'m concerned that the guys who have just run leading plug are all short duration drag cars so completely different to my needs. Do you know anyone that is running just leading plug in any circuit cars? drift cars get very heavy abuse with little air flow so I need to get it right.

[royal]

I run my leading and trailing together from vacuum to about 4-5 psi
that\'s on an apexi pfc.


rgds

Brian

Hi mate,
 Thanks for posting. Is your car primarily drag or circuit as well?

Does anyone know what the usual split is?  I\'ve got primary at 5 degrees and secondary at 15 degrees in my head but can\'t remember where I got that from so may be completely wrong! does this stay the same throughout the boost range or is there anything to benefit from changing it as boost grows?

[bnaellis]

Hi mate,
 Thanks for posting. Is your car primarily drag or circuit as well?

Does anyone know what the usual split is?  I\'ve got primary at 5 degrees and secondary at 15 degrees in my head but can\'t remember where I got that from so may be completely wrong! does this stay the same throughout the boost range or is there anything to benefit from changing it as boost grows?

Primarily a road car, although have not  driven it in nearly two years but that\'s another story. It\'s not primary and secondary. it\'s leading and trailing.
It\'s best to experiment on the dyno and see what the benefits are. On some cars I have seen considerable gains in playing with the split, on other\'s it\'s been next to nothing.
Typically the more boost you put through the motor the more yopu increase the split timing.
The splt you mention is typically whats seen at idle.


rgds

Brian

[BlitzBoy]

Does anyone know what the usual split is?  I\'ve got primary at 5 degrees and secondary at 15 degrees in my head but can\'t remember where I got that from so may be completely wrong! ?

err I think you are getting confused with injectors now lol
12 degrees split between the Leading and trailing is quite normal on boost
Not much is gained with running less split on boost anyway.
As Bri has said and few other posts before it, running 0 split in some vacuum cells will yield better fuel economy.

[royal]

Sorry , trying to learn about a thousand things in one go! meant leading and trailing. Thanks for all the answers . I\'ll no doubt be back with more questions in about 30 seconds!