Wednesday, October 04, 2006 - 02:33 pm, by: Brett Lauria(Brett_lauria)
Okay boys&gals the story is, blew the head gasket, so during the period of it being apart i brought some bits for it,a stainless exhaust,to4b with a 3" back to cat system,40mm external waste,big cooler,1.4mm head gasket,big end shells,waterpump,timing belt,thermostat,and i ported the the heads CC'd and polished the chambers and old pistons,i know il need a boost controller but what else?how many rwkw roughly?
Wednesday, October 04, 2006 - 02:54 pm, by: Brett Lauria(Brett_lauria)
Also could i use an actuator that would run off a boost line to open and close a fuel line to a 7th injector so when the car comes into boost it squirts or is it easier to get an adjustable fuel pressure regulator to run it richer,also what size are my standard injectors?will the standard trans hold up?have many people gone down the same track?how do you guys think it will go?
Thursday, October 05, 2006 - 07:17 am, by: Daniel Clarke(Dieseltrain)
Extra injectors are the Dodgiest way to overcome small injectors. Sure it was great back in the 80's and early 90's, but its such a waste of time. You will always get a MUCH better result when going bigger injectors, bigger fuel pump and some form of engine management.
Fitting and extra injector will still need some form of injector control. Fuel lines, and wiring and plumbing into the pipe near the throttle body + the price of 1 x 700+cc injector.
For all that money, it would probably pay for an Greddy Emanage or even a set of injectors + a fuel pump.
You will be much happier having a proper system installed and tuned. At least you will be able to get the best tune out of it.
The problem with Piggyback INjectors installed in the pipework prior to the intake manifold, is it will NOT give you an even fuel mixture accross all 6 cylinders. You will always find, a couple of cylinders (in this case a front mounted throttle body on a manifold) will always get more fuel than others. Thus not having an optimal yet EVEN tune. Sure the Afr's might be reading nicely on the dyno, but that is for all 6 cylinders( if using a Lamda afr analyser) But the fact might be, some may be running 11.0 and others up to 13.0. ( dont quote me on these figures, but gives you an idea).This can cause detonation problems, and lean AFR's in some cylinders and can cause engine damage.
You will always notice any kind of extra-injector setup runs as rich as a pig. Thats just a sure way of making sure there are NO cylinders starving for fuel. If this is the case, then you are probably losing power from an overly rich tune, which defeats the purpose in the 1st place...
So definatley go Bigger injectors + fuel pump and some kind of management, and you will get More power and a more Reliable tune. You wouldnt wanna put all this together and blow something again.
Cheers, Daniel.
P.s. I used to own a VL turbo with extra injectors, Even after removing them and changing to bigger injectors and management, we still made 17rwkw over the extra injector setup. And we confidentally knew it was a good tune in all cylinders. All this info was explained to me at the time by a reputable tuner. And this was 8 years ago, and this guy is still in business now
(if anyone was too lazy to click those, links I highly recommend that you go back and do it )
Need more specs on the t04b but AFAIk they are usually around 57mm comp inducer. This is similar to a GT30 in size. I would look into the things that Shane said.
Oh BTW the way you referred to with an extra injectors is definitely the WRONG way of doing it!
Push the turbo to the limit It will have some topend balls with the ported heads, cams and centerlines adjusted to suit the cams. Having the exhaust centerline out of 'synch', retarded 2-6 degrees always helps topend for a minimal drop in idle vac.
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