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Gt4 Injectors & Stuff.


daktari
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Justa quickie cos i`m busy as hell and not got the time to hunt round for info. :(

The next move on my mod list is to sort out the fueling, I need to get as much info as i can, so i can get the parts ready. . Really want to get it right first time. (Some hope) I`m not planning on replacing any of the engines internals just yet. (In fact i`ll be lucky if i get any thing done just yet :unsure: ) So, questions are.......

1/Can anyone tell me what power the standard injectors on an ST185 can handle???

2/Is there any point upgrading to Mk3 Supra turbo injectors ??

3/What instrumentation would be an advantage to keep an eye on the fuelling?

4/Finally. Adjustable FPR. ? What would be the benefits of fitting one instead of the stock item?

Probably bit obvious but i`m having more than one crisis at the moment and multi tasking don`t suit me. :lol:

Thanks in advance chaps. :thumbsup::thumbsup:

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Justa quickie cos i`m busy as hell and not got the time to hunt round for info.  :(

The next move on my mod list is to sort out the fueling, I need to get as much info as i can, so i can get the parts ready. . Really want to get it right first time. (Some hope) I`m not planning on replacing any of the engines internals just yet. (In fact i`ll be lucky if i get any thing done just yet :unsure: ) So, questions are.......

1/Can anyone tell me what power the standard injectors on an ST185 can handle???

2/Is there any point upgrading to Mk3 Supra turbo injectors ??

3/What instrumentation would be an advantage to keep an eye on the fuelling? 

4/Finally. Adjustable FPR. ? What would be the benefits of fitting one instead of the stock item?

Probably bit obvious but i`m having more than one crisis at the moment and multi tasking don`t suit me.  :lol:

Thanks in advance chaps.  :thumbsup:  :thumbsup:

1/ I think it's around 300 hp at the flywheel, but they're probably maxed out there and you're not supposed to run 100% duty cycle.

2/ Probably not. Mk3 supra made 234 hp, but that was over 6 cylinders. So I doubt that the flow any higher than 3s-gte injectors. I think I have a tech specs for quite a few of the injectors used by Toyota, but it must be saved on my PC at work. I'll see if I can find it tomorrow.

3/ Wideband O2 sensor + supporting hardware (wideband sensors need some clever drive electronics). This place has some good value for money wideband setups, especially if you buy a kit and assemble it yourself:

http://wbo2.com/

4/ No, don't even go there. Adjustable FPR's are the bodge from hell. If you need to raise fuel pressure get a higher pressure static regulator/ replacement spring (if possible? :unsure: ).

Don't forget, you will probably need a higher spec fuel pump (Walbro :thumbsup: ) at some point too. This webpage might be useful to you:

http://www.mrcontrols.com/installs/fuel/FSover.htm

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aalso dont forget you need a way of controlling bigger injectors. the ecu dosnt see how much fuel is going in the engine, just how long the injector is open for. so putting a bigger injector in will sort out hi end boos fueling but cause it to run as rich as h*ll on low speed and idle possibly causing borewash. your next step should be a stand alone programmable ecu with the injectors

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another thing to know, the standard 185 fuel rail can't cope with any higher than about 280 bhp, as no.4 runs lean, you'll need to get a new fuel rail to go with any bigger injectors and a walbro or supra fuel pump to keep up with demand. theres a GB on the OC for wolfkratz ones ;)

like it's been mentioned you'll need some control over your duty cycle after fitting bigger injectors, personally i'm using an e-manage but there is plenty of options, just try to avoid the uni-chip if you value your engine

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Cheers dude. Glad you mentioned about the unichip. Confirms my suspicions. I was toying with getting one fitted but had been told of `issues`with them. I take it you`ve had no problems with the e manage system.? Also i believe there is a modification that can be done with th estandard fuel rail. Involves utilising the 5th injector outlet... any ideas or is it just a myth? :thumbsup:

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it's more of a myth, there's been tonnes of descussion on the GT4OC about it a few months ago when someone thought of creating a duel feed rail out of the standard rail. to cut it all short, everyone agreed your better off getting a wolfcratz one as they've been thru testingto ensure there is no pressure drop and no danger of running lean.

i've not had a single problem with my e-manage yet, takes about 45minutes to fit, as long as it takes to map and you have a whole new driving experiance once your done. definately worth getting if your tuning on a budget, if your going all out go get yourself a MoTeC and enjoy all the extra toys that come with it :D

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