1000cc injector question

[vxsr33]

I have a r33gtst that is booked for a tune tomorrow.

I have all the supporting mods like r34 highflow, power fc etc.

My goal is about 240 atw

I bought a 1000cc topfeed xspurt injector kit from scottynm35 and even though i assumed they were too big, i was told that they are a much more modern design, can flow well at all power levels and therefore would be suitable for my application.

however the tuner tells me they are way too big and will not be suitable for my goals, he told me he can safely run the stock injectors by upping the fuel pressure with my aftermarket fuel reg.

What do you guys think?

Thanks

[GTSBoy]

Strictly speaking, they are too large.  You'll only need ~1ms pulse width to idle on petrol and you therefore have very little ability to tune the idle mixtures.  But it will work.  Idle may be slightly fluffy, or it could be perfect.

On E85 it would be easier.

But what you were told by others than your tuner is true.  They will work, and they will allow you to go E85 later very easily.

I shudder in horror at the thought of jacking up the fuel pressure to achieve 240 rwkW on factory injectors.

[chiksluvit]

Run the 1000ccs, technology has already advanced so far over the last 10 years, they'll be fine
Upping fuel pressure with stock injectors will only lift the headroom by so much over the 200rwkw, works fine but stresses your fuel pump and affects injector lag time anyway

[vxsr33]

Thanks guys, would it be better to just get some s15 or 550 cc injectors? as im not planning to run e85 and im only going for around 250kw

[Manuel Kasko]

Just stick with the 1000cc, no reason to change them at all now.
If you tuner is still not happy, maybe look for a different tuner because he seems to be out of the loop if he is suggesting to up fuel pressure and run stock injectors.
 

[vxsr33]

My main concern is, will the car run perfectly on the 1000cc injectors? i dont want it to not idle well or run just "fine".
I will speak to the tuner later today about it, but its looking like i will just cancel and wait a bit longer.
it definitely did not seem right to just up the fuel pressure on the stock injectors. The thing is the tuner is very reputable among the skyline and silvia community and i have heard nothing but good things about him.

[Hadouken]

It'll idle fine with id1000's

[sneakey pete]

I've also heard of a well respected tuner saying a similar thing, i find it very intriguing. Anyone i know who has modern 1000cc's, or my modern 850cc's, seemed to run perfect at idle.

[Dose Pipe Sutututu]

If your tuner is smart, and say in the event those milled X-Spurts (I don't have experience tuning them) don't idle well on 98RON, you can drop the fuel pressure to say 2.5bar with the vac hose off on idle (then connect it back once you've finished setting the FPR).

This means now you can run higher pulsewidths and have the correct amount of fuel injected to maintain the idle and AFR of your choosing and you have plenty of headroom for the future.

[vxsr33]

Called up chequered tuning and they said it would be no problem, so going for a tune with them. :-)

i was told the new injectors dont have filters though. Does anyone know where i can get some? (Dont know much about injectors)

[GTSBoy]

The little screens in these injectors can be more trouble than they are worth!

[Humbla]

g had sard 650s in my 33 for 11 years,she is my daily driver and on the highway is great,around town is shit,i just got used to it.

[Cowboy1600]

I've got 1000cc IDs....no issues on idle.  I'm pretty sure there about about 1,000 others on here who'll tell you the same.

Keep the IDs, get a new tuner.

[Cowboy1600]

1 hour ago, vxsr33 said:

Called up chequered tuning and they said it would be no problem, so going for a tune with them. :-)

i was told the new injectors dont have filters though. Does anyone know where i can get some? (Dont know much about injectors)

Very good plan

 

[Dose Pipe Sutututu]

Trent is good, he will sort it out. Seen several maps most of which are very good.

Seen big tuning shops in Sydney with tunes that could be done by a 2 year old holding the number 8 key.