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Injectors too big? 

 

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 Post subject: Injectors too big?
Posted: Sun Dec 02, 2007 9:06 pm 
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Some ppl here know of my project... Turbo V8 302 in my NC Fairlane. I have a T-70 running 10psi into a pretty much stock engine (cometic gaskets, rebuilt, acl race bearings etc...), and i have bought a Pro-m maf calibrated to suit 42lb injectors and the injectors to suit. Still running the stock fuel reg but with a walbro 255 intank pump. My question is...are these injectors too big? And if so, is there any harm in running injectors too big?
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Posted: Sun Dec 02, 2007 9:07 pm 
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oh yeah...will be setting ignition to 6deg retarded from normal timing
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Posted: Mon Dec 03, 2007 9:44 pm 
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anyone?
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Posted: Tue Dec 04, 2007 2:36 pm 
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they shouldnt be too bad....Im running 42lb injectors in my ef turbo six....

 

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Posted: Tue Dec 04, 2007 5:44 pm 
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It really depends on how the tune is...

I was told by the bloke doing my blower on my 5.0L that 24lbs were good for up to 380rwhp, though bigger was better. Ideally he suggested 30-36 lb's as good enough with enough breathing space.

You should be fine though, the tune will dictate how they will work and You'll have a fair bit of head room before they max out. Can't really go too big as long as you have enough delivery from the fuel pump. The walbro is a good unit.

Just out of curiosity, What sort of boost are you planning to run?

 

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'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Tue Dec 04, 2007 6:43 pm 
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intending on 10psi while im building a stronger bottom end...but im really keen to see what i can make power wise on the stock eec
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Posted: Tue Dec 04, 2007 8:02 pm 
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What sort of tuning are you using? Chip or aftermarket ECU?

And the Pro M would be an 80- 85mm??

Should be a pretty good combo.

 

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Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Tue Dec 04, 2007 8:09 pm 
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neither at the moment...using a pro m maf calibrated for 42lb inj and have fiddled with the timing a bit...i havent driven it yet, im getting it dyno'd next week to check out ratios and see just how effective the combo i have is...then thinking of going a haltech
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Posted: Tue Dec 04, 2007 8:12 pm 
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Good stuff mate, Definately will be interested.

 

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Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Wed Dec 05, 2007 9:53 pm 
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42's would be fine.. If maf is calibrated right....
Its the idle where there maybe issues..
But plenty of U.S guys run more than 42's on there eec's.. A9L especially, with TwEECer....

 

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Posted: Wed Dec 05, 2007 10:00 pm 
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idle problems...i already have idle problems...? if i rev it, and step off the throttle, it nearly stalls before settling back to idle?
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Posted: Wed Dec 05, 2007 10:05 pm 
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Try lowering fuel presure with an adjustable fuel reg?? Adjust tps lower??? You may have turned idle screw up due to changed ignition timing...
This would take TPS voltage above 1v .. Check..

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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Posted: Sat Dec 08, 2007 10:48 pm 
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I build a turbocharged mk1 capri several years ago, running fuel injection with larger injectors. i don't recall the size of the injectors, but they were quite bigger than they needed to be. and even with the wolf3d v4 the bloke that tuned it (errol from efi dynamics) couldn't quite smooth it out, as it was idleing and running a little rough till about 2200rpm.
i mentioned to him that the injectors were quite big, and he said 'that would play a part in it'.

once you get ur aftermarket ecu, i'm sure they'd be able to tune it out.

if in the mean time you want to rule out the injectors as an issue, call a tuner, not a mechanic, but a tuner and see what they say.

IMO, it sounds like the ignition timing could be the issue.

When you find out what's causing the prob, post it up!
Good luck with it!
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