injectors

[VernLee]

If I had lets say a flat 12 sec. car running 42.5 injectors, would I see any difference going to 60lb/65lb injectors.if so how much difference ?
I'm talking about changing nothing but the injectors.
thanks
Vern

 

[BoostKillsStres]

Vern, that would basically come down to the chip. If your having driveability issues w/ your 42's then you'll like the 60's as long as you have a good chip to go with it. If you have a great chip for the 42's then you might not notice any difference. They won't make any more power but you will have plenty of room to grow. And you could have better off idle response if you have any tip-in with those 42's. The 60's run very nice as I moved up to them from 40 red stripes and immediately noticed better driveability. The 40's had a single spray hole, the 60's have 4 and I believe the atimozation helped in that respect.
HTH

 

[VernLee]

BoostKillsStres, thanks for the info, I'm running 42.5 Inj. with a poston 93 chip
Idles ok, alittle ruff, was just wondering If I would feel a seat of the pants difference ? with bigger Inj, and a chip to go with them.

 

[XLR8]

Bigger injectors do not make you go faster. They give you the ability to go faster when you add other parts or start flowing more air than the current injectors can handle.

 

[Razor]

I would get a TurboTweak chip for the 009's.. be very amazed at the difference.

Changing injectors = zero gain unless your old injectors were bad.

 

[VernLee]

Tanks for info guys.Where can I get a Turbo tweak chip ? And I assume I just tell the chip burner what I got for a set up, and they will give me what's best suited for my combo.?

 

[Squid4life]

http://www.turbotweak.com/

Eric Marshall does a killer job! I also have the 42.5's and have heard Eric is the best with the 42.5's as they are a little difficult sometimes. I can't wait to get my car back up so I can see the difference! Give him all your info and you'll be good to go!

Squid

 

[scot w.]

ttt

I just got the mototron 60lb injectors and a turbotweak treet chip I like them! the reason for the up-grade is to move from a te-44 to a 45a w/.63 percision housing.

 

[bruce]

As far as going in a straight line:
What kind of Duty Cycle are you running?.
If you're running a 100% DC, then your out of injector. But, just changing injectors, and chip won't make you go faster, unless you crank up the boost to use more fuel, and that's assuming your engine will respond to the higher boost level.

On the street:
With EFI the way you get accleration enrichment is by holding the injector open, ie it's solely based on time. So with a large injector injector you don't have to hold the injector on as long, since you get a larger squirt of fuel intially. This larger initial squirt helps prevent any tip-in pre-ignition, so the timing can be a lil more agrresive. With a well done chip, a larger injector *always* drives nicer (* again, see the comment about *With a well done chip*).

 

[turbopaul]

Not to hijack this thread, but could someone explain a little better how AE works? Let's say the engine is idleing, then you floor the gas and take off. How long does the AE last? What are the injector PW's doing during this time? Or maybe I should say what are *all* the injector PW's doing? Looking for some actual PW numbers. Inquiring minds...yada ..yada...

Paul

 

[VernLee]

How do I know what kind of D.C. I'm running, what are the indicators, O2's are 810 at the end of a 1/4 mile, .2 kr, sounds to me like I still have enough fuel ??????????????????????????

 

[wants a tr]

it should show INJ DC somewhere on your scantool depending upon which scantool you are using.

 

[bruce]

How do I know what kind of D.C. I'm running, what are the indicators, O2's are 810 at the end of a 1/4 mile, .2 kr, sounds to me like I still have enough fuel ??????????????????????????

If you have Direct Scan, it shows them.
If not then you have to figure the on time, to possible on time, and express that as a percentage.

At 6,000 rpm you have 10 msec between engine revolutions, with SEFI that means you have 20 msec *possible injector on time*. So at 18 msec, your at 90% DC. At 3,000 you have 40 msec, and that same 18 msec, is a little less then 50% DC.

Going by O2s can definitely cost you a set of headgaskets or worse. There is no guarantee that 810mv is safe. I've had 820mv, be 11.7, and 12.5:1 AFRs in back to back runs.

 

[bruce]

Not to hijack this thread, but could someone explain a little better how AE works? Let's say the engine is idleing, then you floor the gas and take off. How long does the AE last? What are the injector PW's doing during this time? Or maybe I should say what are *all* the injector PW's doing? Looking for some actual PW numbers. Inquiring minds...yada ..yada...

That's no small project to document. Stay tuned, and I'll try to put something together, to show and explain how AE works.

 

[BoostKillsStres]

Trubopaul, goto turbotweak.com, downloads and you'll find a very nice writeup on AE along with some other docs.
HTH