LT1-LT4 Modifications 1993-97 Gen II Small Block V8

30# injectors too much?

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Old 11-02-2007, 11:47 PM
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Originally Posted by engineermike
You could run 96'ers on a stocker if you change the injector constant (and add an impedence converter).
And performance would suck. Try to get it to not foul the plugs and still have any kind of throttle response.

This thread has now been as dumbed down as is possible.
Old 11-03-2007, 02:03 AM
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Originally Posted by B4C_LT1
will 30# injectors work on a nearly stock car....just have free mods, cai, ud pulley.....just wondering if its too much..??
As said, they'll be fine with a tune. Plenty of us have larger injectors than that on stock LT1s with no problems.
Old 11-03-2007, 05:51 AM
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I run a dry kit and last thing I need is to worry about injector failure, on an n/a car I'd say gizmo is right
Old 11-03-2007, 06:15 AM
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Originally Posted by GIZMO
What would you say if I told you that some people are running 24 lb injectors at 60+ lbs? How about a N/A LT4 running 9.8's with 24 lb injectors? Could you maybe concieve that I am trying to pass on a little bit of real world experience? Save the injector money and buy a good fuel system.

Good Luck,

Daren
Daren,

I'm not trying to disagree with you at all about what you said. I'm just saying there is still nothing wrong with a bigger injector if properly tuned.
Old 11-03-2007, 07:47 AM
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Originally Posted by buffman
Daren,

I'm not trying to disagree with you at all about what you said. I'm just saying there is still nothing wrong with a bigger injector if properly tuned.
You know what? I have read on this forum that most Stock Eliminator racers won't share their "tricks". This has got to be the reason. You guys are addicted to buying the parts and can't be told otherwise.
Old 11-03-2007, 08:20 AM
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Originally Posted by GIZMO
And performance would suck. Try to get it to not foul the plugs and still have any kind of throttle response.
Umm... no. There is no difference in performance. It would only foul plugs and have crappy response if you forget to change the injector constant. With 4x the injector and 1/4 the pulsewidth, the fuel delivered is the same.

Mike
Old 11-03-2007, 08:48 AM
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Originally Posted by engineermike
Umm... no. There is no difference in performance. It would only foul plugs and have crappy response if you forget to change the injector constant. With 4x the injector and 1/4 the pulsewidth, the fuel delivered is the same.

Mike
So, you have actually installed a set of 96 lb injectors on a pretty much stock car? That's interresting. How did it run? How much HP did it gain?
Old 11-03-2007, 01:18 PM
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Originally Posted by GIZMO
What would you say if I told you that some people are running 24 lb injectors at 60+ lbs? How about a N/A LT4 running 9.8's with 24 lb injectors? Could you maybe concieve that I am trying to pass on a little bit of real world experience? Save the injector money and buy a good fuel system.

Good Luck,

Daren

If it's a stock LT4, it will have 28lb injectors not 24 last time I checked.
Old 11-03-2007, 03:12 PM
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Originally Posted by buffman
If it's a stock LT4, it will have 28lb injectors not 24 last time I checked.
Since when did a stock LT4 run 9.8's?
Old 11-03-2007, 04:31 PM
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I thought you were refering to a stock eliminator style car when you said N/A LT4
Old 11-03-2007, 04:37 PM
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I was always told to add fuel by volume not pressure! That sounds *** backwards. When I had my P1sc procharger setup, I had an FMU with stock injectors. I was told to ditch that fmu and add 42lb injectors. Even with a na 383 I was told to run 36lb injectors, your concept is completely new to me! Im not saying your wrong, but you look at setups done at LPE or any reputable shop and they all go with bigger injectors. No matter if its a cam only car or sick turbo setup. Even the 07 z06 uses 40lb injectors.

Last edited by kinglt-1; 11-03-2007 at 04:47 PM.
Old 11-03-2007, 04:54 PM
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Originally Posted by buffman
I thought you were refering to a stock eliminator style car when you said N/A LT4
It was an IHRA Top Stock car. There is nothing in the rules that says you have to run the factory injectors.
Old 11-03-2007, 07:46 PM
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Originally Posted by GIZMO
So, you have actually installed a set of 96 lb injectors on a pretty much stock car? That's interresting. How did it run? How much HP did it gain?
I have 84's on my 8.4/1 compression 388 on the stock ECM. No, a stock motor will not gain power, but if tuned right it won't lose any either. It will not foul plugs and be sluggish.
Old 11-03-2007, 07:58 PM
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Originally Posted by engineermike
I have 84's on my 8.4/1 compression 388 on the stock ECM. No, a stock motor will not gain power, but if tuned right it won't lose any either. It will not foul plugs and be sluggish.
Agreed. I have no idea why the hell he thinks the injectors will make a big difference in drivability.

They ARE NOT JETS. The computer controls the amount of time the injectors is open and when. For less fuel it is open shorter periods of time. It will drive the same as long as it is tuned well...

The bigger the injectors the harder low RPM tuning gets because sometimes it is hard to get the injectors to open and close fast enough, hence richer than ideal conditions. THOUGH 30lbs injectors wont be anywhere that point. I have 42# in a stock Lt1 with a lil boost. Runs like it did stock out of boost.

Only huge injectors are said to have that problem.
Old 11-03-2007, 10:01 PM
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Ok. You guys win. I am through fighting this one.

The fact that I have tons of dyno time and that I data log almost every pass, have set a stack of IHRA National Records in Stock Eliminator, and can cut low 1.3 sixty foot times in a 3200 lb N/A LT1 car means nothing.

I'll try to keep advice like this to myself in the future.

Take Care,

Daren
Old 11-03-2007, 10:11 PM
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I was always told huge injectors are a bandaid for a weak fuel system.

That doesnt mean stockers are fine and to just kill your fuel system with high PSI, but just like everything else there has to be a balance.
Old 11-03-2007, 11:55 PM
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Originally Posted by GIZMO
It was an IHRA Top Stock car. There is nothing in the rules that says you have to run the factory injectors.

Daren, gotcha. I have no idea what any of those rules for those classes are, so I should have asked you to clarify.



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