mnorton

Is anyone using 22 lb. injectors in a LB9 305? What brand?

I'm going to install SR Torquers, a Crane 2032 Cam 452/465 214/220 112 deg., and do some gasket matching so I'll have more air flow.

I'll need to use the stock ECM for awhile until I can learn to burn my own PROM.

I need to pass California smog too.....

406TPI

iTrader: (1)

Stick with 19's for now....especially if you can't burn a new chip right now.

Drkhrse89

iTrader: (1)

I completely agree with the above statement. I have some 22# injectors in my car now but had to do a lot of computer tuning to get it to run right. The only reason I ran them was because I bought them for cheap and I am building a 383 to put them in.

mnorton

Thanks for you input!

jonarotz

iTrader: (26)

I am running Accel 21 lber's, Definatly need to change the chip. It would run super rich otherwise.

PHAT89TA

you could get ford 19# injectors. I have them on my stock 89 TA and I have no problems with them. I heard the ford 19lb are equivilant to gm 22lbs.

jonarotz

iTrader: (26)

It all depends on the rated pressure.

3.8TransAM

Ford 19# inj are the same/ equal to gm 19# injectors :-)

(I will state that various injectors do have increased/decreased response time and their actions in a transient state do differ)

This was beat down and put to rest a long time ago.

We prom tuners can also back it by using the inj constant sizing feature and 99% of the time when using ford injectors it is equal to or very close to the rated pressure.

I run 24 and 30# SVO injectors and know firsthand what i state is true.

The injectors flow what they are rated at at 43.5 psi by thier manufacturer.....

U can "fudge" a 1 psi difference in inj. size. However if you start putting a svo24(or other 24# inj) where a GM 22# was, you will be pushing your computer to the borderlines of correction and driveability issues will begin to appear. This can be remedied by changing the Injector Constant via prom tuning/burning

Do a thourough search with an open mind and u will find proof and testing of this..

Just trying to keep an urban legend from spreading.

later
Jeremy

jonarotz

iTrader: (26)

I make my own chips so I don't worry to much, your right the inj const. will allow you some room to play.

91TG

3.8TransAM
"U can "fudge" a 1 psi difference in inj. size. However if you start putting a svo24(or other 24# inj) where a GM 22# was, you will be pushing your computer to the borderlines of correction and driveability issues will begin to appear. This can be remedied by changing the Injector Constant via prom tuning/burning"


Was looking to install Ford SVO 24# injectors in my stock L98 91 Z28. It has 88M on it and I think they need attention anyway. The only mods yet is a edelbrock cat back system (no cats) but there may be more mods someday. What all has to be changed in the prom and what would the new settings be.
Is there any advantage to larger Ford injectors in a stock 91 L98 TPI engine, what should the fuel pressure be set at for these injectors?
Or should I just keep the stock injectors and clean u up and call it good?
One more thing...I have read on here that increasing the fuel pressure with the stock injectors will increase HP and TQ. What would the max pressure be for stock injectors and would this effect the prom settings?

TIA
Todd
Sorry if I ran on a bit.

3.8TransAM

U want to run a svo 24# inj. right in your engine?

U need to set the Injector constant to 24 in the chip :-)

Play with FP all u want, it will help(possibly) but it wont get it right.

I've done this and experimented with it on my own car and can personally say I have seen it.

The 24# will drive your ecm to almost the point of not being able to correct any longer. It will still run, just not optimamlly and your mileage will suffer.

later
Jeremy

chazman

iTrader: (4)

Sorry to bring up this old thread, Jeremy. We've established that 24# injectors in a stock LB9 is far from optimal. My question is, in your opinion, how long can you run them without changing the PROM constant, before doing harm to the engine, ie., cylinder wall washing, ring damage or cat failure, etc.?