I just replaced the Multec injectors in the 91 Formula, gotta say they are great. Fit right in the rails/manifold (they don't reuse the clips) Car fired right up and ran perfectly. For $99 they simply can't be beaten.t

 

can u guve us a long term report on them, like 2 months at least?

did the fuel pressure need to be touched at all?

 

Sure can. I didn't touch the FP, I burned a new chip with a 25# injector constant.

 

A week and a half. They are still running well and fuel economy is up.

 

that's good too hear. i myself am wondering if they are any better than the LT1 style injectors? i've had a set of 24# LT1's on my car for a while now and just want an excuse to get NEW injectors. LOL. more than likely i will get a set just have a spare set.

 

I doubt they are any "better" than the LT1's, just flow more and rated at a higher pressure. One thing I did notice, they are very slim (less than half the diameter of the multech's and slimmer than Accel's). Which would translate to a smaller, lighter pintle which would mean they should flow more consistant and be easier on the windings that operate them

 

Where'd you get the injectors from? They sound awfully appetizing for $99...

 

I just wanted you guys to know that the LS1 Camaros and Firebirds came with either 26.5#/hr or 28.5#/hr injectors depending on model year. LS1 injectors are rated at 58psi.

When applying the fuel pressure equation, you will find that the L98 22#/hr injectors flow 26.5#/hr at 58psi and that the LT1 24#/hr injectors will flow 28.5#/hr at 58psi.

 

slp of course

http://www.slponline.com/view_produc...RTNUMBER=23051

 

Well if these are actually flowing 25# @ 3 bar (43.5 PSI) then @ 58 PSI they are 28.86#.

as mentioned 28.5# @ 58PSI will = 24.68# @ 43.5PSI.

maybe they are stock LS1 injectors, but just rounding them up?

 

Yes, they are just rounding the numbers. If you were to look at your injector constant on a stock prom you'd see the 350's are actually 21.6X lbs/hr. The mfg (Bosch) rounds them too, its easier to say they are 28/29# vs 27.673#...easier for everyone.

 

Morley if you are using a 25lb injector constant what rail pressure are you running?

 

44 psi. Still running great too.

 

I bought them as well for my 383. I'll let ya know how they work out in a few months.

 

Thanks, I got mine in and used 25 injector constant. It fired right up.

 

i wonder how much richer it would run if i were to install 'em on my L98...

 

2 much. I wouldn't advise it without burning a chip with the correct injector size.

 

i popped the slp injectors (stock ls1 injectors) on a otherwise stock 92 L98. it wasn't pretty. it would not rev up freely. once the correct injector constant was programmed... much better.

i even ordered a extra set to have on hand.

they are shorter and did require grinding down on the fuel rail mounting for proper "sealing".

 

On mine I have the edelbrock base and with stock injectors I had to add a spacer for proper clearance so the LS1 injectors fit just perfect without the spacer.

 

hey, just looking to get the lowdown on the injectors..
I got my set the other day, and will be installing on my 1989 tpi setup. I don't have a chip, and my buddy who does burn them is in IRAQ NOW.................. and i am in JAPAN, So no chip for me.
How bad will it run on a stock LB9 prom?
I will be getting a parts L98 car soon, will the L98 chip at elast run, long enough to time it and set valve lash?
thanks shawn

 

LB9's used 19lb injectors, LS1's are 25lb @43 psi, you are going to have major problems. It would do better in a 350 with the stock 350 prom, but it will still be over fueling quite a bit.

 

i'd like to open this thread back up to ANYONE that has experience with these injectors, i've found out that on a stock TPI setup, they make the car run lean. I am having this PROBLEM, my plugs are white, and i'm not sure what to do, if anyone knows, please let me know, do i just have to get an adjustable FPR?? or do i just have to make a change in the chip???

 

With my 383 TF Heads 219 cam and LTR's I have my constant set at 30 with these injectors. My AF ratio is 13.1 through 12.2 from 3500-6800 RPM on the dyno. Perfect looking plugs for me.

 

awsome, maybe i just have a little tuning to do after all. anyone else?

 

hey, this is the OKINAWA guy. I have had the injectors in now for almost a year. The stock chip seems to run well. I have a 30,000 mile STOCK TPI with stock fuel pressure. I have an AUTO X RAY, but I am not really clued on how to read it. I have been reading about "slight engine misses" being injector related, and I have a real small vibe. good luck, and thanks for resurrecting the thread.
shawn

 

The injectors work very well and I was running high 12's with them. You need to change your prom for it to work right since they are larger than your stock injectors.

 

yes i know, but im not sure what to change, the injector constant on the chip i have in there now is 22 i think, im not sure if thats ok, or if i should change it. also out of nowhere today, i got a code 36....... ugh i dunno why yet

 

Fix your error code first. You could have a bad O2 sensor giving the ECM false readings. Also, I'd check your fuel pressure and watch you BLMs. With a stock chip the LS1 28/lb injectors would run rich. I had to set my constant at 25.

 

By the way here is the description for a code 36

36. Burn off at mass air flow sensor OR
Problem in transmission shift OR
Fault in direct ignition system OR
Missing pulses in electronic spark timing signal

 

well, the code decided to go away after i reset the computer...... go figure. i think my fuel pressure for some reason is lower than it should be, its like in the 30's according to my guage for the last couple months or so, but the guage used to read in the 40's.... i need to hook another guage up to it and see what it says, if it also says in the 30's i think my pump or something is going bad. ugh. anyway, ill keep you updated thanks for all the help!

 

It should be at least 43 lbs. That is why you are running lean. Put an adjust FP regulator on it while you are at it.

 

sounds good, ill get back to ya after i check the pressure w/ another guage just to make sure my guage didnt break or is giving me false readings

 

well, i checked out the guage and it was correct, the guage is fine. im gonna change the fuel filter and see if that makes a difference.

 

oh man, i know this thread is old but, just wanted to say i ended up changing the fuel pump, and that was my fuel pressure problem after all. the car now is running fine, but my plugs still seem to be pretty white.... the injector constant that i have burnt on my chip right now is at 25#..... im going to try a 24# soon and see how that goes. anyway, ill keep you guys updated.

 

Are they avaliable through there web site or did you have to call them? I cant find them on the web site.

 

I just contacted SLP and they no longer have any LS1 injectors. They are all sold out and it sounded like they were not getting anymore.

 

welcome to efi. Many decent tuned efi set-ups don't color the plugs much, if any. As long as they don't show any signs of detonation, and you don't have any overheat issues or glowing manifolds/headers, don't get to worried about it.

 

oh ok, thanks a lot for that reassurance.

oh and yes, i know that SLP doesnt sell the injectors anymore, they havent for quite some time now...... when i asked about it, they told me that the injectors cause stock TPI engines to run lean......... something about the BAR on them......

 

i now have 100,000 miles on them since i installed them. they still work perfectly fine still. one plug does show lean though, so that injector must die. all in all they were a good deal.

 

same here, i've put atleast 20k on them, so far so good....

 

3 Years and 10K miles. No probs , but my constant is at 28lbs in order to have a good tune.

 

wow really. what intake are you running again?? is this still on a 383?

 

Yup This is on my 383. Its 10:5:1 TF Heads, LPE 219 cam and Miniram. With same combo last year - the mini and add in a Edel TPI base and ASM runners it was 12.76@106 with 323RWHp and 424 RWT on a Dynojet. The TPI hurt my HP and trap speed, thats why I went with the mini.

 

i'm pretty set on the super ram, ill be using this lunati voodoo cam with it:

hydraulic flat tappet
.050 duration: 227in 233ex
Valve Lift: .489in .504ex
lobe seperation: 110in 110ex
1,800-6,200 RPM

not sure what heads to go with yet, still kind of deciding