i'll be putting a new engine in my trans am soon and i was going to put new injectors in too, and i was wondering what brand injectors u guys prefer....thanks

 

Go with the Ford Motorsport injectors. They're cheap and work as well as the Bosch. I've been using the 30# inj in my stroker for the last 2 years without any problems. The best part is that they only cost me $200 for the set.

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D&Z Performance
"Putting Power to the Pavement"

 

I would say the general concensus is the Ford SVO injectors as mentioned above are considered the best bang for the buck. I too am looking at injectors and these are what I will be going to.

The only problem is the Ford injectors are rated at a lower PSI (37) vs GM (43.5). Thus a SVO 24# injector is equivalent to a 26# using GM's method of rating them. And a 30# Ford would be like a GM 33#.

The only fly in the ointment is that to use the Ford injectors (24#) in my case, they will run too rich on my car due to their larger size. You choice in compensating is either to reduce your fuel pressure to about 31-32 psi to make it act like a GM 22# (not a good option) or adjust the PROM.

I went for "burning my own PROM" as the price difference between the GM and Ford injectors more than compensate for the cost of the software, burnner and eraser. I can tell you, that adjusting for a larger injector on the 730 ecm (SD cars) is a very simple process. What's best, is I now can modify other things in my ecm to get my engine tuned even better.

 

My buddy and I had a lengthy conversation about 24# SVO injectors. His opinion is that no matter how you adjust or compensate for the larger injectors, you're still running injectors that are too large for your setup. The adjustments you would make will only run the injectors at lesser duty cycles, lower pressure and other bla..bla..bla... It made sense to me but now I forgot exactly what terms he was using. Bottom line is that he thought the 24# SVOs would be way too much fuel.

I'm at the same cross-roads now. I'm building my new 350 TPI engine and I'm at the fuel injector stage. I just can't see spending close to $500 for GM type injectors when SVOs are out there for less than $250! But at the same time, if the SVOs are not the correct match, then what's the point?

Will someone please clarify on this subject?

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'92 RS, ZZ4 10:1 350, Edelbrock 6085 heads, Crane 208/214 467/482 cam, GM/LT4 1.6 true roller rockers, Holley Projection TBI intake, Holley 670 TBI, SLP/Jet-Hot 1-5/8" headers, Catco 3" cat, Flowmaster 3" catback, Hughes 2500 stall converter, stock 700R4, Auburn Pro posi w/3.42, 17x9" SS rims w/BFG tires, Medium Quasar Blue w/white SS stripes, 48,000 miles....soon to be an Accel-DFI Speed Density TPI!!

 

I personally like the Ford SVO's. I have the 36# in my car and they work great

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1991 Formula w/ K&N filter running 11's. MAN THAT IS SOME FILTER!

 

I have the MSD's and like them.

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89 FORMULA 350 Edelbrock Cat-Back ,March Pulleys,Super Coil,MSD 6AL ,Edelbrock TES's, AFPR ,Shiftkit, Edelbrock Base ,AS&M Runners, Edelbrock Waterpump, Fast chip,Crane Gold 1.6 RR's, BBK 52mm TB , MSD 22# Injectors ,9.5 Vigilante. Hoping for 13.5

 

Scott, if you burn your own PROM, you can pretty well compensate for any combination of cubic inches, pressure and flow rate within a reasonable range. Obviously, if you had a 383, you'd probably max out the duty cyle of 19# injectors. Conversely, 30#s on a stock 305 could result in an injector with too short of a pulse width for idleing. But for a 350 (except possibly an extreme N/A engine or force-fed), 24#s are well within range to compensate in the PROM for an SD car. And shouldn't be a problem for a MAF TPI car either.

I'll save my money and get the Ford SVO injectors. Its easy for your friend to say that, it isn't his money. Get the prices for the GM and the Ford injectors, and you'll see what I mean when I say that I can get the SVOs, the PROM burning equipment and still be dollars ahead.

Scope out the PROM board and download one of the Editors. It's a lot easier to burn your own PROM than you think.

 

This was a concern of mine too, so I got LT1 24# injectors instead used for $40. Then I will send them to get cleaned and flow matched for another $80. So for a little over $120 you can have 24# injectors that will run at the correct pressure and not worry about running too rich. IMO, if you aren't comfortable tweaking your own PROM to correct the fuel map for SVO 24# injectors, then this is the better alternative.



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1989 IROC-Z, ZZ3 shortblock with some bolt-ons.
13.20 @ 108.69, 2.2 60'

 

You guys know that Accel make some new injectors now? There 24# cost like $230 from Summit and have a few more features than the SVO's. Looks like a better injector to me.

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Convertible, L98, Mini-ram, ZZ9 cam, Comp Cams 1.52/1.6 steel roller rockers, Trick Flow 23* heads, K&N's with chopped airboxes, March underdive pulleys, Edelbrock ceramic coated TES, Flowmaster cat-back exhaust, Dynomax high flow converter, MAC subframe connectors, Accel box & coil, 3.23 rear gears, white face gagues, and NOS!
When I get back from Kosovo I will be installing these on-order items!

 

I am almost positive that the Accel injectors are made by Bosch. The ford SVO injectors are made by Bosch. Therefore, they are the exact same injector.

 

This is great info! I'm really leaning towards the 24# SVOs, especially with the ability to tune for them with a prom or even better, Accel-DFI.

I'm going to do a search for those new Accel injectors, but I remember someone saying that the $230 price from Summit was a mistake. I'll let you guys know.

Here is an important question:
What brands of injectors should we stay away from? There are so many vendors offering injectors, who really knows their stuff?

 

Good discussion! Whats the part # for the
Ford 24# SVO injectors?
Thanks

 

I don't know the part#. What I did was look through a Mustang magazine and called a few places. I was able to get a set of 30# for $200. All you need to do is ask for the 24# injectors. The easy way to tell injector size is by color. The 24# might be Blue?

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D&Z Performance
"Putting Power to the Pavement"

 

Just got Summit's 2001 catalog and the new Accel injectors are on page 278. The 19lb/hr injectors part# ACC-150819 cost $230 : 24lb/hr part# ACC-150824 cost $230 : 30lb/hr part# ACC-150830 cost $250.
It even says they have a Bosch style spray pattern.

 

Anyone know whether or not you would need to recalibrate the prom with the 24# Accel injectors?

 

If you change to larger(or smaller for that matter) injectors you should recalibrate the PROM, as the the ECM bases it's duty cycle calculations and corrections on the flow rate of the stock injectors.

[This message has been edited by 88IROCs (edited January 24, 2001).]

 

The boshe injectors have a different pintle design than the SVO's

 

Frankly, you should recalibrate if you adjust your fuel pressure, let alone install larger injectors. I am running 48 psi and I had to adjust my Fuel Injector Constant to 25.0#s (with my other mods).

I also had to adjust all my VE tables, but the end result is a great idling engine, much better performance and better gas mileage to boot.

I am finding the stock GM eprom is far to rich even with the stock fuel pressure setting (42 psi ... had to try it just to see the effects), and if you bump up the fuel pressure it causes even more BIZZARE effects. At lower load (MAP readings) additional fuel pressure has minimal effect, believe it or not...but at higher MAP readings...it REALLY causes you to go rich.

When you bump up fuel pressure, you measure it with the vacuum line off...which is the same as a high load/high MAP/low vacuum reading...but at idle (low load/low MAP/high vacuum) it had minimal effect. You can see this with a fuel pressure guage connected.

This is different than larger injectors which causes extra fuel in all load ranges...but fuel pressure affects the higher MAP area far greater than low MAP areas.

This is the same for SD and MAF systems. It just becomes even more important on an SD system as you MUST adjust the VE tables.

 

Hey....there is a group purchase for the Accel injectors going on right now for those of you that are interested in buying new injectors. Check out the post on the TPI board for more info.

BTW, Accel's injectors are made by an independant company.