i was wondering if anyone had any recomendations on what brand of injectors to use. I have an 87 formula 355 tpi with 24# accel injectors in it and one of them is seizing up and this is after about 8,000 miles on brand new injectors theses are hunk of junk i want something better.

 

LS1 injectors - I got a set off of the SLP site for about $100 a month ago. They work great and they are rated at 25lb.

Great bang for the buck if you are in the market for injectors

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

 

I'll second that, the ones on the SLP site work great, and you can't beat the price... Almost worth buying two sets!!

 

LS1 cars came with two different flow rates just like the L98 vs LT1 injector. LS1s came with 26.5#/hr or 28.5#/hr injectors depending on the year. This flow rate is rated at 58psi.

At 43.5psi fuel pressure, these injector flow about 22#/hr and 24#/hr, respectively. I would buy the LS1 26.5#/hr injectors and install a adjustable fuel pressure regulator and dial in what works best for you at WOT. The part throotle running will take care of itself.

 

will the connectors in our harnesses work without any modification with the LS1 Injectors? Which set of LS1 injectors did you get from SLP?

 

I thought the Ford SVO injecters were the hot tip?

 

they are still if u want brand new injectors for next to nothing compared to what the dealer or parts stores charge u for replacements

$220 a set with tax for 19# to 30#
LAter
Jeremy

 

Where can you buy the Ford SVO Injectors at? I have been trying to find a place that sells them and I can't seem to find one.

 

Mike--1bad91Z I know can answer this one!

Craig

 

Ford SVO injectors are good injectors and very reasonably priced. They are WAY better than the Accel and SLP injectors as far as spray pattern, reliability, and longevity.

Just keep in mind that if you use SVO injectors, you need to have an ajustable fuel pressure regulator or be prepared to do some PROM tuning (change injector constant in PROM). The reason for this is that the SVO injectors are rated at #'s of fuel @ 39.5 PSI compared to the stock GM fuel pressure regulator's standard 43.5 PSI.

I bought my 24 lb. SVO's from Summit racing (1-800-230-3030).

 

Do you happen to know the summit part number? How much did they run from summit?

 

I am also going to be using SVOs. I have 30# I bought with 1000 miles on them from someone on another site. I am also using a new chip to make up for it. These should work well with the heads, cam and intake I have to put on.

 

I dont remember the part number, but I think they were like 215.00 bucks.

Just call Summit and tell them you need ?# SVO injectors (set of 8).

I run the 24 # SVO's on my motor.

 

I've run three sets of SVOs over the years and have nothing but good things to say about them. I've used 19s, 24s, and 30s all with good results in different cars. Go to the Summit website and order them.

 

I am running the 24#/hr SVO (now called Ford Racing) fuel injectors in my '87. You can get the Ford Racing injectors at Summit Racing or at Jegs.

In order to fine tune the flow rate for your specific engine, I would recommend that you also get an AFPR and a fuel pressure gauge.

 

To be totally correct it's now called FRPP (Ford Racing Performance Parts). Originally the SVO injectors were sold through the FMS (Ford Motorsports) subdivision. SVO used to stand for Special Vehicle Operations, but was replaced by SVT (Special Vehicle Team) sometime during the early 90s. Eventually SVT will be phased out too, which can only mean bad things for Ford, because the benefit of SVT and SVO was that they were run by performance orriented people that didn't only care about selling cars. They put out some of the fastest, best handling cars and trucks ever devised, but in recent years have been forced to stick their name on a Contour and a Focus, which should have been a sign that the end is near.

Well there's your Ford trivia for the day! Sorry to hijack the thread.

On a relevant note the injectors are still referred to as SVOs by a lot of Mustang parts companies, so don't be suprised if you still stumble across that lingo. Summit has the best price for the injectors all the time, but if you search carefully you can find Mustang places selling them on special for like $20-$25 less than Summit.

 

I have a set of ford #24 injectors for sale, I used them for 30 miles, then decided to switch to carb, I want like 150 or best offer for em, so if anyone needs em let me know.

 

when swapping to the ford injectors, will i use the same connectors that are on my current injectors or will i have to use different connectors?

 

yes the harness will match directly to the ford injectors with no mods, buy my injectors and put em on and you'll see.

 

This is internet rumor. We've proven that both the SVO 30, and 36 are rated at 43.5 psi. If someone has a flow sheet of a 24# being different than the other injectors Ford sells, we'd love to see it.

My "Guess" would be that the LS1 injector rating is a load of crap too. Everyone posts what they think injectors are rated at. I wanna see flow sheets.

https://www.thirdgen.org/techbb2/sho...hreadid=219294
-- Joe

 

I'm fairly certain that all Bosch style injectors are flow rated at 43.5 PSI. It's like an industry standard.

The AFPR is still a good idea though, and you will need a custom PROM. Camaros only came calibrated for either 22s or 19s depending on which engine it originally had. Even with the 22 calibration you will still be rich, especially at stock fuel pressure, which can be as low as 39 depending on the year. These systems aren't that good at trimminjg mixture using the O2 sensor, so don't let anyone tell you that either because it's a load of BS. I found that out the hard way.

 

The LS1 injectors are rated at 58 psi, because that is what the LS1's use for fuel pressure AND they are Bosch injectors. The "SLP" injectors are Bosch..brand new Bosch for the LS1's.

As you can see here http://www.autospeed.com/cms/A_0102/...popularArticle the flows for injectors are given at different pressures, not all the same.

Also, Accel injectors are just fine, some people have had problems with them, but the problems are all you hear about, people usually don't post " Hey, my_______ are working great, never have problems." Only when something goes wrong will someone speak out.

Oh, and my Accel injectors are working great, had em for over 4 years now and never had a problem.

 

I bought my 24# SVO's off eBay from a guy that came recommended to me from a member of another board. They were brand new and got them for $150.

Good deal if you ask me...

 

SVO

 

Just because an engine runs a specific fuel pressure doesn't mean that the injectors are rated at that pressure! They may be referenced as a certain size (e.g. 25 lbs/hr) based on the fuel pressure for a certain engine (e.g. 58 PSI), but when the injectors are designed they are rated at a constant pressure, which is always 43.5 PSI for a Bosch injector.

If you run enough fuel pressure through an injector you can make it act bigger than it is, until you get to the point where it goes static (open all the time, or 100% duty cycle). That's why injectors of a certain size (19 lbs/hr, ect) are often referenced by the maximum horsepower that they can support. Those 19 lbs/hr injectors flow 19 lbs/hr of fuel at 43.5 psi. You can increase fuel pressure to get more flow out of them, but by the time you reach 350 horsepower the injectors are right on the edge of going static, so the injectors simply can't support any more horsepower.

Also, production Bosch injectors can only withstand about 85 psi of fuel pressure, after which they basically lose the ability to control fuel flow. Running injectors on the edge in terms of pressure and duty cylce will quickly overheat the injectors and cause them to fail.

Just a few fun facts that haev very little to do with what we're discussing...

 

okay, so obviously you guys like the SVO....erm....Ford Racing.....injectors. My question is that if I run a '86 TPI on a new crate engine 350 making somewhere around 300-350hp, would the 24lb/hr be good enough? I am really desperate for good fuel mileage, but I assume that this would still make good mileage. Would these be the correct ones to use? Also, Summit put a little warning on these injectors that they "Must be used with recalibrated Hi-Flo Mass Air Sensors only". Does this apply to us at all?

 

24 lbs/hr injectors are perfect for this motor. 19s may even be good, but 24s would be a better choice. 24s will give you room to grow if you want in the future. Anything bigger and the idle will become a bit problematic because large injectors don't have good low pulsewidth flow capabilities.

The MAF warnings only apply to Fords. Fords EECIV system has an MAF that is calibrated to a given injector size. All they have to do is swap the injectors and the MAF sensor (or just the sample tube on some aftermarket MAFs). They have it very easy. The EECIV system is vastly superior to the GM EFI we have.

You will need a custom burned PROM to properly fuel the engine. An AFPR is also a good idea, espcially if you have to run a PROM that isn't made specifically for your car after dyno tuning sessions.

Gas mileage is really related to engine size, RPM, gearing, and throttle angle. Properly calibrated the injector size has nothing to do with it.

 

very cool. thanks for that:hail:

also, check out my thread a little farther down ( I need your help!!!!(putting TPI on crate motor) ). I talk a lot about the PROM I want to use, the AFPR, etc.

 

i have tried many different types of injectors and i will continue to use the svo injectors,if you can digest the price tag the syclone injectors work awesome too!!!!!!!!

 

When I called summit for some SVO 30 lb I had my choice of a matched set or not. The matched set came up to 380.00 Is it worth it for a matched set? What exactly do they do?

 

It means they all flow the same amount. Manufactures have a tolerance. I think 3% is ideal, but FORD might be something like 5%.

On a matched set they'll prolly all be 30.00 or 29.90 or somethin glike that. Unmatched might be like: 30.21, 29.21, 29.81, 28.99, and so on.

-- Joe

 

It's only worth it on a sequential system in my opinion. TPIs are bank to bank, so I wouldn't worry about it. Just go with the regular SVOs and you'll be fine.

 

Ermm.. No.

But what may work out is putting the slightly richer ones in the front cyls to compensate for the fact that they tend to get a bit more air than the back ones, unless your boosted, then put the richer ones in the back cyls.

-- Joe

 

Read the injector balance check procedure, All injectors should be within 10% of each other, otherwise it can cause poor idle, stumbling..etc.

 

Actually the problems with mixture distribution common to carb manifolds don't really seem to affect the TPI system. There will still be cylinders that are slightly rich or slightly lean, but nowhere near a carb manifold's levels of rich and lean. Typcially you can bring a cylinder right into line with hotter or colder plugs.

I still wouldn't waste the money on a matched set from SVO. I've never used them, and have never had problems with the regular SVO injectors in terms or rich and lean cylinders, even on sequential systems which are a lot more sensetive to cylinder to cylinder variation than bank to bank.

 

I called summit back on the price of non matched injectors 30lbs They were 220. I also asked the sales rep about the matched. he said they were matched within 1 percent. He has worked at summit for a year and never sold a set

 

Well, I had mine checked at cruzin performance and they were within 3%. Rich (the owner) says 3% is acceptable. Any more than that is NOT.

But what does he know, he just does this for a living..

-- Joe

 

3% or 3 PSI? 3% of an injector running at 43 PSI is 1.29psi, kinda tight tolerance there.

 

3%.. So if you did a 100ml test on them (calculate time to spray 100ml) most if not all should spray 100ml in that given time, and the absolute worst one shouldn't be less than 97ml.

This is the exact test he does. (static, multipulse timed, etc)


-- Joe

 

Ok, he is doing the volume test not the balance test, 3% would be reasonable for that.

 

So could I use the SLP 25lb LS1 injectors on my stock L98?? Since IM only running stock fuel pressure...they would flow between 22 and 24lb? right?? This would be most helpful......thanks in advance...

ALso, I just found some Ford 24# injectors from a 99 Cobra for $120.....good deal?? Would I need a new PROM for them??

 

your gonna need a new prom with whatever injectors unless you get stock injectors.

the slp injectors will work on your l98 without a problem. if your running stock fuel pressure, i'd advise you to bring it down a little. stock pressure with the slp injectors are 25 lbs... turning the fp down a few psi will bring it to around 22, 23... just dont run it too rich or you'll be kicking yourself if you gas wash your rings

 

Im just gonna get some Accel injectors...should I get the 21 or 23lbs? I didnt see a part # for 22lb. That way it will take out the guess work for right now.

 

hmm... i dunno what to tell you about accel. ive heard a lot of bad crap about their injectors, and then i only know a handfull of ppl that say they've never had problems with them. but if your stuck on getting accel, get the 23 #'s and drop stock fuel pressure about a lb or so.

what kind of mods have you done to your car?

 

The only mods are high flow cats, Ypipe and 3in Catback. I have some minor ignition upgrades...but thats pretty much it on this one. I just would like to find some injectors I can drop in without buying a bunch of stuff for a PROM to make it run right. Im trying to keep in running for about another 6mths till my 406 is done. Im using a Edelbrock EFI intake(RPM manifold) and their ECM, so I wont most of my existing TPI setup. COuld I use the SVO injectors?? They are rated at a lower psi right? I could get them and then get a AFPR to tune it. I could do that and then hook up my laptop to check AFR......OR should I just find some stock injectors..?? Man Im stumped...

 

here's my question to ya... whats wrong with your injectors now? lol

 

I found brand new Bosch TPI injectors on fiveomotorsport.com for $188....it says they arent the OEM part, but the flow and electrial characteristics match the originals. Whats wrong with MY injectors? Well, only 2 of the 8 are in spec. The car runs fine when cold...but after its warm...it runs bad. Ive checked/replaced EVERYthing you can think of....then when I checked the resistance of mine, I found the problem. The Cyl3 injector is 4.8ohms at operating temp. The Cyl4 on the opposite side is 10.5ohms. Im guessing they are sticking open and not spraying correcting...or just dumping fuel in. The rest that arent in spec are higher than the recommended 14ohms. They are closer to 15 or 16ohms. I thought about just replacing the two that are so low...but at $59 a piece for rebuilt ones....I might as well replace all of them..

here's a link to the injectors Im talking about

http://www.fiveomotorsport.com/Injector_SetsTPI.asp

 

go with the bosch tpi injectors then ... i dont think you'd have to get a new prom since they have the same specs as the stock injectors.