When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Has anyone ever seen these before? Or tried them out?
These are 12 hole 24# fuel injectors and should fit perfect in my S4. They have the slot for the retaining clip. After looking at the specs they look like they should work.
Let me know what you think.
I may need a remapped chip for them, but it might be worth it. Or maybe not, It might just run really rich at WOT. After reading a bunch about the 24# regular injectors it looks like the LH 2.2 computer has about a 20% adjustment range built in to it.
12 holes will really atomize the fuel better than a 1 hole and the 4 hole.
That doesn't look like a Junior Power connector on the injector; am I missing something? Not that it's a difficult change but I'm not sure that it wouldn't require a little extra work.
Where did you get the injector? I'd love to read more about it.
They came with the adapters for the electrical connection. I got them from osidetiger.com. They are a rebuild service in California. Really seen to know what they are doing. I have purchased from them before, and they were great.
Those will work fine. The 86 and back all had 24lb fuel injectors from the factory. It's the S4 and up that had the 19lb injectors.
I personally put a set of 6 hole on my dad's 944 and they really helped smooth the idle and decrease emissions out the tail pipe. They should do the same for you!
Hands down one of the best easy upgrades you can do to an old P car.
Those will work fine. The 86 and back all had 24lb fuel injectors from the factory. It's the S4 and up that had the 19lb injectors.
I personally put a set of 6 hole on my dad's 944 and they really helped smooth the idle and decrease emissions out the tail pipe. They should do the same for you!
Hands down one of the best easy upgrades you can do to an old P car.
Would these also work in an 84 Euro S hi-comp motor? Not sure what's currently in there as I didn't install them.
I installed them last night and the car started up and ran perfect. After taking it for a drive, it drove perfect.
Now as a side note... I am very cynical, and I don't believe any of the snake oil sale pitches ever, without full investigation. BUT, I swear the midrange on the car improve noticeably. Better pulls from 3000 rpm and up and the idle is smoother. Not by a whole bunch but just barely enough to notice. So I am going to leave then in. They are just a bit noisier than the metal injectors. The 928 turns them all on and off at once so you get just a bit more clicking with the hood open. I also had to tie wrap up the connectors to the wiring harness and fuel rail, they are about 2" long and I wanted to secure the wires so they weren't flopping around and rubbing.
Would these also work in an 84 Euro S hi-comp motor? Not sure what's currently in there as I didn't install them.
They will, but you need to get a set of adapters from Greg B to make this style fit as the fuel rail in a Euro doesn't clamp down on them like in the S3 and up.
After about 500 miles on the car, it runs excellent with these injectors. I really does seem to have better midrange. and starts right up when cold and hot. I think it might be a little rich at idle when cold, but that doesn't bother me at all. They fit perfect in the fuel rail and in the retaining clips. I would not switch back to the 4 hole injectors now after running them for this many miles. We'll see how they hold up over the long term and I will report back.
After about 500 miles on the car, it runs excellent with these injectors. I really does seem to have better midrange. and starts right up when cold and hot. I think it might be a little rich at idle when cold, but that doesn't bother me at all. They fit perfect in the fuel rail and in the retaining clips. I would not switch back to the 4 hole injectors now after running them for this many miles. We'll see how they hold up over the long term and I will report back.
Scott,
When talking about improvements in fuel injectors the starting point has to be with injectors that are fully cleaned and functioning as designed. My experience with Bosch injectors over here is that compared to other injectors they seem to get clogged up [comparatively speaking] far quicker than other injectors used on my Japnese and Korean vehicles that i have owned over the years thus if you are comparing cleaned injectors fair enough given new ones will be in such condition. I felt there was a small improvement to be had in the way the engine picks up comparing stock [cleaned] injectors to the 4 hole injectors that I currently use. The thing that concerned me at the time was that the injectors are part of a system and that system includes a filter. The filter has to take out particle sizes that could clog the injectors. For the stock injectors I could not find any data to support the orifice size of the stock pintle type injector and to date I have had no issue over the last 10 years or so using the 4 hole design 2 injectors but with the injector you are using did you make any checks to ensure that the stock filter is adequate given the diameter of the holes is going to be considerably smaller than my 4 hole injectors.
I would also note that if you are going to run 24# injectors instead of 19lb injectors you will consume 25% more fuel across the board without a remap. I can understand why it is not a problem mid range as the mid range tune generally needs a bit of enrichment anyway but these motors run pig rich on top end and adding even more fuel is probably going to cost you some top end power albeit not a great deal unless and until AFR drops below about 10 and then power delivery falls off a cliff. The stock S4 tune typically produces an AFR of about 12.4 so with 25% enrichment that theoretically drops AFR to about 9.5 on full load runs thus marginal I suspect. Thus I can understand why you perceive the situation to be "better" but in reality you need either a custom chip programme [as I use in ST2] or you could drop the pressure in the fuel rail were you to fit an adjustable FPR.
There is also another potential problem with excessive fuelling and that is if the unburnt fuel starts to contaminate the oil but I do not know at what AFR that starts to be a problem. If you are happy with how you are running then fair enough but just be advised of the above concerns assuming you are not already aware of such. I run with 30lb injectors but then compensating for such with ST2 is a simple single click of the mouse when programming the PEM within my LH unit.
I did have newly rebuilt 4 hole injectors in the car and had about 2000 miles on them when I switched . From what I read here on this forum, The "computer" has some leeway of about 10% to adjust the amount of fuel based on what the oxygen sensor is telling the system. (when the car is warmed up). Cold starts and WOT it uses it's table to fuel the engine. WOT is fine and like I said the cold starts seem a little rich, I'm not an expert and they just "seem" a little rich to me.
Hey Scott thanks for updating this thread. I followed when you originally posted and these are intriguing for me..I have design II 4 hole and would like a set with more holes but was wondering some about the size of the holes being smaller. I always notice a positive change when I run Techron through it. Interesting that they are louder. Did you notice any reduction in latency...from when you depress pedal to when there is a change...when I put these Design II's in I noticed a reduction in latency so was curious if you encountered it with these.
I wouldn't worry about it running a little rich when cold...if mine isn't getting enough when cold it essentially won't even run...it smells like a gas station LOL
Do you notice any gasoline odor when its fully warmed up and you're at a traffic light, etc with windows down...
When talking about improvements in fuel injectors the starting point has to be with injectors that are fully cleaned and functioning as designed. My experience with Bosch injectors over here is that compared to other injectors they seem to get clogged up [comparatively speaking] far quicker than other injectors used on my Japnese and Korean vehicles that i have owned over the years thus if you are comparing cleaned injectors fair enough given new ones will be in such condition. I felt there was a small improvement to be had in the way the engine picks up comparing stock [cleaned] injectors to the 4 hole injectors that I currently use. The thing that concerned me at the time was that the injectors are part of a system and that system includes a filter. The filter has to take out particle sizes that could clog the injectors. For the stock injectors I could not find any data to support the orifice size of the stock pintle type injector and to date I have had no issue over the last 10 years or so using the 4 hole design 2 injectors but with the injector you are using did you make any checks to ensure that the stock filter is adequate given the diameter of the holes is going to be considerably smaller than my 4 hole injectors.
I would also note that if you are going to run 24# injectors instead of 19lb injectors you will consume 25% more fuel across the board without a remap. I can understand why it is not a problem mid range as the mid range tune generally needs a bit of enrichment anyway but these motors run pig rich on top end and adding even more fuel is probably going to cost you some top end power albeit not a great deal unless and until AFR drops below about 10 and then power delivery falls off a cliff. The stock S4 tune typically produces an AFR of about 12.4 so with 25% enrichment that theoretically drops AFR to about 9.5 on full load runs thus marginal I suspect. Thus I can understand why you perceive the situation to be "better" but in reality you need either a custom chip programme [as I use in ST2] or you could drop the pressure in the fuel rail were you to fit an adjustable FPR.
There is also another potential problem with excessive fuelling and that is if the unburnt fuel starts to contaminate the oil but I do not know at what AFR that starts to be a problem. If you are happy with how you are running then fair enough but just be advised of the above concerns assuming you are not already aware of such. I run with 30lb injectors but then compensating for such with ST2 is a simple single click of the mouse when programming the PEM within my LH unit.
Well, even after he maxes out the LT/ST correction he's still 5-8% rich _everywhere_.
I'll pull the plugs in a couple of weeks and put some pictures up of them and we should be able to see how it's running. It might need a sharktuner.
Pulling plugs is only useful on a WOT pull, and shutting down immediately...although good for chronic engine conditions..
If you have a cat, kiss it goodbye over a short period of time, it'll always be rich, and always entirely out of the range of the ECU to correct it.
Also affect oil quality by fueling it up, and evaporating VOCs from it cyclicly.
Best case, $200 for PEMs to put in your ECUs, and have someone with a ST come tell the ECU what size injectors you have...not worth buying one for $1000 just to do this one thing.
I think the 89 uses the 'round' ECU connection (can someone verify this)..I might even come out with my ST if you dont have one local...but I dont have the round cable.
24s in an S4+ without correction "works"..but so does machine oil in place of motor oil..lots of things...work.
05-24-2022, 03:20 PM
12-hole fuel injectors 24#
