Another karma point for you. So many people with the RS4 alone have had issues that blamed the complete wrong stuff from tunes to exhaust.
Its sad that most people were never smart enough to even think there must be something else wrong. Again good for you this is something really important that has gone over looked
What is the consensus on which injectors to buy? OEM from dealer, or are the Hitachi ones that you see elsewhere OK? I saw somewhere that the spray pattern of those Hitachis is different from the OEM ones and that is possibly why Meem had troubles. Also, I have seen the OES injectors which are cheaper in price as well. In Canada the OEM injectors are running $270.00 per injector.
Opinions?
Great question. I think the OEM injectors are the best choice. You dont nessessarly need to get them from the dealer but you want to get oem replacements.
From there it might not be a bad idea to get the new injectors flow tested. I have seen a few cases where the V10 guys got new injectors only to need them replaced again. Testing the injectors before you install them would be a good idea or at the very least a good insurance plan
[quote=“justincredible,post:63,topic:7982”]
^^this.
So I ended up buying the Hitachi’s vs. OEM. Once they arrive, I’m having them tested at the same time as my originals so I know what I’m getting into. I’ll report back with results.
[quote=“koolade9,post:64,topic:7982”]
Thanks koolade, this will be good data to have. I gave highPSI on AZ the same advice when he busted a few of his injectors. He has two new hitachi injectors running with 6 OEM that were cleaned. Unfortunately he didn’t send the hitachis in for flow testing with the OEMs.
[quote=“koolade9,post:64,topic:7982”]
I would be very interested to hear the results. HighPSI-S4 is a friend of mine and I have helped him with a lot of things on his car including when he had his injector issues. I remember him saying that he got two new injectors.
[quote=“justincredible,post:63,topic:7982”]
I don’t want to downplay this statement. I often work with manufacturing firms and the amount of time/money that goes into quality control is the #1 reason you buy OEM parts. They cost more, but you get what you pay for. For those that know me, I run OEM parts whenever I can…I’m taking a calculated risk on the hitachis. Primarily because I bought 8 for $350 + $200 to test them vs. $1600. Were I just replacing 1 or 2, I probably would’ve gone with OEM. I just wanted to share my thought process on this purchase.
New injectors should arrive today. I should have more info by next week.
Looking forward to seeing how those stack up.
I am thinking one of the benefits when buying dealer supplied injectors is they will have warranty on them.
The shop I use said one of the RS4s he works on has had injector issues 4 times already and it only has 70,000km on it. Very strange.
[quote=“koolade9,post:67,topic:7982”]
FWIW, the Hitachi is the manufacturer of these injectors for Audi. Looking on ECS’s website and a few others, the numbers stamped on the “OEM’s” are the same as the Hitachi’s (other than a missing VW part number), VW/Audi just prints their name on them and resells them for another $100 markup (the ones being sold now as OEM look exactly the same as the Hitachi’s I bought, even down to the inlet port on top of the injector whereas my original OEM’s are slightly different looking). Similar situation with the throttle bodies where the GM equivalent is $400 but Audi charges $1100 for the exact same part.
My original OEM injector is the one with the brown o-ring, new Hitachi is blue.
http://i565.photobucket.com/albums/ss95/FWP09/oemhitachi2_zpsmrfw5u9i.png
[quote=“koolade9,post:67,topic:7982”]
I think its smart what your doing. OEM replacements as you mentioned have a very specific quality control range and when the aftermarket or even the company that originally makes the injectors offers there own brand without the Audi stamp the quality control and specs are going to be different.
That dosent have to mean different bad just there isnt a licence to keep the same tolerances that the original customer (audi) asked for. So in this case hitichi might have offered that same injector that the RS4 uses to other customers just under a different spec range and a different tollerance range. This is why you can have big swings from what most would assume is the same part when it is kinda the same part but not nessessarly the same spec range that the oem customer demanded.
So to branch off is a good idea. You just want to make sure you maybe test them before you install them. Interested to hear more
Will be interested to see how they test out as well.
Still have 8 Hitachis sitting in a drawer in my desk, I’ve not been inclined to fit them as the car is running without issues and performing strongly. If it’s not broken… I’m just leaving it alone for now. The ones I bought were flow matched, and the fuel smell when I opened the package suggests that they were. I might simply sell them on at some point as they’re worth more in Europe than I paid for them last year anyway.
On an NA engine I think it makes sense to get Hitachis as Audi likes to take the p*** with its OEM pricing and the risk is very low. For people with superchargers however, I wouldn’t screw around as you can easily destroy your engine with little advance warning.
Very very true
Upper sheet is for the 4 original injectors I had tested & cleaned (cylinders numbered). The bottom sheet is for the 8 new hitachi (non-oem) injectors I had tested for comparison & sanity check. I’m curious if the new ones are perhaps a revised version?
Thanks for doing that koolade, looks like there’s a small percentage of flow variation between the Hitachis and the OEs. I wonder if this difference has to do with the age of the OE injectors? Now I’m curious to see the difference between a new OE and new Hitachi.
Unfortunately all these shops use different metrics for testing so it’s difficult to compare between results. Did the shop have any comments about spray patterns and whether they were comparable between the new/old injectors?
Interesting thanks koolade. I have a set of 8 hitachi injectors sitting around from the PO that he never replaced. I’ve been contemplating sending my OEM out for cleaning and selling the Hitachi or just installing the hitachi.
So my take on the data is that we need more samples. Specifically a new OEM injector to test. There could very well be a new revision to the design…10 years without a revision seems pretty unlikely. Perhaps the trade-off is better low duty cycle control vs. ultimate flow capability, but I’m just speculating.
For anyone looking to purchase a new OEM injector, if you can send it to me for a few days, I’d be willing to have it tested and sent back on my dime so we have common results to compare.
Not that you should pay for it but this sounds like a good idea. we really do need more testing to figure out what we are getting. There is a difference here in the new and old flow rate. Enough that you would think the ECU would have to adjust
Pulled my injectors this weekend to send off for cleaning. I was looking at the new set I have from the PO though and found some interesting stuff. Looks like whoever he bought them from sent half OEM Audi and half hitachi. They tried to grind out the Audi symbols. My guess is they are probably identical. Right side is OEM. Also there appears to be a batch number of sorts 2202 on the Audi (my other 3 audi say 2509). All of the hitachi are 3924/4418. The eight OEM I pulled out say 5Y11 and I have two other spare OEM out of another block that say 6525 so the might not mean batch numbers.
http://uploads.tapatalk-cdn.com/20160321/1856385fe4234e70d805de4d56373901.jpg
http://uploads.tapatalk-cdn.com/20160321/abcbd9e7d96c42a8eb8f357367527b0e.jpg