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Old 02-03-2021, 11:12 PM   #1
yolk
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Default High mileage rex/regina injectors (blue, red, orange)

I'm looking to upgrade the original * yellow * top injectors (18lbs/hr, 14.5ohm) on our 1990 740 non-turbo rex/regina and id like to know what people think about upgrading to the orange tops (29.5 lbs/hr, 14.5ohm), or if the red tops were compatible at their slightly higher resistance (30 lbs/hr, 15.95ohm)?

edit;
i originally quoted the * yellow * tops @ 24lbs/hr but i am seeing that they're part #1389563 and rated at 18lbs/hr (vs 24lbs/hr like i originally thought) -- im taking all my information from injector planet (eg https://www.injectorplanet.com/produ...ffcc2cc8&_ss=r )

EDIT #2 [TL;DR]:

DONE!
i swapped the OEM regina injectors (P# 1389563) with 236k miles on them for injectors from a newer whiteblock volvo (P# 0280155746​) and it has made a noticeable improvement in start-up, idle, and power delivery. here is video proof:

https://youtu.be/faJqQgdfqho

Last edited by yolk; 02-26-2021 at 05:55 PM.. Reason: corrected wrong information
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Old 02-05-2021, 02:06 PM   #2
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Your question makes me answer with a question. Why? If you are just running stock a bigger injector isn't going to give you more power. If you are increasing the performance with higher compression and a cam for example. Then yes, add some more flow to the system. I'd also want to put a tune on that computer and I don't know of anyone tuning Rex/Regina. There were some +T threads using it, if I recall correctly. Cleaned refurbished stock injectors were about $50 for 4 on ebay.
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Old 02-06-2021, 12:17 AM   #3
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let me be more specific;

what would happen if i ran an injector rated @ 15.95 ohms in place of the stock injector rated at 14.50 ohms

Last edited by yolk; 02-06-2021 at 12:25 AM..
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Old 02-06-2021, 12:32 AM   #4
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fyi a member here sells more efficient, modern injectors at a better price than what you quoted from ebay and another member reported that after upgrading to orange tops (but before their +T) they returned significant mileage gains over stock blue tops.

anyone with experience RE: injector resistance or upgrading their regina to orange/red tops care to chime in?
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Old 02-06-2021, 03:55 PM   #5
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1.5 ohms difference isn't enough to matter. The injector will work fine. Good luck with your quest.
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Old 02-10-2021, 08:46 PM   #6
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thanks for that--i was hoping it was only a negligible difference
ill update after replacing the worn out stock injectors and putting a few tanks of gas through it, fwiw
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Old 02-10-2021, 08:51 PM   #7
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Please do a update. I have a regina 740 and have thought of changing injectors as well
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Old 02-10-2021, 09:18 PM   #8
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Quote:
Originally Posted by oldnfast View Post
Please do a update. I have a regina 740 and have thought of changing injectors as well
i will definitely circle back around because i think this will be a huge improvement over 230k old stock injectors.

i did update my original post to correct some misinformation on the regina * yellow * tops. because of that change i'm no longer considering the orange or red injectors because they're too big (since i have no other supporting mods and this is a stock high-mileage brick). im trying to choose between grey, pink, or yellow from forums member mblue240's thread: http://forums.turbobricks.com/showthread.php?t=301784

Pink (0280155832) @ 22.5 lbs/hr & 12ohm
Grey (0280155702) @ 19 lbs/hr & 12ohm
Yellow (0280155746) @ 19 lbs/hr @ 15.95ohm

im leaning towards pretty in pink

Last edited by yolk; 02-26-2021 at 03:57 PM..
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Old 02-13-2021, 11:35 AM   #9
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i've settled on the pinkies and forums member mblue240 is shipping out 5 (can't forget the cold-start injector!) to come in by next week so ill check in with this thread again when theyre installed.
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Old 02-14-2021, 02:03 PM   #10
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Hate to be that guy but the pink injector is for a 4 valve engine. It is a split beam spray pattern that will just spray the walls on our 2 valve heads. I ran them for a bit on mine without knowing.

Also the cold start injector is a completely different standalone injector, it is not the same as the others!
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Old 02-14-2021, 04:38 PM   #11
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I just went and checked my 92 740 regina and I never realized it had a cold start injector, so glad you mentioned it. Itís been amazingly reliable so I havenít had to work on it much at all. Consider myself lucky for that!
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Old 02-14-2021, 11:24 PM   #12
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Quote:
Originally Posted by esmth View Post
Hate to be that guy but the pink injector is for a 4 valve engine. It is a split beam spray pattern that will just spray the walls on our 2 valve heads. I ran them for a bit on mine without knowing.

Also the cold start injector is a completely different standalone injector, it is not the same as the others!
thanks for the heads up on those points

i noticed that the spray pattern was different but didn't think it would be a huge issue so we'll see how they compete against the very original, and very varnished injectors (~230k miles) that are currently on there. even if they act as a stop gap while i get the others cleaned, then great.

my lazy searches didn't turn up much info on the cold start injector, besides that folks were plumbing them to supply extra fuel for boosted setups, plus volvo's TSB on them.

ill keep plowing ahead and post results, regardless.
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Old 02-25-2021, 05:48 PM   #13
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just an update on everything; i got our injectors in today!

actually, i made a last minute order change and switched to the yellow injectors (0280155746 @ 19 lbs/hr & 15.95ohm) because esmths comment stuck with me and mblue240 was super gracious to change things at the last minute. if all that ice/snow hadn't fallen then everything would have shipped asap i'd be still going ahead with the pinkies.

tomorrow ill grab some new o-rings, install the injectors, and report back on the first impressions (start-up, idle, accel), but because we don't drive as much due to WFH it will be a while before we'll actually get a few tanks of gas through it so bear with me on that.

still, stay tuned because ill try to get pictures of the old injectors and whatever varnish they may have (236k on the odometer as of today).
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Old 02-26-2021, 03:39 PM   #14
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done and done.
here is video proof: https://youtu.be/faJqQgdfqho

start-up, idle, and delivery of power across the entire band are all noticeably smoother in the 25 miles i've put on it today.
i'll report back once we burn a through a few tanks of gas, but this is a simple and easy quality-of-life upgrade that took less than an hour (street parked in 40 degree weather even).

ive edited the OP to reflect my success and wish anyone well who does this on their own.
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Old 02-26-2021, 04:12 PM   #15
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Well done! Enjoy that smooth red block.
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Old 02-26-2021, 06:31 PM   #16
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Nicely done. Curious to see if gas mileages changes or improves at all.
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Old 02-26-2021, 06:58 PM   #17
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Quote:
Originally Posted by dl242gt View Post
Well done! Enjoy that smooth red block.
thanks!

ive still got to figure out a way to service or replace the cold start injector thats stuffed down between the #2 & #3 intake runners because it's probably as gummed up as much as the other 4 injectors i pulled out today.

esmth called this out in their post as well; its not the same as the other injectors (eg. it uses a banjo fitting for fuel supply).

Last edited by yolk; 02-26-2021 at 07:56 PM..
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Old 02-26-2021, 10:02 PM   #18
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Quote:
Originally Posted by dorvin View Post
Nicely done. Curious to see if gas mileages changes or improves at all.
i appreciate it and, yea, ill keep the thread updated after we run a few tanks through it and we crunch the numbers.

in the meanwhile enjoy some pictures from our camping this summer after we drove up to MI

https://i.imgur.com/jjK4BHW.jpg

https://i.imgur.com/ny8T1uv.jpg
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Old 02-27-2021, 03:10 PM   #19
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Looks nice. The updated lights make those cars look so much better. Camping in the lush woods is a good getaway.
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