740 High mileage rex/regina injectors (blue, red, orange)

yolk · 02-03-2021, 11:12 PM

I'm looking to upgrade the blue 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 blue tops @ 24lbs/hr but i am seeing that they're part #1389563 and rated at 18lbs/hr (vs 24lbs/hr like i originally thought)

dl242gt · 02-05-2021, 02:06 PM

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.

yolk · 02-06-2021, 12:17 AM

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

yolk · 02-06-2021, 12:32 AM

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?

dl242gt · 02-06-2021, 03:55 PM

1.5 ohms difference isn't enough to matter. The injector will work fine. Good luck with your quest.

yolk · 02-10-2021, 08:46 PM

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

oldnfast · 02-10-2021, 08:51 PM

Please do a update. I have a regina 740 and have thought of changing injectors as well

yolk · 02-10-2021, 09:18 PM

Quote:

Originally Posted by oldnfast

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 bluetops. 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

yolk · 02-13-2021, 11:35 AM

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.

esmth · 02-14-2021, 02:03 PM

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!

oldnfast · 02-14-2021, 04:38 PM

I just went and checked my 92 740 regina and I never realized it had a cold start injector, so glad you mentioned it. It’s been amazingly reliable so I haven’t had to work on it much at all. Consider myself lucky for that!

yolk · 02-14-2021, 11:24 PM

Quote:

Originally Posted by esmth

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.

02-05-2021, 02:06 PM	#2
dl242gt Happy playing the blues Join Date: Jun 2002 Location: S NJ, a suburb of Phila.	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. __________________ Dave, 1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration. 1993 245 Classic, 430k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.

02-06-2021, 12:17 AM	#3
yolk Board Member Join Date: Oct 2005 Location: Minneapples	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..

02-14-2021, 02:03 PM	#10
esmth Board Member Join Date: Jul 2016 Location: MA/NH	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! __________________ 1991 244 LH2.4 M46 341k miles

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02-03-2021, 11:12 PM	#1
yolk Board Member Join Date: Oct 2005 Location: Minneapples	High mileage rex/regina injectors (blue, red, orange) I'm looking to upgrade the blue 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 blue tops @ 24lbs/hr but i am seeing that they're part #1389563 and rated at 18lbs/hr (vs 24lbs/hr like i originally thought) Last edited by yolk; 02-10-2021 at 09:15 PM.. Reason: corrected wrong information

02-06-2021, 12:32 AM	#4
yolk Board Member Join Date: Oct 2005 Location: Minneapples	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?

02-06-2021, 03:55 PM	#5
dl242gt Happy playing the blues Join Date: Jun 2002 Location: S NJ, a suburb of Phila.	1.5 ohms difference isn't enough to matter. The injector will work fine. Good luck with your quest.

02-10-2021, 08:46 PM	#6
yolk Board Member Join Date: Oct 2005 Location: Minneapples	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

02-10-2021, 08:51 PM	#7
oldnfast Board Member Join Date: Feb 2011 Location: connecticut	Please do a update. I have a regina 740 and have thought of changing injectors as well

02-13-2021, 11:35 AM	#9
yolk Board Member Join Date: Oct 2005 Location: Minneapples	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.

02-14-2021, 04:38 PM	#11
oldnfast Board Member Join Date: Feb 2011 Location: connecticut	I just went and checked my 92 740 regina and I never realized it had a cold start injector, so glad you mentioned it. It’s been amazingly reliable so I haven’t had to work on it much at all. Consider myself lucky for that!