LS Power steering pump, Hydroboost vs non-hydroboost - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SierraMtns · 08-31-2019, 01:42 PM

Does anyone know if the power steering pumps with Hydro boost have higher pressure then the non-hydro boost pumps? The only difference I can find so far is they have an extra re-turn line.

I am working on power steering lines this weekend on the 67.

Thanks

**mongocanfly** · 08-31-2019, 02:44 PM

I read all I could find on the 2 pumps and never got a clear answer....so I added a extra return fitting to my stock non-hydroboost pump....I also have a hydroboost pump on my C30 and see no difference between the 2 other than the extra hose barb

**clay68c10** · 08-31-2019, 08:44 PM

I’ve heard if the donor vehicle had a steering box you are ok, and if it had a rack and pinion you will have low pressure. I don’t know if this is legit or here-say.

**Captainfab** · 08-31-2019, 11:25 PM

I hadn't thought about it but that makes sense since a R&P operates at a lower pressure than a steering box.

Quote:

Originally Posted by clay68c10

I’ve heard if the donor vehicle had a steering box you are ok, and if it had a rack and pinion you will have low pressure. I don’t know if this is legit or here-say.

solidaxel · 09-02-2019, 10:39 PM

Waiting for some good numbers, on either one!

SierraMtns · 09-04-2019, 11:41 AM

Quote:

Originally Posted by Captainfab

I hadn't thought about it but that makes sense since a R&P operates at a lower pressure than a steering box.

Yeah finding a pump that came out of R&P car is a good idea. I never like having a over powered steering system.

e015475 · 09-04-2019, 12:38 PM

Pressure you can adjust with a spring on the discharge port of the pump. Flow is a function of displacement of the pump. A hydroboost and a rack will take more flow than just the rack.

I'd run the type 2 Saginaw pump that came on your LS motor first to see how it works. Is there any LS motor that came in a truck or car that didn't have a rack and pinion?

Off road cars running the LS Saginaw pump often use a ram steering setup and there's higher flow Saginaw pumps to meet the higher demand of the ram steering.

If you need more flow, you can buy a bigger pump from Howe Steering and several others. LS trucks have a different steering pump shaft size than cars do, so be careful.

They also sell different pullies for the Saginaw TC pump that will change the flow rate.

Pontitruck · 09-04-2019, 06:59 PM

Chiming in here to learn as my swap 5.3 has 3 fittings and I was trying to determine if I could just cap one off and use it or needed to get a 2 port pump. I’m assuming my donor had hydroboost.

**mongocanfly** · 09-04-2019, 08:07 PM

yes. you can just cap off one of the return line ports on the tank..no problem..

SierraMtns · 09-04-2019, 10:54 PM

Quote:

Originally Posted by Captainfab

I hadn't thought about it but that makes sense since a R&P operates at a lower pressure than a steering box.

Quote:

Originally Posted by Pontitruck

Chiming in here to learn as my swap 5.3 has 3 fittings and I was trying to determine if I could just cap one off and use it or needed to get a 2 port pump. I’m assuming my donor had hydroboost.

Yes I am clamping off the upper of the 2 return lines.

08-31-2019, 01:42 PM	#1
SierraMtns Registered User Join Date: Jun 2014 Location: Shingle Springs, CA Posts: 869	LS Power steering pump, Hydroboost vs non-hydroboost Does anyone know if the power steering pumps with Hydro boost have higher pressure then the non-hydro boost pumps? The only difference I can find so far is they have an extra re-turn line. I am working on power steering lines this weekend on the 67. Thanks

08-31-2019, 02:44 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,670	Re: LS Power steering pump, Hydroboost vs non-hydroboost I read all I could find on the 2 pumps and never got a clear answer....so I added a extra return fitting to my stock non-hydroboost pump....I also have a hydroboost pump on my C30 and see no difference between the 2 other than the extra hose barb Attached Images __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

08-31-2019, 08:44 PM	#3
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,991	Re: LS Power steering pump, Hydroboost vs non-hydroboost I’ve heard if the donor vehicle had a steering box you are ok, and if it had a rack and pinion you will have low pressure. I don’t know if this is legit or here-say. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

09-02-2019, 10:39 PM	#5
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: LS Power steering pump, Hydroboost vs non-hydroboost Waiting for some good numbers, on either one! __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

09-04-2019, 12:38 PM	#7
e015475 Registered User Join Date: Nov 2013 Location: Show Low, Arizona Posts: 778	Re: LS Power steering pump, Hydroboost vs non-hydroboost Pressure you can adjust with a spring on the discharge port of the pump. Flow is a function of displacement of the pump. A hydroboost and a rack will take more flow than just the rack. I'd run the type 2 Saginaw pump that came on your LS motor first to see how it works. Is there any LS motor that came in a truck or car that didn't have a rack and pinion? Off road cars running the LS Saginaw pump often use a ram steering setup and there's higher flow Saginaw pumps to meet the higher demand of the ram steering. If you need more flow, you can buy a bigger pump from Howe Steering and several others. LS trucks have a different steering pump shaft size than cars do, so be careful. They also sell different pullies for the Saginaw TC pump that will change the flow rate.

09-04-2019, 06:59 PM	#8
Pontitruck Registered User Join Date: Sep 2018 Location: South of the Indy 500 Posts: 116	Re: LS Power steering pump, Hydroboost vs non-hydroboost Chiming in here to learn as my swap 5.3 has 3 fittings and I was trying to determine if I could just cap one off and use it or needed to get a 2 port pump. I’m assuming my donor had hydroboost.

09-04-2019, 08:07 PM	#9
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,670	Re: LS Power steering pump, Hydroboost vs non-hydroboost yes. you can just cap off one of the return line ports on the tank..no problem.. __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver



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