38r drive pressure - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 15 (permalink) Old 07-28-2008, 12:03 AM Thread Starter
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38r drive pressure

Would I be correct to assume that drive pressure is lower with a 1.15 A/R vs. a 1.0 A/R? If so what is the difference at say 35 lbs boost?

99.5 F-350 SRW 6 speed mods:PHP live tuned., MSD propane system, snow water injection,DDP stage 1 injectors,AFE stage II air intake,ITP boost regulater,3.5 turbo back exaust,FASS fuel system. Gulf Coast oil bypass filtration, ITP reg. return, HPX oil line , GTP 38r with 1.15,EBPV delete. 430,000 miles,Adrenaline HPOP
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post #2 of 15 (permalink) Old 07-28-2008, 03:09 PM
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Re: 38r drive pressure

With the 1.00 housing I saw 30# boost vs 45# drive pressures... With the 1.15 housing it was 30# to about 35-37# drive pressures.

This was with the 38r...

[CENTER]01 F-250 SC PSD,430k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100, Studs, 910 springs, Forged rods, Hydra chip, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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post #3 of 15 (permalink) Old 07-30-2008, 02:04 AM
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Re: 38r drive pressure

I thought it was much more efficient than that

'95 PSD 3" RSK, 3" bodylift, 37x13.50x20 xterrains. Tymar intake,ARP studs, comp 910s, DIY 238 hybrids with 200% nozzles, 6.0 intercooler, 3.5" downpipe to dual 4" stacks, CCV mod, IDM mod, DP tuner mod stock, 40t, 80e, 140r, fass 150/180, ITP regulated return, TE big oil, GTP38r turbo, lookin for 500 ponies
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post #4 of 15 (permalink) Old 07-31-2008, 02:06 AM Thread Starter
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Re: 38r drive pressure

yea i've got a 38r ready to go in with the 1.0,I'm just looking for a good reason to justify a few extra clams for the 1.15. I'm seldom at WFO unless pulling a trailer so I'm not sure how useful or needed this is for Me. The thought of less parasidic HP loss sounds good and as Charles said the sound of an exhaust with the 1.15 makes it very worthwhile.

99.5 F-350 SRW 6 speed mods:PHP live tuned., MSD propane system, snow water injection,DDP stage 1 injectors,AFE stage II air intake,ITP boost regulater,3.5 turbo back exaust,FASS fuel system. Gulf Coast oil bypass filtration, ITP reg. return, HPX oil line , GTP 38r with 1.15,EBPV delete. 430,000 miles,Adrenaline HPOP
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post #5 of 15 (permalink) Old 07-31-2008, 02:10 AM
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Re: 38r drive pressure

I would NEVER install a 38R with the 1.0 unless I couldn't get the 1.15

It is just much happier IMO. It's not the end of the world to swap them later though. Run it with the 1.0 then the 1.15 and draw your own conclusion. If you don't like the 1.15 send it to me and I'll put it on my 550.

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post #6 of 15 (permalink) Old 07-31-2008, 02:11 AM
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Re: 38r drive pressure

The 1.15 is the only way that turbo should be sold... Makes more power with lower EGT's across the board. Its still in my wifes X with the 1.15 and 37's with 3.73's...

[CENTER]01 F-250 SC PSD,430k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100, Studs, 910 springs, Forged rods, Hydra chip, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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post #7 of 15 (permalink) Old 07-31-2008, 02:19 AM
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Re: 38r drive pressure

Quote:
Originally Posted by cantrellc123 View Post
yea i've got a 38r ready to go in with the 1.0,I'm just looking for a good reason to justify a few extra clams for the 1.15. I'm seldom at WFO unless pulling a trailer so I'm not sure how useful or needed this is for Me. The thought of less parasidic HP loss sounds good and as Charles said the sound of an exhaust with the 1.15 makes it very worthwhile.
I was right there on the edge too...Until I saw this thread. Two very knowledgable guys making such a strong recommendation has convinced me. I'm mostly looking to reduce the egts a little bit more.

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post #8 of 15 (permalink) Old 07-31-2008, 04:29 AM
 
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Re: 38r drive pressure

I don't remember my drive pressure with the 1.15 but know it was real close to 1:1 under most conditions while live tuning and I believe it hit about 38 at 33 during a good run. EGTs are a non-issue now. I rarely look at that gauge anymore.
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post #9 of 15 (permalink) Old 07-31-2008, 01:20 PM
 
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Re: 38r drive pressure

How aare you guys measuring drive pressure? I can see back pressure.

Thanks.
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post #10 of 15 (permalink) Old 07-31-2008, 03:27 PM
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Re: 38r drive pressure

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Originally Posted by Muley View Post
How aare you guys measuring drive pressure? I can see back pressure.

Thanks.

Same thing for the most part... What is the pressure at the turbo inlet, or in the manifolds...

[CENTER]01 F-250 SC PSD,430k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100, Studs, 910 springs, Forged rods, Hydra chip, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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