How much difference does a 38R really make? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 28 (permalink) Old 06-10-2010, 03:17 AM Thread Starter
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How much difference does a 38R really make?

I was just wondering just how much difference does a 38R turbo really make on a late model 7.3L engine in terms of power, acceleration, EGTs, and smoke. Does it really give you more power? Without first spooling my turbo will it make my acceleration faster? How much will it really lower my EGTs? Does it help with reducing smoke at all? Also how much boost can the turbo really make? Websites say 40psi is the most but can it go higher then that or does it come in short? I just want to see what people are really seeing with the turbo before I spend all this money on it. Thanks for you the help!

2003 F-250 Super Duty 7.3L, AFE Stage 2 Cold Air Intake, AFE Intake Manifold, AFE 4" Turbo Back Exhaust, DP Tuner F6 (40Tow, 80Econo, 120Race), Snow Performance MPG MAX Water/Methonal Injection, Adrenaline HPOP, Zoodad Mod.
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post #2 of 28 (permalink) Old 06-10-2010, 03:41 AM
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Re: How much difference does a 38R really make?

you might not get more boost, but itll get there in what seems like half the time, significant drop in egt's and reduced smoke is just a bi product of the other things that it will do for you, as for seat of the pants feel? absolutely worth the money especially when they can be had for 1500 brand new, or easily found used by people going bigger. buuut when youre ready to do a set of injectors this turbo's a nice match to a set of like 238's or similar,

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post #3 of 28 (permalink) Old 06-10-2010, 03:44 AM
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Re: How much difference does a 38R really make?

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Originally Posted by Cessnakid View Post
I was just wondering just how much difference does a 38R turbo really make on a late model 7.3L engine in terms of power, acceleration, EGTs, and smoke. Does it really give you more power? YESWithout first spooling my turbo will it make my acceleration faster? HUH?? How much will it really lower my EGTs? Depends on how hot how much fuel etc but its significant Does it help with reducing smoke at all? Yes Also how much boost can the turbo really make? In what situation to many variables. Websites say 40psi and that would be correct in single use if you care about your engine and turbo longevity is the most but can it go higher then that or does it come in short? Again yes and no to both I just want to see what people are really seeing with the turbo before I spend all this money on it. Understandable. Do some searching and look at some signatures. Thanks for you the help!
The 38R is one of the top upgrades made to 7.3s. It is one fun turbo. Spools fast good usable power. Stock positions so simplest of all installs. One thing you do not see is many disappointed owners.

A 38R compared to a stock turbo. With proper fuel the 38r can make over 500 HPOP factory turbo in complete stock forum about 150 hp less and will likely not last.

The 40 psi is the highest it can flow in single form where it will still be inside its map (be efficient). Yes it can run higher but its the law of diminishing returns and is harder on the engine and turbo. Yes it lowers EGTS. How much depends on how much fuel is sued and how hot it is. More air with the same amount of fuel if there is smoke will reduce it by the amount of extra air flowed. Understand there is more to it than boost. 30 psi of boost in a stock turbo and 38R provide very different amount of air flow and power. The 38R is more efficient.

Honestly doing a few searches on just about any 7.3 forum and you can see how popular the upgrade is. Do you really think it woudl be so if it was just a mediocre upgrade in overall performance.
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post #4 of 28 (permalink) Old 06-10-2010, 05:10 AM
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Re: How much difference does a 38R really make?

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The 38R is one of the top upgrades made to 7.3s. It is one fun turbo. Spools fast good usable power. Stock positions so simplest of all installs. One thing you do not see is many disappointed owners.

A 38R compared to a stock turbo. With proper fuel the 38r can make over 500 HPOP factory turbo in complete stock forum about 150 hp less and will likely not last.

The 40 psi is the highest it can flow in single form where it will still be inside its map (be efficient). Yes it can run higher but its the law of diminishing returns and is harder on the engine and turbo. Yes it lowers EGTS. How much depends on how much fuel is sued and how hot it is. More air with the same amount of fuel if there is smoke will reduce it by the amount of extra air flowed. Understand there is more to it than boost. 30 psi of boost in a stock turbo and 38R provide very different amount of air flow and power. The 38R is more efficient.

Honestly doing a few searches on just about any 7.3 forum and you can see how popular the upgrade is. Do you really think it woudl be so if it was just a mediocre upgrade in overall performance.
TARM, you tackled this one pretty well, especially the part in bold. I personally could care less if my boost numbers were 20, 30, or 40psi, if I have the airflow I need and the turbo is staying close to it's max. efficiency.

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post #5 of 28 (permalink) Old 06-10-2010, 05:45 AM
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Re: How much difference does a 38R really make?

think I'm going to save TARM's reply for the next 38 38r threads there will be this month.

Very well said bud.

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post #6 of 28 (permalink) Old 06-10-2010, 01:49 PM
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Re: How much difference does a 38R really make?

Makes a big difference. You will get the 38R and you will not be dissapointed.

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post #7 of 28 (permalink) Old 06-10-2010, 02:43 PM
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Re: How much difference does a 38R really make?

I love the 38R. As was already stated, it's a great match with injectors of the hybrid 238/80 flavor. With the right supporting mods, that combo should make 475ish street/tow-friendly RWHP (and be a heck of a lot of fun). However, if I never planned on going with bigger injectors than stock, it would be hard for me to justify the expense.

Also, at 40psi, the 38R is already way outside of it's map. It starts losing the 1:1 BP ratio around the 30psi mark, IIRC. There-in lies the trade-off. In order to get the low boost threshold, you will run the turbo out of it's map on the top-end to get to the ~40psi mark (but will still make ~475rwhp).
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post #8 of 28 (permalink) Old 06-10-2010, 03:09 PM
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Re: How much difference does a 38R really make?

As for your acceleration without first "spooling" it SHOULD as long as you go with the 1.0 housing.

I believe what he meant Tarm is without first building boost on the line. But yes, a BB turbo generally spools a few hundred RPM faster.


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post #9 of 28 (permalink) Old 06-10-2010, 04:30 PM
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Re: How much difference does a 38R really make?

I dont have bigger injectors in my truck just stockers and it is well worth it. Anything over 25PSI is out of a stockers MAP and at 25 PSI it wont last all that long either. If you get the 38R and just have a chip and never plan on anything else its still well worth the money.

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post #10 of 28 (permalink) Old 06-10-2010, 10:59 PM Thread Starter
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Re: How much difference does a 38R really make?

Yeah sorry for the confusion on "spooling my turbo". What I meant was with out first building boost up on the line. I'm really trying to make my truck have a throw you back in your seat kinda feel when I gun it. Right now it just seems like its so slow to respond. My buddy has an 06 Duramax and with his VGT that thing throws you back in your seat off the line and on the highway. So I'm trying to make my truck more responsive and have more overall power. If I could make my truck beat my buddies that would be great cause all he has on his is a Banks intake, exhaust and Six-Gun. I'm so tired of him calling my truck the "SlowStroke" that I either have to beat him in the 1/4 mile or on a dyno, either way, just something I can rub in his face. I know I'm gonna have to get a new turbo, and new injectors but I just wanted to make sure that a 38R would give me the results that I'm looking for.

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