Size difference. stock vs gt38r - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 20 (permalink) Old 01-17-2010, 05:14 PM Thread Starter
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Size difference. stock vs gt38r

So how much bigger is the gt38r compared to the stock 99 and up turbo?

2000 F-250 factory forged, six speed, 6" lift 37's on 20's, DP f-6,
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post #2 of 20 (permalink) Old 01-17-2010, 06:08 PM
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Re: Size difference. stock vs gt38r

its not really the size diffrence in the turbo that matters. you need to look at airflow(cfm).

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post #3 of 20 (permalink) Old 01-17-2010, 06:42 PM
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Re: Size difference. stock vs gt38r

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Originally Posted by montana350 View Post
So how much bigger is the gt38r compared to the stock 99 and up turbo?
4mm on the intake
8mm on the exhaust
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post #4 of 20 (permalink) Old 01-17-2010, 06:51 PM
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Re: Size difference. stock vs gt38r

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4mm on the intake
8mm on the exhaust
How are you figuring that?

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post #5 of 20 (permalink) Old 01-18-2010, 02:27 AM Thread Starter
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Re: Size difference. stock vs gt38r

ok if it's cfm then how much is the difference. i have the wicked wheel and 1.00 exhaust housing with no ebv. I still have surgeand can spike my egts with stock injectors. what happened to the next step up for drop ins i cant find any recent news is it available yet?

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post #6 of 20 (permalink) Old 01-18-2010, 03:38 AM
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Re: Size difference. stock vs gt38r

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How are you figuring that?
stock turbo has a 62mm compressor wheel and an 80 mm exhaust.

The 38R has a 66mm/88mm..
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post #7 of 20 (permalink) Old 01-18-2010, 03:51 AM
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Re: Size difference. stock vs gt38r

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ok if it's cfm then how much is the difference. i have the wicked wheel and 1.00 exhaust housing with no ebv. I still have surgeand can spike my egts with stock injectors. what happened to the next step up for drop ins i cant find any recent news is it available yet?
You may have a boost leak with the hight egt's?

Back to stock for now.

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post #8 of 20 (permalink) Old 01-18-2010, 12:59 PM
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Re: Size difference. stock vs gt38r

Here are some pics to compare size

1999.5 F-250 7.3l 4x4 6 spd Ported Heads, Head studs, valve springs, DI Push Rods, DI RR, 38R, Walbro fuel pump, 238cc Injectors from Nate @ Unlimited Diesel and Tuned by Matt @ Gearhead Automotive


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post #9 of 20 (permalink) Old 01-18-2010, 02:03 PM Thread Starter
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Re: Size difference. stock vs gt38r

thanks but what about the other drop in someone was working on another step up from the gt38r ?

2000 F-250 factory forged, six speed, 6" lift 37's on 20's, DP f-6,
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post #10 of 20 (permalink) Old 01-18-2010, 02:06 PM
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Re: Size difference. stock vs gt38r

How are your figuring the exhaust wheel is bigger?
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