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post #1 of 83 (permalink) Old 02-01-2009, 07:31 PM Thread Starter
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38r questions

Whats the best setup on a 38r? wastegate or no wastegate? What do you see for boost outta these things with a gate and/or without? I have seen some run them with the a/r 1.15 non-wastegated housing, just wondering what the general opinion is on that. Whats turbo lif expectancy like when not running a wastegate? Any ifno is greatly appreciated, thanks!

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post #2 of 83 (permalink) Old 02-01-2009, 07:55 PM
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Re: 38r questions

It all depends on what injectors you are running. I have the 38R on my truck and I have the stock injectors. My wastegate is set so that it never opens. I don't push the turbo hard enough to require a functional wastegate on the 1.0 turbine housing, and I don't need the 1.15 housing either. The only thing that will get me with my setup is a bit more lag on the bottom end.

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post #3 of 83 (permalink) Old 02-01-2009, 07:59 PM
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Re: 38r questions

I had the 38r with the 1.0 and the 1.15 housing. For me the 1.15 housing was better. 38r with 1.15 housing (non wastegate) with 238cc hybrids I saw 42 psi max boost. 10-35 psi was amazing in the 120 tune @ 1500 degrees. In the 140 tune I could hit 1700 degree's and hit the 40+ psi...

Also dynoed 470 RWHP with an exhaust leak that you wouldn't believe with the 1.0 housing.

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post #4 of 83 (permalink) Old 02-01-2009, 08:34 PM Thread Starter
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Re: 38r questions

What're you seein for Boost and EGT's Curtis?

Marty, you have a little more fuel then I do, lol

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post #5 of 83 (permalink) Old 02-01-2009, 09:12 PM
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Re: 38r questions

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What're you seein for Boost and EGT's Curtis?
Boost will hit up to about 30 PSI. Max EGT's will hit just a hair under 1200 degrees in my highest chip setting.

Curtis
2002 F-250 PSD
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post #6 of 83 (permalink) Old 02-01-2009, 09:53 PM
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Re: 38r questions

One thing to keep in mind...

While you may be running the 1.0 housing with the gate shut, and making happy boost/power/response, the 1.15 housing would make more power, around the same boost and very similar "response", as long as response means engine power, and not boost needle movement. This is because it "handles" the exhaust side so much better (efficiently). And unless you've got it wired shut/welded, it's hard to say for sure the gate isn't opening on you. In my experience anyway.

On the dyno my truck made more power at all points from 1000 to 3600rpm with the 1.15 housing on the 38R as a single. There was not one spot where the 1.0 housing touched the 1.15 on power or torque.

Just throwing that out there.
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post #7 of 83 (permalink) Old 02-01-2009, 10:36 PM
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Re: 38r questions

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Originally Posted by Charles View Post
One thing to keep in mind...

While you may be running the 1.0 housing with the gate shut, and making happy boost/power/response, the 1.15 housing would make more power, around the same boost and very similar "response", as long as response means engine power, and not boost needle movement. This is because it "handles" the exhaust side so much better (efficiently). And unless you've got it wired shut/welded, it's hard to say for sure the gate isn't opening on you. In my experience anyway.

On the dyno my truck made more power at all points from 1000 to 3600rpm with the 1.15 housing on the 38R as a single. There was not one spot where the 1.0 housing touched the 1.15 on power or torque.

Just throwing that out there.
At lower altitude, that might be so. Heck, with stock injectors, there's no need for a wastegate on the 38R in either the 1.0 or the 1.15 configuration. Also, I have ridden in Jacob's truck back before he made a few changes to his truck, and I've heard the 38R surge under his hood. Mine doesn't surge, but I know better than to say that these turbos are surge free. The 1.15 housing does help with surge issues. So that can be another advantage of running it over the 1.0 housing. So yeah, I can see where you are coming from Charles. The best combo can be found with a little trial and error, and a dyno or drag strip is definitely handy when trying to dial in your combo.

I can only speak from what I see, but up here in Colorado, turbo lag is a huge problem. Even stock turbos are laggy turds, and that lag creates big problems for daily drivability. It's much more difficult to squeeze out power below 2000 RPM's (and especially below 1500 RPM's) at high altitude than it is at sea level. I think that's where having the 38R running a 1.15 housing on a stock injectored truck might have some issues. But that's my opinion. Maybe one day we can find out for sure. Would be fun to have a .84 housing laying around too, just to do a 3 way comparison.

Oh and don't worry Charles, there's no way my wastegate opens up.

Curtis
2002 F-250 PSD
Gambling with 250/200's on PMR's.
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post #8 of 83 (permalink) Old 02-02-2009, 04:00 AM
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Re: 38r questions

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Originally Posted by Charles View Post
On the dyno my truck made more power at all points from 1000 to 3600rpm with the 1.15 housing on the 38R as a single. There was not one spot where the 1.0 housing touched the 1.15 on power or torque.

Just throwing that out there.
How much more power are we talking?
I just got my 38R last week and love it so far. How would the 1.15 affect around town driving? That is where my truck spends most of the time. I'm sure the 1.15 would be great for towing our TT though. I should add, I have stock injector still.

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post #9 of 83 (permalink) Old 02-02-2009, 04:36 AM Thread Starter
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Re: 38r questions

Quote:
Originally Posted by Charles View Post
One thing to keep in mind...

While you may be running the 1.0 housing with the gate shut, and making happy boost/power/response, the 1.15 housing would make more power, around the same boost and very similar "response", as long as response means engine power, and not boost needle movement. This is because it "handles" the exhaust side so much better (efficiently). And unless you've got it wired shut/welded, it's hard to say for sure the gate isn't opening on you. In my experience anyway.

On the dyno my truck made more power at all points from 1000 to 3600rpm with the 1.15 housing on the 38R as a single. There was not one spot where the 1.0 housing touched the 1.15 on power or torque.

Just throwing that out there.
How hard(long) is it to change out housings?

and at what point fuel wise would you see it necessary to upgrade to the 1.15 housing?

Cowboy Steve
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post #10 of 83 (permalink) Old 02-02-2009, 04:42 AM
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Re: 38r questions

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Originally Posted by Powerstroked162 View Post
How hard(long) is it to change out housings?

and at what point fuel wise would you see it necessary to upgrade to the 1.15 housing?

Cowboy Steve
They never should of sold the 38r with the 1.0 housing. It spools so well with the 1.15 that it should of been standard...

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