Understanding 38mm vs 44mm

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Old May 10, 2021 | 01:36 AM
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Default Understanding 38mm vs 44mm

Specs
ls block
81.5 cp piston 10:1 manleycrods
b16 head
type r cams supertech dual valve springs

speedfactory miniram with 2 bolt wg
tial wg 38mm

maxingspeed gt35 .70/.63 turbo


wanting max power itll make off spring / ebc

my question i still dont understand too well

will this suffice
im expecting to make 350-400whp
i just dont understand too much 38 vs 44

someone said big turbo small wg
small turbo big wg
I just need a actual answer this work perfectly fine?





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Old May 10, 2021 | 05:43 AM
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Default Re: Understanding 38mm vs 44mm

A mildly truncated answer; high boost small turbo, small WG. Low boost big turbo, big WG. This isn't all-inclusive but, a general nod to an answer. Lol!
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Old May 10, 2021 | 07:02 AM
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Default Re: Understanding 38mm vs 44mm

GT35 for 350-400whp?

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Old May 10, 2021 | 07:54 AM
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Default Re: Understanding 38mm vs 44mm

You also gotta consider wastwgate placement. Looks like that manifold has a sharp 90 into the wastegate flange. 38 or 44 itll creep.

I spent a lot of time making a nice big tear drop going into the wastegate flange. Very small creep with a 38mm and 18g turbo also with a gt2871r turbo.

Shoot some water down each runner and youll see how much makes its way to the wastegate flange.
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Old May 10, 2021 | 09:15 AM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by Stopsign32v
GT35 for 350-400whp?

It's a Maxingspeed Unit, so the measurements of the wheels could tell a completely different story as the turbocharger's capabilities. That's the bigger question (IMHO) that needs to be answered by the OP first.
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Old May 10, 2021 | 09:50 AM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by TheShodan
It's a Maxingspeed Unit, so the measurements of the wheels could tell a completely different story as the turbocharger's capabilities. That's the bigger question (IMHO) that needs to be answered by the OP first.
I guess I’ll never understand the Honda crowd $300 turbo mentality. Either pony up or don’t do it IMO.

Seems like a sure road to disappointment and broken hearts
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Old May 10, 2021 | 10:24 AM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by KiNGDEE206
I just need a actual answer this work perfectly fine?


I think you’ll be fine. If you start to go over 400 horsepower, however, then you’ll be producing lots of exhaust, so then you should switch to the 44mm wastegate.
Speedfactory makes good parts. The WG placement is at 90 degrees which isn’t ideal but it’s placed in a good spot where the collector is and it doesn’t stick out far.
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Old May 10, 2021 | 10:31 AM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by Stopsign32v
I guess I’ll never understand the Honda crowd $300 turbo mentality. Either pony up or don’t do it IMO.

Seems like a sure road to disappointment and broken hearts
Not all of them are horrible. I've tested a couple of the Maxpeedingrods turbos and they are not bad at all for the cost. They're certainly good enough to produce some power and I'd imagine like other "budget" units, could be hit or miss for quality. Maxpeedingrods is one of the VERY SMALL number of Chinese makers that actually offer a warranty as well.. I couldn't say they'd be suited for full-time track use or anything but, I wouldn't say they're not good for the cost.
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Old May 10, 2021 | 10:58 AM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by Txdragon
Not all of them are horrible. I've tested a couple of the Maxpeedingrods turbos and they are not bad at all for the cost. They're certainly good enough to produce some power and I'd imagine like other "budget" units, could be hit or miss for quality. Maxpeedingrods is one of the VERY SMALL number of Chinese makers that actually offer a warranty as well.. I couldn't say they'd be suited for full-time track use or anything but, I wouldn't say they're not good for the cost.
That’s a good way to put it. In my opinion I don’t try these kinds of brands, but some of them do function fine for a lower cost.
I remember when Blox came out with their exhaust manifold that was the same as the InlinePro one, and people thought it wouldn’t last, but now Blox has a pretty good reputation.
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Old May 10, 2021 | 11:07 PM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by Stopsign32v
I guess I’ll never understand the Honda crowd $300 turbo mentality. Either pony up or don’t do it IMO.

Seems like a sure road to disappointment and broken hearts
bought it for 100 bnib second hand so ill test it out

Just a weekend warrior garaged

when i get the chance i will micrometer it for the shodan

im in a facebook turbo for hondas lots of em use the maxingspeed turbo so i figured 100 why not
later down the road ill build anew block with a 1k (thatl suffice yea?)turbo with my setup
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Old May 11, 2021 | 05:32 AM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by KiNGDEE206
im in a facebook turbo for hondas
It all makes sense now
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Old May 11, 2021 | 12:32 PM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by Stopsign32v
I guess I’ll never understand the Honda crowd $300 turbo mentality. Either pony up or don’t do it IMO.

Seems like a sure road to disappointment and broken hearts
I can see the use of them if they were for some RallyCross-Don't Care What It Does- type of builds, or for those that know exactly what they're getting into (and, to be fair, some people actually do.)
Otherwise, no. I found no need for taking such a risk of the entire car based upon that kind of budget turbocharger. But to each their own. I'm not one to judge like I used to .
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Old May 11, 2021 | 08:24 PM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by TheShodan
I can see the use of them if they were for some RallyCross-Don't Care What It Does- type of builds, or for those that know exactly what they're getting into (and, to be fair, some people actually do.)
Otherwise, no. I found no need for taking such a risk of the entire car based upon that kind of budget turbocharger. But to each their own. I'm not one to judge like I used to .
Forgive them father for they know not what they do.
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Old May 11, 2021 | 08:30 PM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by JRCivic1
Forgive them father for they know not what they do.
LMAO!!!
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Old May 12, 2021 | 04:10 AM
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Default Re: Understanding 38mm vs 44mm

Originally Posted by TheShodan
I can see the use of them if they were for some RallyCross-Don't Care What It Does- type of builds, or for those that know exactly what they're getting into (and, to be fair, some people actually do.)
Otherwise, no. I found no need for taking such a risk of the entire car based upon that kind of budget turbocharger. But to each their own. I'm not one to judge like I used to .
im proud of you! The so called cheap turbos are not designed to be used in a daily type car, they will probably never take the day in/out abuse. Mine is a track only car and the budget turbo does a great job...... matter of fact, when I lost my oil pump and it killed the turbo from lack of oil, it hurt a lot less spending 350 instead of another 2k on that turbo.
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Old May 12, 2021 | 07:08 AM
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Default Re: Understanding 38mm vs 44mm

The biggest difference between cheap turbos and quality turbos (besides how long they will last) is what your goals are. For example, lets say you are running events where turbo size is a rule, I'm not going to run some Speedmax 62mm turbo over a Precision 62mm. Now if you're trying to go fast, again I wouldn't choose a piece of **** to run on my car over a good one. I have personally been at the track running multiple types of turbo chargers and TRUST ME when I say they make a difference. I remember when I was testing a **** ton of Garrett turbos and Comp turbos, I was at an IFO event where I was running a BB Garrett 67mm turbo and the entire event I could not go faster than 9.5. So I decided to buy a precision 6870, my first pass at the next IFO event was a 9.2, second pass was an 8.9 and my fastest pass on that turbo was an 8.8.

Now I'm not knocking Garrett or anything because I've run 9's on an off the shelf 61mm Garrett and I have friends who are going 8.4's on Garrett turbo's. The point is, I've seen guys running 9.8's on big old 72mm Rev9's in gutted *** cars and you have guys who are going mid 8's on Precision 62mm turbos. You don't see the fast Honda dudes running Rev911's LOL, they run quality ****. I'm now running a Gen2 Precision 7285, a 4k turbo but I spent 2k because I got it used with a few passes on it. I'm sure if you look hard enough you can find good quality used turbos for good prices, hell I've seen good 62mm BB Precision Units selling for 1200 used. So you can spend $300 for a Shit9 or another $900 for a quality turbo, choice is yours.

Now if your goal is to be cheap as hell, don't care about how fast you're going to go and could care less about longevity, no problem do as you please. Normally I lay low and people do what they want to do but I always get a kick when you see people making decisions that are going to come back and bite them in the ***.

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