Lets talk exhaust housings - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 21 Old 03-29-2011, 08:19 PM Thread Starter
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Lets talk exhaust housings

So i currently have a mp T70 on the car with a .68 housingThe car is an animal but feels like it is choking up around 5400rpms. What differences will i see if i go to a .81 or a .96 housing on my t70??? i understand spool up will be longer as now there really is none, boost is pretty instant.ibaught a .81 housing but for some reason i really think i should have gone with the .96. any insight from someone who has done this swap would be great!!




95GT: 302, TEA TFS heads, systemax, jay allen cam, t-70, 60lb inj, moates quarterhorse, dynamic c4, and so on...
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best so far (only pass on the car) 10.72 @ 123 (needs 3.27's)
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post #2 of 21 Old 03-30-2011, 10:14 AM
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I'm really new to this stuff but I have a on3 351w kit on the way and it comes with a .96 and 3.5" down. The 302 kit comes with a .68 and a 3" don't know if thats any helpfull info to you....

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post #3 of 21 Old 03-30-2011, 10:21 AM
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Quote:
Originally Posted by 331D1SCGT View Post
So i currently have a mp T70 on the car with a .68 housingThe car is an animal but feels like it is choking up around 5400rpms. What differences will i see if i go to a .81 or a .96 housing on my t70??? i understand spool up will be longer as now there really is none, boost is pretty instant.ibaught a .81 housing but for some reason i really think i should have gone with the .96. any insight from someone who has done this swap would be great!!

How big is your downpipe, if only 3" it will choke you up top. What kind of power you are making? after 630 .68 housing was choking my car bad so I change it to .96 and open downpipe and made 687rwhp and 677 torque but my valve springs floated. Now I have high load comp cams valve springs 120lb seat pressure I should be easy 700+rwhp.

Few things you want to look
Downpipe size, 4" will open up any back pressure
Valve springs
.81 housing should do you good

.68 spools fast, I was getting 8 psi by 2800 rpm and by 3500 I get 20 psi, now with .96 housing I get little lag and get 20 psi by 4k.

Voodoo racing innovation built 4v , powerglide, borg warner s475 at 29psi, custome turbo kit , pro efi ecu, Aeromotive fuel pump, aeromotive fuel rails, id 1000 injectors, e85. Best to date 1.36 60'
Best pass to date 8.92 at 156mph. Best 1/8 mile 5.6at 127 mph.
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post #4 of 21 Old 03-30-2011, 11:03 AM
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3" downpipe is good for about 700 bhp. The .81 will be good, the instant spool is fun for the street but u can only apply so much pedal before the tires give. The bigger housing will allow more power to the ground before the tires give. Hell my t4 choked my topend so I just upgraded to a t6


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post #5 of 21 Old 03-30-2011, 02:02 PM
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here is a video with my 78mm with a .96 ar.. it spooled up very easy and ran pretty good.. this was on a stock motor. you will be fine with that .81

cornbread004.mp4 video by ripnitup - Photobucket

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post #6 of 21 Old 03-30-2011, 03:53 PM
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3" downpipe is good for about 800hp. The .81 will be good, the instant spool is fun for the street but u can only apply so much pedal before the tires give. The bigger housing will allow more power to the ground before the tires give. Hell my t4 choked my topend so I just upgraded to a t6
Whats the motor combo?

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post #7 of 21 Old 03-30-2011, 04:19 PM
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3" downpipe is good for about 800hp. :
I don't think so, have seen little over 700 with 3" downpipe and power falls off right around 6k rpm. in twin turbo yes but not with single turbo unless it's 4cl

Voodoo racing innovation built 4v , powerglide, borg warner s475 at 29psi, custome turbo kit , pro efi ecu, Aeromotive fuel pump, aeromotive fuel rails, id 1000 injectors, e85. Best to date 1.36 60'
Best pass to date 8.92 at 156mph. Best 1/8 mile 5.6at 127 mph.
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post #8 of 21 Old 03-30-2011, 04:32 PM
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Reread that section of Max. Boost and the graph shows a little over 700bhp. My bad...post edited.


My setup was a TP38 @12lbs (off a Powerstroke), 302, T5, H/C/I and 3.90 gears....just the regular bolt ons, u know


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Last edited by goatnipples2002; 03-30-2011 at 07:42 PM.
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post #9 of 21 Old 03-30-2011, 07:06 PM
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My 331 with a MPT70 .96 logged full boost by 2800ish

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post #10 of 21 Old 03-30-2011, 08:24 PM
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what about the On3 76mm with .68 housing?
how will it react with a HCI 302?


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post #11 of 21 Old 03-30-2011, 10:52 PM
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Quote:
Originally Posted by 331D1SCGT View Post
So i currently have a mp T70 on the car with a .68 housingThe car is an animal but feels like it is choking up around 5400rpms. What differences will i see if i go to a .81 or a .96 housing on my t70??? i understand spool up will be longer as now there really is none, boost is pretty instant.ibaught a .81 housing but for some reason i really think i should have gone with the .96. any insight from someone who has done this swap would be great!!

There are a lot of variables involved here, on that setup you may actually see the best result on the .96 housing if you race the car. It may seem a tad counter intuitive, but a super fast boost ramp doesn't necessarily make a car easier to drive at the track or on the street. Having a "slight" amount of lag helps you get the car out of the hole, and what you may make up at higher rpms may actually make the car go faster.

Exhaust volume/velocity has too many variables for simple math. There are some guys on the turbo forums who are propeller-headed enough to actually calculate it.

The other problem, is too small a turbo, or a very constrained turbine housing can actually cause you to create a lot of backpressure and damage the turbo. I'm not sure why they ship those with a .68 housing, seems smaller then what most people are using. Is your wastegate opening when you are feeling that flattening at 5400? Backpressure will force a wastegate open even if the car isn't at target boost. If you keep trying to outsmart it you will lose, your motor will win, and you will be buying a new turbo.

Are those housings too expensive to buy both and test the *^&% out of it? They are actually easy enough where you could swap them at the track if you have enough cool down time. We would all have a good time reading about it!

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post #12 of 21 Old 03-31-2011, 10:45 AM Thread Starter
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THanks for all the good feedback guys i just decided to keepbthe 81 and order the 96 as well im going to try both. Honestly i have a feeling im going to stick with the 96.

95GT: 302, TEA TFS heads, systemax, jay allen cam, t-70, 60lb inj, moates quarterhorse, dynamic c4, and so on...
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post #13 of 21 Old 03-31-2011, 11:05 AM
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I have a pretty close to stock motor with a mp T70 with a .96 A/R and I see full boost at 3000rpms. It made 452 at 8psi on a hot day

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pretty interesting...although I knew a guy whose son chewed through the backseat of his new Chevy Blazer on a vacation once....the guy asked the kid why, and the kid said he was just bored....
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post #14 of 21 Old 03-31-2011, 12:43 PM
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you should check the exhaust pressure and see if its getting to high. That will tell you if you need a bigger ar.
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post #15 of 21 Old 03-31-2011, 05:49 PM
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I would like to know what size exhaust hosing on3 offer on the 70mm kit?

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post #16 of 21 Old 03-31-2011, 06:21 PM Thread Starter
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Whatever one you want thats where im ordering mine from

95GT: 302, TEA TFS heads, systemax, jay allen cam, t-70, 60lb inj, moates quarterhorse, dynamic c4, and so on...
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best so far (only pass on the car) 10.72 @ 123 (needs 3.27's)
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post #17 of 21 Old 04-01-2011, 02:40 AM
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Who makes the On3 70mm?

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post #18 of 21 Old 04-02-2011, 12:07 PM Thread Starter
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I honestly have no idea.

95GT: 302, TEA TFS heads, systemax, jay allen cam, t-70, 60lb inj, moates quarterhorse, dynamic c4, and so on...
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post #19 of 21 Old 04-02-2011, 01:13 PM
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I don't think so, have seen little over 700 with 3" downpipe and power falls off right around 6k rpm. in twin turbo yes but not with single turbo unless it's 4cl
I'm making 787RWHP @ 15psi which is about 900fwhp through a single 3"DP with full exhaust including tailpipes. This is on a 352ci motor that sees 7500rpm. Is it the best setup? No. Would a larger DP help? I'm sure it would. But don't count out a 3"DP. My backpressure is about 2:1 FWIW on a GTS 76mm with a .96 housing with a T4 flange.

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post #20 of 21 Old 04-02-2011, 08:53 PM
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Quote:
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you should check the exhaust pressure and see if its getting to high. That will tell you if you need a bigger ar.
x2

https://forums.corral.net/forums/turb...kpressure.html

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post #21 of 21 Old 04-04-2011, 12:22 AM
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I'm making 787RWHP @ 15psi which is about 900fwhp through a single 3"DP with full exhaust including tailpipes. This is on a 352ci motor that sees 7500rpm. Is it the best setup? No. Would a larger DP help? I'm sure it would. But don't count out a 3"DP. My backpressure is about 2:1 FWIW on a GTS 76mm with a .96 housing with a T4 flange.
Wow good to know , you sir have pixie dust motor that breath better then most of us!!!!!!!

Voodoo racing innovation built 4v , powerglide, borg warner s475 at 29psi, custome turbo kit , pro efi ecu, Aeromotive fuel pump, aeromotive fuel rails, id 1000 injectors, e85. Best to date 1.36 60'
Best pass to date 8.92 at 156mph. Best 1/8 mile 5.6at 127 mph.
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