Manifold selection

92lseg

New Member
Thanks for your help I'm sure ill be back later on in the build lol

I see on atps site they offer a t3 housing

I would need this to bolt it to the blox manifold correct?
 

Muckman

Not a M0derator
Correct, If you wanted to use the Blox then you would need the T3 turbine housing.
Or find a different manifold that fits the standard T25 turbine housing such as Greddy, HKS or Edlebrock.
 

Muckman

Not a M0derator
If you wanted to push the limits of the turbo then youd want to go with the larger T3 housing. Since you dont its best to stay with the native T25 housing. See if you can find a T25/T28 manifold that you like first.
 


92lseg

New Member
That's the issue the companies you listed don't sell just there manifolds, ad the hks one says it fits a d17, would that fit my ls?

T3 is super common flange lol

Also after some reading most guys say the 28 is going to fall on it's face at 5000rpms..

When would this turbo spool up?

I don't care to redline the car all day but want a good deal of usable power band
 

Muckman

Not a M0derator
The flange is only a bolt pattern/housing size. Both versions have the same turbine wheel size so I wouldnt expect a big difference between the two. Since you dont expect to push the turbo close to its flow limit and its a lower reving LS I didnt feel the larger T3 housing was nessecary.

Spool would be 3500~4000rpm.

I found CXRacing, Godspeed and Neukin make T28 manifolds. But a T3 turbine housing would certainly be easier for you. See if you can find dynos with boost graph from both GT28 versions on similar engines. That will help alot.
 

92lseg

New Member
So I'm going to be in boost for 1500rpms?

Thanks for the manifold choices, I couldn't find much googling

Ill look for some graphs tonight
 


Muckman

Not a M0derator
Believe me, its not going to stop boosting at 5500. By "fall on its face" means the turbo is being outflowed by the engine. Back pressure builds up and boost pressure drops as will torque as a result. You will see a gradual decrease in boost as the turbo approaches this limit. Peak boost could be 12psi but you might see 10psi by redline. Often this easily can be fought with an electronic boost controller.

Here are some dynos that I found of the T3 GT28RS.
http://www.evans-tuning.com/forums/viewtopic.php?t=1559

Dyno and boost plot from Stock B16 GT28RS T3 .63 A/R at bottom
http://www.synapseturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=SM&Product_Code=syn-gar-012-01&Category_Code=turbos
 

92lseg

New Member
Muckman said:
Believe me, its not going to stop boosting at 5500. By "fall on its face" means the turbo is being outflowed by the engine. Back pressure builds up and boost pressure drops as will torque as a result. You will see a gradual decrease in boost as the turbo approaches this limit. Peak boost could be 12psi but you might see 10psi by redline. Often this easily can be fought with an electronic boost controller.

Here are some dynos that I found of the T3 GT28RS.
http://www.evans-tuning.com/forums/viewtopic.php?t=1559

Dyno and boost plot from Stock B16 GT28RS T3 .63 A/R at bottom
http://www.synapseturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=SM&Product_Code=syn-gar-012-01&Category_Code=turbos
Click to expand...
That makes more sense.. I was just like I really don't want something that dies at 5500 lol

I'm alright with boost tapering off towards redline I just didn't want to hit a Brock wall 1500rpms before the motors wound out

Now my question, stock ls block, what are my weakest links?

And will I have to many issues with low boost 250hp ish
 
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Muckman

Not a M0derator
It wont, nothing does. You cant take simple 1 phrase reviews at face value. Find the data first. Look at the boost plot.
 

Aussie

Zoom-Zoom
92lseg said:
On my mazdaspeed3 I had a hell of a time avoiding boost spikes because of the crappy internal gate..

But I guess it would save space and money.. And probably running at lower psi wouldn't be as bad
Click to expand...
My boost never spikes, the little ko4 is pretty bulletproof.

To add to the thread, as long as you run a large enough downpipe and exhaust you shouldn't have any problem with power falling off up till 7k
 
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