Is there any downside to running an intake restrictor plate to control a slight boost creep. Intake pipe is 2 1/2" ID, was thinking of 2" flange to keep boost @ 13psi, right now 15psi. T04E 57 .84 a/r p wheel, stock ports, 3" open exhaust, HKS 50 mm wastegate 11 psi spring. A high flow cat keeps me at 13-14psi however the car is track oriented (road race) and want to keep the exhaust open for flow and heat..Feed back welcome..

 

in my opinion its a bandaid fix, and cause an overall drop in output being that its giong to restrict airflow at any rpm

Try porting the hotside outlet, or upping to the next available a/r or something else. ill go get my books see if i can think of anything else

 

Thanks for the feedback...how would upping the hotside (1.00) help keep the boost pressure down? I would think it would flow more due to less restriction??

 

my thoughts are (and correct me if you think im wrong)

with the current setup your running, you are overspinning the compressor wheel. a larger hotside would alow you to flow more/the same exhaust volume with a slower turbine / compressor speed

i wouldnt jump to a 1.0 right away, id try to move up a little slower

 

I think clipping the turbine wheel would give the effect you speak of. I would think going down in hotside a/r would choke the max flow creating backpressure and slowing down the turbines ability to keep spinning faster.

 

clipping would work also, i have no personal experince in it but have read about it many times


A smaller a/r IE .7x would cause the turbine to spin faster at the same load/rpm than a larger a/r

picture blowing on a pinwheel though a straw. blow though the big straw and the wheel spins slightly, blow on it though a small straw and it spins much quicker

theres a paragraph on what i just mentioned and the turbo inlet restrictor in corky bell's 'Maximum Boost', however i cannot find my copy to accuratly quote it

-Jacob

 

Thats what they did in the 70s to control boost before using a w/g lol

I'd say not only switch to a 1.0 but goto a better manifold, let me guess u have an hks cast unit?

 

How does moving up in hot side a/r control boost creep? With respect to manifold. Feed (ss autochrome) copy..

 

Is you're w/g discharge rerouted back into the DP? If so post some pictures of how thats done.

 

Yes, about 20 inches from turbine, sorry no pics..

 

Yes, about 20 inches from turbine, sorry no pics..

 

Thats defineatly far enough out from the turbine, however are there any right angles in the dump tube?

 

No. maybe a 40 degree bend...