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Hey guys, I posted this on nissansil but i seem to find a lot more people using sau, a lot more mature readers to.

Basically went to get my s15 tuned today, sr20 standard bottom end all the fruit, high mount steam pipe manifold td06sl2 20g 10cm (kando in t2 platform) tial 38mm mvs gate.

Issue is, using a .6 bar spring, as it ramps it's ramping to about 1bar of boost then as it increases from 4grand to red line it boosts to around 18 psi.

My theories are - wastegate size could be to small but from everything i have read, there is no issues using a 38mm wastegate to control 18psi on a turbo of that size (very similar to a 3071r if your not familiar with mitsi ranges)

- wastegate is fingered or fake - did pull it apart, diaphram looks legit and paid quality money for it.

- position of wastegate on manifold isn't getting a decent amount of flow to the actual wastegate

- scrap car and buy an r35 gtr

sorry for the novel, help me sau!

here's a pic of the manifold i got made for an idea of what the gate position is like - doesn't look to bad to me

post-41783-0-17417900-1353507326_thumb.jpg

It should work, ish

Gate pipe positioning is not great, what is the transition like inside the manifold.

Imagaine how hard it is for poor old cylinders 1 and 4 trying to muscle through cylinders 2 and 3 to get out the screamer.

Can you just run 18 PSI? Or run the engine with no gate. I have seen 10 psi doing this on crappy manifolds.

As i'm running an auto I sometimes hit the limiter, so my tuner gave me a soft limit between 7 -7.5k. Every time I hit it my turbo overboosts to over 30psi.

Ethanol is your answer.

First, as other have said primary pipe 90deg to the gas flow is not ideal

Secondly, looks like the primary pipe for the gate is smaller than the v-band and then the screamer pipe is smaller than the v-band?

So while you have a 38mm gate, you are putting a restriction before and after the gate.

I would start by getting a bigger primary pipe and screamer pipe to actually the same size (or slightly larger) than the v-band

Edited by SimonR32

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