but but,... the customized exhaust manifold doesn't mean that welding won't fly off, right? Somemore it look longer, which same as contribute to turbo lag?
---------- Post added at 08:39 PM ---------- 6 hour anti-bump limit - Previous post was at 08:38 PM ----------
AS I know of, 4g93t-RS is twin blade while normal 4g93t is single blade.. Might be wrong info..
---------- Post added at 08:40 PM ---------- 6 hour anti-bump limit - Previous post was at 08:39 PM ----------
but ready made mostly very nipis compare to original one...
---------- Post added at 08:41 PM ---------- 6 hour anti-bump limit - Previous post was at 08:40 PM ----------
OMG... I was reading from page 1-7... Now i read this... faint.. I read about this article before, the next question that I asked is.. how big is big turbo, how small is consider as small boost? Sorry I'm kind of digit person.. hardly can stand an open statement..
Sorry for the mistake on the wastega thread...
Ok, first answer to your question...
The answer is NO. What I was trying to say is... Whe arc welding, there'll be fluxes that are not cleanable... However, the fluxes will fall off due to the extreme pressure and temperature within the manifold.. When, tubular manifold, those are TIG/ARGON welded. And the melting temperature of stainless steel is 1200ºC. Which will never be ur exhaust temperature...
Long runners also means lag... Yes.. But when u have a well designed with less restriction and all equivalent length runners, there are less turbulence and chances of exhaust from runner 1-4 goes into 2-3. A well designed manifold would create a siphonic effect on the flowing exhaust. Reduced back pressure....
My wastegate is on my manifold too... But I customize a flange and drill a hole on the manifold. Have the welding done along outline of the flange instead of having a pipe welded on the manifold.There's no exposed welding inside the manifold. So, no chances of welding byproduct(fluxes and loose welding) fall into the turbine and harm the fin.
Ok, back to the wastegate question. When u have higher boost, u'll need a smaller wastegate. Anything > 10psi or 70kPa is considered high boost. But most of our ppl on Malaysia will take 38mm even for low boost. THis is due to the price. But afterall, not so much effect on the road...
BIG or small turbo depends much relative to the engine. a TD04L is considered a small turbo for a an engine >1.8L capacity but it's consider big for kancil... It depends on the entire set up to justify wether the turbo is big or small relative to the engine capacity... It;s very hard to justify in numbers sometimes.... For example... How many bowl of rice eat each meal is consider alot. Some ppl takes 3 bowl also say ngam ngam aje,,, Some girls thinks 3 spoon is alot...
Hope my example shows u some rough idea on big and small turbo...
---------- Post added at 11:27 PM ---------- 6 hour anti-bump limit - Previous post was at 11:22 PM ----------
BTW... Even if u get branded tubular manifold from oversea with 3mm thickness Sch 20 stainless steel steampipe, it;s stilll prone to cracks on the welding joins... It's due to the high temperature flow and the force caused by the weight of the turbo...
A very well
known problem.