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Message: <blockquote data-quote="amel666" data-source="post: 3847123" data-attributes="member: 64044">I think u should not hav any problems if wanna boost 1bar IF all d groundwork is done. I had no problem boosting @ 1.1bar On my previous gsr setup..-1.5mm MLS head gasket-banana manifold-tial 38mm w/gate-works man boost con-stok 390cc inj-walbro pump-eMange bluThe hp/torq figures are not dat impresive but the power is smooth frm 3k all the way to redline 7.5krpm. And the boost is maintain at 1.1bar consistently, no boost drop.Maybe its the Tial doing wat it does best..But for td04, i dont think boosting more than 1.1/1.2bar is effective nor efficient. As the turbo is maxed out around 1.2bar. On the road, i didnt feel any difference in pulling G's/top speed. As for the engine internals, its safe to say dat they can support the pressure ratio.. just as long as ur engines healthy & ur fueling system is up to d task.Even though i've upgraded to a bigger turbine, still boosting @ 1.1bar.. d internals hav withstand d punishment well - at least so far. Another opinion is maybe to upgrade/enhance on d other part of the 4g93t while retaining d tdo4. Anything thats bolt-on.. intake/exhaust mod, cam/crank pulleys, cams, etc. Once u feel the turbo cant give u what u crave anymore than u can consider swapping to bigger turbines. At least the basic mods is completed. <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/driver.gif"  class="smilie" loading="lazy" alt=":driver:" title="Driver    :driver:" data-shortname=":driver:" />As for why the same boost pressure from td04 & td05 generate different results is bcoz tdo5 has larger compressor housing/fin than td04. So a 1bar of boost frm td05 could push a larger amount of air into the injen. despite the intake/t.body restrictions, d turbine would still push larger volume of air than a td04 would.My 2 cents.. :cheers:</blockquote>

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