![]() What are the major benefits besides correcting the pre-spool timing problems with an open exhaust.With a fully open exhaust and an upgraded intake and IC it is even less of a concern than above.With a fully open exhaust it is not a concern.If the main cat is in place and the pre-cat is replaced with a downpipe, and the engine is *mildly* street ported, stock IC (or upgraded IC) and upgraded intake, stock cat back (or upgraded), the lag will not be a major concern except for the hard core Auto-X racer (who should have a fully open exhaust at this point anyway).If the exhaust is otherwise bone stock, then yes there will be considerable turbo lag.Some say there will be excessive turbo lag with a NS system.Is this true?.With the above mods you will need to enlarge your wastegate anyway which is trivial to do while the turbos are apart for the NS conversion.Add an aftermarket intake and a larger intercooler and the prespool timing problems will increase.If you are running an aftermarket boost controller it will most likely not be designed to also control the turbo pre-control gate which can and will quickly cause excessive wear to your transmission and drivetrain.If you have replaced your pre-cat with a downpipe and your main cat with a mid pipe, the pre-spool timing of the stock system will be off due to faster turbo spool up.If your car is bone stock you probably do not want to convert it.Why would I want to convert my sequential twin turbo over to a non-sequential twin turbo?.The following is from Trev Dagley's former web site, which I inherited. Non-sequential How-to (Trev's Non-Sequential Conversion).Non-Sequential Turbo Conversion Last updated: September 13, 2002
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