hulk xr6t Member 160 Member For: 17y 2m 11d Posted 08/04/08 11:36 PM Share Posted 08/04/08 11:36 PM Hi,I have XR6T with 300+rwkw and 4speed auto with 2800rpm stall converter.When the car is on boost its awesome...But from a set of lights, without any stalling of the converter and just a flat shove of the throttle its pretty average off the line until it hits boost and then the tyres are frying (about 2 seconds of lag)Also when cruising, and you put the foot to the floor it has about a two second delay before all the boost floods the engine and it screams away. It still pulls off boost but nowhere near the ferocity of the boost.What can be done to counter the off boost laggy performance?I thought diff gears maybe go to a 3.73 or 4.11 but others have said this will reduce load on the turbo when its on boost and the turbo wont spool up as hard. As a result I may actually lose overall performance by fiddling with diff gears???Any ideas or is this lag characteristic just part of owning a XR6T?? Link to comment Share on other sites More sharing options...
jsmith Donating Members 712 Member For: 17y 2m 3d Gender: Male Location: Blacktown Posted 08/04/08 11:41 PM Share Posted 08/04/08 11:41 PM turbo lag is just a characteristic of a turbo motor full stop. About the only way to lessen the lag would be to fit a turbo with smaller turbine housing but this will hurt not only peak power but also power high in the rev range. Just learn to deal with the lag Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 17y 10m 20d Gender: Male Location: SW Sydney Posted 08/04/08 11:41 PM Share Posted 08/04/08 11:41 PM What intake and exhaust mods have you got? With better flowing intake and exhaust, you can get the turbo to spool faster and reduse the lag. Also what you have to remember is that you are now used to the increased on-boost performance of your car, so its not exactly "slow" as such, just more like stock until the boost goes past 5-6psi!Tell us more about your set-up and we should be able to point you in the right direction, or speak to your tuner! Link to comment Share on other sites More sharing options...
Fat-Tony Member 5,364 Member For: 18y 9m 6d Posted 09/04/08 12:05 AM Share Posted 09/04/08 12:05 AM Ahhhh buy a v8 and put a positive displacement charger on it if the lag is a problem. Link to comment Share on other sites More sharing options...
Dillz Three pedals are better then two.. Donating Members 15,637 Member For: 17y 7m 1d Gender: Male Location: Melbourne Posted 09/04/08 12:16 AM Share Posted 09/04/08 12:16 AM Less piping (amongst other things) less lag. But it will always be there.that's why I love turbo's you have to actually drive them, not just plant your foot and the most power/torque wins. Link to comment Share on other sites More sharing options...
hulk xr6t Member 160 Member For: 17y 2m 11d Posted 09/04/08 02:02 AM Author Share Posted 09/04/08 02:02 AM Car mods as follows..K&N Panel filter and Typhoon second intakePlazmaman piping kit, just replace standard tubes3 inch stainless exhaust system, bigger cat. 3 inch dump pipe60pound siemens injectorsupgraded valve springsBosch 044 fuel pump and standard intank pump12psi actuatorPWR IntercoolerCustom tuned, boost flat at 14psi4 speed auto, trans cooler and 2800rpm converter...307rwkwLike I said its very smart on boost and feels like a stock six (or maybe worse) off boost.No complaints when it comes on boost though..... Link to comment Share on other sites More sharing options...
hulk xr6t Member 160 Member For: 17y 2m 11d Posted 09/04/08 02:04 AM Author Share Posted 09/04/08 02:04 AM (edited) My dad took it for a spin and drives like an old man (ie no boost) he says its nothing special. Edited 09/04/08 02:05 AM by hulk xr6t Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 17y 10m 20d Gender: Male Location: SW Sydney Posted 09/04/08 02:10 AM Share Posted 09/04/08 02:10 AM mate if you change the pipe work to be a POD off turbo style intake, it will spool up. Replace ment pipes are good, but there is still the same amount of piping as the stock system, if you shorten the inlet track, the response will improve Link to comment Share on other sites More sharing options...
XRDOSE BIGRED Donating Members 1,410 Member For: 17y 9m 4d Gender: Male Location: Sth East Melb Posted 09/04/08 02:34 AM Share Posted 09/04/08 02:34 AM if lag is really a problem get your battery relocated and have a 4inch pipe off the turbo with a pod filter sittin in an alloy box where the battery is meant to be....that should help increase spool and reduce lag....have a look at RAP1DS stuff. Link to comment Share on other sites More sharing options...
XR06T Silver Donating Members 4,146 Member For: 19y 6m 4d Gender: Male Posted 09/04/08 03:58 AM Share Posted 09/04/08 03:58 AM is a 4.11 diff really going to reduce the load on the turbo by a noticeable amount? at the end of the day it is still a 1700kg car, your gonna get some load whether you want it or not I would have thought! Link to comment Share on other sites More sharing options...
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