not even close to the same thing. lag is the inability of the engine to produce enough exhaust gas to create positive boost. read your first post, you claim there that it's caused by overboosting. how is that the same thing?

It's not and you both know he made a mistake. Just let it go

cuz when ur overboosting on the stock turbo (or smaller one) which is usually above 15 psi , the A/F ratio wont allow your engine to produce as much power and less power=less exhaust gas, and I would think it would cause lag as well. Which is why you bought stage one right? To make the A/F even. While you can notice spikes on your boost gauge and such the stage three stays constant, or at least thats what I hear on this forum. Is this right or is it called something else? I just figured it caused lag becuse it robs you of exhaust pressure to spin the turbo. I dunno you would know moreso then I would what its called PSI chick but please correct me now if im wrong. And i misused over boost in the first post instead of "more boost".

now i see what the confusion is. what you're talking about is simply exceeding the usable power of a turbo. each turbo has a compressor map that tells you the efficiency range of the turbo and the max power that it is able to produce. when you attempt to exceed these limits you start running into problems. basically what happens is that the turbo starts to choke itself, and you begin to lose power rather than produce it. you also run into issues with surging, high egt's, flutter, dangerous a/f's, and a bunch of other problems.

when i say "lag" i'm referring to the other end of the cycle, the beginning spool. lag is simply the time that it takes the turbo to spool enough to produce positive boost. smaller turbos spool faster and produce less lag. the bigger the turbo, the longer it's going to take to completly spool and produce power. the stock turbo fully spools at like 2200rpms, the s3 turbo spools around 2600rpms, a 50 trim more like 3000rpms. at each of these rpm levels, that is where the turbo is spinning fast enough to actually produce boost. before these points the system is in vacuum.

if you want more info, try howstuffworks.com, or there is a very good write up about compressor maps and how to calculate usable power that was written by an@psi-fi. his write up doesn't go into lag or the effects of exceeding the map, but it gives you an idea of how to figure out the best size turbo for a certain application.

Lag and spool up are two different things all together...and bigger turbos usually always take longer to spool up...Lag is caused by too much boost rather and in a front wheel drive car the overboosting <correction: (more BOOST) can be an advantage since in 2nd through fifth is direct power even if you lose it in first but you will have less burn outs and such in first so that helps more then harms. So if he drags it I bet it will do better then most people think.

<where i misused.

Thank you PSI chick ......

hey keep the info comin you people are teaching me new things.........and all he really does is drag......street races (RARE) since theres only a select few cars like the evo8 some sti's and this one insane twinturbo R32 to compete with him...

Like what info??????? PSI chick could point you to a good source but You can check out HOWSTUFFWORKS.COM its not as detailed as most but it will get you started. THERE was a page i found a long time ago that was really detailed as part of an online encyclopedia that got really detailed and a lot off stuff was proofed and added by GARETT turbo affiliates and all other areas of science and such its really interesting ill have to find the link.

psi i thought the stg3 turbo titanium construction that it would be able to maintain stock spool up and if lag is increased did it help traction issues at all.