So im not sure exactly if this is my problem or not.. just looking for feedback

When i floor my car in third and slam it to 4th.. theres about a second delay before my turbo spools back up.. same goes with from shifting from 4th to 5th.

does this sound like drive by wire lag?

im running a 16g turbo which is too small really for just turbolag.

I just wanna make sure i buy the right part to fix it before i purchase anything

 

i know exactly what you are talking about and its slightly annoying, im running an evo III 16g. im pretty sure its just the turbo spooling back up.

 

could be a combination of DBW lag and maybe fueling, sometimes if you're a lil rich with sudden push on throttle it creates a lil lag.. turbo lag should be least factor for that turbo unless you let the rpm drop too low before shifting

 

^^ i agree....that turbo should be spooling fairly quickly

 

yeah its an Evo III big 16g turbo. I dont think its turbo lag because its a small turbo..

and i have a great tune done by Paul from Dezod..

i think that its Drive by wire and either a drive by wire controller or a WOT box would fix.. im just not sure which to buy.

 

what happened to the cable conversion few have done ??

 

i dont know anything about it?

 

There is no such thing as Drive-by-Wire lag. Instead, the issue you experience has to do with the setup of your turbo system.

Going by your symptoms, I am 100% confident that you have the MAF before the turbo inlet and are also using a BOV. Whenever you shift, causing the BOV to open, you are dumping measured air out of the system. This is air that the ECU is expecting to be there and which is why the car falls flat on it's face between shifts at WOT.

How do you fix it? Place the MAF after the BOV, or do it right... use a BPV/DV.

*EDIT* Read this thread for more information.

 

or a little wot box haha

 

It's always better to truly fix an issue than to band-aid it.

 

He never had an issue before, which if it was due to the bov he would have seen this issue immediatley. ps. If you noticed he was tuned by PAUL from dezod, he def. would have addressed these issues while he was tuning.

 

im back to stock so i have experianced lag from turbo and lag from dbw...ther is lag with the dbw. tuning helps to a point when using an engine managment system but being stock you notice it exp if you own a cable car and dbw. Iv switched between the two often (one for work and one for play) ther is a difference.

now your right about the bov though, it can make that lag even worse but the main thing is tuning.

 

There is actually such a thing as drive by wire lag. Toyotas often have this problem and so do alot of nissans.

This is why they make drive- by wire controllers to eliminate that lag.. however the contorllers are more expensive than i really want to spend.. thats why i want to be 100% sure it is my problem.

 

Its the DBW for sure, I hate DBW but pretty much every new car has it, I miss the cable throttle on my old celica gt-t sometimes, but such is life, haven't felt like dropping the $400 on the controller unit yet though

 

I experience the DBW lag. My old 92 colt with a 4g had no lag running an 18g turbo. I feel the lag in the scion rolling around all stock. when racing it stock going from second to third you can feel it lag the worst.

 

And there is no need to by a controller, it is a waste of money. I've performed plenty of tests, analyzed data logs, followed the control strategy of ECUs, and compared dyno runs in a controlled environment... it is already running as efficient as possible. OEMs spend a lot of time and money to get it spot-on and there is nothing you can do to make it react quicker without effecting efficiency (and thus HP).

Again... recirculate the BOV, install a BPV/DV, or place the MAF after the BOV. If you are already doing one of these three things then clean the BOV and lubricate the piston. That's the issue, not mysterious "DBW lag."

 

Not to come flat out and call you a liar, but there is such thing as DBW lag especially on the TCs, yes the OEM setting is efficient for gas mileage because that is what its deisgned for, it is not designed for performance and fast response times. I have see and felt the difference between a stock throttle control on dbw and throttle control on dbw with a control unit, there is a significant difference in the powerband, more torque being the most noticable. I've seen this improvement on both a tc and a civic si, it was huge

 

How have you seen the difference?

Show me an improvement in 1/4 trap speed where the only difference in modifications to the vehicle is a DBW controller. Show me dynos. Show me data logs showing: requested throttle input (percentage), actual throttle body opening (percentage), calculated load, actual load, and power. At my former employer I did a great deal of research on this on ME7, ME9, and MED17.5 ECUs with Tiptronic, DSG, and Manual transmissions. On actual road tests and an environmentally controlled dyno the only result was a net loss in efficiency and power across the power band when actually modifying the behaviour of the throttle input to actual throttle body operation.

Butt dyno's honestly don't prove anything, and everyone's butt is calibrated differently.

 

I don't have dyno sheets this is strictly from driving the cars themselves, with the controller they drove with zero lag like I was driving a cable driven throttle body, you gas it it goes, with my tc you gas it and there is atleast a 2sec delay in the reaction

 

the only way to "prove" to you that lag exist is to have a datalog of a tc n/a stock with dbw and then convert it cable and do a log that way...im sorry but im not about to spend that kinda molla to prove a point nor do i have the money in the first place...but i do have a crap load of logs from many diff Tcs that run the fic and i can show you the diff there...you can see the voltage to the tb and how long it takes to get to full voltage then possible to compair to a cable car of an older car but still the variance between the two vehicles will raise other arguments. if you would like ill send you a log that shows the throttle position.