Not sure what section to post this in. I have been doing a lot of reading about full non-sequential and it seems that a lot of people regret doing it because of the lag. My question is how does the lag of a non-sequential set up with stock twins compare to lag of a single turbo rx-7? I know there are many variables but I am looking for a general answer. For comparison sake lets assume we are talking about a single turbo kit that is more on the mild side (I.E not a huge single).

Thanks

 

turbo lag of a single depends on the hotside of the turbo. smaller equals less lag.
ic size and length of ic pipe also will add 2 turbo lag. fmic will generally have more lag then a stock or v-mount setup....do to the distance the charged air has to travel to reach the intake.

not 2 sure how much lag is gained by doing a non-seq. setup but i would suspect it would be minimal do to the fast spooling characteristics of the tiny twin turbos

Big turbo= more spool up time

 

That would have been my guess but from reading some posts it makes it sound like the lag from going non-sequential is unbearable.

 

i have driven one non-seq fd and the lag wasnt bad @ all. IMO
mind u it did have the 99 spec twins.
i would suspect anyone that had unbearable lag had other issues causing it

 

99 spec twins wont make any difference in power, lag etc...

 

I dont regret going non-seq, but i sure as hell miss the fast spool of the sequential system... but in the long run it will be easier when i go single, plus my engine bay is cleaner.

 

yeah.......more likely due to the streetport
porting will definetly help cut down on lag of any turbo

 

It's not just having a streetport done; you need to have a full exhaust, and some people don't want to deal with the noise and smell of a MP.

 

how can something that sounds so good be considered noise.
gotta love that rotary smell 2..
granted it you want the restrictive power of a choked back rotary that is your choice. dont think that is what this thread is about though?

 

I have an aftermarket SMIC, Downpipe, Midpipe with highflow cat, catback. Still trying to decide whether or not to go non-sequetial. Juts tired of dealing with issues that come up with the sequential system when running higher than stock boost levels.

 

Non-seq. is not bad. I had bull boost at 3-3.5k. I think it's fun to drive. Plus, you should get better gas mileage because non-spirited driving keeps your rpms below 3k.

 

Well, let's see, the OP is asking about lag with NS, but he's got a hi-flow. It won't matter if you have "99-spec twins" or a streetport, your lag with NS is going to be much higher without a straight exhaust.
No reason to get into a mud-slinging match about the smell and noise of a full exhaust, it's been done to death...

 

^touche

 

I have a stock-port motor with mods listed below on NS twins, and it spools VERY quickly...

 

non sequential FTW.. i hated going into boost constantly in the lower rpms.. i live in a "hilly" city.

1)it makes city driving more bearable.

2)cleans up the engine bay somewhat.

3)and i love the violent acceleration when boooost kicks in..

4)sounds louder and meaner

5) gas mileage imroved slightly


although it sounded cool everytime the turbos started to spool around 1800rpms..

 

Well guys, now you are going off topic. This thread is about NS vs. single lag, not NS vs. sequential. The latter subject has been beaten to death...