The Poor Mans Non-Sequential Setup

[Carl]

Good to see that you are sorting the car now Rixio.
Did you get that broken stud off that you broke when trying to remove the Y pipe?(Which does not need removing for the conversion)
Regards
Carl

[dryvern]

This has peaked my curiosity.
I am wondering if this non sequential process is likely or not to balance out the output of my twins - fully rebuilt 2001 turbos.

The problem I have is my first turbo on low boost produces around 6.5 bar the second 9.5 bar. On high boost the first turbo reaches for 8.5 bar but the second then goes to 1.1.
Having recently had to rebuild I really do not wish to go over 1bar, on low the first turbo weakness is annoying, especially after watching walet shrink drastically tuning & retuning.

I guess they would run nonsequential at their natural boost. I.e. no balance on output.

Funny thing though before all this tuning madness started (with a flutter on the second turbo on my old origional 1993 turbos) is that the car ran 299 wbhp & very well with no mods (car being as I got it, a standard \'93 type R Jap import) i.e. standard o.8 bar on both. In fixing the flutter 1/2 a year after getting it, the pipe/nest set up was \'\'set back to how it should be..correct, safe\'\' although unchanged by me it aparently had bypassed - a solenoid??
Anyway the result was I dropped 50bhp & got noticably slow. 6 weeks after the quickly arranged fuel & power FC upgrade the engine blew (still being under the origional power)...hindsight a thankfully found faulty air sensor.

The point of this funny thing....boost pipe & rats nest configuration does have an effect & I still wonder that the Japs perhaps know a lot more about this than us. Certainly more than me.

Not all understand my liking twins over single (due to how well the FD origionally ran, which perhaps I have lost the feeling of down the tuning road...a bit). Ideally I would like an even boost between 0.9 & 1 bar with my set up....I guess we cannot have all we want. An annoying chase game....oh well.

This idea though intreagues me...perhaps enough...you can see why.

[DR SCHNITZEL]

non sequential has its ups and down, you will have a really sluggish car around town unless your past 4000rpm
 
sequential is very scary if your on the limit in a corner and then the 2nd turbo kicks in. it can really upset the balance of the car. and nearly throw you off a motorway bridge at 60mph

[DR SCHNITZEL]

9.5 bar is alot i was making 350fwhp at .8 bar

[BlitzBoy]

sequential is very scary if your on the limit in a corner and then the 2nd turbo kicks in. it can really upset the balance of the car. and nearly throw you off a motorway bridge at 60mph

Disagree means you are not in the correct gear for the corner if you are driving on the limit,

if you are driving fast around a corner and in a high gear and low rpm you are not driving the car fast correctly, you should be in a lower gear using higher rpm. (You will be well past the transition point of the second turbo as well)

[dryvern]

Yep, it\'s like keeping a large turbo in it\'s boost range of RPM. Know where your power sits.

[needham]

hi guys wondered if u can help me out, i just finished changing to non seq and have no boost, the gague reads minus but stops at 0 and seem to have light blue puffs of smoke when i blip the throttle:( not sure whats goin on, but have one question the pre control solinoid is that on the right or the left,,,,
 
my car has the following setup
polished ports ( 4k on new engine and standard new turbos)
apexi and remap
exhaust.



not sure if u guys  can help me but all tries would be greatful lol

[interloper393]

make sure you have non-seq setup on the apexi sounds like the hoses are maybe on the wrong bits?

[BlitzBoy]

Sounds like the wastegate door is stuck open so check actuator arm and hoses as said.
lol there is nothing to change on the Apexi to say "hi I am no sequential" lol
There is a function tick box enabling the Seqential operation of the solenoids but unticking this wont cause the non sequential operation not to work lol
It will need remapping to make non seq to work effectively

[needham]

cheers mate, went to reworxs today to buy loads of solinoids and silicone hosing to redo the rats nest so just gonna put it back and do the nest at the same time, oh and the injectors wha haa haa lol lol

[Philo]

I am finding it hard justifying using the rex on long journeys to my good lady who pays for half the petrol.  We only managed 17.5 mpg in my standard car on the last trip.

Having done a little reading I have been considering a non-sequential turbo conversion.

But how much cheaper is it? What sort of mpg are those of you who can drive up to 4000 rpm without using turbos getting?

How far do I have do drive before the conversion pays for itself?

[cyman]

I am finding it hard justifying using the rex on long journeys to my good lady who pays for half the petrol. We only managed 17.5 mpg in my standard car on the last trip.
 
Having done a little reading I have been considering a non-sequential turbo conversion.
 
But how much cheaper is it? What sort of mpg are those of you who can drive up to 4000 rpm without using turbos getting?
 
How far do I have do drive before the conversion pays for itself?

i am non sequential and am def get low to mid 20\'s mpg and that is an average of all kinds of driving. my turbos come on strong from around 3500rpm and running around town or short trips off turbo is a nice smooth drive just like any other car but when you hit the loud peddle it goes like a rocket i am runnin .75 bar with 369 fwhp or 309bhp at the wheels.
 
si

[BlitzBoy]

How far do I have do drive before the conversion pays for itself?

you may get an extra 2-3 miles a gallon, therefore you might get an extra 20 miles per tank, so you save £5 on every fill up, depends how ofthen you fill up?, say once a week so £20 a month, £240 a year, so if you a got a tuner to do it it will cost you around £300 or do it yourself if you are able. So it will take a year, IMO not worth it in losing the low down power advantage and a hot hatch beating you around town

[cyman]

you may get an extra 2-3 miles a gallon, therefore you might get an extra 20 miles per tank, so you save £5 on every fill up, depends how ofthen you fill up?, say once a week so £20 a month, £240 a year, so if you a got a tuner to do it it will cost you around £300 or do it yourself if you are able. So it will take a year, IMO not worth it in losing the low down power advantage and a hot hatch beating you around town

from my personal experience driving round town is fine a hot hatch doesnt stand a chance (and would you want to race one around a town anyway?). the actual increase in smooth driving before the turbos come in makes for a very nice drive and if your car is setup right as soon as you put your foot down it pulls, it hits 3k pulls harder, hits 3500k goes like a rocket. considering normal revs for driving round town is around 3k for a nice smooth ride the power is just waiting for you.
 
and as far as money saving is concerned i thought a tank holds around 15 1/2 gallons if you go on filling up with 14 gallons on a normal fill up if you get 2-3 miles a gallon better fuel economy then that means 28-42 miles more per fill up or for the sake of argument closer to £7- £10 saving per fill up so if its a fill up a week thats £364-£540 saving a year.
 
yes i may be biased because i have non seq setup and am extremly happy with it with petrol going up all the time the extra savings in a year are just a bonus i love the nice gentle cruising capability off turbo(if its a sunny sunday caught in the traffic :chat ) with the strong way the turbos kick in whenever you fancy putting the boot in (for when you overtake all of them :Laugh )
 
si

[BlitzBoy]

lol all this talk about saving money on fuel, guys we own a mini supercar!!!! if you want to save money on fuel you are in the wrong car!! do what a lot a people do and buy your self a £500 cheap runaround if you do loads of miles.
PS A seq vs a non seq, the seq will be faster in most scenarios if they met each other on the road