smog-guy707

iTrader: (11)

is the whole purpose of a single turbo more power or is it also more reliable... everyone keeps tellin me to do a single turbo swap but i love the way sequential feels cuz its my daily driver

what so great about it?

1QWIK7

iTrader: (33)

Single frees up alot of engine bay room.

Its also less problematic than the nightmare seq setup.

You may love the seq now but when something goes wrong, good luck going through the maze of finding whats wrong.

With the single, you can eliminate that whole rubik's cube lol

Not to mention you get more power.

Busted7

+2 But i would add if done properly then its better in every way except emissions.

4CN A1R

iTrader: (6)

single seems nice and everything, but i heard the lag bothers alot of people. if you dd you fd, i would not sugest going single. it would prolong your engine and turbo since you are not running at such high rpm all the time but it will seem like you have very little power. i rode in a 476whp single turbo fd and i could not feel any pull...? maybe i was focused on how loud it was, idk. but i am all for the seq system, its very unique

skir2222

Depends on turbo size, when I had a t04r I didn't notice any lag problems. You could run whatever the wastegate is set to if your worried about engine life. I DD my t04r for about 8months with no problems, boost hit around 3k rpm, plenty of power all around. Only benefit with the twins on seq. was instant power. Most people go single to have more power and free up some engine bay room. My car was around 400hp and it really moved! Traction was def a problem till 3rd gear, in a 476whp 7 I would imagine it would get to whatever speed you want really fast!

Busted7

Lag is dependent on the size of the turbo. Ive had both and my set up feels smoother and more linier than the twins. It runs cooler and gets the same fuel milage as before when not getting on it. And if you didnt feel the pull in a 472 h/p fd something dosent sound right. Done correctly and not driven any diffrently it should be depenable. Not trying to say your wrong just stating my first hand opinion on an fd ive had for over 5 years.

cewrx7r1

iTrader: (2)

Some of you need to be spending some time in the "single turbo" forum.

GT35R with a .82 AR hot side will produce more power with less back pressure and rev like seq twins. A winner in all aspects over the twins.

Passing emmissions is only a problem if the car has to look stock. My light ported GT35R with 1.06 AR hot side will pass TX dyno emmissions with the cat in the car and lightly leaned out map, but then I also have the stock air pump still on the engine and I tune my own engine.

Max13BREW

I love the twins, and think for a daily driver they are brilliant. Smooth power, reliable if maintained properly (Take it to a mechanic..not some gronk who pretends to be a mechanic)

However, when you boost the twins beyond 20% extra power they start to make less sense..

Upgrading to BNR's or an equivalent will keep the toy much more reliable, and will produce a bit more power (Not significantly more than stock..but much much more reliable at higher boost levels.)

Simple maths is the way to look at it all
Stock twins..power from 2500-6500 with a 400rpm lag hole in the middle
BNR twins power from 2800rpm - 7500rpm with 500rpm lag hole in the middle

Boosted twins from 2500/2800 --> 6800-7800 rpm with much larger lag hole in the middle!!

So effectively 5000rpm useable power with a 500+rpm lag hole..meaning 4500rpm useable power..

Singles...
GT35R 3000rpm-8500rpm useable...(Thats 5500rpm useable!)
HKS T51R 4000rpm - 9000rpm useable (Thats 5000rpm useable!)

**Above are not definitive numbers..and I won't take offense if someone wishes to correct the numbers..its only a rough guide**

Then look at other factors..eg..smoothness..lack of lag hole when boosted..(Lag hole on a boosted set of twins gives 80+HP loss of power...enough to throw the car sideways halfway round a corner!)

Then look at ease of installation, cost, maintenance, etc..Consider things such as backpressure on engine (The stock twins are pretty hopeless in this area..and the BNRs only slightly better..)

Lots of points to juggle around....everyone is different. I spent 2 years deciding between BNR3's and a big single. (I would choose the twins over a smaller single..for similar power outputs the sequential setups are very nice, however once you start pushing the envelope the single wins hands down)

More things to consider are fuel / emissions etc... If you cant run 25+psi there is no reason to get a large single..(Why run a single below its efficiency curve? Choose the right size wheel for your needs!)

As I mentioned already..everyones needs are different. Have a chat to your tuner / engine builder...discuss your needs, be HONEST about your budget (My setup will end up costing around 35k US$), and dont cut corners as you will pay for it tenfold.

skir2222

This should just get moved over to the single forum, it better suits this thread. Also would get more hits/posts from the right people!

jbust

iTrader: (16)

as everyone said, If you build it right it wouldnt hunt you in the future. I like how the twins was set-up but the headache of troubleshooting when something goes wrong.. I went single last year and there is no lag at all on the RX6B or either my buddy's t04r. Im really enjoying this streetcar alot

jdhuegel1

Those people either just went for huge HP or didn't know what they were doing. Both my TO4R and my T78 would make you **** your pants.

Please don't make assumptions. Single is just as (if not more) reliable. Troubleshooting is far easier and the system is much more simple. Whats this nonsense about prolonging your engine? High RPM? If you're not bouncing off the rev-limiter you're fine. Even then... And I have NO clue what this "no power" crap is all about.

No freaking way. My FDs made that and more - and they were insane. The guy you rode with was lying, or spinning the tires off.


I like the stock sequential system - but I wouldn't call it unique... Complex maybe.

Northern7

iTrader: (1)

nice thread, I have rode in a gt35 with 420 whp and bnr stage 3 with around 350. I liked the curve of the single. I understand that there is alot of hp difference between the two cars, but the feel is VERY different.

JHew84

iTrader: (9)

I agree with jdhuegel1, I'd prefer a single'd FD over a sequential'd for ease of repairs alone. A big reason why I'm going single (GT35R) has to do with making diagnostics and repairs easier. I just got done pulling all the selenoids out from under the manifold, a friend of mine looked over at it and the only thing he could say is "that gives me a headache" ...

4CN A1R

iTrader: (6)

i dont meen to be rude, by why do you have to pick apart everything i say?? as i noticed from some of you previous posts in other threads, you try to slander facts and opinions. and then you make up your own assumption with no backing behind it. i shouldn't have to explain myself, but i will, just so everyone knows where i'm comming from.

and i dont know if you noticed or not, but he asked for opinions. i wanted to give mine because i knew there would be alot of single turbo bias.


i was considering going single at one point and "dave" at KDR told me he does not sugest it. most people who go single, do it for the power. why would you go single if you didnt have to?? 4-6k for a new turbo, fuel system, tune, and labor. not very sensible if your current system runs fine.

if he is daily driving his fd with a large single, hes not going to be constantly boosting. even though boost overall is not wat harms the engine. boost/fuel related problems, wont be as much an issue. i should have said prolonging you engine components, you prob would have understood better...

no power-meaning...turbo lag. i am guessing you have never driven an fd without boost? its like driving a civic si.

it was ligit, i watched his speedo. it was shawn keeblys fd.

please tell me how many other cars have a sequential twin turbo setup??

Upgrayedd

iTrader: (1)

I'm only aware of the new 3 series BMW's, the Cosmo, and the Supra... But being complex would be my assumption of why it isn't widely used... Because it is very complex... Especially on the FD with all the damn vacuum lines and solenoids...

A single turbo is definitely an easier system to troubleshoot. And if you do your research you really can find a turbo that can produce good power, and at the same time have minimal lag. As with most modifications, it's an issue of preference or goals. Another option would be to go with non-sequential twins (tock or BNR upgrade). But imo if you're gonna do that you might as well go with a quick spooling single. It should eliminate some headaches for you. I think your best plan of attack is to figure out what your goal is for this car as far as use and driveability, and then weigh your options.

4CN A1R

iTrader: (6)

i new the 86-88 porsche 959 had the sequentual setup, but i thought that was it. i never heard of the cosmo, and i thought the supra's were non-sequentual. we dont have any 5th gen supra's where i live

thats mainly wat i was trying to get at. i didnt mean for it to be a debate

Slimbo

I believe the old Subaru Liberty/Legacy B4 and the R32/R33/R34 GT-R's all have sequential twin turbo setups.

matty

i love the seq system as well but as someone else pointed out you can get a single turbo setup that doesnt lag much.

skir2222

5th gen supra?

Upgrayedd

iTrader: (1)

The Cosmo I refer to is a 20b powered Mazda coupe fromt he early 90s. I forgot Porsche does have some cars with sequential setups as well... Can't forget about those. And yes they did make a sequential set-up for the Skyline as well... And there are some guys making custom sequential twin turbo set-ups for the Cummins turbo diesels.

The second part of my post was directed towards the OP, so I hope you didn't think I was attacking you in any way or tryin to be rude...

Busted7

I would not attempt to tell anyone what to do thats there choise but im just stateing my experience with my car. And i dont think a turbonetic's 62-1 is a large single, i would say middle of the road. Its taken alot of time and money but the car is easier to work on and very reliable plus runs 10.80's with a/c power steering and cruse.

4CN A1R

iTrader: (6)

no, actually thought you were backing up wat i said in my second post...

i will have to do a little research into the Subaru Liberty/Legacy B4 and the R32/R33/R34 GT-R's having the seq. setup. i am pretty sure they dont, but i'll make sure

4CN A1R

iTrader: (6)

i meant 4th, i counted wrong.

i'm really off today

Slimbo

Liberty-
http://autospeed.com/cms/article.html?&A=1229

Skyline- my mistake, they run in parallel

ryan2153

if you like the feels of the sequential just get a dual stage boost controller and it will feel just about the same. As far as the single or twin goes i am personally planning to do a couple smaller twins (larger than stock but still small) I hate waiting for my power so i want the threshold to be as low as possible. I'll let you know how it turns out when im done but it will be a little while down the road due to funding. Best of luck to you though, hope you end up going with the twins since its the road less traveled. post things as you make progress on w/e you end up doing.