Single turbos. An "I know nothing" question!

[RedM]

As I understand it, a single gives a huge power hike. This hike comes with an amount of lag and that hinders low speed/low rev acceleration. How am I doing so far?

 

Now, what I want to know is this. Can you get a single that delivers that power earlier at the expense of top speed. So, instead of boosting at 3500 to 4000 rpm is it possible to get one that starts boosting from, say, 2000 to 3000 rpm WITH the same amount of power as typical singles?

 

I'm not likely to ever want to go over 150 but I'd love big single power at normal driving speeds just much faster to delivery.

 

Does that make sense and is it possible?

[Thorin]

Well a T57 is probably in that spool range but probably wouldn't produce that much more power than BPU.

 

edit: even a 61 which produces full boost by around 3500 will still get positive boost well before that. A 57 would, I'm guessing make full boost at about 3000.

[JamesG]

Now, what I want to know is this. Can you get a single that delivers that power earlier at the expense of top speed. So, instead of boosting at 3500 to 4000 rpm is it possible to get one that starts boosting from, say, 2000 to 3000 rpm WITH the same amount of power as typical singles?

 

No, the performance of the turbo is unrelated to car speed. The compromise is fast spooling or big power. Obviously, as technology progresses you will improve both.

[bromy]

I am pretty sure Terrys T61 DBB is on full song by 3000

[paul mac]

do a search mate there is s**t loads about this

[RedM]

I did. Possibly a bit too much. I was hoping for a distilled essence of all the single threads.

[TrickTT]

Any move to a big single will decrease low speed drivability IMHO, thats why Mr T went to all the trouble of the twin turbo setup. if you want low end power, get a supercharger or stay stock

[Branners]

with single turbos theres a certain amount of performance based on the model. A t57 will spool earlier than a t67 but will run out of puff at the top end where a t67 will provide more power but will spool later.

 

If you have a manual car you can drive round the lag (assuming the clutch can take it), in an auto its not so easy. On a stock auto a t-61 would be the most you could bear to live with, drop in a high stall and that changes.

 

People to talk to about this are CJ (owned a t-67 on high stall auto I believe), Terry S (t-61 dual ball bearing on 6 speed), Ian C (t-67 on manual now going t-67 DBB) and Burt (t-61 on auto I believe).

 

Those are just the ones I can think of from the top of my head. Dude used to run a t-71 on an uprated autobox and did quite well, but some of that may have been down to his dukes of hazard approach to driving.

 

JB

[jason m]

Dude used to run a t-71 on an uprated autobox and did quite well, but some of that may have been down to his dukes of hazard approach to driving

 

[SteveL]

I recently went for a PHR stage 1+ ( which obiwan on here supplies ).

The spool is very quick ( as will I'm sure be the same for all others running the 'smaller' singles ) - I've found myself still anticipating the first turbo spool, but thats only for about 500rpm.

Whats more of a change for me was going from 1 decat to both decats and single at the same time - the noise difference is significant if your daily driving.

 

Big prob is trying to choose - take your time and get the money figures right.

I'm probably not the only one to have spent a lot more than originally anticipated.

But, and its a big but the grin factor is awesome....

[Ian C]

There are some funky graphs and things here that will give you the best idea of how a single turbo behaves on the road short of actually driving one

 

It's a load of tests starting at 2000rpm. Take it as read that if you are at 4000rpm or higher when you plant your right fooot, you'll not notice any lag

 

-Ian