Twin Turbo Or Big Single????

[ludi_konj]

boys wat u think is beta for drag car setups...... my view is that a twin turbo setup is beta... a smaller turbo for lower rpm boost and a bigger turbo for high range rpm.

[WasteG8]

ive heard that a single turbo is better, with nitrous adding power at lower rpm. A twin turbo set up is harder to tune, and not as reliable as a single turbo/nitrous system.

[Imortus]

ive heard that a single turbo is better, with nitrous adding power at lower rpm. A twin turbo set up is harder to tune, and not as reliable as a single turbo/nitrous system.

Ok, I dont know if its more convenient to have two turbos.
But I know one thing. You should not use/add nitrous while your car is going at a low rpm. Thats gonna wreck your engine.
The nitrous does best effect if added at higher rpm.
Also, the button thing u see in the fast and the furious is not verry good.
It is better to program the nitrous system to inject at a sertain rpm.
At least that is the way it is most commonly used by streetracers in Norway.

Thank you..

[megotmea7]

using nitrous at higher rpms will produce the most peak power but it is best used to help spool the turbo at lower rpm in most cases and having the turbo provide the top end power, using nitrous at all can be bad regardless of rpm depending on how your car is setup, if its built and/or tuned well and its not too big of a shot there is very little to no wear, also assuming it is used properly

[1200RC]

Hey guys, im diggin up an old thread here but i stumbled upon it during a google search

it's an interesting read, apart from the bitching

i thought you guys might be intrested in my car:
i have recently finished building a twin turbo a15 (1.5ltr) for my datun 1200, i have setup what i guess is "tandem", with two equal sized turbos (each off a diahatsu diesel 1000cc), i have two cylinders feeding each turbo seperately

the whole system is blow thru using an intercooler, bov, and weber 32/36 carby. i have had problems with fuel as yet (using a holley black 14psi pump, but i have not drilled out the jets and suspect this is my problem at this stage. i took it to heathcote on the 2nd may and ran a 15.9, i was a bit dissapointed to be honest, but my excuse is i could not get full throttle and the car was stuttering above 4500rpm (wouldnt rev past 4800 at all).

Im planing to have a bit of a play then take it back in maybe a months time when i get it right, but for the mean time i have to get rid of my defect notice.

The setup seems to work well so far, it makes 10psi boost at around 2500rpm and holds it through the revs, 10psi is the maximum i wanted to use as the internals are all stock and the carby is not boxed. And in fact 10psi is the minimum boost i can run without modifying the actuator arms (i linked the boost signal to each actuator to equalise the turbos and put a tap in the line t increase vboost but the tap is fully open at 10psi ). future plans include a factory injection manifold i have and a low compression head.

exhaust manifold pic:
http://datsun1200.com/modules/myalbu...o.php?lid=2874
engine bay pic (90% complete):
http://datsun1200.com/modules/myalbu...o.php?lid=3496

let me know if you are intrested any further?

i havent filled out my profile properly yet either but im in melbourne, aus

[megotmea7]

just some constructive criticism but you may want to rethink your manifold construction, looks like theres some power and increased spool up to be had there, as far as a turbo for each 2 cylinders i think you'd be better off just piping it all togehter and having 2 turbo's for 4 cylinders, might help spoolup also

[Egg Nog]

Originally posted by WasteG8
ive heard that a single turbo is better, with nitrous adding power at lower rpm. A twin turbo set up is harder to tune, and not as reliable as a single turbo/nitrous system.

Do you actually have any idea what you're talking about? Because it sure doesn't sound like it... Where have you "heard" this from?

[fuzzyp]

Do you actually have any idea what you're talking about? Because it sure doesn't sound like it... Where have you "heard" this from?

if you run a v6 you need twins, v8 quads for all out power. v12's you've got your head up your bum.

[fuzzyp]

Do you actually have any idea what you're talking about? Because it sure doesn't sound like it... Where have you "heard" this from?

dooh!!! the turbo builds pressure, once you have high pressure(boost setting) you then add nitruos. you fool the other way roud you will be chewing onm your engine.

[WasteG8]

ok, if ur such a pro, then whats ur thinking on the topic?

[crisis]

Apparently if you set two in parralell, A small on and a large one, the small one will provide low doen torue with the second one coming on line later to give you big numbers up top. Thats one theory I read. It depends on what you want. Drivability or postal, all out power.

[Nildo]

Crisis, the sequential twin turbo set up you have mentioned is already available on many road cars, most notably the JZ80 Supra and series 6 RX7. It provides excellent drivability and good power production through the rev range. Try driving a supra in 6th on a motorway and see what I mean! In the RX7 it wasn't set up well though, and as such doesn't work properly.

For drags the fastest jap cars ALL run twin parallel turbos. The secret is the launch RPM, which is why the Skyline GTR is so popular. It can be launched at 9000 RPM with the right clutch (redlines in RH9 club cars are typically around 11500 RPM) meaning there is no need to worry about low end power delivery.

Of course it is total crap to drive the car anywhere, but very fast. I think the record for a street GTR is aound 8 seconds at the moment.

[Nildo]

Crisis, the sequential twin turbo set up you have mentioned is already available on many road cars, most notably the JZ80 Supra and series 6 RX7. It provides excellent drivability and good power production through the rev range. Try driving a supra in 6th on a motorway and see what I mean! In the RX7 it wasn't set up well though, and as such doesn't work properly.

For drags the fastest jap cars ALL run twin parallel-not sequential-turbos. The secret is the launch RPM, which is why the Skyline GTR is so popular. It can be launched at 9000 RPM with the right clutch (redlines in RH9 club cars are typically around 11500 RPM) meaning there is no need to worry about low end power delivery.

Of course it is total crap to drive the car anywhere, but very fast. I think the record for a street GTR is aound 8 seconds at the moment.

[bonzaisushi]

for a drag setup single turbo is better.... if u look at most the supras well atleast hear in the us alott of the 10sec or lower supras runn single turbo setups a big ass turbo...... like nildo said when ur draggind u dont launch and 1k rpms, u launch at 5-6 k at almost full boost, with twin ur splitting ur exhaust gasses, in 2 with single ur putting all ur exhaust pressure into 1 turbo.... but if u want real power like over 1khp then u just run 2 big turbos and u can be a happy camper good info nildo

[Viper007]

for a drag setup single turbo is better.... if u look at most the supras well atleast hear in the us alott of the 10sec or lower supras runn single turbo setups a big ass turbo...... like nildo said when ur draggind u dont launch and 1k rpms, u launch at 5-6 k at almost full boost, with twin ur splitting ur exhaust gasses, in 2 with single ur putting all ur exhaust pressure into 1 turbo.... but if u want real power like over 1khp then u just run 2 big turbos and u can be a happy camper good info nildo

Congrats we have a winner on how to get the slowest effing launch ever due to turbo lag. Next time I'll just strap your car down to an 18 wheeler and let go in 2 or 3 seconds. Sound good?