Single Turbo Supras

[dannyvd]

i was talking about the engine bay paragraph

[dannyvd]

sorry man i am really stupid i will shut up now sorry

[flylwsi]

there's twin turbo upgrades, as the turbos are run just like a skyline, so you can upgrade both...

switching to one large one simply allows your motor to make more power, since a big single could be rated for more power than a pair of smaller turbos...

they breath better...

[phatdex]

But one large one doesnt necessarily make more power.
Put a T-88 on a GTR and u may get 800rwhp. Put 2 GT3540's on a GTR and u may get 1200rwhp. What u said was a bit of a generalisation.
I see it that for the money u will get more power from a single. But if money is no issue than u cant beat 2 quite big turbos in parallel.

[flylwsi]

with one massive turbo, you'll make more power in the extreme end of it...

you'll max out the two smaller turbos before you max out the one big one...

it's a driveability thing too, b/c big ass turbos take till almost 5k to spool...

i realize i'm generalizing, but i don't want to type a book...

[phatdex]

On say, the GTR engine, u wont max out the two smaleer turbos because each turbo will only be working off three cylinders. So each 3540 would be working off 1.3L
Twin turbo GTR's with GT3540's have shitloads of lag too.
Whereas a GTR with a single T-88 is working off all six cylinders and the full 2.6L's or more if made bigger.
The fastest skyline in the world uses twin GT3540's. Most of the RH9 cars have either twin GT3540's or twin GT3240's.
GT3540's are actually about the equivalent of a T-78 (a tiny bit less power). So its two T-78's instead of one T-88.

[flylwsi]

but the fastest supras are single turbo...

and there's one out there with a t100 on it...

there's an 8 sec supra that runs single turbo, and most of the supras that are drag cars that i've seen are single...

and from what i've seen of fast JDM tuned skylines, most have big singles for the track and duals for the street...

i can't think of who off the top of my head, but i do know of some AUS tuners that run single turbo skylines, a red 9 sec r32 comes to mind...

[flylwsi]

it's interesting that skylines run doubles more often though... with the exvitermini.com car running 2 VeilSide/SPL GT-3540 turbo chargers...

hmm... and he runs 8's... i dunno...

[phatdex]

With supras I think its because the stock twins on a supra both work off the 6 cylinders whereas the skyline has 3 cylinders for each turbo.
The supra has some sorta weird parallel and sequential setup. The turbos are sorta in a line where one gets the air first and then the other but they are the same size and stuff. Thats why they normally just go single.

Single turbos are a much cheaper setup to do, I know of 3 or 4 ppl in my car club with R32 GTR's and single T-78 turbos. It is within the reach of the normal man. Twin 3240's etc are not within the reach of someone with limited financial means.

Looking at my list of GTR's in AUS top times on street tyres.
The top is twin TD06, second is T88-34D, 3rd is t88-34D, 4th is twin 2540 and 5th is twin AX53B.
But bear in mind the top car has only done a 9.749.
These are all on street tyres tho.
The HKS GTR has twin 3540s, and they've run a ~7.5sec 1/4.

If I was making a drag car, I would much rather have twin 3240's or similar.
I have been in single turbo GTR's and I dont like it much.

[panozracer]

Actually your choice of single or dual really is about opinion, the main reason you would want either setup depends on money and, the only reason is that bigger turbos don't heat the incoming air up as much as smaller turbos do, creating a colder denser air charge, therefore more hp at same psi. You can always change the exhaust a/r and have the turbo spool up somewhat faster with less top end but the only other thing I can think of would be that two turbos would have smaller turbines that would spool quicker because the mass is closer to the center of rotation and when the turbine is trying to reach speeds anywhere from 85k to 150k I would think a it would matter alot more especially when we can notice a difference at low speeds in a physics demonstration at your local science museum.

[panozracer]

For the record, the fastest street legal car in the world in a 1300 hp twin turbo skyline owned by the owner of veilside. I believe it has hks twin 3540 ( Don't look for these on hks's website, they are cut\stom hks turbos). And if a 2500 cc engine that can only reach 2926 on an overbore at max, I would think atleast a 3 liter inline six could spin them, you would have to have a redline around 9500 though and about 250000 grand elsewhere in the engine.

[phatdex]

Yes, the veilside is the fastest street tyre GTR at the moment because the HKS car runs slicks. (there are quite a few other street tyre GTR's in the 8's in Japan tho)
Remember tho, the 3540's dont act like small turbos because they only have 3 cylinders and 1.3L of engine capacity spinning each of the turbines.

U can get more power from 2 mid/large turbos than one big one because together, the two mid/large turbos flow more air.

[flylwsi]

i'm hoping you only meant what phatdex said, b/c there's 6 second "street legal" cars here...