Twin turbo vs single turbo

[netmechanic]

When we used V-12 Aircraft engines in out raceboats we used twin Garret and Holset turbos, 28 Liter Engines cranking out 5000 hp on straight methanol

[shadow334485]

blah i got more hp in my lawn mower :P

[Kibwe Walker]

Has more to do with exhaust design and spacing.

A V design motor will make more and have more overall area under the curve with a TWIN setup (equal spacing on both banks). Not saying power can NOT be made with a single because it can and if you have the space and turbo large enough you can ultimately make more peak HP with that SINGLE too.

If you are racing peak hp means nothing, its AVERAGE hp and overall area under the powercurve. So you can make 50 more hp than the guy next to you but if he AVERAGES more hp over the curve (spools up quicker and stays flatter), he will most likely make it to the end of the 1320 before you do.

For flat 4's, and inline motors spacing allows for single setups more often (Especially with the length of a INLINE 6, Aka supra), but the supra and skyline even though they are both inline 6's differ in exhaust pattern and outlets. The supra's 2jze is better suited for a single while the skyline can sport twins being setup like a V motor exhaust wise.

3s specific power can be made either way BUT here is one thing we don't have luxury of to date. RPMS . When a supra runs good times with a single they are pulling 9-10k rpms. Our 6g72 runs into problems up in that rpm range from what I gather and we don't have a abundance of automatic setups that can handle the power/shifting effectively anyways.

Guess its a good thing all these strokers popping up. With that extra displacement you effectively move your power curve to the left some negating the need for that much RPMS to make power, and also cutting down on the boost level required to make big power. Its a good day to own a 3s. A 3.4-3.7 litre stroker with heads and cams will make gobs of power and torque and you would not have to take it past 8500 rpms to do so with a large single or twin DBB setup.

[IttyBitty9Bees]

actually scratch that 20g idea....just took a good hard look at its comp. map. That thing is a joke. I have such bad ass headers on there now, I almost completely refuse to give them up in order to go another twin route. So, since anything with the flange will bolt up, was thinking about some of these 'hybrid bolt ups' that the dsm guys use when they want to keep their stock manifold flange.

How stupid would it be if I managed to shoehorn a couple of fp3052's on those td-05 exhaust flanges.

for reference......

http://store.forcedperformance.net/m..._Code=Turbo-FP

[Kibwe Walker]

Originally Posted by IttyBitty9Bees

actually scratch that 20g idea....just took a good hard look at its comp. map. That thing is a joke. I have such bad ass headers on there now, I almost completely refuse to give them up in order to go another twin route. So, since anything with the flange will bolt up, was thinking about some of these 'hybrid bolt ups' that the dsm guys use when they want to keep their stock manifold flange.

How stupid would it be if I managed to shoehorn a couple of fp3052's on those td-05 exhaust flanges.

for reference......

http://store.forcedperformance.net/m..._Code=Turbo-FP

IIRC Jeff (IPSJeff)had some GT30r's on his 3s at one time. You can talk to him about how they responded though like I mentioned you would probably need some decent RPMS or displacement and lesser rpms to make them work optimally.

[IttyBitty9Bees]

I did...evidently it wasn't TOO bad...and that was still with the 3.0 liter.....but the point that I exhaust the e16g's is the point I need to build the motor anyways, and I'm already contemplating getting stroked, anyways, so I'm sure between stroked motor and ball bearing turbos, the spool characteristics would almost similar to what I have now with the e16g's, which is actually quite fast fo r the power i'm making.

[IttyBitty9Bees]

actually i *think* dynamic racing has a garrett gt30xx kit with headers and all that jazz. Maybe Matt will chime in with some history and characteristics and results or something with that. I'm exploring any option I have to stay twins when I've hit a dead end with these e16g's (which is a LOT of horsepower from now).

[SnakeSkinner]

Originally Posted by IttyBitty9Bees

actually i *think* dynamic racing has a garrett gt30xx kit with headers and all that jazz. Maybe Matt will chime in with some history and characteristics and results or something with that. I'm exploring any option I have to stay twins when I've hit a dead end with these e16g's (which is a LOT of horsepower from now).

I do sell GT-3071, 3076, 3082 kits if customers want them, but...

My experience with GT3071's (what use to be called the GT30R) and GT3076's are that I don’t like them. Thy spool too slow, for the most part I hate the GT30 turbine wheel (and the GT-35 turbine) with less then 2L spooling it... Thy do flow good, and will make good peek power #'s, but I like the T-3 turbines better with small CID turning them. Even wonder why it took me 818 peek hp to run 9.05 and another person 995 peek hp (with the help of NOS) to run 9.21? More power under the curve.

[IttyBitty9Bees]

Originally Posted by SnakeSkinner

I do sell GT-3071, 3076, 3082 kits if customers want them, but...

My experience with GT3071's (what use to be called the GT30R) and GT3076's are that I don’t like them. Thy spool too slow, for the most part I hate the GT30 turbine wheel (and the GT-35 turbine) with less then 2L spooling it... Thy do flow good, and will make good peek power #'s, but I like the T-3 turbines better with small CID turning them. Even wonder why it took me 818 peek hp to run 9.05 and another person 995 peek hp (with the help of NOS) to run 9.21? More power under the curve.

was that 818 awhp from a stroked motor or stock displacement?

[SnakeSkinner]

Originally Posted by IttyBitty9Bees

was that 818 awhp from a stroked motor or stock displacement?

3.54L at 24psi of boost 818hp

903 hp at 30psi