Buick turbos and import(supra, skyline) turbos....

[fbodlovr]

Im curious to know why the aftermarket turbos for these cars seem to spool a lot louder over the other. I have heard buick turbos, and their aftermarket turbos. And from what I can tell, it seems like the supra and skyline aftermarket turbos spool up incredibly loud. Why is that? Are they larger turbos, and that is what causes them to be so much louder? If they are bigger, what size are they to be that loud!?

[johnnyttype]

im not sure but i would imagine that it has to do with the design of the intake tract, exhaust after the turbo, where the turbo is mounted. that kinda stuff!

like sts kits for corvettes. the turbo replaces the mufflers in the back of the exhaust system. that makes for one wicked sounding car! do a youtube search on "sts corvette"! they sound awesome!

[fbodlovr]

Yeah, I know the buick turbos are kind of loud, but I wish they were intimidating!!!

[johnnyttype]

yea, some def. r more intimidating than the others. i love to open my dump pipe. makes a pretty good difference in turbo noise. a real head turner at the track!

[johnnyttype]

ha, when u say intimidating do you mean like this!

YouTube - sts turbo corvette

[BlackMetal]

Yeah if you want to hear your turbo just run an open dump pipe, spool up is extremely obvious then.

[fbodlovr]

YouTube - loudest turbo ever

YouTube - supra vs skyline

YouTube - 9 second street supra

All of those are pretty loud turbos. Why arent the turbos for buicks normally that loud??? Also, what kind of power can a STOCK 87 engine handle? And what DOES it take internally to make about 700 to 800 hp?

[BlackMetal]

Well don't forget all those videos are taken from outside of the car, the first video even has the hood up. The drivers of those cars might not think their turbo is loud from inside the car either.

Here's an example...
YouTube - BLACK On Dyno

[fbodlovr]

Turbo, is that your car? Also, that is kind of loud, but it seems like the others are a lot louder still. They just sound like they are going NUTS comparted to that one. Is it because the others are pushing more boost, and the one in the vid you posted isnt?

Doesnt a turbo get louder with the psi it puts out?

[johnnyttype]

well apparently u have not heard this granny...well sorta granny, in spirit!
YouTube - Chris chow gn
i bet u the first two videos didnt even have air filters on the cars so it should be loud!

chris chows granny doesnt have any air filters either, but at least his hood is down

[grocerygetter]

Skyline's aren't that loud...really no louder than my car. A friend of mine has a RB26 swapped 240 (yes...that's seriously hardcore)...his sounds wicked.
A lot of the Supra guys are running hi 20 psi to 40 psi too.

[notacarlo]

This reminds me of a thread on a Ford Diesel board. It seems that if you can't hear the turbo, you aren't going fast.

I could care less about the sound it makes as long as it pushes this car to the edge of lightspeed.

Import cars with lower c.i.d. motors and large turbo - seems like to me that all you would hear is turbo.

Now a larger displacement engine AND a matched turbo for the set up - seems to me like you would get a nice 50/50 mix of motor and turbo.

Let's change the direction of this thread. WHY DO 9 SECOND TR's SOUND LIKE BIKES?

[johnnyttype]

Originally Posted by notacarlo

WHY DO 9 SECOND TR's SOUND LIKE BIKES?

good question, maybe its because they r using 4.1's instead of 3.8's. ive always heard they sound fairly different, i believe more raspy!

oh, and how they heck do supra's run 40psi of boost??? im sure they do but wouldnt they need some serious octane to do that? what kind of compression do those engines run?

[psycho6cyl]

Susposedly those Supras can handle 1000hp from factory. That 2JZ motor is one of the best built. I dont know how true this is, but inagine the 109s doin 700-800 w no problems??? Dreams....

[fbodlovr]

How much can the stock engine handle?

[johnnyttype]

Originally Posted by psycho6cyl

Susposedly those Supras can handle 1000hp from factory. That 2JZ motor is one of the best built. I dont know how true this is, but inagine the 109s doin 700-800 w no problems??? Dreams....

i guess i can see how the bottom end of a supra is superior to a buick. buicks have 4 mains for 6 cyl., as opposed to 7 mains for 6cyl. on a supra! i cant see how any crankshaft made from the factory would be able to hold up to 1000hp.+! let alone the pistons and rods! yea it may work for a few dyno pulls, but i cant see it lasting very long at all!

[fbodlovr]

Does nobody know the question to my previous post?!

[johnnyttype]

for a buick engine?

[cstavro]

those 700 whp supras have no low/mid range torque. torque is what kills parts. a 500 whp buick will make 700 wtq.

revs kill too, but supras have lightweight pressure cast pistons. they're 1.34" tall, and weigh <344 g. the rods are 5.59" and weigh <524 g (these are forged aftermarket parts).

in comparison, buick pistons have a 1.85" height, and weigh 541 g (more than the supra rod!). it's rod is 5.96" and weighs much more (700+ g?). that means that while a supra is happy at 8000 rpm, a buick doesn't like anything above 5700.

the 4t65e trannies in late model cars can't take more than 420 whp (which comes with 500+ wtq). series 2 engines are good for 550+ whp on stock internals - maybe much more if torque can be managed. cross bolted mains, and sinter forged rods help stock heads, a 206° cam, stock manifold, 1.9:1 rockers, and t4/60-1 turbo have made 478 whp.

in our defense, toyota had a german company do the engineering on the 2jz to homologate it for jgtc competition. imagine gm putting the LSX or R07 in a car...or cut off 2 cylinders for a 4.5L v6.

[johnnyttype]

Originally Posted by cstavro

imagine gm putting the LSX or R07 in a car...or cut off 2 cylinders for a 4.5L v6.

that would be awesome... LSX V6!!!