Thats on BFG's. Thats the same car that won the BFG drag radial war shootout with the top turbo domestics...including Big daddy. Those darn 2JZ-GTE's are insane motors. Only reason why I bought one, and also they look pretty cool . The stock motor record was broken this past week also it was 954rwhp, now its 980rwhp through an auto tranny .


Jose

 

Kenny duttweiller's TT 4.5L stage 2 Buick V6 just pulled over 1600rwhp and blistered the 1/4 with a 6.90 @200. ~40lbs of boost from intercooled twins. Yes it was on slicks, but tell me something.... where's a drag radial that won't explode from that kind of power? He also built a TT 502 BBC that makes over 2500hp and idles like your average mild-cammed small block. And i can name about 10 turbo6 buicks right off the top of my head that make over 1000rwhp.

See where i'm going with this? It's not an import thing... it's the technology at hand and how you use it. A 350 cubic inch V8 pushed by 25lbs of boost will make a HELL of a lot more power than a 4 banger at a 1/3 of the displacement at the same boost levels. Plus the bigger engine, in most cases, will be able to handle more boost/power before block destruction occurs. Why try to make 2000hp with a block that is known to split at 1000hp? There is a point of sensible practicality.

But back to the import thing, I'm guessing since their parts and such are smaller they can affort the better forged pieces and such, so stock for stock they handle it better

 

or faster Also, if you were to go back through last year's PHR mags and find the article on a Quad Turbo GM DREC blocked car, can you say, 35#s and 9K+ rpm, making somewhere around 2200 - 2300 HP. Needless to say, its all in the rods, cam, hairdryers, and engine tune.

 

So they pay for half of what we pay for when we buy 4340 forged engine parts. Its a bit cheaper that way. Also, most of the 4 bangers have DOHC, their 4V heads are extermly efficient and since they are reving a good 2-3000 more than most of us, this gives them even more efficiency.

BUT a 2.0L turbo running 25lbs of boost vs a 7.0L turbo with 25 lbs.....In almost all the cases the 7.0L will make more power and be more reliable. WHY? Since there is a larger displacment it makes the turbo's job to reach your hp goal a little less hard since having that extra displacment helps up the power some more. Also the larger engine wont need to be revved as high to make the power.(notice i said need....casue I know i wanna rev to 8 grand and push 25psi!!)

I think why most people see imports with lots of boost is becasue they need it to get the power they want.
Since they have less displacment, they will use boost to get to their goal, while people with more displacment will use that to get to their goal and run less boost.

Have you seen the EVO VIII? 19.8 psi on a stock motor! Thats alot of boost to be running through a production car in my mind.
And its only making about 280hp...put 19.8 psi on a 5.7L....you would be silly to not get at least 650 hp out of it.
I question Mitsubishi's reasoning on using such a high boost pressure and coming up with only 280 hp. The STi is using half a liter more and only running 14 psi and its making 300/300 hp/tq. That sold my gf on the STi...now only if I can convince her to let me crush the wastegate in and get a few more psi..

Sorry to blab.
Hunter

 

To try and answer the original question of "why CAN they run high amounts of boost with stock engines":

There are several factors that allow them to run more boost:

1. Smaller bore sizes are far less prone to detonation. For example, my street bike runs 13/1 compression and NEVER detonates, even with 89 octane, 100 degree weather, and 280 degree coolant temperatures.

2. The skirted 6 bolt main engine blocks that many foreign cars use are pretty d@mn stiff and don't break under boost. Chevy, Ford, and Dodge finally caught on to this advantage with their latest families of V-8.

3. The smaller motors can use a reasonably small turbocharger and still make 20 psi boost. My T-trim, spinning at its max rpm, can only supply 14 psi boost to my 355. In order to do 20 psi and up, I'd need a cog-driven YS trim, which isn't all that easy to install or purchase.

Mike

 

This thread made me finally register.

I owned a 4-cylinder Dodge Avenger for a couple of years until we traded it in for a minivan. The car is mechanically similar to the Mitsubishi Eclipse and Christler Seabring (and maby the Eagle Talon, but that doesn't sound right.)

Anyway, I was interested in getting a turbo charger for it, and I found out that there was a ton of support for it, really because of all of the aftermarket stuff for the Eclipse. Mitsubishi and especially Honda figures out years ago that they could make low-powered cars that passed emmissions and economy laws, but be able to be boosted. Then all the souped-up cars would become free advertising. That's why they have bearing girdles and forged internals on a 2-liter motor that makes 130 hp.

Every new 4-cylinder (and some 6) honda engine is made with minimal external changes (to exaust manifold stud locations, etc.) to make sure the maximum number of existing AFTERMARKET parts will work on it. That way, a new car has after market support before it gets built. Then, people go out and buy new Hondas and soup them up.

Why do you think those companies sponser movies like The Fast and the Furious? Major advertising.

Dodge tried to get on the band wagon with the Neon, but when they went to a bigger 4-banger they made the engines completely incompatable-they rotated in the opposite direction, or something really major like that. No one is going to develope 2 different turbo kits for a Neon when they can develope 1 kit for half of the 4-cylinger Hondas ever made.

 

I think you need to read the post I did again. Who said anything about it is an import thing I simply said Titans supra ran a certian time. Oh! and I know of about 14 or supras over 900pplus hp .... and ??


I have a cutlass with a GM crate motor in it (ZZ430 with a jug) so I am a domestic guy here to (in case there is bashing happening)

Duane

 

Not bashing... just funny how every post about fast boosted cars ALWAYS ends up with SUPRA in it somewhere. Just out of the blue a supra owner/fan will come on in and "innocently" mention their car. Even on domestic boards. Just making sure you weren't one of the majority of supra owners/fans (with their heads completely up their own ***) that like to poke into everybody's business so they can to brag about their cars and talk trash about everything else. Most must think that the supra is the only fast turbocharged car in the world and that nobody makes a better/faster car. You can't deny that.... look at the net, the movies, and all the ricers in the world. Yes it's a great car.... but lately it's getting rediculous. Some owners are cool though... I know one right here in town with a beautiful Black BPU 6 speed. But he hangs around at the strip and knows what domestics are capable of. There are more 5sec 1/8mi big and small block street cars around here than you can shake a stick at (sadly, most are mustangs and old muscle cars.... few f-bodies to be found).

Just testing the waters bro.... peace

 

As I said I know what the Domestics are about as I said I have one. (read above post from me)

I do however know what you are talking about. My Supra is actually an MKIII which I don't get to brag. Most people don't even know my gen supra. They think F@F supra

To be honest even as a Supra owner, the MK4 guys are generally pretty cool but alot are a$$ Plain and simple.

I like both cars (doms and imports)

I actually like my cutlass at the 1/4 mile track better than my supra.

Duane

 

hmm you obviously dont know what your talkin about...

most built imports run 11's on sub 20 lbs of boost.. atleast dsms.. it all depends on the turbo choice and its efficiency...

ever heard of john shepard? he ran 8.94 @ 157 mph in his DAILY DRIVEABLE 1991 awd eclipse on around mid 20 psi...

i love imports and domestics but its people like you(in both import and domestic crowds), that are ignorant, that cause all this clashing.. please do your research first..

also, the d16 series of SOHC honda motors can handle up to 15 psi on stock internals with excessive tuning.. and last.. dont have the answer to the question though..

 

are you retarded?..........read the rest of the thread..........i said it was in jest..........its people like YOU that go off half-cocked and start preaching........wash the sand outta yer crotch and calm down.

 

19.8 psi on a stock EVO VIII? Who told you that? I think they run around 16#s actually, which isn't that much. 4g63s can easily hold close to 30 psi on stock internals. Anyways, the car is HEAVILY restricted, and maybe even a bit under-rated. All cars in the Japanese Domestic Market are rated at a max of 271 HP, even the EVOs/Skylines/etc, which make well over 300 hp. Open up the EVO's intake and exhaust tracts a little bit, and you're set.

 

Hey thanks for mentioning the Buick V6, those are insane numbers for a V6 .... Of course when you have a guy like Kenny building them, this helps. T/A performance just came out with an aluminum stage 2 block, maybe that's the one he used. The block is only 3 grand.

 

no, im not retarded... i wasnt going off "half cocked" and i wasnt preaching... i was tellin you what i thought.. im sorry you got upset and decided to call me silly names and make comments about my crouch.. lol i think you need calm down, your making me look better than yourself..

 

that used to be the the guidlines in japan but its lifted now.. expect to see some pretty fast imports soon.. hopefully the new skyline and supra.. oh yea.. nice car!

to the other guy, it depends on the turbo.. 19 psi on a 14b for example wouldnt yield the same output as say 15 psi from a 20g.. differ CFM's.. so psi isnt the only thing that matters..