twin turbo SR w/ 795ps

[karay240]

yup, you read it right. I've read all kinds of people talking crap about twin turbocharging a small engine like the SR. Saying that "there's show factor, but it wouldn't be any good." Well, here's some proof that it CAN be really fast.

http://www.ksp-eng.co.jp/ATTAIN/menu3/

I translated it for the Japanese imapired. lol.

ATTAIN Drag Demo S14

JUN 2.2 stroker kit w/ JUN pistonsƒGƒ“ƒWƒ“=SR20DET/2200cc ƒsƒXƒgƒ“=JUN

Tomei Con RodsƒRƒ“ƒ?ƒbƒh=“Œ–¼?@

Cams=Tomei, Port & polish, along w/ custom combustion chamber designƒJƒ€=“Œ–¼?@ƒ|?[ƒg?•”R?ÄŽº‰Á?H

HKS head gasketƒwƒbƒhƒKƒXƒPƒbƒg=HKS

750cc main injectors w/ 550cc x4 additional injectorsƒ?ƒCƒ“ƒCƒ“ƒWƒFƒNƒ^?[=750cc ’ljÁƒCƒ“ƒWƒFƒNƒ^?[=550cc?~4

Additional injector controler from HKS’ljÁƒCƒ“ƒWƒFƒNƒVƒ‡ƒ“ƒRƒ“ƒgƒ??[ƒ‰?[=HKS

Bosch Fuel pump & NGK spark plugsƒtƒ…?[ƒGƒ‹ƒ|ƒ“ƒv=ƒ{ƒbƒVƒ…?@ƒvƒ‰ƒO=NGK

HKS Oil Cooler & ATTAIN RadiatorƒIƒCƒ‹ƒN?[ƒ‰?[=HKS ƒ‰ƒWƒGƒ^?[=ATTAIN

Twin HKS GT2530 turbos running through ARC intercoolerƒ^?[ƒrƒ“=HKS/GT2530?~2 ƒCƒ“ƒ^?[ƒN?[ƒ‰?[=ARC

HKS EVC.Pr Boost Controlerƒu?[ƒXƒgƒRƒ“ƒgƒ??[ƒ‰?[=HKS EVC.Pr

HKS Waste Gate & KSP Exhaust Manifold and ExhaustƒEƒFƒXƒgƒQ?[ƒg=HKS?@ƒGƒMƒ]?[ƒXƒgƒ}ƒjƒz?[ƒ‹ƒh=KSP ƒ}ƒtƒ‰?[=KSP?@

OS Giken Triple Plate Clutch, and NITTO tiresƒNƒ‰ƒbƒ`=OSƒgƒŠƒvƒ‹?@ƒ^ƒCƒ„=ƒjƒbƒg?[

HKS 6 speed transmission W/ a R33 Differentialƒgƒ‰ƒ“ƒXƒ~ƒbƒVƒ‡ƒ“=HKS6‘¬?@LSD=BNR33

HKS Hyper Damper CoiloversƒTƒXƒyƒ“ƒVƒ‡ƒ“=HKSƒnƒCƒp?[ƒ_ƒ“ƒp?[

Project ƒÊ Brake PadsƒuƒŒ?[ƒLƒpƒbƒh=ƒvƒ?ƒWƒFƒNƒgƒÊ

First (or fast. I'm not sure) Body Kitƒtƒ?ƒ“ƒgƒXƒ|ƒCƒ‰?[ƒTƒCƒhƒXƒeƒbƒvƒŠƒAƒAƒ“ƒ_?[ƒXƒ|ƒCƒ‰?[=ƒtƒ@?[ƒXƒg?iƒ‚ƒAƒRƒ‰?[ƒWƒ…?j

MOMO Stearing Wheel, OMP SeatsƒXƒeƒAƒŠƒ“ƒO=ƒ‚ƒ‚?@ƒV?[ƒg=OMP

TRUST Seat BeltsƒV?[ƒgƒxƒ‹ƒg=ƒgƒ‰ƒXƒg

Max Power: [email protected]/cm2 of boost (measured using KSP chassis Dyno)?Å?‚?o—Í?@795ps/ƒu?[ƒXƒg2.1kg/cm2?iKSPƒVƒƒ?[ƒV?[ƒ_ƒCƒiƒ‚‚ðŽg—p?j

I know they spent a fortune building this thing, and that your average Joe isn't going to be able to replicate it, but I still think that it's pretty sweet.Also, there will be all kinds of lag w/ two turbos that big (considering it's just a 2.2 liter), but what do you guys think about pulling two turbos from the Audi/VW 1.8 engine, and puting 'em on a KA? It'll be a modest 300-350hp, but I think that the lag could be kept to a minimum.

[karay240]

ahhh!!! the Japanese didn't show up. oh well. . .

[Structure240sx]

thats crazyness. theres sumthin about that purple. it really jsut made me want to paint my car purple i dont know why jsut seems badass but in a fruity way

[Adikt]

purples a fruit right?

[barrigas14]

so the engine is now stroked to 2.2L...show me a dyno slip and i bet lag sucks.

[rico05]

Darn sweet...But I'd rather have the FC.

[NX95240]

purple look pretty bad.

[D1SR240]

who cares what the color is, i mean its a damn twin turbo SR. btw karay240, how do u know japanese?

[180crafter]

D1SR240 I was wondering the same thing. Im learning slowly, but the process sux.

[karay240]

I kinda cheated. . . I was born & raised there. Went to Japanese public schools and everything:D

[Supafly]

power probably doesn't start to build until about 5k, but oh well. it's still not a practical application. i could make just as much power out of a well sized single and eliminate some lag.

[karay240]

Power won't come on until over 5k anyway. . . it almost has 800horse power. . . from a 2.2liter!!!As a reference, I believe JUN made a Silvia w/ close to 800hp (it might have "only" been 600-700hp. . . yea, only), and I'm pretty sure that car had all kids of lag. . . Just a reminder, a "well sized" single will NOT produce 800hp. . . a well sized turbo for the SR produces 300-350hp.BTW, if it'll have so much lag, why do manufacturers make twin turbo automobiles. . . I'm not trying to be a smart a$$. Just want to clarify some stuff. I know that for a skyline or a Supra, twin turbocharging reduces lag. . . why won't it for the SR?I'm assuming it's b/c of it's engine size, but I personally haven't tried it, so I don't know.Although I appreciate the input, I would like someone that actually knows a great deal about turbo tuning & thermal dynamics to explain this to me. I've heared the cliché "it'll kill the low end." I'd rather to get descriptive paragraphs, not sentences or smart clichés. Thank you to anyone that can contribute.

[PacManVR4]

2530s are not big turbos. I dont think lag would be as bad as people make it out to be since they raised the compression and made the motor larger. The BB turbos help too, Im thinking 4500 or so on spool but thats not realley that bad but I wouldent try to merge in traffic with it.

[sil80S13]

i hate to be a noob, but why are they shifting up, then down to go through gears? i've heard of those before but i dont remember the name. are they running some kinda high perfomance automatic transmission? ...and why is the silvia slower than the rx7's... =( ...

[Hijacker]

I see engine mods, but no 1/4 mile time? It even says it's a drag car, and has a picture of it ;eaving it's rubber in one place, but I would like to see some drag times if they want to claim it as more than just a dyno queen

[S13 King]

nice cars either way.Nice mods either way.

Rico05! You and 7's,lol.

And for those who don't know the ltd color from Nissan offered on the R33 GTR, Z32 TT, and I believe the 180sx. Midnight Purple Pearl that is a bad *** purple.

[S13ChucKAT]

WOW 795ps.. and only running 9's

[Def]

WOW 795ps.. and only running 9's

People in Japan rarely run full drag slicks, usually using only stuff like Nitto drag radials. The peak power on a high specific output turbo engine like that is kinda hard to relate to larger displacement engines like say an 800hp blown 5.0 Mustang with a broad powerband.

Plus that's a late model S14 with a cage and interior. I'm sure the thing weighs every bit of 2900lbs without driver.

They're just not into the whole straightline speed at any cost thing in Japan like people are here...

[ccsteve]

I guess twin turbo is a good idea if you want to blow $3-4k on custom fabrication (making twin turbo manifolds at a custom fab shop is not even remotely close to affordable) and other bs required to make it work, all for 350hp that you can get for half the price from other options, and still have minimal turbo lag. I guess its also not that bad of an idea when you ignore the extra 15-20lbs your adding to the front of your car in materials. It's also prob not that bad of an idea when you dont consider the lack of space under the hood of a 240, and how much extra heat thats going to cause.

[ccsteve]

BTW, if it'll have so much lag, why do manufacturers make twin turbo automobiles. . . I'm not trying to be a smart a$$. Just want to clarify some stuff. I know that for a skyline or a Supra, twin turbocharging reduces lag. . . why won't it for the SR?

You answered your own question. If your hinting at manufacturers doing things write the first time around, maybe that should tell you why they didn't make the SR20 a TT motor.

[Tsukai240]

i hate to be a noob, but why are they shifting up, then down to go through gears? i've heard of those before but i dont remember the name. are they running some kinda high perfomance automatic transmission? ...and why is the silvia slower than the rx7's... =( ...

the silvia is using a R33 6speed trany. wow, is this true? can a sr be bolted to that trany? a setup like that would allow the s13/4 to use a s15 rear end with the HLSD. just a guess.:ylsuper

[C-Boogie]

You answered your own question. If your hinting at manufacturers doing things write the first time around, maybe that should tell you why they didn't make the SR20 a TT motor.

Not trying to be a jackass or anything, but I'm thinking they made it the way they made it because it would be keep costs down, keep power reasonable and in turn, keep sales up. You can sit here all day saying "Well, they could have added this or increased that to have it have more power stock". But really, would adding thousands of dollars more to the initial cost be worth losing tons of sales because now the car is no longer in the same pricepoint? So I guess what I'm really saying is they decided if it performed and cost as it did, it'd sell, and that's why they skipped any further upgrades.On that note, I think what they did is quite impressive. Obviously cost was not an issue for them, though, so as was mentioned it's not too practical for anyone of us to try and copy.

[BoyWonder]

Not trying to be a jackass or anything, but I'm thinking they made it the way they made it because it would be keep costs down, keep power reasonable and in turn, keep sales up. You can sit here all day saying "Well, they could have added this or increased that to have it have more power stock". But really, would adding thousands of dollars more to the initial cost be worth losing tons of sales because now the car is no longer in the same pricepoint? So I guess what I'm really saying is they decided if it performed and cost as it did, it'd sell, and that's why they skipped any further upgrades.On that note, I think what they did is quite impressive. Obviously cost was not an issue for them, though, so as was mentioned it's not too practical for anyone of us to try and copy.

This was my post, by the way. Chris just happened to leave his name logged in, so if you want to flame, direct it at me

[C-Kwik]

2530s are not big turbos. I dont think lag would be as bad as people make it out to be since they raised the compression and made the motor larger. The BB turbos help too, Im thinking 4500 or so on spool but thats not realley that bad but I wouldent try to merge in traffic with it.

Perhaps they are not large turbos, but remember that you are now dividing the exhaust energy in half. Effectively, each turbo is being driven by 1.1L of motor. But it would not really be much worse if at all than a large single turbo.

Realisitcally, in terms of power, neither system should have any notable advantages over the other. It would really come down to the efficiency of the compressor at the projected boost and flow of the motor and also the turbine efficiency. At high boost and flow rates, turbo selection tends to become limited. So if a large turbo is not as efficient as using two smaller turbos, then it would be better to go with two smaller turbos. It just depends. It would be a waste to go to a twin set-up, unless this was actually the case. And for the most part, few of use will make the kind of power that would limit turbo sizing to that extent.