ITBs on 91' 240sx

[Nissan_Tuner]

I happened to come accross this on google and I was wondering what you guys think, so here it is.


Gary Narusawa performs the most sacrilegious act possible to the SR20DET, but we never expected this


By Jonathan Wong
Photography: Wes Allison

According to Yamz’ urban folklore, Gary Narusawa is an old school legend; a street racer from the South Bay area of So Cal who marched to the beat of his own drum by fabricating his own components, all while earning his reputation of being that fast. It’s his school of thought that would pave the way for guys like Yamz and other local DIY’ers. He has owned an arsenal of classic compacts, including a turbo’d V6 ’81 Celica (the same one Yamz later bought and made worse; see our March ’03 issue), a ’67 Datsun Roadster with a 13B rotary conversion, and the S14 he’s become famous for amongst the road racers with its RB25DET powerplant. But even with such highly-tuned vehicles, Gary needed something for the daily drive and settled on this ’91 Nissan 240SX, which he quickly admits, he “got carried away with” during the build up. Fashioned with a common SR20, there’s a twist to the way it’s been set up.
Look closely—what do you see? Well, unless you had the spec sheet in your hands, your first guess that it’s a SR20DET long block would be wrong; it’s actually a S13 SR20DET cylinder head that’s been mildly ported and polished to work harmoniously with a high compression 10:1 S14 SR20DE bottom end.

Gary, who did the engine work himself, also fitted it with 272-degree Bee*R camshafts and upgraded the valve train with sodium-filled exhaust valves from a SR20DET along with Tomei valve springs and rocker arm stoppers. The real trick lies with the intake system, which is a JDM GTI-R ITB manifold that was custom modified to fit onto the head. But the task of getting those to work was not simple; the ITBs also needed the right fuel mixture to get it running, which required Gary to fabricate his own fuel delivery system with ND 365cc top feed injectors from a supercharged MR2 mounted to a custom fuel rail, an AEM fuel regulator, and enough fuel to be fed through the system with a Walbro 255 fuel pump. On the exhaust side, he also modified a stainless header intended for the KA24DE since none of the JDM headers would clear the left-hand drive steering rack, which then leads out to a custom-fabbed, mandrel-bent 2.5-inch exhaust.

[orestes]

looks pretty sweet, but the picture links go nowhere.

[Hit_N_Run-player]

Looks pretty sweet.

[Murherar]

yeah its pretty cool, its the same one that was in superstreet a couple months ago

[Skylindrftr]

im guessing he was going for the n2 endurance look, but you could always do that on a sr20de, which would be cheaper, more practical etc...

[Nissan_Tuner]

it’s actually a S13 SR20DET cylinder head that’s been mildly ported and polished to work harmoniously with a high compression 10:1 S14 SR20DE bottom end.

[Nissan_Tuner]

do you guys think that would be better than a turbo or what? cuz i heard that the ITB is not good for a daily driver because it eats gas like crazy and does harm to the engine when driving it slow.

[nissan_240sx]

Nice, I bet it sounds mean

[Skylindrftr]

They are facking loud
oh yeah and i forgot to read the ss article so i didnt know it was a s14 sr20de with the s13 sr20det woops

[Nissan_Tuner]

yeah i bet its loud but i think that a turbo might be faster, not sure though?

[R.W.240]

Meh, that car isnt too fresh.

The E*SR Cars make me wet my pants though.

N/A is gonna be slower for what money you put into it... obviously. but therer is a bling factor to it.

[D-Bo]

i like the rims too..

[Nissan_Tuner]

yeah those rims are pretty badass

[orestes]

i would drive that shit and just leave it. i bet its fast enough.

[S13wanabe]

Actually, turbo cars being faster than NA cars is a common misconception in the import scene. Now I don't know how much he spent, but NA high reving motors generally get better traction than turbo cars and make up for power differences in traction. Many guys with turbos on street cars just spin tires all day long, and NA guys scream down the track. Top end or freeway racing almost always goes to turbo cars though. As far as pricing goes, turbo kits are around $3000 and you wouldn't believe what and motor could do with $3000 put into it NA. I have a 240 for a daily driver and a Civic for racing. My civic has under $2000 into the motor, and should make around 200-215 whp and revs to over 9,000 rpms. My car should run high 12's. Most civics with the same stock motor and tubos are running mid 13's to low 14's with a larger investment. Yes this is front drive, but with my experience with a 350z twin turbo and sr20det 240SX with some mods, I believe the same holds true for rear drive. I'm still breaking in my Civic motor so please don't ask for proof, but if you do want the proof I will be posting it in the Honda forums soon and you can find it there under the same s13wanabe name.