Throttle Body upgrade for SR20DET

For the RWD SR20DET cars! Sponsored by Wiring Specialties.
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Nicksemianiw
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Is there any throttle body upgrade for the SR20DET or is there no need for one?

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SmithSR
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Tomei search?
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Nicksemianiw
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Thanks..........
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SmithSR
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AWESOME AVATAR!!!! I LOVE IT! why didn't I think of it..
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spider_slayer
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S13 240SX

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i've heard the ka one is an upgrade because its larger in diameter....i'm not to sure however....anyone else know?
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Nismo_Freak
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spider_slayer wrote:i've heard the ka one is an upgrade because its larger in diameter....i'm not to sure however....anyone else know?
On S14+ engines it is.

The DET really shouldn't benefit from a larger TB until you get into the 350+ range.
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9240sx
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Dont forget the big q45 throttle body.
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Nismo_Freak
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9240sx wrote:Dont forget the big q45 throttle body.
Overkill
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spider_slayer
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S13 240SX

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indeed......
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Nicksemianiw
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So the Q45 TB would be a bit much? going from 60 mm to 90 mm LOL
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cville300zx
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Car: 1990 300zx 1993 240sx

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Nismo_Freak wrote:
On S14+ engines it is.

The DET really shouldn't benefit from a larger TB until you get into the 350+ range.
i thought the TB's were the same on all the ka24de's? so there is a difference between a 93 ka24de TB and a 96 ka24de?
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ETTInnov04
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Car: 1989 Nissan 240sx fastback

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No i think he means its an upgrade for the s14+ sr20det.
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Nismo_Freak
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ETTInnov04 wrote:No i think he means its an upgrade for the s14+ sr20det.
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SpeedRacer1
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Car: 1990 240SX, G35

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S13 SR20DET throttle bore = 60mmS14 SR20DET throttle bore = 50mmS15 SR20DET throttle bore = 50mm
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SoCalS14
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I went to a 60mm...some say you get a bit more throttle response...I hardly noticed a difference...Cheap to do though...
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GT Ranma
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Yeah, I had a 60mm or 65mm (Some part I got from a JP corner car store XD) on my S-14, the couple hp you get from this really won't make the car any faster :p I meen, even 10hp is only 5%, so you go 5% faster? O_o; *shrug* I can't tell how fast that is when driving.

But, hat I did knotice was the car idled(I can't spell) a little lower ^^ All it really does it let more air through, some cars restrict a bit and some don't as much. Getting a bigger one eliviates this wee bottle neck ^^ So, of course it's not going to do to much, even if you go 90mm, if it isn't bottlenecked that much with your current setup.

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EazyBreazy
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you could try to find the na sr throttle body, its supposed to be bigger but i dont have the numbers to back that up
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SpeedRacer1
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sdwyzs14 wrote:you could try to find the na sr throttle body, its supposed to be bigger but i dont have the numbers to back that up
Same size as the SR20DET.
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D1SR240
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1991 Nissan 240SX

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Tomei makes a 70mm unit.http://www.jspec.com/tomeithrottle.html
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cheez80
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rnn14, pulsar gti-r tb is larger, iirc.

james from g-dimension recommended that we run one on our 400whp pfc d-jetro gt-rs car.
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Nismo_Freak
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cheez80 wrote:rnn14, pulsar gti-r tb is larger, iirc.

james from g-dimension recommended that we run one on our 400whp pfc d-jetro gt-rs car.
RNN14 GTiR uses individual throttle bodies... collectively it has more area, but individually they are alot smaller.

On a D-Jetro car I would fabricate a vacuum manifold plugged into all the runners post TB so the MAP gets a clean signal, and not a signal from a single runner as the runners will get different pressures due to flow differences.

BTW, the Tomei kit uses a N15 throttle body.
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ETTInnov04
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At what hp would it be time to upgrade your throttle body? The only thing I see that would be worth upgrading to would be the 70mm(S13 here), maybe 90mm for high hp drag applications but wouldnt you have to be up around the 350-400+ range for the larger TB to reallly make a diference?
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Nismo_Freak
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ETTInnov04 wrote:At what hp would it be time to upgrade your throttle body? The only thing I see that would be worth upgrading to would be the 70mm(S13 here), maybe 90mm for high hp drag applications but wouldnt you have to be up around the 350-400+ range for the larger TB to reallly make a diference?
I wouldn't even bother until over the 300 - 350whp range. Even then I don't think you'd get major gains.
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own3d
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Nismo_Freak wrote:
I wouldn't even bother until over the 300 - 350whp range. Even then I don't think you'd get major gains.
hmmmm, why doesnt a bigger TB give any gains, my friends mx6 dyno'd a 7whp gain going from a 60 to 65mm TB, granted its a n/a 2.5 v6 but still, i figured with a turbo the gaisn would be more noticable???
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GT Ranma
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. . . It's not really THAT big of a bottleneck . . .
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Nismo_Freak
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own3d wrote: hmmmm, why doesnt a bigger TB give any gains, my friends mx6 dyno'd a 7whp gain going from a 60 to 65mm TB, granted its a n/a 2.5 v6 but still, i figured with a turbo the gaisn would be more noticable???
The inlet on the turbocharger is maybe 2" in diameter, the piping coming off the turbo is maybe 2.25" if you are lucky. What is a 70mm (near 3") throttle body at that point going to do honestly?
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cheez80
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i meant n15. damn
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