JDM Tuning Expert advice and discussion on JDM tuning for your S2000.

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Old May 14, 2008 | 09:26 PM
  #41  
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Originally Posted by s2kennmark,May 14 2008, 03:09 PM
are you sure it was the filter and not your tuning?


what nate was saying is, if you put the actual foam filter in the mouth of the horn where the velocity actually starts it can impede the flow of air thus lowering the pressure inside the stacks.... whereas putting it away from the horns so it can build pressure.

what i did when putting a screen in between the TB and horn doesnt impede the flow, because you already have air velocity going in, and with that much velocity, i dont think the screen will affect the air intake. your top mounted actually can impede velocity a little because you are blocking the flow on the mouth of the horn.

but to each is own... thats why we all setup differently based on personal preference and tuning.
nope, I removed the filters from that location and the power was there - no tune change in between- needless to say a screen allows more air than a filter.

if my tempura screens are impeding flow it must mean I have a super 2.2L - you've seen my dyno.

what nate's saying makes perfect sense to me.
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Old May 14, 2008 | 11:45 PM
  #42  
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yeah ive seen your dyno the first day your ITB was installed with my map and without the tempura screen.

did you dyno again? and yeah you have a really healthy engine when it wa dynoed.
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Old May 15, 2008 | 06:18 AM
  #43  
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errrr... that was the worst tuning the car has had, you know that

here: https://www.s2ki.com/forums/index.ph...&f=12&t=586286
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Old May 15, 2008 | 09:12 AM
  #44  
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i think your car dynoe'd at 235 on modacar's dynojet, with wheels on.... wheel hp.

dynapack is without wheel, thats axle hp.... and you got 232?

i dont think that was the worst tuning.... it pulled ok, but what do you expect on a couple hours of tuning?
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Old May 15, 2008 | 09:54 AM
  #45  
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I expected the car to run perfect when they said "it runs perfect" - where are you going with this again?
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Old May 15, 2008 | 10:30 AM
  #46  
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Originally Posted by alejo,May 15 2008, 09:54 AM
I expected the car to run perfect when they said "it runs perfect" - where are you going with this again?
no where


i just stated the fact that you had 235whp on the first day and you stated you had 232 axle hp with the tempura filter.

that's it... just want it clear.

and yeah i was expecting mine to run smooth as well after an hour of tuning, but i didnt expect it to be the perfect tune and run like it forever, we tuned it to be driveable and i drove it home then started tuning from there by myself.... and it's a never ending (almost neverending) task. you keep doing street tuning to get perfect tune with different weather changes.


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Old May 16, 2008 | 03:14 AM
  #47  
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Why no one recommends TWM ITB?
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Old May 16, 2008 | 05:10 AM
  #48  
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Originally Posted by s2kennmark,May 15 2008, 01:30 PM
no where


i just stated the fact that you had 235whp on the first day and you stated you had 232 axle hp with the tempura filter.

that's it... just want it clear.

and yeah i was expecting mine to run smooth as well after an hour of tuning, but i didnt expect it to be the perfect tune and run like it forever, we tuned it to be driveable and i drove it home then started tuning from there by myself.... and it's a never ending (almost neverending) task. you keep doing street tuning to get perfect tune with different weather changes.


Actually, after about 6 months, you can finally put away the laptop. I barely ever hook it up anymore, and when I do, whatever changes I make, I usually end up just putting it back where it was. It's been running "perfect" for a good while now
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Old May 16, 2008 | 05:26 AM
  #49  
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Originally Posted by 3r1k,May 16 2008, 06:14 AM
Why no one recommends TWM ITB?
Because TWM's are hard to tune due the fact that the FPR that comes with this is NOT vacuum responsive, thus cannot account for changes in MAP, the housings are all 1 piece, so if something breaks, you have to replace the whole unit, and nobody has really shown any real power increases over stock with them - mostly due to the much too short velocity stacks, and the shape and geometry of the runners.

Jenvey's velocity stacks AND runners are designed to be nozzles, with the shape of the jenvey's runner flattening out to a dual ellipsoid, basically shaping the air charge to aim directly towards the valves in the inlet ports, whereas the TWMs more or less are just a pipe the same dimensions as the intake ports, with a slight curvature to them. A straight pipe, or one with an angle of curvature of not less than 15 degrees per unit length, will have a velocity profile similar in shape to that of the front of a rounded pistol bullet. Velocity at the surface is zero, and increases at a parabolic rate to the midpoint in the pipe, then reverses and goes back to zero on the other side. This effectively reduces the mass of the air charge that is moving at max velocity. The Jenvey's nozzle shape will still have airflow velocity at 0 against the walls, but the shape forces the rest of the air stream to accelerate towards the exit, making the velocity profile much sharper, more like the shape of the front of a rifle bullet.

The difference in repeated performance differences between the 2 kits really shows which company took the time to "engineer" their kit, and which one just "designed" their kit.
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Old May 16, 2008 | 08:54 AM
  #50  
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Originally Posted by wildcardtrd,May 16 2008, 05:10 AM
Actually, after about 6 months, you can finally put away the laptop. I barely ever hook it up anymore, and when I do, whatever changes I make, I usually end up just putting it back where it was. It's been running "perfect" for a good while now
hehe yeah, mine's been running good since last year... what i meant by never ending is, i tend to play with different modules... one at a time. also with different weather here in norcal, i had to make a map that will adapt quickly though the air temp compensation settings

and since gas is so high, i have been doing some "gas saving" tune for daily driving while keeping the powerband.... i just love to tinker with it. but now i think this is the best tune ive had... well, until i find other things.
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