65mm T.B. user input
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From: San Elijo Hills, Ca.
65mm Throttle Body user input
Hello-
I am thinknig about getting a 65mm Throttle Body.
Since this is my daily driver, I would like to ask a few questions that are not power-performance related, as we know/heard of all the great throtle response & extra power the larger t.b. provides.
1. Did your idle speed change when cold/hot compared to oem? If so, could you describe it.
2. How is the idle quality? consistant/inconsistant? For example when your slowing down for a stop light & you get off the gas & press on the clutch.
3. Knowing what you've experience with a 65mm TB, would you buy 1 again?
Thanks
I am thinknig about getting a 65mm Throttle Body.
Since this is my daily driver, I would like to ask a few questions that are not power-performance related, as we know/heard of all the great throtle response & extra power the larger t.b. provides.
1. Did your idle speed change when cold/hot compared to oem? If so, could you describe it.
2. How is the idle quality? consistant/inconsistant? For example when your slowing down for a stop light & you get off the gas & press on the clutch.
3. Knowing what you've experience with a 65mm TB, would you buy 1 again?
Thanks
Last edited by Aby@MIL.SPEC; Feb 8, 2006 at 10:27 AM.
Thread Starter
Former Sponsor
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From: San Elijo Hills, Ca.
Originally Posted by nutrulz
Just got it from works, Here in Reno, it's middle of winter, so I expected some drivability issues, but there were none. Other than a little kick in the pants, it is equal to stock.
Being that your the only 65mm t.b. user to offer their input.
Hello-
I am thinknig about getting a 65mm Throttle Body.
Since this is my daily driver, I would like to ask a few questions that are not power-performance related, as we know/heard of all the great throtle response & extra power the larger t.b. provides.
1. Did your idle speed change when cold/hot compared to oem? If so, could you describe it. No the TPS and screw are adjusted
2. How is the idle quality? consistant/inconsistant? For example when your slowing down for a stop light & you get off the gas & press on the clutch. 100% stock
3. Knowing what you've experience with a 65mm TB, would you buy 1 again?
Of course why not?
Thanks
I am thinknig about getting a 65mm Throttle Body.
Since this is my daily driver, I would like to ask a few questions that are not power-performance related, as we know/heard of all the great throtle response & extra power the larger t.b. provides.
1. Did your idle speed change when cold/hot compared to oem? If so, could you describe it. No the TPS and screw are adjusted
2. How is the idle quality? consistant/inconsistant? For example when your slowing down for a stop light & you get off the gas & press on the clutch. 100% stock
3. Knowing what you've experience with a 65mm TB, would you buy 1 again?
Of course why not?
Thanks
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Originally Posted by WOT
. . . as we know/heard of all the great throtle response & extra power the larger t.b. provides.
More significantly and more noticeably is the difference in throttle response, because more air is moving through the throttle body at a smaller throttle angle. This effectively reduces the pedal travel from idle to WOT.
The 80mm TB mentioned above is too large, and won't make more power than a 65mm unit on a 2.0L engine. The trouble with a TB that is too large is the difficulty of controlling part throttle makes a twitchy pedal at steady cruise, which demands constant attention (which gets tiresome). Also, since the airflow used by the motor is smaller than what a very large TB can flow, WOT is reached at maybe 50% pedal travel, which leaves the bottom 50% useless. Likewise, it throws off the TPS signal, because WOT is reached before the sensor reaches the WOT threshold signal. 65mm TBs proving to be plenty for 600hp EVOs and 700hp Ford 2.7Ls. Bigger is not always better.
Just FYI.
Last edited by Ted B; Feb 10, 2006 at 10:09 AM.
Originally Posted by Ted B
Don't bank on all the 'extra power'. What stands to be gained there is purely a factor of the power level of the engine.
More significantly and more noticeably is the difference in throttle response, because more air is moving through the throttle body at a smaller throttle angle. This effectively reduces the pedal travel from idle to WOT.
The 80mm MAF mentioned above is too large, and won't make more power than a 65mm unit on a 2.0L engine. The trouble with a TB that is too large is the difficulty of controlling part throttle makes a twitchy pedal at steady cruise, which demands constant attention (which gets tiresome). Also, since the airflow used by the motor is smaller than what a very large TB can flow, WOT is reached at maybe 50% pedal travel, which leaves the bottom 50% useless. Likewise, it throws off the TPS signal, because WOT is reached before the sensor reaches the WOT threshold signal. 65mm TBs proving to be plenty for 600hp EVOs and 700hp Ford 2.7Ls. Bigger is not always better.
Just FYI.
More significantly and more noticeably is the difference in throttle response, because more air is moving through the throttle body at a smaller throttle angle. This effectively reduces the pedal travel from idle to WOT.
The 80mm MAF mentioned above is too large, and won't make more power than a 65mm unit on a 2.0L engine. The trouble with a TB that is too large is the difficulty of controlling part throttle makes a twitchy pedal at steady cruise, which demands constant attention (which gets tiresome). Also, since the airflow used by the motor is smaller than what a very large TB can flow, WOT is reached at maybe 50% pedal travel, which leaves the bottom 50% useless. Likewise, it throws off the TPS signal, because WOT is reached before the sensor reaches the WOT threshold signal. 65mm TBs proving to be plenty for 600hp EVOs and 700hp Ford 2.7Ls. Bigger is not always better.
Just FYI.
2) I use MAP not MAF
3) If 80mm are way to big and is no good. How come the worlds #1 Evo tuner JUN Auto in Japan use it?
1) 2.0L vs. 2.2L = 10% difference. 80mm vs 65mm = 51% difference in total area.
2) That was a typo (corrected)
3) JUN's 80mm TB is unecessary even for their 600whp EVO, which makes it not the best idea for the vast majority of persons here (300-400whp daily drivers), especially since several persons here have demonstrated even more power than JUN, and use a 65mm TB.
I illustrated the fact that there is a point whereby going bigger is not better for more than one reason, simply put.
2) That was a typo (corrected)
3) JUN's 80mm TB is unecessary even for their 600whp EVO, which makes it not the best idea for the vast majority of persons here (300-400whp daily drivers), especially since several persons here have demonstrated even more power than JUN, and use a 65mm TB.
I illustrated the fact that there is a point whereby going bigger is not better for more than one reason, simply put.
well I have a works 65mm throttle body and I have idle issues. Although my car isn't tuned anymore even when it was I had the same problem. I spoke with works and they said my problem was from a vaccum leak. Well I can't seem to find any vaccum leaks so I figure it's the throttle body. Here's my problem when you start the car it runs fine it warms up at 1400rpms right around there I think. But once it's warmed up heres the problem. When you let off the gas say to come to a stop at a stop sign the idle comes down really slow from 2000rpm to 900rpm thats as low as it will go. After a few seconds of idling at 900rpm the rpms will climb to 1400rpm and then back down to 900rpm. Has anyone had this problem or does anyone have any suggestions. I'm goona have Al do a custom road tune in march and I don't know if it's a tune issue or is it something I need to fix. Any help would be great
the t/b can get warped a little if you over torque the 4 bolts or put a vband clamp on it to tight. it basically makes the plate rub the bore and catch. i'm not sure how you can fix it, but you can maybe get it bored slightly.
