a50sn95 said:Personally, I don't understand the whole "too large" issue with the TB. I don't think there is such a thing. Yeah, it may alter the way the car behaves, but I think it's something you have to adjust for. To me, you are just removing restriction by going to a larger TB. Of course, you have to have a way to adjust for it (Like a Tweecer...), so this is probably why there are so many issues with larger TB on our cars.
Anyway, just my .02.....
Dennis
5spd GT said:Cman - What was the time period between your 95mph run and your 99mph run?
I have gained 3mph with no actual changes
Zero Signal said:First, if the TB is larger than the intake opening, you create a really bad restriction there by killing any laminar flow.
Zero Signal said:Think of it this way . . . suppose your engine could run without any intake tube or ANYTHING attached to the intake plenum.
It would go full throttle. It'd run fine, just out of control....Zero Signal said:How well do you think it will flow with nothing attached to that open hole?
Okay, even if I agree here, my 75mm TB WILL control the direction of airflow, just like a 60mm will, so I don't see how this is relevant.Zero Signal said:It will flow terribly without something to controll the direction of the airflow and keep it close to laminar.
Zero Signal said:Second, if you overdo the TB size, you loose a lot of air velocity coming through there and the flow gets killed by turbulence again.
i have to disagree also. when i was first starting to mod the car, i had the gt40 intake with the ported lower, bbk 70mm t/b, cold air kit, pullies, unequal shorties, o/r h-pipe, and flows. i put down 230.2hp and 293.2lb/ft at the wheels. that was with the stock heads, cam, maf, and eec. considering our cars made about 175hp at the wheels in stock form, that is quite an increase in power. im not saying that a 65mm t/b wouldnt be better suited for what i had, but the 70 definitely isnt too big for what he is using it for. by the way, i didnt really feel a SOTP gain either after a couple of my mods. you really need to do a few at once in order to really feel a power increase.94GTLaserRC said:Too large of TB without enough supporting power mods.
RC
how do you check?xkuntrycowboyx said:IF you changed ur TB... make sure ur TPS is set right, theres articles about that, but i think it's 0.97 v ...i forget tho
a50sn95 said:Yep, you're right. I'd hope that someone installing a bigger TB would check this port mismatch, but I guess since I didn't spell it out, I gotta say you got me on this one.
a50sn95 said:Diesels Do. They control engine speed with fuel.
a50sn95 said:It would go full throttle. It'd run fine, just out of control....
a50sn95 said:Okay, even if I agree here, my 75mm TB WILL control the direction of airflow, just like a 60mm will, so I don't see how this is relevant.
a50sn95 said:Hmm. I don't see how. The engine is capable of pulling ALOT of air in. I think of those 8 pistons going down the bore, and then the little opening even a 75mm tb allows, and don't see how it can matter that much.
I think it will let a LITTLE more air in, but it should be able to be compensated for.
Anyway, I run a 75 (Of course I'm boosted) and have no issues with drivability that I blame on the TB. (Maybe the aluminum flywheel and the 2.73's...)
Green 94 5.0 said:i have to disagree also. when i was first starting to mod the car, i had the gt40 intake with the ported lower, bbk 70mm t/b, cold air kit, pullies, unequal shorties, o/r h-pipe, and flows. i put down 230.2hp and 293.2lb/ft at the wheels. that was with the stock heads, cam, maf, and eec. considering our cars made about 175hp at the wheels in stock form, that is quite an increase in power. im not saying that a 65mm t/b wouldnt be better suited for what i had, but the 70 definitely isnt too big for what he is using it for. by the way, i didnt really feel a SOTP gain either after a couple of my mods. you really need to do a few at once in order to really feel a power increase.
Well, my break in period for gears was the time it took the lower the lift, drive onto some good pavement, and run the living dog crap out of my car. Gears are either right or wrong, there should be no break in period. It would be wise of course to make sure you don't have any leaks after a bit of driving. If they grind, they will most likely need adjustment. I have heard a few guys say they made noise for a few hundred miles then it went away, so I guess there are some exceptions.xkuntrycowboyx said:also, i believe its been said on here there's a break in period for gears?? am i right guys?
i wasnt trying to say those numbers were because of the throttle body. for all i know, the throttle body may not have added much power at all. the only true way to tell would have been to do a before and after comparison on the dyno. the only dyno comparison i have was n/a (230.2hp 293.2lb/ft) with the mods i listed and with a zex nitrous kit jetted for 75hp (280.8hp 361.7lb/ft) in which both runs were made during the same dyno session. what i was trying to say was that i dont think the size of the throttle body had a negative effect on performance with the mods i had. so it seems we are in agreement there.5spd GT said:The stock cars dyno a bit higher than 175rwhp. Also you other mods can contribute to that power. Just because a throttle body is "in the mix" doesn't mean it contributed to those "high numbers". I don't think a 70mm TB hurt you though in that particular case.
94MustangGT5.0 said:The only thing I have to add about the TB argument is this: Why not upgrade the TB while you are replacing the intake? Maybe it's not going to yield the highest amount of HP for the $ at the time, but it sure won't hurt anything. I find it asinine to put on an intake with a 70 or 75mm opening (to increase air flow), then re-attach an air limiting 60mm TB. BTW... not trying to put down anyones theory, I just wanted to express my own.
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