new Throttle Body and Upper Plenum

ryno_11 · Apr 13, 2007

i want to install new Throttle Body 75mm and Upper Plenum is there and other mods i need to make to get these to work properly?? like incress size of my injector? is i do incress the injectors what size would you recommend over my stock size..??? thanks alot.

98gtblue · Apr 13, 2007

No need for bigger injectors with just TB/Plenum upgrade. Maybe just a cold air intake. What brand you thinking about?

Kilgore Trout · Apr 13, 2007

TB and plenum should be one of the last bolt ons you do. What are you current mods? If you change injectors you must get the car re-tuned.

mustang gt 2003 · Apr 13, 2007

Kilgore Trout said:
TB and plenum should be one of the last bolt ons you do. What are you current mods? If you change injectors you must get the car re-tuned.

why should TB and plenum be one of the last bolt ons? Do you mean after headers, midpipe, and cat back.... along with cold air intake? Or even after others??

CobraRed_96_GT · Apr 13, 2007

mustang gt 2003 said:
why should TB and plenum be one of the last bolt ons? Do you mean after headers, midpipe, and cat back.... along with cold air intake? Or even after others??

even after others, it's really a support mod that will be useful when needed. Just cuz it can offer another 120CFm doesnt mean your car will use it. It's really a nessesary mod for anyone running a mongoose kit or other centri blower

'03GTinFLA · Apr 14, 2007

I kinda did my N/A mods in order of what I felt I could tackle, weekend mechanic, and what I could afford at the time. With that being said, everything mentioned from the others above is true. TB/Plenum was my second mod after K&N cold air kit and I didn't feel much from either, again from what was said above. BUT, if you plan on doing full exhaust and the other N/A mods when your ready/can afford them, then get that TB/Plenum on there and keep saving. It all adds up. It's a pretty easy swap. I'm sure there are write ups on here and advise about high idle after the swap.
Good luck mang and let us know how it goes.

MarcoCapone · Apr 14, 2007

IMO...do what ever you want in any order you want... because anyways if we start to listen to everything people say, bolt-on are useless on a GT....Well this must be the reason why bolt-on GT kick my stock GT's ass so bad.....

Dragstr05 · Apr 14, 2007

MarcoCapone said:
IMO...do what ever you want in any order you want... because anyways if we start to listen to everything people say, bolt-on are useless on a GT....Well this must be the reason why bolt-on GT kick my stock GT's ass so bad.....

People recommend an "order" because starting from a stock GT, some mods are more usefull than others. It's like when I got my catback - it costed twice as much as my midpipe but gave no performance gain. The midpipe on the other hand has helped me to pull on many stock GT's and is one of the cheapest, best bang for the buck mods you can do.

Seraphitia102 · Apr 14, 2007

MarcoCapone said:
IMO...do what ever you want in any order you want... because anyways if we start to listen to everything people say, bolt-on are useless on a GT....Well this must be the reason why bolt-on GT kick my stock GT's ass so bad.....

I'm not sure if I understood a word of that

but yeah, modding is fun and expensive. i believe there are better things with more priority to get, but hey, one new part is one new part. not that I would probably feel a SOTP difference with a TB/plenum combination, but it could have the "placebo" effect that if I think I have that extra horsepower, I might feel that I'm going a bit faster That's how I thought when I popped in a CAI.

ryno_11 · Apr 14, 2007

thanks guys

thanks for the tips the more information the better i kind of new at this stuff .. so you think maybe headers and a cold air intake would be a better way to start off... a question about headers what's the diff between short adn long tube?? anywanys thanks again i'm open to suggestion..

Kilgore Trout · Apr 14, 2007

Good first mod would be catback, shifter, or handheld engine programmer.

topless98gt · Apr 14, 2007

MarcoCapone said:
IMO...do what ever you want in any order you want... because anyways if we start to listen to everything people say, bolt-on are useless on a GT....Well this must be the reason why bolt-on GT kick my stock GT's ass so bad.....

?!!?!?!?!!!?!?!?

Sorry...I had to I promise, I'll try to make this the last time.

My first real mod was a mid-pipe. Then I got gears, then my catback, and my shifter <3 teh MGW!

I seriously TRIED to break/bend the MGW the other day, and all I did was hurt my wrist. That thing is fxcking SOLID.

topless98gt · Apr 14, 2007

ryno_11 said:
thanks for the tips the more information the better i kind of new at this stuff .. so you think maybe headers and a cold air intake would be a better way to start off... a question about headers what's the diff between short adn long tube?? anywanys thanks again i'm open to suggestion..

Shorties combine into the collector much earlier than the long tubes. The longer it takes for the cylinder pipes to come together in the collector, the less back pressure.

At least that's how I understand it...

BurningRubber · Apr 15, 2007

Shorties net less gains than longtubes, and for the pain in the ass to install headers on a 4.6 to begin with go longtubes and do it right the first time.

merc123 · Apr 16, 2007

You should be goot with the 75MM tb and no need to increase injectors or anything. Also, make sure you unhook your battery for about 30 minutes so your computer can reset to compensate for the new stuff.

mustang gt 2003 · Apr 16, 2007

merc123 said:
You should be goot with the 75MM tb and no need to increase injectors or anything. Also, make sure you unhook your battery for about 30 minutes so your computer can reset to compensate for the new stuff.

Should you do that when you install new headers and a mid pipe too? Or should you go and get it re-tuned? Im asking because in a month or so im finishing off the intake with a TB and Plenum, then doing headers and midpipe. I already have the magnapack catback exhaust on.

04DarkShadowGT · Apr 17, 2007

Kilgore Trout said:
Good first mod would be catback, shifter, or handheld engine programmer.

You get just as much power from a TB and Plenum than a catback exhaust, if not more.

merc123 · Apr 17, 2007

mustang gt 2003 said:
Should you do that when you install new headers and a mid pipe too? Or should you go and get it re-tuned? Im asking because in a month or so im finishing off the intake with a TB and Plenum, then doing headers and midpipe. I already have the magnapack catback exhaust on.

I was told that if I did headers there could be a benefit to a dyno tune but for $595 I couldn't justify doing it.

topless98gt · Apr 17, 2007

merc123 said:
I was told that if I did headers there could be a benefit to a dyno tune but for $595 I couldn't justify doing it.

Only $595 for GOOD headers?! I'll be lucky if I spend less than $700 on headers, mang. That's in the long run though.

merc123 · Apr 18, 2007

I wish it was $595 for headers. Try $595 for the tune.

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