75 mm Throttle Body, Plenum, 90mm Maf

03fastgt · November 6th, 2011, 12:12 PM

I just got these parts for a steal used and wondering if I'll benefit from them and if it will run nicely. I've heard I need to change the injectors aswell to match it with the maf? I dont understand...

The car is being sprayed 125 shot....

Thanks

supermachone · November 6th, 2011, 12:23 PM

what else do you have done? usually basic bolt on GT's wont benefit from bigger throttle bodies, as they are designed more for forced induction, not naturally aspired engines because they do not provide the increased air flow the TB is designed for

and since nitrous isnt really forcing more air into your engine, im not sure it will benefit you much, especially because the FI isnt there all the time as compared to a super or turbo

correct me if im wrong though, i would have went with a 70mm

Jaa1456 · November 6th, 2011, 12:36 PM

Everything I have heard is not to go past a 70mm on a bolt on car.

03fastgt · November 6th, 2011, 12:58 PM

Yeah, maybe I'll just keep the parts on the shelf until I supercharge it.

Matt86 · November 6th, 2011, 03:06 PM

Id throw the plenum on now

Eagle2000GT · November 6th, 2011, 04:40 PM

The argument against the 75mm TB is the velocity vs. volume discussion. For high rpm cammed motor that might be a problem. But I've heard it not so much of a problem on basically stock cars. The 75mm TB/plenum will probably give you 2-3 rwhp and a lot of people report better throttle response with it. If you disconnect your battery before you start the swap, reconnect it when you are done, and let the motor idle for about 10-15 minutes, the ECU will relearn the new parameters.

The MAF will require a new tune and is of no benefit to you at this time. You stock MAF is good to around 360-370 rwhp.

bottled2v · November 6th, 2011, 04:46 PM

yeah dont throw the maf on, however might as well put on the tb/plenum. I have a 75mm on mine, sounds like a very similar setup, and i have zero issues.

Thunderscrash · November 6th, 2011, 04:52 PM

I did a plenum and cold air intake. Didnt really notice too much hp gains but my gas mileage went up about 3-4 mpg's

03fastgt · November 6th, 2011, 05:22 PM

Thanks guys,

Yea bottled2v we have pretty much the exact set up, except for the penguin in the trunk.

What gaskets will I need to install this? Looks like TPS and 2 other sensor spots, and the plenum---> intake gasket.

Just get them at the ford stealership?

bottled2v · November 6th, 2011, 05:34 PM

you can prolly get by with reusing your stock one as long as you dont rip/tear the iac or tps sensor gaskets. the plenum gasket should be fine also.

03fastgt · November 7th, 2011, 02:46 PM

I just put the throttle body and plenum on this morning and it runs as good or better than stock. After some acceleration testing I noticed a little more power around 4k rpm, may have lost some down lower though, but I could say there is some increase overall..
Thanks guys

November 6th, 2011, 12:12 PM	#1
03fastgt Regular Join Date: Oct 2011 Posts: 63 iTrader: 0 reviews	75 mm Throttle Body, Plenum, 90mm Maf I just got these parts for a steal used and wondering if I'll benefit from them and if it will run nicely. I've heard I need to change the injectors aswell to match it with the maf? I dont understand... The car is being sprayed 125 shot.... Thanks

November 6th, 2011, 12:23 PM	#2
supermachone Shake N' Bake 1984 Corvette Kessel Run @ Less Than 12 Parsecs Join Date: Sep 2007 Location: Kansas Posts: 5,076 iTrader: 2 reviews	what else do you have done? usually basic bolt on GT's wont benefit from bigger throttle bodies, as they are designed more for forced induction, not naturally aspired engines because they do not provide the increased air flow the TB is designed for and since nitrous isnt really forcing more air into your engine, im not sure it will benefit you much, especially because the FI isnt there all the time as compared to a super or turbo correct me if im wrong though, i would have went with a 70mm __________________ BONER CREW EMPLOYEE - PACKAGE INSPECTOR #1

November 6th, 2011, 03:06 PM	#5
Matt86 Hardcore Enthusiast 03 GT Join Date: Jan 2011 Location: GA Posts: 1,701 iTrader: 4 reviews	Id throw the plenum on now __________________ Vortech v2 si-TiAl Q- CXRacing- still need MAF

November 6th, 2011, 04:40 PM	#6
Eagle2000GT I Post Entirely Way Too Much 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 5,311 iTrader: 1 reviews	The argument against the 75mm TB is the velocity vs. volume discussion. For high rpm cammed motor that might be a problem. But I've heard it not so much of a problem on basically stock cars. The 75mm TB/plenum will probably give you 2-3 rwhp and a lot of people report better throttle response with it. If you disconnect your battery before you start the swap, reconnect it when you are done, and let the motor idle for about 10-15 minutes, the ECU will relearn the new parameters. The MAF will require a new tune and is of no benefit to you at this time. You stock MAF is good to around 360-370 rwhp. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage.

November 6th, 2011, 04:46 PM	#7
bottled2v Hardcore Enthusiast '00 gt, '95 gt, '83 lx 11.85@116 Join Date: Oct 2010 Location: Saginaw, mi Posts: 2,429 iTrader: 0 reviews	yeah dont throw the maf on, however might as well put on the tb/plenum. I have a 75mm on mine, sounds like a very similar setup, and i have zero issues. __________________ '00 GT, hp 292's, full bolt ons, built/stalled auto, 4.10's, 150 shot-new times to come. '95 GT, 347, tko, etc-11.8@116-sold. WTT-my mildly built 4r70 for t56/tko.

November 6th, 2011, 12:36 PM	#3
Jaa1456 Enthusiast 2000 GT Join Date: Aug 2011 Location: Central NJ Posts: 840 iTrader: 3 reviews	Everything I have heard is not to go past a 70mm on a bolt on car.

November 6th, 2011, 12:58 PM	#4
03fastgt Regular Join Date: Oct 2011 Posts: 63 iTrader: 0 reviews	Yeah, maybe I'll just keep the parts on the shelf until I supercharge it.

November 6th, 2011, 04:52 PM	#8
Thunderscrash Regular 2000 GT N/A Join Date: Oct 2010 Location: Delaware? Posts: 478 iTrader: 0 reviews	I did a plenum and cold air intake. Didnt really notice too much hp gains but my gas mileage went up about 3-4 mpg's

November 6th, 2011, 05:22 PM	#9
03fastgt Regular Join Date: Oct 2011 Posts: 63 iTrader: 0 reviews	Thanks guys, Yea bottled2v we have pretty much the exact set up, except for the penguin in the trunk. What gaskets will I need to install this? Looks like TPS and 2 other sensor spots, and the plenum---> intake gasket. Just get them at the ford stealership?

November 6th, 2011, 05:34 PM	#10
bottled2v Hardcore Enthusiast '00 gt, '95 gt, '83 lx 11.85@116 Join Date: Oct 2010 Location: Saginaw, mi Posts: 2,429 iTrader: 0 reviews	you can prolly get by with reusing your stock one as long as you dont rip/tear the iac or tps sensor gaskets. the plenum gasket should be fine also. __________________ '00 GT, hp 292's, full bolt ons, built/stalled auto, 4.10's, 150 shot-new times to come. '95 GT, 347, tko, etc-11.8@116-sold. WTT-my mildly built 4r70 for t56/tko.

November 7th, 2011, 02:46 PM	#11
03fastgt Regular Join Date: Oct 2011 Posts: 63 iTrader: 0 reviews	I just put the throttle body and plenum on this morning and it runs as good or better than stock. After some acceleration testing I noticed a little more power around 4k rpm, may have lost some down lower though, but I could say there is some increase overall.. Thanks guys Last edited by 03fastgt; November 24th, 2011 at 07:47 PM.

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