75mm Throttle Body

[Abbadon]

I was wondering if anyone can give me some insight about how to convert a mustangs throttle body to a 2g, with whats going to be etheir a bj's sheet meet intake or a magus, btw i have 272's along with a 20g, probably going to a 57trim or green here shortly as well. Anyone have any thoughts???

 

[phatTSi]

What do you mean by convert a ford tb to a 2g? Just buy a ford 75mm and buy the intake manifold that has that bolt pattern.

 

[Abbadon]

Your telling me that all the "tubes" because i dont want to get in to it, will hook up all the same??

 

[Waredtalontsi]

I hope you know that you are not going to see any performance gains out if it, unless you convert all your ic piping, and intake manifold to 75 mm.

 

[goofynick6]

I hope you know that you are not going to see any performance gains out if it, unless you convert all your ic piping, and intake manifold to 75 mm.

ANd you're basing this knowledge on?

oh yeah, nothing

 

[Lunch_Box]

I hope you know that you are not going to see any performance gains out if it, unless you convert all your ic piping, and intake manifold to 75 mm.

He already said that this was going to be going with a magnus or bjs intake mani.

 

[joeracer321]

You will also have to mod the throttle linkage. The mustang TB's use a snap on ball style cable. But I think Accufab makes a 75mm TB with the correct throttle cable linkage.

 

[jmc94gsx]

You have to rid your ISC (1gs for instance have to have the ECU reprogrammed), so discuss all the linkage and assembly section all you want to. THis is for big boost, high CFM setups which require a proper EMS...spelled out your setup will never require it.

 

[JMFabrications]

Just curious, which model of the Ford Accufab 75mm do you guys buy, the model for the 86-93 5.0 stangs or 96-04 4.6 stangs, they are 2 different part #'s....

Jim

 

[rdrkt]

4.6

 

[out there]

you should do a search on this to see what other people have posted about the experiences they've had. i think a lot of people had problems with the 75mm bbk and another brand... accufab seemed to be the best 75. the manufacturers were complaining about dsms being the only cars that the 75 can't stand up to, so...
i also found a couple of places where people were recommending 70mm.
if you do go with a 75 and it works out well for you, let us all know, because my next set of mods is going to be fmic, magnus intake and 70 or 75 (whichever tb i go with) piping everywhere... good luck

 

[JMFabrications]

I wasnt looking to purchase one yet, but I sell intake manifolds, you have the option to get it flanged for a Accufab 75mm TB, the flanges have been made for the 4.6l style, i didnt realize that the older 5.0 models may be used as well, but luckliy it seems that the 4.6l models are mainly used.

Thanks,
Jim
www.jmfabrications.com

 

[goofynick6]

Just curious what everyone does about idle air control and stuff like that when they goto a mustang TB...can any of it still be used?

Nick

 

[out there]

i hadn't looked into that very closely, but so far all the cars i've seen with 75mm tb's are already equipped with stand-alone systems.

 

[jott5555]

noticing that the stock 60mm 1g tbody is the major restriction in my setup im contemplated useing a 70mm or 75 accufab tbodie. now running dsmlink you can set your idle as most of us know also you canplay with the isc motor.

my question is how do you control the idle on the accufab unit. does it use the same design wiht a stepper motor to control the airflow. what i was thinking is why not use a tbodie with a tps and then manually set the tension on the cable so its at like 8% that way you dont even need worry about the isc ect..

just my .02

 

[Victory]

I just read the other day that one of the known contributors to these forms is going to be releasing TB's that bolt in to the DSM's. 74mm and 80mm. I think I saw 64mm there a well. Supposedly they are made of billet aluminum.

Anyways do a search.

It will be a long needed part once completed.

Scott

 

[JohnTSI]

You have to rid your ISC (1gs for instance have to have the ECU reprogrammed), so discuss all the linkage and assembly section all you want to. THis is for big boost, high CFM setups which require a proper EMS...spelled out your setup will never require it.

Please do not spread anymore misinformation.

You are not required to have your ecu reprogramed or to run a stand alone. Idle becomes controlled by the screw on the mustang TB and is further tweaked with fuel adjustments on your AFC or whatever fuel controller you are using. On my particular setup the ISC passages are blocked off with a plate and there is no ISC at all. Some with standalanes have had sucess using a ISC but its not required. You will have to make a linkage change, I just have a stock linkage welded onthe the accufab. You will have to wire in the mustang tps ur stock TPS will obviously not bolt on.

John

 

[goofynick6]

Not sure what voltage is required for a DSM, but in my experience Mustang TPS voltage ranges are from 0.5-1.0 volts.

Nick

 

[Tallen]

I hope you know that you are not going to see any performance gains out if it, unless you convert all your ic piping, and intake manifold to 75 mm.

The throttleplate acts as a restriction so it is better to have a larger TB than your piping.

 

[Hal]

The throttleplate acts as a restriction so it is better to have a larger TB than your piping.

Food for thought and some numbers to back this up:

A typical 1g throttle body has a 60mm bore @ the throttle plate.

That is "about" 2827 sq. mm in cross section (3.1416 * 30 * 30)

The 10mm throttle shaft has a cross section of "about" 600 sq mm (10 x 60)

Add to that the disruption in airflow cause by the plate edge.

Due to the dimensions of the casting, a 1g throttle body can be bored out to "about" 64mm.

This increases the cross section to "about" 3216 sq. mm (3.1416 * 32 * 32).

Hal

 

[Victory]

Hal is the one with the throttle bodies. Knew I read it somewhere.

Go to his homepage and his list of soon to be released products (Throttle Bodys) are listed.

Thanks for the input Hal. Keep everyone up to date on how they are coming.


Scott
Victory Performance Equipment

 

[PieTSI]

Throttle plate requirements taken from: A. Graham Bell, Forced Induction Performance Tuning.

Throttle Plate (mm) | Max Horsepower for Turbocharged cars

50 250
56 310
62 390
70 500
75 600
85 750
90 830
100 1000

 

[Car Cannibal]

I have a friend who machined mine to 66mm and took out the front half of the shaft. To get it to 66mm you need new bearings as the blade is much wider and reaches into the original bearings. This gives my TB a section of 3421 and then add on the shaft elimination of 600 for a whopping 4021

I am going to match the intake to the TB so that theres no restriction.

I did not want to use the 70 or 75mm and get stuck with a broken TB so I went this route.
It was way cheaper and will be made available after I dyno it.

I do not put much in those HP to TB mm numbers as there are many guys on here with the stock 60mm who have layed down over 500 to the wheel.

My buddy said that the furthest the stock 60mm could go without getting into the bearing was 63.2 mm. That means Extremes claims of 64mm are not accurate.

 

[definitiveno]

Do you have to buy a custom plate to fit the new bored out throttle body?



Sorry for newb question, I will go read vfaq



EDIT: nevermind. I just realized what the first picture was

 

[Hal]

You didn't drop 600 from the shaft mod, because you only took out one side.

The shaft measures about 4mm from the groove edge to the edge of the outside radius.

This means you only dropped about 240 sq. mm (4 * 60).

I've seen this mod done on carb equipped bikes and it's pretty effective. I don't think it's a good idea in our application because you just cut 50% of the strength out of the throttle shaft and took away a great deal of the throttle plate support.

Under boost, the intake charge is VERY dense. When you slam the throttle shut you are subjecting to shaft/plate to full boost (say 30 psi) plus the brief high pressure wave that builds just before the BOV opens.

That's why certain aftermarket bodes are breaking shafts.

I hope that new plate isn't aluminum. If so, you might find that it's going to fatigue and bend or that it rips right off of the mounting screws.

Since we're doing show and tell:

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