1ROTOR2NV

Hey guys researched flow characteristics on everything from the intercooler pipes, to the intercooler to the upper and lower intake manifolds. I am aware of the aftermarket throttle bodies as well as some companies that basically port the stock ones for the FD but there is no real hard numbers to go along with them. Does anyonw have any experience with throttle bodies and what gains can be had, or should I just stick with the stock one. I will be running a 500R from ASpec,let me know.

silverfdturbo6port

iTrader: (26)

On my single turbo second gen i had a single throttle body that was around 120mm. i love it!!! it was easy to set idle, i did suffer from the bottom end but i built the motor to have a high power band the top end was noticeable different with the single throttle body in my opinion but i could have been dreaming lol

kenn_chan

How can you claim to have done this and yet in a seperate post start asking questions about the differances between a T3 and a T4 spool characteristics? i think before you start posting pipe dreams and/or crap you read off of an internet site somewhere you should think twice and then maybe post

to the OP look at this thread and then decide upon the content that this guy posted.

https://www.rx7club.com/single-turbo-rx-7s-23/t3-t4-811847/

that being said:

gains in flow can be had with a larger throttle body, however the biggest bottle neck in a turbo rotary is usually the turbine wheel size, or housing a/r. I think you should talk with the guys at A spec as they are knowledgable and very helpful.

cheers

kenn

I am talking in general with T4 footprint turbines, once you jump up to a t6 footprint all that goes out the window and then you really need to worry about all of the rest

SENZA PARI

120mm is basically 5"... seems a bit large, what sort of power are you putting down?

The gains with going to larger/single TB are small unless coupled with a new intake manifold altogether to fully take advantage of flow.

Busted7

5'' is good for about 2500.00 h/p on a turbo v/8 so it should work on a rotary!

1ROTOR2NV

Anyone upgrade to the feed or knightsport throttle bodies with a t4 footprint and notice any gains ???

darkphantom

iTrader: (2)

from what ive seen quicker throttle response, quicker spool AND MAYBE 5hp

your hp curve will take longer to do down though!

.
and from experience the 13bre cosmo throttle body is alot better than the 13bre-w which is the one i have on my car!

dznutzuk

iTrader: (1)

The 13bre cosmo throttle body is smaller than the fd's 13brew

rx7raca

This thread has changed topic to many times.

Lets start from the basics. How much whp are you planning on running?

Under 500whp? Stock manifolds and throttle body will be fine, only because the gains aren't, IMO worth the extra money for a whole new intake system...

If your looking to get the best flow out of the stock system and saving tons. Look into removing butterfly flaps and smoothing out the throttle body's rough edges.

I could be wrong with all of this, but its an opinion from someone with no money my 2 cents

silverfdturbo6port

iTrader: (26)

well i dont know why you guys are so rude i ask questions about turbos ect to get answers dont know why thats so bad????really my last set up was a garbage ebay t70 so thats why i ask about turbos so i can buy a name brand this time, so get your story right!!!!!! just because i ask questions does not mean i dont know anything.. and as for the throttle bodie i can give you pics if it makes you feel better but i was wrong on the size tho it was around 80mm not sure tho it was a 3 1/2 inch inlet.

SENZA PARI

I don't know who was being rude other than kenn chan maybe... ? And there's nothing wrong with asking questions, how do we get anywhere if we don't?
No pics of your TB wont make anyone feel better, we all knew it wasn't 120mm.

darkphantom

iTrader: (2)

it flowed more better. i got the proof! so it obviously did something right

silverfdturbo6port

iTrader: (26)

i didnt do any dyno runs with it but i did notice a difference driving. i found my idea in one of my hyperrev magazines by some guy in japan so i did it to experiment a little bit i built my adapter out of 3/4" thick aluminum

ls2

iTrader: (2)

where can I buy larger throttle bodies

silverfdturbo6port

iTrader: (26)

search ebay or other sites for a supra or skyline throttle body a 5.0 mustang one works also just be prepared that things will have to be custom made to make it work

pmr eng

Under atmospheric conditions (or not on boost) there is a large air flow difference between larger TB's and smaller TB's
Smaller TB's tend to have better throttle response and torque at lower revs and larger TB's better top end power and torque at higher revs

Here are some airflow ratings for different sized TB's
http://www.accufabracing.com/Flow%20Data.htm

Under boost the difference is minimal, because airflow is governed by the airflow from the turbocharger

skir2222

What would have to be done to fit a larger throttle body like a 5.0 styled one?

silverfdturbo6port

iTrader: (26)

i made a plate out of aluminum i can make another one if your interested but be aware when one big butterfly opens unlike the smooth transition of three you get just a bunch of air rushing in all of a sudden and you may get a hickup out of it

skir2222

Yea, I understand there will be much more flow faster then the stock tb. I am actually very interested in doing this.

So you just need a adapter plater then bolt it up hook up the throttle cable, what about the tps sensor, and whatever other sensors are required?

GoodfellaFD3S

iTrader: (213)

This is what I was thinking as well. For a boosted car, i'm not sure it's worth spending the money, especially if driveability suffers.....and this is coming from a guy who's dumped boatloads of money into his FD, and used to cruise around in thick BDUs in the Texas summers with deleted a/c

skir2222

Would be cool if someone did flow testing data with the 13bt, 13brew, and the 13bre manifolds and throttle bodies so we can all see the difference in flow and capabilities of each part.

cewrx7r1

iTrader: (2)

The stock FD TB can be improved with a Dremel tool, JB Weld, large drill, and six flat head screws. Only requires a little bit of one day, about $10, and a little imagination of what would help reduce turbulence and increase air flow.
Only for those fanatics who are willing to spend more time for that little last bit of power.

Replace the stock throttle plate screws with flatheads that do not stick out into the air flow. Removing the old ones is the hard part, best to drill out their centers with a small drill which will loosen them up.

Grind away on the throttle stop arm to allow the secondary throttle plates to open 100%. The primary will over rotate a little but it is better than before with both larger secondaries being more under rotated.

Fill in the large port for the AWS solenoid with JB Weld and sand down to the same counter of the surrounding area.

For those not using the thermal wax rod unit. Cut away the protrusion for it's water duct, fill with JB Weld, and contour it.

All of these will slightly reduce turbulence in the TB.

silverfdturbo6port

iTrader: (26)

I agree with the FD tb mod its easier and you wont get any suffering. when i did the single TB i made the adapter plate and then i had to make a linkage set up. the ford Tb's have the same style TPS sensor so the TPS bolts right in so at least that portion is easy