Throttle Body Size

[HellOnWheels]

What should depict when a larger throttle body be used, turbo size, intercooler size, head flow, etc....

HOW

 

[BoostKillsStres]

I don't think anyone's ever done back to back TB tests to see what if much is gained, at least not that I've ever read on the boards. I think it mostly comes down to people seeing it as the next most likely potential cork in the system thats the next cheapest bolt on part to go after.

 

[Ttype6]

The first thing any turbo regal should have is a 70 mm. throttle body,Precision's upper plenum,and an RJC Racing's air distribution power plate. You need to buy all of these things as a package. In order for a regal with a stock intercooler and throttle body to see 17 lbs.of boost in the intake manifold,the turbo has to make 20-21 lbs. of boost. The boost will drop 4-5 lbs. as it travels from the turbo to the intake,because of the restriction created by the I.C. and T.B. When you install the 70 mm. T.B. you will see a 2 lb. increase in boost which is proof of the restriction. You will then be able to run more boost at any given octain rating,or you could adjust the boost back to where it was and enjoy the bennefits of a cooler dencer air charge. Since the turbo will then only have to make 18-19 lbs.of boost for the intake to see 17 lbs., the air charge wont get heated as much. Both of these options will make more power.

 

[MistaScott]

I disagree. The first thing these cars should have is a fuel system upgrade and a scanmaster. The larger throttle body provides limited gains but is a good addition to an upgraded intake with ported heads. The power plate is primarily for reducing knock due to uneven air distribution to the cylinders, not horsepower explicitly (though reducing knock increases horsepower by definition).

 

[MaxVO2]

Well, opinions vary on what every turbo regal should have done first, and that's why there's chocolate and vanilla. It all depends upon what you want to do with the car.

Perhaps the VERY first thing any turbo regal needs is a big Holley Dominator carb on a custom made sheet metal intake, coming out from a hole cut in the hood. My neighbors son just put one of these onto his normally aspirated V6 Camaro RS. The car is black, and now so is the exhaust..

I've never seen any back to back comparisons showing any difference in performance between 58, 62, 65, 70mm throttle bodies on anything slower than a low 11 sec car. I think the subject has been hashed to death.

I personally think the VERY first thing you should do to any turbo regal is to put in a kill switch so you can keep the car. But that's just me.

Billy
Montgomery Village, MD

 

[Ormand]

I would like to see the tests that showed a 2 lb increase in boost from changing the throttle body. This only a 231 cubic inch engine. It does NOT need a throttle body as big as a BB chevy. No matter how much you raise the boost, it is still only 231 cubic inches, and the air flow is only going to be 400 cfm or so. It may be 400 cfm of DENSE air, if you have lots of boost and a good IC, but flow velocity and pressure drop are not as dependent on density as on volume. Guess it's that "Vsquared" term in all the flow equations. The IC, on the other hand, is a known restriction. If the stock IC were replaced with big neck, at the same time the throttle body, up pipe, and plenum were swapped out, then the increase in boost would seem more reasonable.

 

[Nick Micale]

Originally posted by BoostKillsStres
I don't think anyone's ever done back to back TB tests to see what if much is gained, at least not that I've ever read on the boards. ................r.

I have done this and posted my results a few times.

My car was a consistant 11.1-11.2 at the time. Went from 70mm to 62mm to stock with no change in performance.

Have known of 11 and 12 sec. cars not running as good with a 70mm as with stock TB.

 

[FWD turbo]

Originally posted by Nick Micale


Have known of 11 and 12 sec. cars not running as good with a 70mm as with stock TB.

Do you have a theory as to why this is the case?

I have been considering getting my throttle body ported, but never really knew what difference it would make. I certainly don't want to do anything that would reduce the performance of my car. Perhaps the stock throttle body is is more than adequate?

 

[turbo2nr]

Well, PTE now makes 3" piping for the front mount IC, so i see no problem in adding a TB of equal size. I like the Kenne Bell unit (one of the only KB parts I like), it is only $300 for TB and plenum. Sure, it is a little eye candy as well. Looks great with other polished pieces. I polished my stock valve covers, and compressor housing, looks great to me.


3" piping.....3"Throttle body. Makes sense to me.

 

[FastRegalWE2]

I just bought that combo, TE61, polished 70mm TB, Precision plenum, RJC PP, ported heads, ported intake, 204/214 cam, PTE FMIC with 3" piping....hope it works ok with the 70mm, I wouldnt want to have to take it back off for a stocker

 

[turbo2nr]

You need to join us guys from VA/MD for the next track rental at Budds Creek. Talk to Red. I got 11.1 with that combo, stock block/heads/cam/suspension. I was happy with the little I have done.

 

[FastRegalWE2]

as a matter of fact, the heads/intake I have came off Reds car, the ones he went 10.41 with, but now they have big valves too
I am hoping fo ra 10.9x-10.8x
my rear stuff for launch is
boxed lowers, ATR bar, Pro Stars, MT ET DR's, dual airbags, springs,soft shoes and big wheel cylinders, TA Girdle
hoping for some 1.5 60's

 

[REDS HOT AIR]

Originally posted by Ormand
This only a 231 cubic inch engine. It does NOT need a throttle body as big as a BB chevy. No matter how much you raise the boost, it is still only 231 cubic inches, and the air flow is only going to be 400 cfm or so.

your thinking totally wrong

231 ci is how much volume there is in all 6 cylinders

231 ci is how much air the motor would consume n/a at 100% ve

now if you force twice the normal amount of air in the motor you are then feeding a 462 ci motor as far as air volume


my ears are burning someones talking about me

 

[turbo2nr]

ummm, dat rite!

 

[FastRegalWE2]

Originally posted by turbo2nr
You need to join us guys from VA/MD for the next track rental at Budds Creek. Talk to Red. I got 11.1 with that combo, stock block/heads/cam/suspension. I was happy with the little I have done.

How much boost?
I am planning on setting up my Bstc to run 20 normally, BstC off, then dual solenoids to be able to crank it up to 30 if I need to

 

[turbo2nr]

i got an 11.1 with 29lb boost. Turbo is done around there. I tried a little higher, but no help.

 

[FastRegalWE2]

nice, 29#'s on a stock engine......
crap, we are hijacking this guys thread


SORRY

 

[Ttype6]

Originally posted by ws6formula50
I just bought that combo, TE61, polished 70mm TB, Precision plenum, RJC PP, hope it works ok with the 70mm, I wouldnt want to have to take it back off for a stocker

It'll work great. Again, my Kenne-Bell 70mm. TB. installation netted a 2lb. increase in boost. Iwas controlling boost manualy. Back in 95'-96' Ken Duttweiler installed a Kenne-Bell 70mm. and upper plenum on a turbo Buick. At 13 lbs. of boost ,horsepower went up from 507 to 537. Torque went up from 528 to568. This motor did,however make 740 hp and 784 lbs./ft of torque at 25 lbs. of boost. The point is that even at 13 lbs. the stock throttle body was a restriction. When,in my earlier reply, I stated that the 70 mm. is the first thing any turbo regal needs,I ment to say that even a stocker,with an ample fuel supply, can bennefit from this. P.S. I wonder what would have happened if Duttweiler would have put the stock T.B. back on and pulled another dyno run?

 

[turbo2nr]

The polished TBs, and plenums look great, even if they don't do squat. But, I think running 30psi, and 3" IC piping, the 70mm. TB is bound to be helping. Why make the charge squeeze down to 58mm at the last minute?

As far as seeing more boost, I doubt it., But I have never done any real testing.

 

[ThikStik]

Originally posted by Ttype6
It'll work great. Again, my Kenne-Bell 70mm. TB. installation netted a 2lb. increase in boost. Iwas controlling boost manualy. Back in 95'-96' Ken Duttweiler installed a Kenne-Bell 70mm. and upper plenum on a turbo Buick. At 13 lbs. of boost ,horsepower went up from 507 to 537. Torque went up from 528 to568. This motor did,however make 740 hp and 784 lbs./ft of torque at 25 lbs. of boost. The point is that even at 13 lbs. the stock throttle body was a restriction. When,in my earlier reply, I stated that the 70 mm. is the first thing any turbo regal needs,I ment to say that even a stocker,with an ample fuel supply, can bennefit from this. P.S. I wonder what would have happened if Duttweiler would have put the stock T.B. back on and pulled another dyno run?

My stock TB is very free flowing. Even after getting new seals , the air flows very freely past the shaft .