Bigger Throttle Body !!!

[JG911]

As you all know i have a standard 1984 3.2 carrera i was just wondering if i put a bigger throttle body on would i gain anythink

I think it a 66mm bore and it says flows 10% more air

[ChrisBennet]

I doubt you'd see much difference, maybe a little less torque at lower RPM's....
-Chris

[David]

When I overbuilt my 280Z, the least bang for the buck was a bigger throttle body.

From an engineering standpoint flow is not limited until you reach sonic velocity and I'm sure you're not. A small TB is just more head loss, not a restriction. For that extra flow at high rpm and WOT, you're giving up flow control at low rpm. BTW, I'm making 475rwhp with a stock Carrera TB.

[rgdalacrity]

Yes, you would experience a difference in performance if you couple it with an updated exhaust system, throttle adjustment, performance chip and no smog equipment all well worth the time, money, and effort. Another benefit is your engine will run cooler and adhere to a tune-up longer. I know, I did it.

[Rodsrsr]

Originally Posted by rgdalacrity

Yes, you would experience a difference in performance if you couple it with an updated exhaust system, throttle adjustment, performance chip and no smog equipment all well worth the time, money, and effort. Another benefit is your engine will run cooler and adhere to a tune-up longer. I know, I did it.

Thats true, but if you made all of those mods at the same time, how will you really know what the throttle body contributed. Its kind of like the old "chip" ads that bragged about adding 25 h.p (with SSI's) when in reality the majority of the increase was from the SSI's (before S Wongs chips of course)

[JG911]

So what would be the best mod for best money spent ?

[David]

This would be my list in order:

Chip
Exhaust
Air filter
Flywheel (if you don't mind a light flywheel)
Cams
Big-bore, porting, and top end rebuild
Twin plug
Bigger TB and Extrudehone

[RWebb]

re : in order

it all has to be done together and tuned as a unit - the motor is like an air pump; whatever is the most restrictive thing is what controls how much air is pumped.

[ChrisBennet]

Originally Posted by JG911

So what would be the best mod for best money spent ?

A Steve Wong chip or the same combined with a less restrictive exhaust is the biggest bang for the buck. After that, HP gains become very expensive.

The "problem" if you will, is that Porsche didn't leave a lot of horsepower on the table except where they made compromises for emissions.

For example, the heads on your 3.2 aready flow enough for over 300 horsepower and even completely removing you air filter won't get you any more power (so and aftermarket air filter isn't going to do squat).

If you want to be faster there is really no substitute for track time. Besides, it's sooo much fun.

-Chris

[Rodsrsr]

agreed.

[JG911]

Yes iv got a K&N panel filter on there now and all the gain was a nose of it sucking the the air in more,i did think about a exhaust but i was told the standard exhaust is good for 250bhp anyway.

How much is a S/W chip what kind of gains will i get ?

[pete917]

I know you can 'hone' the the intake manifold that will balance the airflow and make a small improvement. Or, you could replace the whole lot with throttle bodies, which will make a whole lot of improvement

[kepperly]

Has anyone come up with the ultimate cam for the 3.2? Just read from one poster that the ge 20 was a mistake, any feedback out there.

Keith Epperly
87 slant nose turbo look carrera cabriolet Wong chip (right chip). Bursch cat bypass and Bursch muffler. Put the Stock air cleaner back on because its a better filter.

[JG911]

If i put a after market exhaust would that help any ?

What would be the best way to do a system cross over pipe,pre silencer and rear box or cross over pipe,pre silence bypass pipe,rear box ?

[Mr.Puff]

If you want to be faster start reducing weight in the car . Free speed.

[JG911]

Originally Posted by Mr.Puff

If you want to be faster start reducing weight in the car . Free speed.

Yeh a good idea and i know some of my friends have done it in the passed but i don't really want to start doing that to be honest

The exhaust i might do tho

[JeremyD]

I went with a little bigger TB with my rebuild. From a few years ago - not too much bigger - if I remember correctly - 2-3mm was all - That coupled with Extrude Honed Intake AND a better exhaust ... You Extrude Hone mostly to even up the flow - the 3.2 intake is know to flow unevenly - don't want a cylinder going lean on you...

As chris said the 3.2 heads will flow 300 hp in a NA engine pretty easily -

I have 993 SS cams - which are pretty on the edge for motronic - not sure I could pass emissions at idle - but they come "on cam" pretty well above 5000 rpms...

That said - on the 3.2 carreras - the biggest bang for the buck for me was a Steve Wong chip = coupled with a euro premuffler and a sport exhaust.

Once you get into headers and such - the incremental gains are dwarfed by the money outflow...

[JG911]

Ok so would a cross over pipe pre silencer bypass and a sports rear box help any ?

[JeremyD]

Should help - if you have a chip to tie it all together - although the advice I got was the 3.2 does like to have a little back pressure which is why the euro premuffler works better than the straight pipe.

Forget who said this - but it's a good analogy - Building an engine is like baking a cake - all the ingedients have to work together. If you have too much of one thing it will taste and run like crap.

[JG911]

Oh rite so cross over pipe - pre silencer & a rear box should be better than crossover - bypass & rear silencer.

What do you think of this system ?

http://cgi.ebay.co.uk/PORSCHE-911-SPORTS-EXHAUST-STAINLESS-STEEL-BRAND-NEW_W0QQitemZ320205465040QQihZ011QQcategoryZ38786Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.co.uk/PORSCHE-EXHAUST-911-SPORTS-PRE-SILENCER-S-STEEL-1975-89_W0QQitemZ220190276945QQihZ012QQcategoryZ10408QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.co.uk/PORSCHE-EXHAUST-911-CROSSOVER-PIPE-S-STEEL-1975-89_W0QQitemZ320206200709QQihZ011QQcategoryZ10408QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem