so if somebody added a larger TB to a 3.4 that has the IPD Plenum, 100 cell cats, exhaust and K&N air flow filter with an ECU flash how much extra hp would you gain? ballpark...?

 

25-30hp at the wheels would be my guess....I think i've done everything NA without opening up the motor and I'd be happy with a 30hp gain at the wheels with all the below.
intake/TB/IPD/pulley/headers/200cell/straight through cans/GIAC tune
The only thing I'm going to do at this point is switch headers. I have a 44.5mm piping "equal length" headers but I'm going to switch to x51 style log headers just due to the fact that they are 48mm piping.
Sure, I would have gained 100hp+ with a supercharger with the same amount I put in but I'm still happy...for now

 

Sorry I misread what you wrote. I thought you were asking if all of those mods were done.
I don't think anyone has dynoed just adding a TB to your mod list...

 

Never noted anything like that from an induction change here on my dynojet chassis dyno. Making that much real power is quite a chore, its not like its made out to be in those shiny magazine ads, here in the real world.

 

Sorry I meant with all the mods I listed above...

 

I tend to agree for the most part and I am not really expecting much. If the engine design is maximized for performance from the factory with little room left on the table for improvements, short of making the engine pump more air through high lift cams and doing headwork, the rest of the intake tract will generally yield minimal improvements.

With that said, I haven't seen too many actual dynos with these mods other than from the manufacturers or resellers. Lots of talk but nothing to back them up. I consider this somewhat of a costly excercise but something I want to do to satisfy my own curiosity. I would love to dyno after every mod but not too practical due to cost. I do plan on getting it on the dyno at the end of my journey to see if it was worth it for me.

 

Jake,

what kind of -ves do you see with a bigger TP here...? I heard it's only good for 10 hp and 7 lb/ft of torque... probably not even worth it on a 3.4

 

Porsche X51 = lots of mods and lots of money for a modest 25hp so I always have a tough time buying into the numbers I see advertised for go fast add-ons :/

 

All I've seen is the power band move and not enough of a change to warrant the time or effort. Its pretty easy to end up with big intake syndrome on OEM engines that are smaller displacement.

BTW_ I have a total of three dynos, two of which are engine dynos and one of those is the only M96 engine dyno in North America, but none of them are smarter than we are. The dyno is just a tool, but it doesn't trump old fashioned evaluation and here I use both and let the engine tell me what it likes. This mindset isn't found with today's "Tuners".

Hell, my Wife set 4 Land Speed records after I made a change that LOST 6HP at the rear wheels but made for a much faster engine. Prior to that the engine was impressive on the dyno, but was .5MPH away from several records, after the change I went with my gut and those records still stand today.

When we start "racing dynos" things will change. Where the engine makes its power is the key.

 

I've put a few hundred miles after TB as of today.
Throttle response definitely improved. This is lower and upper rpms. Revs easier.
I'm not sure how to interpret this data but all pulls from 2nd gear full throttle to letting off middle of 4th gear
before max timing advance 49 after max timing advance 49(as expected)
before max MAF 258g/s after max MAF 238g/s.

 

I agree. I care more about the area under the curve for a street driven vehicle more so than peak hp. People always talk about peak hp but seem to rarely concentrate in the areas that count.

Your $&@& might be longer but I have more girth. LOL

 

agreed.... lol

cams is probably your only way to get some good torque under the curve and FVD makes some good ones... but don't know if it's worth the time or $$ to install them for what you get... pretty pricey but will work well with all the other mods....

 

x51 actually produces 40hp... 25 hp is just porsche's conservative rating

 

Can you site source for the 40hp boost on x51?
My 2004 40th AE w/x51 = 345hp as per Porsche. You claim 40hp which would make it 365hp yet a GT3 of same year 360hp. I have been in a 2004 and a 2005 GT3 and they are bothe heck of a lot faster than my 40th AE. So....

 

Ask around. That is the whisper number at Porsche. X51 is around 363 hp. 2004-2005 gt3 is 380 hp but most that have been tested produce 390 min hp and some at 400! (Bhp)

Gt3 feels (is) faster because the torque curve is flatter and much higher to redline and higher than x51 motor by about 30 lb/ft for a longer duration

Like Jake says its all about torque and ability to maintain this torque to redline. Gt3 does an amazing job of keeping good torque to redline.

If you look at some torque curves for bothy cars side by side you will understand why gt3 is much faster. Especially on a long track where it can stretch its legs.