I can't wait to start modding my 996TT, but I'm not familiar with this engine/electronics, ect. I hear the bottom end is strong enough for about 700HP, but what is the limit for the stock injectors and stock fuel rails? I'm also wondering why I have not heard about electronic boost controllers for the Porsche. An EBC would allow us to boost so much faster, and we could raise our boost pressure for like 500 bucks with a Blitz EBC, but I'm guessing the Porsche's electronics wont allow it?? Has anyone tried methanol injection? It seems the less expensive mods that make big power are not mentioned much, but I am new to the 996TT. Any input would be greatly appreciated, because I'm dying to put a boost controller on my car ASAP if it will work. How much boost can be added to a stock 996TT If I have race fuel, w/o going too far? Thanks in advance.

 

You know they are going to ask you to use the search located in between Quick Links and New Posts.

 

LOL Yeh, but I seem to have to read through sooooo much info to find what I'm looking for. Thought it would be an easy question for the guru's out there. Actually, I did find EBC's that are made for the Porsche, but need to know how far I can boost her until I'm on that raggety edge. What is the 1st weak link? Ok..I'll try to find the info the hard way. I guess. bummer.

 

Finding very little. I read a 3 page discussion that had no real answers, but it looks like the stock fuel pump is a very weak link and the stock injectors as well. FULL 100% injector and fuel pump output, which is not safe, is about 540HP. I'm really surprised Porsche did not allow much headroom here. Funny my 300ZXTT stock fuel pump is good to about 700HP, but only ran 300HP from the factory. Bummer the factory setup is so limited on the 996TT. Looks like I could only bump up the boost a tad w/o changing the fuel pump, injectors, and fuel rails. $$$$$$$$$$$$'S That sux!!

 

Just my obserations after lurking for quite some time now.

The Porsche has a relatively high 9.5:1 compression ratio (relative to Japanese turbo cars). Due to this, it is very important to have the car tuned (fuel and timing) before raising the boost. If you are going to have the ECU flashed (tuned), you might as well let them set the boost.

Another reason to not use an aftermarket boost controller is because you may lose the ECU's ability to reduce boost if it sees a problem (high intake temp, high coolant temps, detonation, ect.).

A lot of the increased spool of an aftermarket EBC is due to waitng later to start opening the wastegate. Unless your changing turbos (with a larger internal wastegate) or moving to an external wastegate, I doubt you will be able to wait significantly longer to start opening the wastegate.

I'm pretty sure I will add a water/methenal kit to my 996TTT (when I get one). It's a nice safety feature once you up the boost with a tune. It would also be nice if you upgrade the turbos/fuel system and decide to run higher boost on pump gas.

As far as the fuel system, it appears that most people either raise the fuel pressure with a new fuel pressure regulator or add injectors as they exceed the 500 crank hp level.

Later, Steve

 

Thanks Steve. Well. Looks like the Porsche will just have to be content with where she sits for awhile. I really do not want to fork out so much cash for so little gain. Sigh. She is really nice from the factory though. Just would have been nice if Porsche gave us a little more headroom.

 

Given a simple tune will give you approximately 70hp for around $1,000, I don't see that as a little gain.

I've always been told that anything that less than $100/hp is a performance bargain. At $14/hp, the tune is a steal.

Later, Steve

 

WOW! A 70HP gain with all else remaining the same is a good gain for the cost. Is that just an ECU flash that is needed? or what??? Excited! Is she still going to pass emissions? I'll jump all over that!

 

Hundreds of these cars use EBCs. Both of my cars used Greddy units.

 

+1

I'm running an ebc too. Mine is also a Greddy.

 

What are your boost settings? I expect 1.0 bar is not pushing it too much. I do understand what Steve is saying about the computer not being able to retard timing if needed, but I would never boost much w/o precautions...High octane gas, or methanol injection. What is you max on the gain setting? Do you have a tune with the EBC, or stock tune? Thanks for the input.

 

You will want a tune that is designed for an EBC. Low boost on pump and high boost on race gas. I wouldnt start with an EBC on the stock tune and turn up the boost, likely to throw boost CEL's or worse.

Start with a flash, get an exhaust, diverter valves and intake. Go from there, expect things to get expensive quick.

 

That is what I expected. I'm most surprised at the cost of the exhaust. The pipes are so short, and do not appear to be that complex. I know a fabricator that can Fab ANYTHING!!! He does the Z's intercooler piping that has tons of bends, and just millimeters of space to squeeze them in, for under $600 bucks. He is OCD about his work. I should get him in the Porsche game. He could make us all very happy. I'm gonna call him now.

 

That's not true. The knock sensors don't stop working due to the addition of an EBC. The ECU will still retard timing if it senses knock.

 

Just a basic K16 flash on these cars adds 75whp or so...adding Meth can get you another 40-70whp depending on injectors and tune. My car made almost 600whp with k24/18g's, 72lb injectors, 1 stock fuel pump and 100% meth, and this was with stock IC's, piping and airbox with stock paper filter...changing injectors is not a big deal and definitely worth the aggravation... If you install a EBC, your ECU will lose the ability to control boost...ie no safety, as you have to disconnect the N75 valve...If you run a boost controler in these cars, you HAVE to pay attention to your boost guage and continuously monitor outdoor temps and anything else that can change boost levels...