Hi Bros,

I just ordered a big Y-pipe.
I will go to the dyno, shoot a run, bolt the pipe on the dyno and re-shoot a run.
The lonely issue is the ECU won't have long time to adapt...
I hope for a gain!

(My actual set up: 997.1TT with upgraded VTGs, full exhaust, 997.2 Ics, Proto' tune; 660hp/900Nm)

P.

 

Which Y-pipe did you go for?

 

I went with Protomotive, far bigger than stock one.

I'm not absolutely sure of some gain, but I wanted to go ahead...
At least it will give a "racing touch" to my engine bay! (but I hope not only)

Other info:
Yesterday I ran a 100-200 and 300 by -2°C AT: 5.9' and 21.75", my best times were 5.64" and 21.16" by 03°C and 06°C AT, so my perfs do not improve when AT goes under 05°C.

P.

 

Have you upgraded the plenum and Throttle body as well? I've heard it can take up to a week of driving around for everything to adjust to the new air flow before you can feel/realize the gains, if any. Not sure what the dyno will tell you doing back to backs in this case.

Should be interesting.???..Please post your findings.

Thanks.

 

My plenum is stock, perhap's I will bolt the 82mm with GT3 Throttle body later, it takes time to test everything but how to know the truth?...

About the ECU adjustement, it is right the back to back dyno test will perhap's be obsolete, but I perfectly know my times (at several AT's) on the same road with the V-box (and files are archived), so I'm sure to notice anything if there is.

 

Yes but until the car adapts to the new mods you may not be any faster than you were before!

 

With the pipe the lonely mod will be a higher intake volume allowed across it, so I think the intake boosted air will "rush" a bit better to the cylinders.
I don't think the engine can loose power, at worse no gain...

The question is "is my stock pipe restrictive regarding my set up?"...

My turbos are 66mm/47.55mm exducer/inducer turbines, bigger than stock, my boost pressure is 1.45 Bar at 4500rpm and about 1.3 from 5000 to 7200rpm, so the intake airflow is far larger than the stock one, but enough larger to exceed the stock y-pipe airflow capacity?
I will know soon!

(Stock 997.1TT: 60/46.9mm exd/inducer with 1.2 Bar a short time and 1.0 Bar continuous with 6800rpm limiter)

Notice my need for now is a bit better top end, I think my 900Nm at 4500Nm are enough for my stock internals.
I can boost a bit more after 5000rpm, but it needs to lower a bit the timing and the engine "feeling" is not as good, and the top end curve slow down sooner, and I want a straight line to the rev limiter!

P.

 

Pascal your choke point on the intake side is going to be the throttle body and plenum. Go to the 83mm GT3 throttle body and you will notice a jump in performance. The only issue is you will absolutely need a re-tune because the larger TB will completely throw off the ECU and you will be out of range on the MAF sensors. You might be ok if you are only running speed density/MAP.

 

The thing is I am heading down a similar route to you with the mods I am putting on my car and was intending to put the IPD plenum, IPD y-pipe and GT3 TB.

From what I have been told I wouldn't say say you are restricted at all.

I was told that you will be putting all this extra air into your engine but what are you going to do with it? So the answer was you will need cams to help it out otherwise there is no real benefit.

Another thing is if you are worried about your turbos not being fed enough air in the higher rpm's then you might want to consider changing the turbo inlet pipes instead.

I personally think you have hit the limit for cost vs power until you rebuild! IMO but I could be wrong.

 

Who manufactures the speed density?

 

My maf sensor went bad recently, I asked my tech to go maf-less or any info on speed density and he never got back to me.. I ended up with 2 new maf sensors; can any one elaborate a speed density maf sensor? Im on 65mm vgts along with, 83mm tb/ ipd plenum, evoms inlet pipes, evo intercoolers, full exhaust, built motor, built trans.. p.s my y-pipe is stock.

 

Thxs for your interest my friends

To Gene:

82/3 plenum with GT3 T.body will perhap's be my next mod, about the retuning I work with Todd K. so I'm not afraid if needed.
I can ask him about running Mafless too?
Good idea but I don't know the + and - with this choice?


To Nick:

Yes your engine will be close to mine, I will consider the high cams if I re-build the engine with Carillos etc..., at this point I will run more boost too like Yorgos and Toby.
For now I work "around" the engine, I know the inlet turbo pipes need to be changed, but it needs to bolt off the engine, so I wait for a clutch or something like it... (I will probably go with Evoms for this parts, Sportec and other carbon parts are really too expensive )

I agree with you: I'm now very near the limit without rebuilding my engine...

To Salerno:

My bigger Y-pipe test will perhap's help you to know if you need one!
I couldn't know while reading several threads, so I decided to test myself;
if some of us did tests with 83 plenum, Mafless or other mods I'm very interested, it could help us to save money!

P.

PS: Todd told me about E85 advantages (natural cooling effect, high octane),
If it is possible to obtain a real "flexfuel" car it could interest me too.

 

I have already purchased the GT3 TB it is sitting here with me and I am awaiting the IPD plenum and new style Y-pipe which are currently being made as I am as bad as you


I am very interested in the Speed density and would like to know who produces/manufactures them?


I will too dyno my car before and after but will wait a week before I do both but his will not happen till after I have fitted my turbos and intercoolers.

I also have the evoms turbo inlet pipes sitting here too. They too are very expensive for 2 pieces of silicone and when I showed them to a company over here they told me they can produce a similar type of hoses for less.

 

Hmmm....So I literally received a Werks1 Plenum, 82mm GT3 TB, Werks1 Y-Pipe, and a BMC Filter, yesterday. Planning the install hopefully very soon. However, I will be getting a new ECU tune and a few other goodies installed at the same time, so I won't be able to make a clear-cut base to formulate performance gains from just adding IPD/TB/Y-PIPE/BMC.

All this confuses me......however I am very interested in what your findings will be.

 

Have you ever checked 100-200 or 60-130 times ? Your car should be a fast VTG based tt