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Love this conversation as it gives me something to think about. I'm personally only interested in making more noise, which aids in the enjoyment factor for me. I've already got a gundo hack...so I may be looking for headers and the 200 cell cats.
I know some will say this topic has been covered, but I like seeing new posts with this conversation. Technology and companies change over time...and I don't want to base buying decisions on 4 year old threads.
I've seen the high flow cats with larger (63mm) pipes. Does this help or hurt? It seems to me it would decrease back pressure and I've always thought that hurts low end torque.
Love this conversation as it gives me something to think about. I'm personally only interested in making more noise, which aids in the enjoyment factor for me. I've already got a gundo hack...so I may be looking for headers and the 200 cell cats.
I know some will say this topic has been covered, but I like seeing new posts with this conversation. Technology and companies change over time...and I don't want to base buying decisions on 4 year old threads.
Keep it up guys! Great insights here!
With cats and headers you will definitely get great sound. I had the gundo and added x51 headers and AWE cats. Love it
This topic has been covered and dont think anything has changed the technology for headers/cats/plenums/intakes in quite some time that would change anyones purchase decision.
But the same topics come up over and over again and people love to talk about their cars so there ya go (but honestly how many more spacer threads do we need )
I installed an IPD plenum yesterday in my 997.1 C2 3.6l car. I got the unit off a member here on the Rennlist classifieds. I did the 3.6l performance plenum only, factory TB is still there. IPD part #97174-3.6 advertised for 10 to 12 peak hp gain
I've abridged my original post and included only data points for posterity:
(3) stretches of road going flat out wide open throttle at 2,000 rpms
Equipment: Dual XGPS150 and OBDLink LX using Harry's LapTimer Grand Prix edition
Baseline numbers on 60,8xx miles in Solo driving
30 - 60 in 2.64 seconds*
25 - 60 in 3.89 seconds*
20 - 60 in 4.39 seconds*
2:00 pm, 68 degree weather with approximately 58% humidity and 1/2 tank of gas. Cold tire pressure 37/42.
Oil temp at 190 degrees, coolant temperature at 178-180 degrees, air intake charge temperature at 99 degrees.
IPD Plenum installed.
I thought the car felt a little torquier in 2nd gear, even with passenger.
IPD after 20 mile break in + 240 lbs passenger
30 - 60 in 3.20 seconds
25 - 60 in 4.60 seconds
20 - 60 in 4.82 seconds
3:15 pm after 20 mile break in on IPD. Temperature levels were not checked.
IPD after 30 mile break in Solo driving.
30 - 60 in 2.95 seconds
25 - 60 in 4.08 seconds
20 - 60 in 4.53 seconds
3:45 pm. 67 degree weather ~58% humidity, 30 miles break in on IPD.
Oil temperature at 200 degrees, coolant at 198 degrees and air intake charge temperature at 102 degrees.
IPD after 50+ mile break in Solo driving
30 - 60 in 3.01 seconds*
25 - 60 in 4.05 seconds
20 - 60 in 4.55 seconds*
11:30 am with 67 degree and 59% humidity with over 50 miles break in on IPD and 1/4-3/8 tank of gas.
Oil temperature at 190 degrees, coolant at 180 degrees and air intake charger temperature at 93 degrees.
*Multiple runs were performed, lowest time posted. Total deviation up to ~0.12s observed between runs.
My take from this; the last two sets of numbers are relatively consistent with the IPD installed. Even with the benefit of the doubt the car is getting close(r) to factory, certainly not faster. I'll do another run in a month. Likely be swapping back to stock after that and do another run then to test back-to-back plenums... unless I get a tune before then (the kool-aid is strong with me)
Best "performance" improvement is to spent $100 for a professional coach/driver for any 30 min DE session on the track. 20-30 hp makes zero difference there. Driver's inputs are priceless. You can "buy" time on the track but it is very expensive. Short tracks like Lime Rock GT4 runs about 2 sec faster then my C2S. That is about $25k/second
I'm interested to know what people think about the following 997.1 performance improvements and if they are worth it? IPD Plenum and 82mm throttle body, Headers and 200 cell cats. After, a possible ECM remap/flash/update. I've read about these components, but am curious to hear what people think as a package.
When you talk about larger intake TB and less restrictive exhaust systems you are talking about allowing for better flow which the forced induction crowd know well. The question is what size engine do you have (3.6 or 3.8) and is its current TB not allowing maximum flow? I'd be interested to know what the maximum flow rate that a 74mm TB will allow vs. the maximum flow that a 3.6 and a 3.8 motor can accept.
240 pounds is quite alot of weight added in. Do the same tests by yourself or the comparison is useless.
DC, I did - it was mentioned in the body of the post, the last of numbers is solo driven after 30 miles of break-in. I took pops with during the initial break-in period, those numbers were recorded to show him the app the setup, simply posted because why not.
I've modified my original post and included another run-set from this morning. Similar temps and humidity, lowest air intake temp. I'm still slower than I was with factory piece. This is now after 50+ miles of break-in miles. The 30 mile and 50 mile numbers are pretty consistent. I'll do another run in a month, then swap back to factory that same day and do a back to back.
For whatever it's worth the IPD plenum feels and looks nice although I did have to dremel off a few burrs on the port that takes the AOS vent line (I think that's what that hose is?). At the very least it's nice to give Her some jewelry
Here ya go
2005 997.1S
Cargraphic exhaust
Cargraphic 200 cell X-pipe cats
Cargraphic Headers
Fabspeed Competition duel carbon intake
APR SOFTWARE
IPD PLENIUM & GT3 throttle body
Thanks for posting
May just be me but I see a big black image, a dyno chart that doesn't render right (can't follow the lines), and another big black box. Is that what you are seeing?
I'm fairly new to the forum, and so don't want to step on anyone's opinion. I previously tuned a few other 'sports' cars (a '94 SVT Mustang Cobra, '06 Infinity G35 Coupe) with performance related engine mods and enjoyed wonderful improvements to those vehicles. I have personally, never dyno'd but recognize the empirical, cold valuation that numbers and charts offer to many drivers.
In my 997.1S for about 7 months and because I live 15 minutes from their facility, I went with Fabspeed. I started with their dual air intake, then the 200 cel catback pipes and finally an ECM tune for now. The improvements in the torque band, throttle response and overall acceleration are very noticeable and IMHO worth every penny. I am considering the GT3 throttle body/ plenum and then a retune. but for now I couldn't be happier. If you pay attention to all of the people on the forums who have done these mods, my take is, the vast majority are quite pleased.
11-06-2017, 03:55 PM
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