Forged Performance: Cosworth Plenum test on Philthy's Car

Sharif@Forged · 01-23-2008, 04:58 PM

As many of you saw on the main Cosworth thread, we did some testing with the plenum on Eagletangreen's 350Z, but had an issue with the plenum, and no good testing data came from that day.

So the next contestant up for Cosworth plenum testing, happened to be the infamous Philthy's G35. The car has been at our shop for a short list of minor to medium modifications that needed to be performed. All the big stuff, like engine, fuel, and EMS, was handled prior to the car's arrival.

Now lets get to the good stuff.

1) If you have upgraded fuel rails, and longer (non OEM) injectors, you will need one of these: Cosworth Plenum Spacer Kit This gives you the clearance needed to run upgraded fuel rails and larger/longer injectors.

2) A fair amount of assembly is required when you recieve the plenum. It is very easy work and requires basic tools, but is somewhat time consuming, and everything needs to be carefully trqed to spec. All fittings need to be installed, new hoses run, and in the case of the FI cars we do here, we tap for additional vaccum sources, as to avoid the use of vaccum T's.

3) Before the plenum is installed, and then after:

4) Here are a few more glamour shots:

Now for the results, with testing performed at low boost.
The overall peak power increase was a modest 13whp, but the change in power at 6600rpm is a huge 30whp. The Cosworth plenum definately flattens out the power curve towards redline, and results in a larger power gain as redline approaches.

We're working on a few other pieces, before shooting for more power, but just wanted to share the latest results.

Here are some more shots of Phil's car:

monokuroboo · 01-23-2008, 05:03 PM

nice! :P
you're doing well with the D300 haha.... (the angled shot on the dyno is the best<3)

RudeG_v2.0 · 01-23-2008, 05:04 PM

Interesting. Thanks for posting the reults.

Sharif@Forged · 01-23-2008, 05:04 PM

Quote:

Originally Posted by monokuroboo

nice! :P
you're doing well with the D300 haha.... (the angled shot on the dyno is the best<3)

Haha...arent you going to ask what the "red" button does?

JAMEZ@CiNcity · 01-23-2008, 05:05 PM

I love the dual knock amp setup. Very nice car, and it's good to see some more quantifiable power gains from the Cosworth.

Crom · 01-23-2008, 05:05 PM

Nice tests...thanks for the comparo.

thawk408 · 01-23-2008, 05:05 PM

Very nice! Now for 20psi test!!!

JAMEZ@CiNcity · 01-23-2008, 05:06 PM

Quote:

Originally Posted by Sharif@Forged

Haha...arent you going to ask what the "red" button does?

I was wondering about that myself, what does it do?

monokuroboo · 01-23-2008, 05:08 PM

Quote:

Originally Posted by Sharif@Forged

Haha...arent you going to ask what the "red" button does?

hahaha.....what does it do? (now I'm scared......wtf does it do

)

RudeG_v2.0 · 01-23-2008, 05:09 PM

Quote:

Originally Posted by Sharif@Forged

Haha...arent you going to ask what the "red" button does?

NO2???

thawk408 · 01-23-2008, 05:09 PM

Quote:

Originally Posted by RudeG_v2.0

NO2???

neons

Sharif@Forged · 01-23-2008, 05:11 PM

Quote:

Originally Posted by thawk408

Very nice! Now for 20psi test!!!

That test is ALL YOU man!

Ready when you are!!

theking · 01-23-2008, 05:12 PM

The hazards because of the panel for the knock amps. That's my guess.

Quote:

Originally Posted by monokuroboo

hahaha.....what does it do? (now I'm scared......wtf does it do

)

Sharif@Forged · 01-23-2008, 05:13 PM

Quote:

Originally Posted by theking

The hazards because of the placement of the knock amps. That's my guess.

Hazards??? It's a track car....doesnt need hazards...LOL.

monokuroboo · 01-23-2008, 05:13 PM

stop being such a tease!!

failsafe306 · 01-23-2008, 05:14 PM

Gorgeous car...

rrmedicx · 01-23-2008, 05:19 PM

The gains noted are above the crawford set-up correct, or versus a stock plenum. I ask because I see the Crawford in the before photo, but I'm not sure when the baseline dyno was conducted, before or after the addition of the crawford.
I'd like to know as I am running the crawford now.
Thanks.

Sharif@Forged · 01-23-2008, 05:20 PM

Quote:

Originally Posted by rrmedicx

The gains noted are above the crawford set-up correct, or versus a stock plenum. I ask because I see the Crawford in the before photo, but I'm not sure when the baseline dyno was conducted, before or after the addition of the crawford.
I'd like to know as I am running the crawford now.
Thanks.

Sorry about that. Yes, the baseline was Crawford upper plenum. I am curious if the gains would have been even greater than a stock upper as the baseline.

The red button is for scramble boost.

monokuroboo · 01-23-2008, 05:22 PM

Quote:

Originally Posted by Sharif@Forged

The red button is for scramble boost.

haha nice... extra boost on demand is always good

Motormouth · 01-23-2008, 05:23 PM

scramble boost on the passenger side center console? weird.

01-23-2008, 04:58 PM	#1
Sharif@Forged Sponsor Forged Performance Join Date: Dec 2003 Location: Marietta, GA Posts: 12,308 iTrader: (80)	Forged Performance: Cosworth Plenum test on Philthy's Car As many of you saw on the main Cosworth thread, we did some testing with the plenum on Eagletangreen's 350Z, but had an issue with the plenum, and no good testing data came from that day. So the next contestant up for Cosworth plenum testing, happened to be the infamous Philthy's G35. The car has been at our shop for a short list of minor to medium modifications that needed to be performed. All the big stuff, like engine, fuel, and EMS, was handled prior to the car's arrival. Now lets get to the good stuff. 1) If you have upgraded fuel rails, and longer (non OEM) injectors, you will need one of these: Cosworth Plenum Spacer Kit This gives you the clearance needed to run upgraded fuel rails and larger/longer injectors. 2) A fair amount of assembly is required when you recieve the plenum. It is very easy work and requires basic tools, but is somewhat time consuming, and everything needs to be carefully trqed to spec. All fittings need to be installed, new hoses run, and in the case of the FI cars we do here, we tap for additional vaccum sources, as to avoid the use of vaccum T's. 3) Before the plenum is installed, and then after: 4) Here are a few more glamour shots: Now for the results, with testing performed at low boost. The overall peak power increase was a modest 13whp, but the change in power at 6600rpm is a huge 30whp. The Cosworth plenum definately flattens out the power curve towards redline, and results in a larger power gain as redline approaches. We're working on a few other pieces, before shooting for more power, but just wanted to share the latest results. Here are some more shots of Phil's car: __________________ Redline Time Attack Class Winner!!! HKS Pro Dealer (FCON Vpro BASIC Install/Tuned $2990), Certified: Fcon, Haltech, MoTec, AEM\| www.forgedperformance.com \| Sharif@ForgedPerformance.com

01-23-2008, 05:03 PM	#2
monokuroboo :\ hihihi? Join Date: Oct 2006 Location: the gay area, ca (I miss LA) Posts: 4,334 iTrader: (2)	nice! :P you're doing well with the D300 haha.... (the angled shot on the dyno is the best<3) __________________ hillbilly chris (1:31:40 PM):i don't molest tampons hillbilly chris (1:31:52 PM):i collect hillbilly chris (10:01:38 PM): my tampon leaked ..................3hree5ive0ero and his tampon obsession FTL.

01-23-2008, 05:05 PM	#5
JAMEZ@CiNcity Sponsor CiNcity Designs Join Date: Aug 2005 Location: South Cackalack Posts: 5,386 iTrader: (10)	I love the dual knock amp setup. Very nice car, and it's good to see some more quantifiable power gains from the Cosworth. __________________ Forged Performance CiNcity Designs Impossible is Nothing Shift_Tasty

01-23-2008, 05:05 PM	#6
Crom Valhalla Join Date: Sep 2004 Location: Huntington Beach Posts: 2,496 iTrader: (25)	Nice tests...thanks for the comparo. __________________ 2003 SS APS TT, 5??RWH 535TRQ - DJ << TRACK HEADLIGHT COVERS >> http://www.my350z.com/forum/showthre...=350640&page=6

01-23-2008, 05:13 PM	#15
monokuroboo :\ hihihi? Join Date: Oct 2006 Location: the gay area, ca (I miss LA) Posts: 4,334 iTrader: (2)	stop being such a tease!! __________________ hillbilly chris (1:31:40 PM):i don't molest tampons hillbilly chris (1:31:52 PM):i collect hillbilly chris (10:01:38 PM): my tampon leaked ..................3hree5ive0ero and his tampon obsession FTL.

01-23-2008, 05:05 PM	#7
thawk408 Registered User Join Date: Mar 2004 Location: Nashville, TN Posts: 2,745 iTrader: (8)	Very nice! Now for 20psi test!!!

01-23-2008, 05:19 PM	#17
rrmedicx Registered User Join Date: May 2004 Location: NY Posts: 1,251 iTrader: (31)	The gains noted are above the crawford set-up correct, or versus a stock plenum. I ask because I see the Crawford in the before photo, but I'm not sure when the baseline dyno was conducted, before or after the addition of the crawford. I'd like to know as I am running the crawford now. Thanks. __________________ ZMEDIC 2003 LeMans Sunset.

01-23-2008, 05:23 PM	#20
Motormouth Registered User Join Date: Aug 2005 Location: Center City Philadelphia Posts: 12,457 iTrader: (38)	scramble boost on the passenger side center console? weird. __________________ It is my firm belief that it is a mistake to hold firm beliefs