Big dissapointment. I dont know if it was the weather, or the cat that caused my times to go down. What do you guys think? The weather this time was 75degrees, and very humid, as opposed to 50, and very cold. Do you guys thing these times are because of the cat, or the weather? Here are my results.

R/T ... .405
60' ... 2.302
330 ... 6.440
1/8 ... 9.776
MPH ... 73.81
1000 ... 12.661
1/4 ... 15.096
MPH ... 92.42


R/T ... .669
60' ... 2.341
330 ... 6.496
1/8 ... 9.841
MPH ... 73.80
1000 ... 12.727
1/4 ... 15.163
MPH ... 92.47


R/T ... .615
60' ... 2.425
330 ... 6.567
1/8 ... 9.899
MPH ... 74.05
1000 ... 12.789
1/4 ... 15.222
MPH ... 92.34


R/T ....479
60' ... 2.407
330 ... 6.569
1/8 ... 9.914
MPH ... 73.56
1000 ... 12.809
1/4 ... 15.251
MPH ... 92.19


And here are my results from before w/ 50 degree weather.

R/T ... .693
60' ... 2.323
330 ... 6.358
1/8 ... 9.632
MPH ... 75.02
1000 ... 12.476
1.4 ... 14.880
MPH ... 93.61

R/T ... .587
60' ... 2.310
330 ... 6.372
1/8 ... 9.657
MPH ... 74.77
1000 ... 12.506
1.4 ... 14.912
MPH ... 93.53


R/T ... .958
60' ... 2.319
330 ... 6.371
1/8 ... 9.655
MPH ... 74.76
1000 ... 12.517
1/4 ... 14.941
MPH ... 92.84

Spiro

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Black/Black 2001 CL-S
Random Technology Cat
RED AEM CAI
Polarg M6 Roadlamps

 

I think I said it before. RT cat really doesn't do much. Maybe 5hp tops, atleast on my maxima.

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1999 Nissan Maxima

[This message has been edited by 1max2nv (edited 05-17-2001).]

 

Spiroh,

I think your time reflects the weather condition. I don't think the RT Cat would decrease your time as .1-.2 sec is still within the range of humidity/temp condition. If anything, I think the RT cat neither add nor take away the performance of your car.

------------------
Frank
01-S White/Parchment
Comptech Sways & Springs

 

FDao,

The Cat did add horsepower to my car. The dyno proved it. What I am scared about, is I lost from the low-mid range, and gained up top.

Spiro

------------------
Black/Black 2001 CL-S
Random Technology Cat
RED AEM CAI
Polarg M6 Roadlamps

 

Well, if you dyoned it before and after. You would know for sure if you traded low-mid range for top end. Compare the two graphs and study the shape of the curve. Unless you going by someone else's word/dyno. RT cat is easy and cheap mod. Just don't expect to drop more than .1.

------------------
1999 Nissan Maxima with bolt ons.

[This message has been edited by 1max2nv (edited 05-17-2001).]

 

I dynoed the graphs, but they dont make sense to me. go to photos.yahoo.com/spiro_h and check them out. Maybe you can make more sense out of them.

Spiro

------------------
Black/Black 2001 CL-S
Random Technology Cat
RED AEM CAI
Polarg M6 Roadlamps

 

Spiro,

You hit the nail right on the head ! This car needs to boost torque down low and not worry too much about HP up high for every day driving and 1/4 mile runs. My headers have been tuned and retuned, and are now in their final stages pre-production to maximize low-end torque and forgo high end horsepower. To trim .2 off of the 60' and bring it to 1.9's 2.0's will result in a far better run. The car in stock forms pull fine up to 110MPH, a speed that you will not see in a 1/4 or in most street races. Similarly, the comptech headers yield greates gains at 5500-6500 RPM, when dyno'd that is in SS 3 which would put you in the 90MP++ zone. Again they really dont push the pwer to the low or mid-range where we really need it. Part of the problem is that when you open up the exhaust and remove too much restriction from it you will lose the backpressure you need for low-end torque. The benefit is that once the bigger VTEC cams roll in, is when youll see the dramatic change. The products we should be looking to are those that will shift our dyno and our peak HP/RPM to the center & peak Torque/RPM as low as possible. Easier said then done... but I'm working on it


Chris


------------------
2001 Nighthawk Black CLS Type S - Xephyr Performance CAI, PIAA 19173(Yellow) Road Lamp Upgrades, Full Wood Trim, Spoiler, 1/4 Mile in 14.424@97.23 MPH Atco Raceway 3/10/01 Best GTECH Sprint 5.554/28/01 with Poobah watching Xephyr Performance Intakes

 

Xephyr,

So it's the headers that is your project? If so..will you have reasonable prices?

Spiro

------------------
Black/Black 2001 CL-S
Random Technology Cat
RED AEM CAI
Polarg M6 Roadlamps

 

Prices will be VERY agressively prisced as always and Thats project #2 in the works.... the other is a tough nut to crack...may take until fall

Chris



------------------
2001 Nighthawk Black CLS Type S - Xephyr Performance CAI, PIAA 19173(Yellow) Road Lamp Upgrades, Full Wood Trim, Spoiler, 1/4 Mile in 14.424@97.23 MPH Atco Raceway 3/10/01 Best GTECH Sprint 5.554/28/01 with Poobah watching Xephyr Performance Intakes

 

Xephyr,

Sounds very good. I'm very excited. This is what our car needs.

Spiro

------------------
Black/Black 2001 CL-S
Random Technology Cat
RED AEM CAI
Polarg M6 Roadlamps

 

Well when can we expect the headers? And what's the other project???? Why so secretive, letting us know about your plans may make us hold off on going with Comptech, as I'm sure some people will do now that you mention you'll have headers for our cars.

 

Well It's been long enough and I have made significant progree to be able to "leak" some of the information.

Xephyr Performance Pipes - True Long Header, utilizing a "new" design increasing low-end torque while still improving mid-range HP. There will be two design specs.

#2
A "shorty-header" similar to comptech in header length, however megaphone tapered to boost torque.
A "long-header" to maximize low-end and mid-range power, leveling the power band and increasing overall 1/4 mile acceleration.

Both are currently being flow tested to tweak the most power available. The difficulty lies in the VTEC and 4 valve/cylinder engine. More flow is not necessarily better unless proper backpressure is maintained on the low cams, while free-flowing exhaust is promoted on the high cams.

#1

Xephyr Performance ECU Upgrade - Removing the shift lock into 1st gear from 2nd. This upgrade will allow SS shifting back into 1st under 35MPH, yet retaining the auto upshift into 2nd to prevent over-revving and rev-limiter. Additionally, modified fuel trim tolerences and optimizations for intake/header combinations....


More to follow soon..............

Chris

------------------
2001 Nighthawk Black CLS Type S - Xephyr Performance CAI, PIAA 19173(Yellow) Road Lamp Upgrades, Full Wood Trim, Spoiler, 1/4 Mile in 14.424@97.23 MPH Atco Raceway 3/10/01 Best GTECH Sprint 5.554/28/01 with Poobah watching Xephyr Performance Intakes

 

Damn!! That's what I like to hear. Do you have any dates, as to when the headers will be ready for shipping?

Spiro

------------------
Black/Black 2001 CL-S
Random Technology Cat
RED AEM CAI
Polarg M6 Roadlamps

 

Chris, if you can give me some more low end grunt i'll sell my comptech headers and buy yours.
Keep up the R&D!! Did you want to start a new topic in your forum?

------------------
2001 Satin Silver Cl Type S.
Comptech:Headers, Springs & Sways
AEM CAI
Toyo T1S Proxys 235/45/17
SSR Competition wheels 17x8
35% Llumar metallic tint
My Car

 

It will take about 30 Days from the time the I am done with the proto's to manufacture a dozen sets. Initial costs estimates will place them in the 850 - 1000 dollar range for the shorty and full long setups with JetHot coating. I would like to have at least a post production demo ready for the Park Ave meet. But, it will be tight....




------------------
2001 Nighthawk Black CLS Type S - Xephyr Performance CAI, PIAA 19173(Yellow) Road Lamp Upgrades, Full Wood Trim, Spoiler, 1/4 Mile in 14.424@97.23 MPH Atco Raceway 3/10/01 Best GTECH Sprint 5.554/28/01 with Poobah watching Xephyr Performance Intakes

 

just give him his time to do R&D and don't rush him

 

chris, have you done testing on the jet hot coating? I've seen loses in power to comptech headers that had this done.

 

Sorry Spiro about getting off topic in your thread lol..... please reply to my posts here: http://www.acura-cl.com/ubb/Forum14/HTML/000029.html

and leave this thread as a discussion for the Random Cat Spiro originally posted


Thanks ,

Chris

------------------
2001 Nighthawk Black CLS Type S - Xephyr Performance CAI, PIAA 19173(Yellow) Road Lamp Upgrades, Full Wood Trim, Spoiler, 1/4 Mile in 14.424@97.23 MPH Atco Raceway 3/10/01 Best GTECH Sprint 5.554/28/01 with Poobah watching Xephyr Performance Intakes

 

Xephyr,

Not a problem.

Spiro

------------------
Black/Black 2001 CL-S
Random Technology Cat
RED AEM CAI
Polarg M6 Roadlamps

 

The first run's dyno graph is all messed up. I don't even think the peak TQ reading for the first run is even correct. You are right!!! You can't make any comparison from that graph.




------------------
1999 Nissan Maxima with bolt ons.

 

1max2nv,

I will never go to that shop again!! The only way to find out now..is by doing another dyno, and compare it to other peoples dyno runs.

Spiro

------------------
Black/Black 2001 CL-S
Random Technology Cat
RED AEM CAI
Polarg M6 Roadlamps

 

Interesting. Your CLS makes around 195 hp and 173 ft/tq with Intake and RT cat.

Wow, that's alot of drivetrain loss ~65HP. My auto 1999 lost about 35hp.

The 2000 maxima makes around 176hp and 189ft/tq with just an intake.

Here's a dyno graph of 2000 5speed Maxima SE with intake.


------------------
1999 Nissan Maxima with bolt ons.

[This message has been edited by 1max2nv (edited 05-17-2001).]

[This message has been edited by 1max2nv (edited 05-17-2001).]

[This message has been edited by 1max2nv (edited 05-17-2001).]

[This message has been edited by 1max2nv (edited 05-17-2001).]

 

Yeah but those are not normal times. Either something is wrong with their dyno..or my car is Fu!!ed.

Spiro

------------------
Black/Black 2001 CL-S
Random Technology Cat
RED AEM CAI
Polarg M6 Roadlamps

 

I highly recommend AGAINST Jet Hot coatings!!! Two people I know so far have had Jet Hot coatings, a friend of mine and myself. My friend had her car dyno'd before and after the headers, and she didn't see ANY increase in power until 5,500 rpms and her peak gain was 10hp at about 6,000+rpms.

My headers were coated TWICE because Jet Hot had some problems with the coating "bubbling" inside of the downpipe the first time they coated them. I had minimal gains from 4,000 - 5,500rpms (1-3hp max) with a peak increase of 6hp around 6,000rpms.

I can post the dyno sheet here if you would like to see it! I even had my care redyno'd a month later after running a fuel injector cleaner, an oil change, and cleaning the air filter just make sure it wasn't something else causing my dismal gains with the headers.


------------------
2000 Acccord LX V6 Sedan
- Eibach Pro-Kit Springs& Koni Yellow Shocks
- AEM Short Ram Intake
- AEM Tru-Power Pulleys
- Jet Hot Coated CompTech Headers
- Denso Iridium IK20 Plugs
- Forged Racing Hart 17x7.5" CP-035's with 225/45 RE730's
- 15.44 @ 87.87mph (Track)