Dynoed GS400......WOW!
Moderator - Electronics Forum
Joined: Feb 2001
Posts: 3,985
Likes: 12
From: Illinois
I usually replace mine out every 60 to 80k miles. They do last for quite a while. With a semi heavy foot I'm still getting 20mpg, mostly around town. And beating STi and M3 (E46) to boot. The M3 driver is a buddy of mine...I KNOW he won't cut me any slack at the light! 
Look at the graph... the run with the TM's starts at an earlier RPM, giving it more torque.. The second run was started at a later RPM, giving it less torque. These numbers cant be compared correctly...
It does make a difference when you motor is cooled down. We have an 88 10 sec mustang which cannot hot lap because of heat issues. We hot lapped her once it ran 10.1 @ 1/4 the first run the second run it only ran a 10.9. When the motor is cool the ecu tends to run it a little bit richer and more aggressive timing.
There isn't anything wrong with these runs starting at different RPMs. The engine doesn't somehow gain more torque just becaue the operator pushed the dyno's 'Record' button sooner.
It doesnt "gain" torque. But you cant see that peak torque is down low in the RPM band? And if at, lets say, 3k rpm you get peak torque.. if you started the dyno at 3500rpm on one run, you would get a lower peak torque. Whereas if you started the dyno run at 3000 rpm, you would then show the higher peak torque at a lower rpm. Therefore, you can see that if you start the dyno at a different rpm, you will show a different peak torque number. Ive dynoed hundreds of cars.. ive seen it all.
I got my headers installed yesterday! It took almost all day with two people working on it!
Here is some of my observations.......The flanges on the top of the converters need to be sanded down a small bit so they will fit better to the end of the headers. This will create an exhaust leak if you don't. You also need to replace the donut gaskets on the bottom end of the converters. I used the stock manifold gaskets. They looked like they were made better than the aftermarket ones. None of my o2 sensors had to be re-wired like I was told from another member. Order and take a new driver's side motor mount with you. They have to take it out anyway and if it looks pretty worn just go ahead and replace it! Mine just happen to break the day before....perfect timing!
Here's really what everyone wants to see......Performance: I can really feel the difference in the seat of my pants! It's pulls harder all the way across the board!
This mod gets a big 
in my book! We ran out of time to get the car on the dyno......but I will talk with Lexism and see if we can meet next friday and I will post picks of the latest dyno! 
I'm hoping for the same gains that he saw.......17rwhp and 17rwtq! Maybe I'll get lucky and see more 
Here is some of my observations.......The flanges on the top of the converters need to be sanded down a small bit so they will fit better to the end of the headers. This will create an exhaust leak if you don't. You also need to replace the donut gaskets on the bottom end of the converters. I used the stock manifold gaskets. They looked like they were made better than the aftermarket ones. None of my o2 sensors had to be re-wired like I was told from another member. Order and take a new driver's side motor mount with you. They have to take it out anyway and if it looks pretty worn just go ahead and replace it! Mine just happen to break the day before....perfect timing!
Here's really what everyone wants to see......Performance: I can really feel the difference in the seat of my pants! It's pulls harder all the way across the board!
This mod gets a big in my book! We ran out of time to get the car on the dyno......but I will talk with Lexism and see if we can meet next friday and I will post picks of the latest dyno! I'm hoping for the same gains that he saw.......17rwhp and 17rwtq! Maybe I'll get lucky and see more
I got my headers installed yesterday! It took almost all day with two people working on it!
Here is some of my observations.......The flanges on the top of the converters need to be sanded down a small bit so they will fit better to the end of the headers. This will create an exhaust leak if you don't. You also need to replace the donut gaskets on the bottom end of the converters. I used the stock manifold gaskets. They looked like they were made better than the aftermarket ones. None of my o2 sensors had to be re-wired like I was told from another member. Order and take a new driver's side motor mount with you. They have to take it out anyway and if it looks pretty worn just go ahead and replace it! Mine just happen to break the day before....perfect timing!
Here's really what everyone wants to see......Performance: I can really feel the difference in the seat of my pants! It's pulls harder all the way across the board! This mod gets a big in my book! We ran out of time to get the car on the dyno......but I will talk with Lexism and see if we can meet next friday and I will post picks of the latest dyno! I'm hoping for the same gains that he saw.......17rwhp and 17rwtq! Maybe I'll get lucky and see more
Here is some of my observations.......The flanges on the top of the converters need to be sanded down a small bit so they will fit better to the end of the headers. This will create an exhaust leak if you don't. You also need to replace the donut gaskets on the bottom end of the converters. I used the stock manifold gaskets. They looked like they were made better than the aftermarket ones. None of my o2 sensors had to be re-wired like I was told from another member. Order and take a new driver's side motor mount with you. They have to take it out anyway and if it looks pretty worn just go ahead and replace it! Mine just happen to break the day before....perfect timing!
Here's really what everyone wants to see......Performance: I can really feel the difference in the seat of my pants! It's pulls harder all the way across the board!
This mod gets a big in my book! We ran out of time to get the car on the dyno......but I will talk with Lexism and see if we can meet next friday and I will post picks of the latest dyno! I'm hoping for the same gains that he saw.......17rwhp and 17rwtq! Maybe I'll get lucky and see more reat Kevin! Keep us updated with those dyno results! BTW how much did you have to pay for the new engine mount (one side)?
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nope......my 98 blew a crank bearing and I installed everything on my '99 and haven't done a dyno. I will do a base and then after tuning with the neo sometime soon!
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scdroptop
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