Ace 4-2-1 Header

[sw20kosh]

From yesterday at Buttonwillow Raceway Park following a 370z Nismo down the straight.

As far as sound, this is ACE type A + ACE FP + stock catback with an exhaust valve installed right before the muffler (valve open in video).

[ame="https://www.youtube.com/watch?v=GpyVx4Wu9L0"]BW13CW 10152015 - YouTube[/ame]



Here is a hot lap if you want to listen to more of it:

[swarb]

Watch to the end.

[CSG David]

Originally Posted by Tekno Virus

In this thread: http://www.ft86club.com/forums/showthread.php?t=96255

The poster states the type B 350 rubs against the sub frame. Am I missing something?

ACE suggested stiffer engine mounts, but it isn't necessary. The 350 overpipe is definitely fat so the clearances are tight. As for 150 and 250, the suggestion remains for stiffer mounts but it is not necessary. As noted, all the fast people don't actually have stiffer engine mounts...it would be nice to have, but it's one of the items that's further down the list for us.

[NotSoJDM]

Originally Posted by CSG David

ACE suggested stiffer engine mounts, but it isn't necessary. The 350 overpipe is definitely fat so the clearances are tight. As for 150 and 250, the suggestion remains for stiffer mounts but it is not necessary. As noted, all the fast people don't actually have stiffer engine mounts...it would be nice to have, but it's one of the items that's further down the list for us.

Couple questions:

1) What is your criteria for whether or not the stiffer mounts are necessary? By my standards, they are definitely necessary for a daily driven car running a 350 overpipe. Under hard acceleration and left turns at speed, there is considerable vibration/rubbing from the overpipe on the subframe.

2) Can you elaborate on your correlation between 'fast people' and having stiffer engine mounts? Are you saying that those who exclusively track their car aren't running stiffer mounts as there are other mods that take priority?

[CSG David]

Originally Posted by NotSoJDM

Couple questions:

1) What is your criteria for whether or not the stiffer mounts are necessary? By my standards, they are definitely necessary for a daily driven car running a 350 overpipe. Under hard acceleration and left turns at speed, there is considerable vibration/rubbing from the overpipe on the subframe.

2) Can you elaborate on your correlation between 'fast people' and having stiffer engine mounts? Are you saying that those who exclusively track their car aren't running stiffer mounts as there are other mods that take priority?

1. We haven't noticed that vibration despite putting significant amount of heat into the engine bay, however, if the mounts are worn, it's possible the mounts are not controlling the engine movement as well. Worn mounts can be a result of the rubber just drying out and cracking. If you notice additional play in your bushings, then definitely look into the mounts.

2. Other modifications take priority for us and our clients (their choice). The rubbing or tapping noise is not even present (even when we check for these issues post track day). The amount of lateral loading (transitions and such) and length of time we are on the throttle is significantly longer than one would expect. We aren't going to say that the rubbing doesn't absolutely happen, but the suggestion remains. It's not an absolute necessity, however, if an engine mount solution is required for your application, we do sell engine mounts.

[NotSoJDM]

Originally Posted by CSG David

1. We haven't noticed that vibration despite putting significant amount of heat into the engine bay, however, if the mounts are worn, it's possible the mounts are not controlling the engine movement as well. Worn mounts can be a result of the rubber just drying out and cracking. If you notice additional play in your bushings, then definitely look into the mounts.



2. Other modifications take priority for us and our clients (their choice). The rubbing or tapping noise is not even present (even when we check for these issues post track day). The amount of lateral loading (transitions and such) and length of time we are on the throttle is significantly longer than one would expect. We aren't going to say that the rubbing doesn't absolutely happen, but the suggestion remains. It's not an absolute necessity, however, if an engine mount solution is required for your application, we do sell engine mounts.

Thanks for your feedback.

For what it's worth, I have a Type B/350 with 67k on my car, and it rubs as I've described above.

Another local has a Type A/350 with 24k on his car, and it rubs in a similar fashion to mine.

To provide feedback to those who are reading this thread, this has been my personal experience with them in daily driven cars, not those dedicated to track use.

I'm not refuting your findings, just adding to the sample size, and providing feedback for another sector of the market.


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[DarkSunrise]

Originally Posted by sw20kosh

From yesterday at Buttonwillow Raceway Park following a 370z Nismo down the straight.

Nice reference video. I usually get walked much harder on the straights by a friend with a Nismo 370Z (although he's got an aftermarket OSG LSD and seems to put power down better). Every time I read your posts, I'm tempted to buy this header lol.

[sw20kosh]

Originally Posted by NotSoJDM

Couple questions:

1) What is your criteria for whether or not the stiffer mounts are necessary? By my standards, they are definitely necessary for a daily driven car running a 350 overpipe. Under hard acceleration and left turns at speed, there is considerable vibration/rubbing from the overpipe on the subframe.

2) Can you elaborate on your correlation between 'fast people' and having stiffer engine mounts? Are you saying that those who exclusively track their car aren't running stiffer mounts as there are other mods that take priority?

I am one of those that tracks the car hard. No vibration or rattling so far. Hope it stays that way.

Type A 350.

[NotSoJDM]

Originally Posted by sw20kosh

I am one of those that tracks the car hard. No vibration or rattling so far. Hope it stays that way.



Type A 350.

Can you share mileage and the rest of your exhaust setup?


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[Brzzee]

Originally Posted by CSG David

ACE suggested stiffer engine mounts, but it isn't necessary. The 350 overpipe is definitely fat so the clearances are tight. As for 150 and 250, the suggestion remains for stiffer mounts but it is not necessary. As noted, all the fast people don't actually have stiffer engine mounts...it would be nice to have, but it's one of the items that's further down the list for us.

So ok, I'm a slow guy with a Type A 350 coming early next year. Will the STI engine mounts combined with a Whiteline transmission insert prevent contact?

I'm considering Swains White Lightning exhaust coating which adds 0.015" a side or 0.030" total to the diameter of the collector. Damn that job with GE small engine business group back in the day with coatings on blades and combustor cans.

Can u speculate on the combination of the engine mounts and coating keeping parts out of contact? Daily driver with several go fast track days a year planned.



Thanks

[Tekno Virus]

Originally Posted by NotSoJDM

Thanks for your feedback.

For what it's worth, I have a Type B/350 with 67k on my car, and it rubs as I've described above.

Another local has a Type A/350 with 24k on his car, and it rubs in a similar fashion to mine.

To provide feedback to those who are reading this thread, this has been my personal experience with them in daily driven cars, not those dedicated to track use.

I'm not refuting your findings, just adding to the sample size, and providing feedback for another sector of the market.


Sent from my iPhone using Tapatalk

Do you hear the subframe vibrate against the header? Or is this something you've noticed overtime by being under the car? What sort of damage do you see on the header? Is it false brinelling?

False brinelling means a vibrating piece causes damage to another by the small impacts caused the vibrations overtime digging into the other part.

[NotSoJDM]

Originally Posted by Tekno Virus

Do you hear the subframe vibrate against the header? Or is this something you've noticed overtime by being under the car? What sort of damage do you see on the header? Is it false brinelling?



False brinelling means a vibrating piece causes damage to another by the small impacts caused the vibrations overtime digging into the other part.

I can hear and feel it vibrate against the subframe. Ive only seen false brinelling from header to undertray contact in two spots. But I massaged the under tray with a hammer for more clearance =].

The area that I suspect is contacting the subframe is out of sight and will require me to remove the header to access it. I don't plan to do that anytime soon honestly unless I wrap the overpipe.




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[ohmai18]

Can the vibration from the Type A 350 be caused by installation? It needs to be spot on? Does Type B 350 suffer from the same issue?

[sw20kosh]

Originally Posted by NotSoJDM

Can you share mileage and the rest of your exhaust setup?


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10k miles

Ace FP, Stock cat back. Stock engine mounts.