ATS Pulse exhaust manifold qustions

[csnider]

Hi,

I still have the stock manifold with the ports matched up per the porting and polish thread guidlines... . My manifold has always "moved" around judging by the witness marks on the head/manifold gaskets and I rarely if at all see temps over 900-1000 (pre turbo). . So, I guess the next move is a ATS Right?... Are there any performance increases besides the better more constant fit?. . Does everthing else just bolt right up?I see Piers sells one. .

Thanks.

Chuck

 

[bgilbert]

Do you have any exhaust leaks? Joe Donnelly made 799hp with a oem manifold. Lots of other things to put that money on... IMO if its not leaking, and hasn't broke an ear off, stick with it, put the cash on something else... .

 

[csnider]

No,

No leaks that I can see. i was just wondering if ,along with the better fit it would have a performance/economy advantage.....

 

[24V-DSL]

I seriously doubt you'll see any performance/economy improvement, but it's sure a quality peace, and when you consider the price of a replacement OEM, it's worth it.

 

[Greenleaf]

I cannot verify this by directing you to the thread..... however it was stated by P Bob or Dave that the OEM unit, ported polished a bit will net better results than a non ported ATS unit.



So my understanding is to flow the OEM unit and modify the mountind hole size and you'll be big$$$ ahead as opposed to buying the ATS and having to port it to gain any results.



That said. I'm installing one for looks alone, not performance. They be cool!



GL

 

[paccool]

When Iput the ATS on my truck I had HDM48 port it for me. He matched the gasket. In some areas he had to remove 1/4" of material. It works about the same as the stock one as far as boost goes.



But like Greenleaf said, it looks cool!

 

[boatpuller]

Like Stan said the ATS is very restrictive in stock form. The original manifold on my truck looked like it would flow better, had to hog out over 1/4" in a few spots to gasket match my ATS. If you are just buying it for more flow then it's not worth the money in my opinion, but it is a very nice thing to look at and you won't have to worry about spitting out the exhaust gaskets.





Caleb

 

[BushWakr - RIP]

In my opinion there will always be "some" movement of the two parts in relation to each other.

I ported out my OEM manifold, opened up the two bolt holes that were smaller than the rest and slapped 'er back on.

I would say I gained/lost about 70'ish *F in EGT's... not bad for a stock iron part. I still have some gasket creep though. It is almost unavoidable as we go higher into the boost range... the more boost, the more likely you are to push an exhaust manifold gasket out. Heck, even stock trucks running more or less stock boost numbers suffer from this... next chance you get, look under the hood of a 1st gen and peek at cylinders' 1 and 2. They are the most notorious for this.

If you do some porting on your stocker, take your time and follow Dave's directions. That will get you on the road... just use care when you're working on the area's around the sidewalls of the manifold... they're not as thick as you might think.

When your done, drill out the two smaller bolt holes ONE size larger than the existing hole, not more than that. (just my opinion, but you don't want to take any extra chances of having an ear break)

The ATS will do a better job than a stocker when both are in original condition... I can't speak for the ported stocker vs the ported ATS... . however, I'd hazard a guess that on a flow bench the ported ATS will show an improvement over the most carefully ported stock manifold...



pb... .

 

[JLEONARD]

1st gen and peek at cylinders' 1 and 2

Yup... I have a slight leak on number 1. Gotta get that fixed one of these days.

Bob... can you give an estimate of how long it would take to port the manifold?

Jay

 

[Joseph Donnelly]

I made the 799. 9 run on an ATS, ported. I can't show you any runs over 800 or I'd have to kill ya



Check your stocker for shrinkage, that is what causes the gaskets to squirm out and the bolts to break or to break the ears off the head. The manifold will shrink over 1/4" lengthwise.

 

[JLEONARD]

Check your stocker for shrinkage

I could have fun with that :-laf :-laf

Jay

 

[Greenleaf]

That's Jay's attempt at humor... ... . he needs some new material J. D. and you just happened to be at the wrong place at the wrong time. We have all fallen subject to his prey :-laf



GL

 

[BushWakr - RIP]

Ahhhhh... . poor Joe... see, he's using CTD vers. 5. 1 and we are all still using vers. 1. 5, hence the ease with which Jay caught him...

Hey Joe, these guys function on a more "basic" level... . know what I mean



I do agree with Joe though,,, the stock manifolds do shrink. I think that is why I've had "some" luck with opening up the two smaller bolt holes... it seems like the manifold has the "feedom" to shift and return... that may be way out in the left field so don't quote me ok. .

Again,when we push more EGT's and boost pressures the manifold reacts alot more... the only 'saving grace' is that the gaskets are cheap and easy to change if you loose one or two over time.

I've had my most recent one's in for about 1 year now and I do see a touch of the #1 starting to protrude but still no sign of soot/exhaust escaping so I'm still ok to go...



Jay, I spent about 3 or 4 hours and lots of dremel attachments at home doing the initial work, then finished it up in the shop with some of Piers' tools. It worked out quite nicely too.

I think that Dave has a very detailed process he uses and his time's may be alot more than mine. I didn't want to go too far and find that I had a useless paperweight on my hands ... . it was also my first attempt at it too.

It turned out not too bad for my first try.

One thing to keep in mind if you are going to "attack" the turbo exhaust housing inlet... don't over do it... you can end up with a situation were you loose ground due to velocity reduction from over porting... or so I'm told.



pb...

 

[hdm48]

Pastor Bob,

words of wisdom as usual.



You guys listen to him

 

[mudcat]

Like has been said before if it isn't shrinking I wouldn't worry about it. Mine had shrunk so much that the bolts in the ends were bent at a pretty good angle. I didn't notice any noticable improvment over the stocker.

 

[JLEONARD]

Bob... thanks for the info. I just wanted to get a ballpark idea on how much time to allot for the job if I decide to tackle it.

Jay