Divided T4 Tubular Header

[Bender]

I have been checking out different setups, and had a couple of questions.

For those who don't know, the divided design is to keep the exhaust pulses (from cylidners 1&4 and 2&3) separated all the way to the turbine wheel. This decreases turbulence, and increases spool up.

The main contender I am looking at is a custom made one from Punishment Racing. I have also checked out the DNP one, but I noticed that it uses a single wastegate. This saves money, but by having both sides share a common wastegate, doesn't this defeat the purpose of using a divided manifold? Below are some pictures for reference.

<img src=http://www.punishment-racing.com/files/QuickSiteImages/dnpt4.jpg> <br>
<img src=http://www.punishment-racing.com/dividedhousing.jpg>

Another question I have is... is it worth the extra money to go ball bearing? Or would it be in my better interest to go with a journal bearing, then use nitrous for spool up. It would be about $1200 to go with a journal bearing and a zex turbo nitrous kit.

Thanks,
Mike.

 

[Turbo Monk3y]

The DNP design is exactly what you have noticed. It is divided but your right about them sharing a wastegate port. The actual pulses of exhaust will still help spoolup but a manifold that is TRUE divided will be even better as it will help not only the pulses of exhaust but Pressure won't be effected by the opposite runner. The only reasons why I went with a DNP divided t4 was because: For one topstreet made 830+awhp on the Divided dnp t4, it saves my from buying 2 Tial 44 wastegates, I hate adding extra weight to my car, It gives me more engine bay room, and If I truly cared about spoolup I would still be rocking a 50 trim turbo... If I were to get another manifold it would be a Shearer Fab top mount divided.

If your a big nitrous user then go with a journal bearing turbo. basically all the ball bearing does it help transient boost inbetween gear recovery alot better than journal turbos. Yes it might give you 3-500rpms sooner initial spoolup but thats all relative if your going to be using nitrous. I had a 35R before my t-67 dbb and it must say after that turbo I will never go back to journal bearing. Just because of the response, but I never used nitrous either...

 

[Bender]

Thanks, thats what I was looking for about the manifolds. Now if only someone can point me in the right direction about using ball bearing turbo, or journal bearing with spray.

 

[Bender]

Hmm, must have missed the second paragraph the first time, or you just edited it in there . Either way, I have an automatic, so transient boost between shifts is not an issue for me. The issue for me is building spool fast enough to lower the powerband enough for me to get most of the "sweet spot." Luckily for me, my trans shifts at 7500 rpm. (not that good I know, but better than 7k for stock) I am still looking into maybe putting a potentiometer on the tach wire going to the tcu to kind of "trick it" a little bit. That or go with a manumatic shifter.

I am not a big stickler on nitrous, and would prefer not to use it. I was just wondering if it would be better for me to use it with a journal bearing though. The only reason I would go with journal would be for the ease of rebuilding, no oil restrictor, and no inline oil filter. Another bonus would be no water lines going to the turbo. This will help keep my radiator cooler, and will make it a lot easier to take the turbo off. The downside would be the chance of blowing my intake manifold (or worse) with nitrous. Needless to say, I still may need to use nitrous with a ball bearing turbo.

 

[Turbo Monk3y]

I put a 10 micron -4 An filter right off the oil feed from the filter housing. this 35R I had lasted 2 years and is still going on my friends car whom I sold it too. Just keep bb turbos filtered and they will be around for many years... Forgot to mention though, Ball bearing turbos are watercooled so that they will last longer and will have extra water lines going in and out of the turbo... unless you get into the GT-ghey series of turbonetics which cost 1600-2200 for 35R type turbos... Not a fan of the high price on those...

 

[Bender]

Yeah I am just going to go with ball bearing for the initial spool characteristics. Plus, I have already dumped so much money in my car, that what is another 100 for another filter? If anything, it is only going to help. Plus with my external oil cooler, it may help cool my water a little bit.

Also any word on why I am still new member? I have been here way longer than 30 days, and i have over 50 posts. ???

Also, Thanks for all your help.

 

[twicks69]

The DNP design is exactly what you have noticed. It is divided but your right about them sharing a wastegate port. The actual pulses of exhaust will still help spoolup but a manifold that is TRUE divided will be even better as it will help not only the pulses of exhaust but Pressure won't be effected by the opposite runner. The only reasons why I went with a DNP divided t4 was because: For one topstreet made 830+awhp on the Divided dnp t4, it saves my from buying 2 Tial 44 wastegates, I hate adding extra weight to my car, It gives me more engine bay room, and If I truly cared about spoolup I would still be rocking a 50 trim turbo... If I were to get another manifold it would be a Shearer Fab top mount divided.

If your a big nitrous user then go with a journal bearing turbo. basically all the ball bearing does it help transient boost inbetween gear recovery alot better than journal turbos. Yes it might give you 3-500rpms sooner initial spoolup but thats all relative if your going to be using nitrous. I had a 35R before my t-67 dbb and it must say after that turbo I will never go back to journal bearing. Just because of the response, but I never used nitrous either...

Jake actually made 782whp on a superflow 2wd, then converted it to dynojet numbers to get 828whp. Unfortunately, Jake's manifold cracked along the wastegate runner shortly after he installed it (it didn't even change colors yet). He ended up returning it to DNP for a replacement (looked like a bad weld that lacked penetration), and then he made his own seriously BADASS twin wastegate divided flange T4 manifold out of 304 Stainless Sch 10 90*'s.

Also, I am using the SAME DNP manifold on my car without issues; no cracks, no problems with my 4088R. The car has put down 740AWHP/700tq at 49psi. I have had it installed for 2 years without major problems. I have resurfaced the manifold flange (to head) once, because it was warping, but easily fixed.

Personally, I like the one that Jake made better than the DNP, but for the "bang-for-the-buck", the DN Performance T4 tubular manifold is WORTH it!

I also agree with the ball bearing turbo choice. Extremely streetable.