I really love when people say twin scroll chokes up top. If setup improperly I agree. But when setup corectly your so far from the truth. This thread is not based off of twin scroll. I stated I have used 5 different turbos on a twin scroll platform. It's my experience with them. My 10.1 was on 100oct 38 psi trapping 141 mph. It's far from choking anywhere. Its also a full 100% street car. On the dyno in 3rd gear at 8700 rpm I am just about finished making power.

Its all personal preference and what the driver likes.

 

Honestly man I care not to get into this discussion, I seen the test, I know the facts and have the knowledge on it. No reason for me to even go there with you.

 

Here is what Buschur says for the 86 vs 6262

https://www.evolutionm.net/forums/9691906-post85.html

I did answer this, I think. The 6262 was laggier and made less power. The fitment is also not identical last time I tried so it won't fit on my car and I'm not building a new header try it out.

I wouldn't even consider this turbo, now back between the 82 and 86, Buschur made a great post on this... If your not running 9's with the .82 it makes no sense in going to the 86... Something like that. Trying to find it.

 

its more peak power not more power. hta86 all day over the 6262. Not sure about the 6266.

 

How can it not flow less full tilt, the divider in the turbine housing decreases flow through the turbine. Someone do the math and measure the size of the divider, I bet it blocks 5-10% of the inducer's area. TS gives up some top end to gain down low, you can't have your cake and eat it.

 

do you even know wtf your talking about???? i have my cake with the sweetest icing and i eat it all day long.

maybe your comparing a .82 open to a .82 twin scroll. in that case your correct but you would have to be a dumb *** to not compensate for the divider. a TS 1.06 T4 is like a .82 open scroll housing. i have no issues uptop. my car has proven to me real world results. i know the facts i own the facts and i drive the facts. the only thing i have yet to figure out is how to make my flux capacitor work to make time travel possible. so dont argue with someone who can back it up. im not the greatest driver but my times speak for them self. even though i think they suck.

 

lol calm down, doesn't have to turn into an argument. So what turbo are you running is it the 86?

 

I would agree a properly designed twin scroll has more HP choking back pressure than a properly designed open scroll. This has been proven over and over but just not made public knowledge on this board. A drag race car doesnt even utilize the beneficial effects of twin scroll. which is better low rpm spool and transient spool. A drag car stays at high rpm from start to finish.

 

I do not agree. Maybe I have not seen the limit to my turbo yet. But it seems to work in par with every other setup

I use the hta86

 

The limit is a huge factor. Most users will not push their turbos hard enough to see the difference in overall power potential between single and twin scrolls. There is no real sense in arguing about the absolute peak power from one turbine style versus another, unless you are wringing the most from the turbo. A turbo that makes 10% more average power will be quicker than a car that makes 10% more peak power.

For most users, the divided housings easily show their advantages in efficiency and spool. Some people will doubt or dislike the housings, and there is nothing wrong with it. Happens with everything.

 

I wasn't aware that full boost with a gt45r can be obtained by 5k. Take your sarcasm somewhere else.

 

I was reading an old thread on mlr and it reminded me of this post, quote from Geoff at full race;

"Regarding the GT30 and GT35 turbchargers - they are based on the GT28R frame/bearing housing/chra. As a result it uses a very short/narrow turbine wheel. When used on a divided twinscroll housing with a thick divider in the middle of the turbine wheel, this causes reduced flow area at the turbine wheel inlet and is a major reason why the gt turbos are not ideal for twinscroll applications."

Seems to back up what I said. I don't have a TS 35r housing here but Im sure someone cound measure the divider area? Personally I don't think 141mph is impressive at 40psi with a HTA86, the turbo should be capable of alot more. I bet your exhaust backpressure is high, have you measured it? I'm not having a go at you Dan so don't take it that way.