Why cast manifold? this spools so fast I don't get to enjoy the car off boost, It was great but i didn't like it because it was too violent.

No qs valve is needed and your rods will be on borrow time, donc soit modest and don't try to put reinvent the wheel.
Either turbos will make 600+

 

QS can hurt the top end power some. I would just go for a standard divided setup.
those cast manifolds are usually undivided and not sure how large you can go on the turbo with how they fit in there.

 

I am going cast for the spool time and due to the fact that i know with a cast it will clear the dizzy (since im looking at a treadstone cast and its made for the is300 which only came with a dizzy)\

and what makes you say that the rods are on borrowed time?
Ive heard of 2jzges go over 800 hp. is it the rod that snaps? Or is it the rod bolts?

 

im not shooting for a massive turbo for 1000hp or something like that. just a super fast streetable car (600-700 hp with good responsiveness). ive heard anything over 700hp isn't very street friendly. or it worse comes to worst, ill just cut a hole in the hood! hahahahaha don't think ive seen a sc with a turbo out the hood

and that's why I need a qsv. the cast is undivided and I want a .91 a/r twin scroll
and according to sound performances website, QSV wont hurt the top end power

 

Ethanol makes more HP and TQ than c16/q16 etc..

TQ kills your rods, about 700ft lbs of tq you are on borrow time and its also about how it comes on in the lower rpm.

At those power levels the weakest link on the jz are the rods700tq+ and the main caps ~900-1000hp.

You will not have to worry about spool time with 10.1 CR and ethanol with 60-67mm turbos.

 

well I did not know that. thanks for the heads up
and I wonder if cast vs tubular manifolds on e85 have been compared with the same turbos injectors and all that.
I wonder if there is still a spool difference.

and a good cast manifold is 400-500 while a quality tubular is 1500... hahaha
not trying to use any china made ebay special parts

 

yeah there is a difference between 800hp on pump and 800 hp on E85 and that is the massive amount of torque. I would take quicksc4's advice he has done it several times.

and the QS does hurt the top end power some, don't believe everything you read on the net. it is a trade off it helps the spool out if tuned correctly and it will shave some off the top end but most don't care. A proper divided stainless manifold with a divided turbo should spool fast enough anyways for the turbos you are using and you get unrestricted top end power.
The QS valve is actually for massive turbo's shooting for 1000hp, but your would have good spool already.

just get rid of the distributor or shorten it down and use coilpacks. do you really plan on running 600hp through 1 stock coil for a long time? you are going to loose power because of the gaps you will have to run. just get a regular manifold and spend the extra money on a ecu and coilpacks.

 

Ehhhhhhh marketing is beautiful.
It probably isn't a significant drop but there is clearly an obstruction being placed in the exhaust stream. Not major by any means but it's there.

 

The qsv has to be tune, You have to know where to close it and when to open or it will rob you some power..

One last time you do not need a QSV.

 

alright. thanks for the help guys!
i want to go with the coils but im having a hrd time figuring all that stuff out. ill have to do some more research into it.

and i saw the soundperfomance supra with a cast manifold and a QSV with a precision 6766 or 6266 can remember and it had a gorgeous torque curve
thats what made me want to try a QSV

maybe ill look into an undivided turbo now

 

Whoa whoa wait up. I think in general everyone says to go twin scroll turbo WITH a divided manifold. There was a thread back in the Evolution forums showing the benefit of open vs twin scroll.

 

proefi flex fuel set up...


problem solved

 

there is a difference though between the evo and the sc. aka number of cylinders. I don't necessarily think that something that applies to the evo also applies to the sc. from my understanding, which I could be wrong, smaller engines benefit more from twin scroll because they have less exhaust gas to spool the turbo. since the sc has more cylinders it would have more exhaust flow. so the twin scroll would not be as beneficial.

and its hard to find a good divided manifold for less than 1000 bucks. And I would prefer not to go china brand for quality purposes (aka don't want to have to spend 300 bucks on a manifold and another 500 bucks to get it to fit)

 

Yes divided manifold makes a difference.. I was a non believer till i tried it , you do see a difference.

 

Can't you tune the new Haltech 2000 for both pump and e85? Correct me if I'm wrong but that sounds like a hell of a compromise. In which case you should run the TT gasket just in case you want to run that high boost but only have pump gas available. Just putting my 2 cents in. I could be wrong.