Speqz

After lots of research on whether to upgrading turbine housing on 35r or hacking the uppipe for a t4 flange. Ive decided to opt for the 6266 turbo with t4.

Thoughts on using the .84 divided vs the .81 tangential. My goal is to make 550 to 575 whp on 93 octane. What diffrence in spool should be expected between the .divided vs tangential housing? How does spool on the 6266 compare to the 35r? Would love to make the upgrade but not to sacrifice precious low end power.

Also, i am concerned about engine bay temps. Anyone with a powerlab kit can attest to the wave of heat upon opening the engine bay. Will the air cooled precision add more heat compared to the water cooled garret?

No sense in adding all this extra power only to give it all back in heat soak.

thatv35guy

iTrader: (1)

How much power did you make with your 35R? Details on your current setup?

Speqz

400whp 8psi on stock block.

Stage 1 long block from ipp going in. Cjm stage 1 with walboro 255. Using uprev to tune

midz350

iTrader: (4)

I would go with the 6766 instead. You will make more power easier on pump gas.

I think the 6266 is small for the VQ. Even the evo/supra guys with smaller engines prefer the 6766 over the 6266.


And get the DW300 or even the walbro 485 instead of the walbro 255. The 255 suck. Its loud and will probably max out around 550whp on pump.

CK_32

iTrader: (1)

What's the spool and power difference of the 67 vs 62?? I'm almost about set on a 6266 cause I want to cap my stock block around 450 WHP.. But I KNOW my self and that down the road I will wnd up swapping pistons and rods and end up wanting to hit 600 ish.. Or close.

So my thinking is buy once cry once and get the 67.. But how bad is the spool? I don't wanna be sitting there for a week and then power kicks in at 6600 RPM.

But I've always wondered I know the 6266 is a favorite across the board, but like you said Honda guys can spoil that in the mid range, it always made me wonder if our 3.5 could spool a 67 equally or close and the 6266 is a little small for our motors. But googled by butt off and can't find much info or comparison to answer what I'm looking for.

Cause when looking up turbo'd 350's you always end up at the dead end of stance kids TT builds but never go above 20 MPH in fear of a stick in the road, or street rigs that never see the track or are built by a shop who doesn't disclose their info for obvious reasons.

How much better and what's the power/spool limitation for our VQ and the 67?? Talk me out of going 6266 lol

thatv35guy

iTrader: (1)

I don't think the 6266 is enough of a step up from a GT35R, I'd consider something bigger if you're going through all that trouble. I made just over 500whp on pump gas with my GT35R (1.06 housing w/stock exhaust manifolds), another local guy made 530whp on a PL 6266 w/pump gas. He eventually made 650whp on race gas and I made just over 600whp on E85. The spread only looked to be about 30whp.

A recent thread on this: https://my350z.com/forum/forced-indu...vs-6766-a.html

New PT6870 looks very promising

str8dum1

iTrader: (11)

they make 800 whp on 6266's. its more than enough for a 3.5L, esp if you are looking at the 600whp daily range.

midz350

iTrader: (4)

I'm running the S366 which is 66mm (6766 is 67mm) on my built 3.0 2jz and making full boost 21psi at around 4200RPM. The 6766 spools a little bit faster than the s366.

And on a 3.5 with the VQ high flowing heads it should spool faster. And also you can get a divided flange and the Sound Performance Quick Spool Valve if you like.


"You call it lag, I call it traction control"

CK_32

iTrader: (1)

If your talking to me the 450 would be the daily tune.

The 600 ish goal is for track days and strip racing.

I just don't want lag then BAM! Boost and I'm sharting my nice seats or having to wind it out until next week to feel ludacris speed

midz350

iTrader: (4)

Look who's talking, the guy with the TWIN 6262 turbos


Both turbos are almost the same price, spools very close to each others and he can make more power on 93 with the 6766.

CK_32

iTrader: (1)

That's the answer I was look for^^

Looks like I might be lookin to mount a 67 instead of a 62..

midz350

iTrader: (4)

Look for BP kit builds. Usually they come with the 6266/6766 turbos.

str8dum1

iTrader: (11)

67 is overkill for 600whp.

why add more lag when the 62 will easily surpass your highest goal. Any boost controller can tame the hit however you want it.

you'd only need like 10psi to hit 450whp on a 6266. they are 35psi turbos behind a VQ

Boosted Performance

iTrader: (14)

I am not sure why everybody wants to upgrade to a larger compressor, but keep the turbine small. If you are going with a 6266 (which is good for 650whp on pump gas) you need to go with the 1.32 a/r turbine, or the .96 a/r tangential. The .81 tangential and the 1.15 TS will get you 600 though, based on my customers results, but the larger turbine is not an issue with spool, as so many are concerned about it.

Speqz

Any dynos showing the .81 with 6266? Would shed some insight on this. After reading and looking at the plumbing of this kit. It seems like chopping up the uppipe would only make an already tight fit, even tighter.

I am almost thinking the 1.06 housing and meth is a more cost effective option while giving the cooling benefits to battle Florids heat. Cars get extremely hot here year round.

Unless there is a huge advantage i am more likely to stick with the gt35 and go for meth. My concern there would be control with uprev. Uprev has the ability to control multiple maps but, is there a way to build in a failsafe incase the pump fails?

Speqz

Part of the reason is $$. 350 for 1.06 vs. 1074 for 6266 plus cost of t4 flange and labor of fabbing it to the uppipe. Then there is the potential space issues. Almost a $1000 difference for what may be a 30whp bump?

I havnt seen any powerlab kit 6266 dynos to compare. Any from your mid mount kits with a built motor would be great to see.

Boosted Performance

iTrader: (14)

Mid mount kit, 6266 T4 .81 a/r, 93 octane, 9.5:1 short block...rest of engine bone stock:

CK_32

iTrader: (1)

From what data and graphs I've seen the 6766 spool roughly the same RPM. Maybe about 500RPM later in some cases.

But has more peak boost left to give if you wanna go higher. Which then takes a longer time to spool but it's having a higher boost output like you would to max out the 6266 vs say the 6766 which would be hardly bushing max boost to match the 6266 at full boost.

My only reason for considering it is because of the limited excess spool but major boost potential if I decide later to go more PSI I won't need to wind my turbo to max capsity or upgrade later.

IMO bigger is better in this case especially if both spool roughly the same RPM. But I'm just disputing for discussion and further thoughts and maybe learn something I'm missing. Im familiar with turbos but no guru so I wouldn't be surprised if I'm missing something or wrong about something here.