Cengineer

I am running a gt3582r turbo (powerlab kit) and I am curious how the spool (start rpm and full boost rpm) time compares to a GTX4088r (for lets say a 0.85 and 1.06 AR).

Since this is a relatively new turbo, I am having trouble finding information across various platforms.

It seems like many individuals are running a GTX35r (1.06 ar?) for 600 whp ish

I looked at the compressor maps and the gtx40 accomplishes my goal however I worry that it'll feel "laggy". In other words, I just want full boost <4500 rpms ( for my goal of 650-700 whp).

Are there better options (precision, borg warner??)? How effective is the new "gtx" technology vs the 1st gen ball bearing turbos?

also did anyone ever run uprev tuning software with hpx maf sensor for 650-700 whp goal? I'm not worried about driveability since this is not a daily, and I recently picked up ac/dc tig welding as well.

https://www.turbobygarrett.com/turbo...mass_flow_rate
https://www.turbobygarrett.com/turbo...rgers/gtx4088r

Here are my calculations

Goal 675 whp* 1.15 (drivetrain loss)= 776.25/ 10.5 (check link) = 73.93 lb/min

73.93/0.076= 972.74 cfm

972.74= [214 (cid)* 7200 (rpms)* 0.5* 0.92* Press.Ratio] / 1728... solve for Press. ratio= 2.37 == approx. 20 psi of boost

(as per Corky Bell maximum boost)


Sorry for the long post

04 g35 6mt

venture210

Hmm, I say either a GTX3582R gen II or or the GTX3584RS will meet your goals and still spool decently. Keep the same or similar A/R on the turbine housing you are running now. Maybe go 1 step up if you're willing to sacrifice a little response for more top end power

CK_32

iTrader: (1)

Every engine, every tune, every set up is different.

In theory yes it should get you there or about there. But again there is so many variables.

If you want a for sure 650whp - 700whp turbo precision 6266 or 6766 will get you there. Lots of guys my self included run this. I am only capped at 400whp now on 9lbs but many guys have gotten 650+ with these turbos on our motors.

Go over to dynasty tuning and look at their profile cars. They have tons of G's and Z's with good power numbers and share most of the specs including dyno sheet for references. I know they have more than a few precisions, I'm sure they have some Greddys as well.

As far as how they spool compared to the turbo you have now, or compared to the precision I can't say. But again that's a car dependent set up. I've been in identical 2j s13's and one spooled about 500-700 rpm faster than the other. But the one that spooled later was slightly faster when they raced.

It's just how it works out.

thatv35guy

iTrader: (1)

I'm shopping around for a new turbo too, just want to point out that fuel is going to be a major factor. You absolutely will not approach anywhere near 600whp on a GT35R or 6266 on pump gas on these motors. You'll need ethanol or race gas for sure.

BoostedProbe

iTrader: (9)

Couldn't be more wrong:






Boosted Performance mid mount turbo kit (so not even the much more efficient twin scroll kit) and 93 pump gas, with a PTE 6266 T4 .81 a/r turbine housing.

If the customer had gone for the .96 a/r T4 turbine, 650whp all day long with ease on 93 pump.

Seems like this forum still hasn't learned the benefits of a large turbine housings. It's like we are back to 2006.

The twin scroll Boosted Performance kit with the T4 1.15 a/r turbine is deep in the 700's at the wheels on E85 on the VHR engine...and at only 15psi.






OP, focus on the turbine size, not the compressor. Anything with a 62mm compressor will get you there.

Get this, with the 1.21 a/r housing, and you are SET:

https://www.atpturbo.com/mm5/merchan...de=GRT-TBO-566

thatv35guy

iTrader: (1)

^ OP has a PowerLab kit though...

Highway Riding

iTrader: (6)

I wonder if you elevation matters here in general with regards to making power on pump (93)! Between you and boosted. Just thinking aloud.

BoostedProbe

iTrader: (9)

That's why I linked that turbo...it would be a bolt on with a much larger turbine housing.

thatv35guy

iTrader: (1)

I was really interested in the GTX3584RS, it’s just so expensive.

I’ve been in contact with Pure Turbos and I’m sending my GT3582R out to them for a new billet compressor wheel (GT3588R upgrade) and 66mm turbine wheel. Should effectively be a 6266 with a Garrett GT BB core. They’ll be machining my 1.06 T3 exhaust housing to accept the 66mm turbine wheel and I’m upgrading to a S compressor cover that’ll also be machined for the bigger 88 wheel.

BoostedProbe

iTrader: (9)

^^^That's a waste of time/money. A big wheel in a small housing won't do anything. Bite the bullet, and get the right turbo.

Cengineer

@BoostedProbe

kind of have my mind made up on-- I was thinking the gtx4088r with a 0.95 ar t4 however the flange is divided.
Is there any negative effects from using a divided flange without having the proper piping feeding into it (for instance being detrimental to spool time vs normal open flange)? Would a t3 0.99 ar be sufficient (for my goals)?

https://www.exoticspeed.com/products...gtx4088r-turbo

Also back to original question, does everyone on z/g platform run standalone ecu system above 600 whp?

As for fuel, I have the flexibility to run 93 pump and E85 (chicagoland area)-- I found djamps posts very helpful in tuning the car

thatv35guy

iTrader: (1)

That GTX40’s a pretty big turbo to “only” be rated at 850hp

TT03Z

If your not already running a standalone I would highly consider it. Uprev does work and i have no idea what the limit with that is but I went stand alone for the safety perameters inputs/outputs and tuneability. After going with the Haltech I couldnt be more happy with it. Their customer service is excellent and Im getting used to the software and doing my own adjustments and such after I had someone build a tune for my previous turbo setup. The Haltech platinum pro is the way to go with these cars. Literally plug it in do a throttle calibration and its ready to tune. Unless you have inputs/outputs you want it to do then theres some wiring involved but no big deal.

Cengineer

@TT03Z

are you running a MAP sensor? If MAF which one (and what is your power level)?

Thanks

TT03Z

The Haltech comes with a built in map sensor good for 22psi. I have a Haltech 4 bar map I haven't installed yet. I'm running 20psi with twin FP black turbos. Made 575whp 575wtq on a mustang dyno.

BoostedProbe

iTrader: (9)

With your 675whp goal, you should be able to get close to it with the T3/V-band 1.11 a/r turbo on pump gas.

I wouldn't go with the twin scroll if you only have the tangential flange welded to your up-pipe. Kind of sad to have probably the most popular turbo size with such limited turbine housings.

I like the GTX3584RS on the compressor side, but they opted for a 62mm turbine...also a really bad decision.

thatv35guy

iTrader: (1)

So, I finally put my car back together with the upgraded GT3582R (Pure Turbos 6266). One thing I've noticed immediately, my exhaust back pressure ratio has dropped fairly significantly, I was previously seeing a ratio of 2 to 2.2:1 on my GT3582R, with the new 6266 upgrade I'm seeing an exhaust back pressure ratio of 1.6-1.7:1. I'm running the same 1.06 T3 exhaust housing too.

https://my350z.com/forum/forced-indu...gaskets-3.html

Cengineer

@thatv35guy

What kind of difference in spool/power do you see now?

Also, how do you measure exhaust back pressure ratio?

Do you think a gt4088r will fit in the location of the power lab kit?

Sorry for delayed reply

And thank you for your response

thatv35guy

iTrader: (1)

So, looking back at my previous logs I'm seeing peak boost come on about 500 rpm later with the Pure Turbos upgrade.

I'm measuring exhaust back pressure at the turbine housing via a ProEFI exhaust back pressure sensor, there's a small hole just above the inlet of the turbine housing where the pressure sensor threads into. This is the most accurate way to measure Exhaust BP.



The GT4088R should fit but you'll need to modify the hot and cold side of the kit.

thatv35guy

iTrader: (1)

I just wanted to point out this is 100% incorrect/false.

Installing a larger exhaust wheel into your existing turbine housing will make a massive difference in exhaust back pressure. I've confirmed it on my own car and now on WTFMike's PowerLab 350Z.

Both cars run exhaust back pressure sensors in the turbine housings and the data shows a significant reduction in exhaust back pressure.