[CamaRai]

So if the 750 and Ps2 both spool at same rpm, what’s the downside to the 750?

Same spool, and the available 100 more hp.. what am I missing?

Is the 750 basically the PS2 version 2?

[mike@x-ph.com]

Originally Posted by CamaRai

So if the 750 and Ps2 both spool at same rpm, what's the downside to the 750?

Same spool, and the available 100 more hp.. what am I missing?

Is the 750 basically the PS2 version 2?

I don't see any data to compare both kits, but since the pure750 is a larger turbo that makes more power on high RPM, it probably does not spool as fast as stage 2.

We'll have to wait and see for a 100% accurate answer.

Houtan from the one series forum used a prototype of the Pure750; it was called PS3 at the time. He posted a lot of data.

[AmuroRay]

Originally Posted by mike@x-ph.com

I don't see any data to compare both kits, but since the pure750 is a larger turbo that makes more power on high RPM, it probably does not spool as fast as stage 2.

We'll have to wait and see for a 100% accurate answer.

Houtan from the one series forum used a prototype of the Pure750; it was called PS3 at the time. He posted a lot of data.

Perhaps, but that dyno shows it spooling 500rpm sooner than a PS2. I bet it’s the slightly better exhaust manifold that helps.

[ksalih]

Very excited for dyno sheets vs. OE! This sounds like a fantastic option for us track day goers that appreciate the OE spool characteristics but would like increased power at the top of the rev range! - would love to pair with an upgrade HPFP for E85 (tired of mixing for E20)!

[3t3p]

Holy crap Pure 500 is the ultimate stage 1 turbo?!
I've been considering dinan more and more. Being in NZ means TTe460 is like double the price in UK/Europe.

If the 500 has stock spool and I can buy the turbo out right (car is my daily for work and can't be arsed sending a core to the states) then it's seriously compelling.

Will probably have to go BM3 to get an OTS tune as MHD doesn't seem to accommodate stage 1 turbo upgrades?

[carchrism5]

I'm interested to see the Pure500 with simple fueling upgrades on 93 to see if we can get notable bump in power without sacrificing too much mid range and straightforward tuning through BM3.

On prior cars I've done the whole process where you get involved on the turbo customizing, then getting it on and scheduling custom dyno sessions, refining everything to get exactly what you want. It was a nice result but took so much focus on time which is not where I'm at now. I'd like a reliable upgrade where you could get everything, have the shop install it, tune it and be on your way.

[ZM2]

Originally Posted by carchrism5

I'm interested to see the Pure500 with simple fueling upgrades on 93 to see if we can get notable bump in power without sacrificing too much mid range and straightforward tuning through BM3.

On prior cars I've done the whole process where you get involved on the turbo customizing, then getting it on and scheduling custom dyno sessions, refining everything to get exactly what you want. It was a nice result but took so much focus on time which is not where I'm at now. I'd like a reliable upgrade where you could get everything, have the shop install it, tune it and be on your way.

You won’t get far on 93 with the 500, you’ll be octane limited. The PS2 only does 440whp on 93. Doubt you’d get 420whp with the 500.

Stg 2+ Multimap with the PTF Flex Fuel sensor and E40-60 is as easy as it gets to add power. Guessing you’d hit 480whp with the Pure 500: https://f87.bimmerpost.com/forums/sh....php?t=1884838

[///393]

93 is definitely a limitation. I’m very interested in finding out the limit of 93 with a Pure500 and custom tune as I’m not interested in a flex sensors or E85 currently.

[ZM2]

Originally Posted by wilson kop

93 is definitely a limitation. I’m very interested in finding out the limit of 93 with a Pure500 and custom tune as I’m not interested in a flex sensors or E85 currently.

Supposedly similar results with a race gas tune as E85, but I never went that path, as race gas is 4x more expensive and generates more heat than ethanol.

But, if you can’t find pump E85 easily, buying cans of it is just as expensive as race gas.

[///393]

E85 isn’t near my track sadly so most lug it in. $14.00gal for 100oct gets stupid quick when you drink it as quickly as you do out there.

I may end up resorting to E85 mix for a more powerful street tune if 93 really won’t do 420whp but I think it will get there. Barely. We shall see, but I definitely won’t be lugging jugs of it to the track.

Full boost at 3.5k with the Pure750 is interesting though as the power band looks great considering where you live on track. I have a pal with a PS2 car that’s about to get tuned on corn so I’ll get seat time in it to see if I could live with those spool characteristics or not.

[ZM2]

Originally Posted by wilson kop

E85 isn’t near my track sadly so most lug it in. $14.00gal for 100oct gets stupid quick when you drink it as quickly as you do out there.

I may end up resorting to E85 mix for a more powerful street tune if 93 really won’t do 420whp but I think it will get there. Barely. We shall see, but I definitely won’t be lugging jugs of it to the track.

Full boost at 3.5k with the Pure750 is interesting though as the power band looks great considering where you live on track. I have a pal with a PS2 car that’s about to get tuned on corn so I’ll get seat time in it to see if I could live with those spool characteristics or not.

A dialed back tune on a larger turbo is definitely better for the track (less heat) vs a smaller turbo that’s max’ed out, but that’d be a terrible drivability map around town. Would need the hot map for around town to reduce spool/lag. But, I know you know this.

Will be interesting to see how the 750 spool compares to the PS2.

[///393]

Shame we can’t have it all. Each choice has pluses and minuses.

I’m telling myself I can be satisfied with 430-440whp on 100oct with the Pure500 since it sees more street duty than track.

Pure500, HPFP, and a custom Bend Cal tune has to be better than stock turbo/fueling and BM3. I think I’ll get my moneys worth. Only one way to find out.

[carchrism5]

Originally Posted by wilson kop

93 is definitely a limitation. I’m very interested in finding out the limit of 93 with a Pure500 and custom tune as I’m not interested in a flex sensors or E85 currently.

Same for me, I know 93 is a limiting factor but it's what I'd want for ease. I don't want to work with E85 mixtures and certainly not looking around for race gas. For guys that track and chasing down time, I totally understand that but I just want it for around town driving. Also it wasn't just peak hp for me but also area under the curve, although more linear power would be nice versus falling off in the top end.

[3t3p]

I echo others. Have no availability and no interest in going beyond 98 RON pump fuel.

I want stock like spool for road use only.
I don't have power target requirements beyond better extension into redline.

'just' 430-440 WHP is alot for the chassis and tyres already IMO.

[AmuroRay]

I think you can do 420whp on the stock turbo, on pump (HPFP is needed) but you’re going to lose a lot toward redline. A Pure 500 might do that with less heat - but is it worth $1000 for 40whp at redline?

I got bought a house, got married and now I’m a father all in a year and a half - so I haven’t been able to do all that I wanted to with the car.
If the S55 is any indication (and if I ever have a chance to install the MILVS) You could make an extra 20-25whp at redline on the stock turbo, and give a powerband that’s likely similar to what the P500 could do.

[F87source]

Originally Posted by AmuroRay

I think you can do 420whp on the stock turbo, and pump, but you’re going to lose a lot toward redline. A Pure 500 might do that with less heat - but is it worth $1000 for 40whp at redline?

The increases in area under the curve throughout the entire rev range will be worth it. Plus a lot less back pressure, and less strain on the turbo will make the car more reliable.

[AmuroRay]

Originally Posted by F87source

The increases in area under the curve throughout the entire rev range will be worth it. Plus a lot less back pressure, and less strain on the turbo will make the car more reliable.

I actually agree.

But just for reference- this is 440whp on the stock turbo. He did it on pump, HPFP and a custom tune-

https://f30.bimmerpost.com/forums/sh...1622618&page=3

But he did it how all the PWG guys used to make their big power, by making the power in the midrange before 5500RPM. So the advantage to the P500 isn’t going to be peak power, but the shape of the power curve.

[Mellow Yellow]

Ive got a set of the 750s on order. Glad I didn't install this ps2 yet lol

[F87source]

Originally Posted by AmuroRay

I actually agree.

But just for reference- this is 440whp on the stock turbo. He did it on pump, HPFP and a custom tune-

https://f30.bimmerpost.com/forums/sh...1622618&page=3

But he did it how all the PWG guys used to make their big power, by making the power in the midrange before 5500RPM. So the advantage to the P500 isn’t going to be peak power, but the shape of the power curve.

Yeah those numbers were crazy (especially on pump gas), there is no way the turbo will last a super long time being pushed that hard. Back pressure must be nuts too. But if those same tactics are used on the pure 500 we could potentially see 500 whp.

[ZM2]

Well, I hit 494whp with my TTE460 on E50 with a 23psi and 15+ deg map, but power dropped to less than the Stg 2+ MM on E50 bn 5.7k to redline, so it’s doable, but makes no sense.

[F87source]

Originally Posted by ZM2

Well, I hit 494whp with my TTE460 on E50 with a 23psi and 15+ deg map, but power dropped to less than the Stg 2+ MM on E50 bn 5.7k to redline, so it’s doable, but makes no sense.

Strange, why did the power drop to less than stage 2+?

It should have atleast held on longer because the turbo can flow more.

[ZM2]

Originally Posted by F87source

Strange, why did the power drop to less than stage 2+?

It should have atleast held on longer because the turbo can flow more.

It takes E70-E85 on a Stg 1 turbo to hold that kind of power up top. My Dorch Stg 1 HPFP can’t handle that and I don’t want to run that high of an Emix, so happy with the Stg 2+ MM, E50, flat power to redline, and super clean logs.

https://f87.bimmerpost.com/forums/sh...0&postcount=23