wantboost

iTrader: (2)

I'm curious as to what pre-turbine backpressure is with the valve closed at cruise and under load.

I'm also curious as to how the QSV would help a smaller turbo like something in the 3076R range on a 1.8-2.0 vtec motor.

I think it would be funny to use a QSV on my 2871R with one of Garretts new T3 twin scroll turbine housings.

So much torques lol.

elijahcole92

That would be awesome! If you're interested i can get you one for cheaper than advertised!

So i realized i don't have a print out of what the car is set at now, but i do have a print out of the direct comparison after changing cam gears back to 0,0 and also the 19.5psi run that netted 564.



Here's my 07 335i for giggles..


Here's both the cars being washed today by my beautiful wifey!



Maybe Will can get me a copy of the final tune. It was around 510hp at 17-18psi which is what we left it at comfortably.

turbohatch96y7

iTrader: (15)

Good job man..




A mod should really go back and edit all the posts from the shodan and wantboost saying this is a stupid idea bla bla bla

rawperformance1

I don't know that that would be necessary. Hell, I tuned the car and I was a skeptic up until it was finished. The qsv works. It's a little too pricey for me personally, but that's neither here nor there.

turbohatch96y7

iTrader: (15)

Ill tell you right bow ive always wanted to do this and whenever a thread popped up asking about it the same people jumped in talking about how stupid it was to even think it would work.

Its one of the reasons i dont come around this section because over and over people are telling you how to make a cookie cutter setup and anything out of the box has been done and proven wrong

Well i guess it was all bs wasnt it?

rawperformance1

I suppose it was. I haven't seen their comments on the matter. I will say this in regards to trying new things in this industry/hobby/sport/whatever/: there are countless people who have self-proclaimed degrees in fluid dynamics, thermodynamics, aerodynamics, you name it. There aren't many people who will step outside the realm of the cookie cutter build and try something. My skepticism of the Qsv stopped at the point of "well that's another mechanical failure waiting to happen", and we moved on and tried it anyway. The results were rewarding. It will always be this way unfortunately. Pioneering even on the smallest scale in the honda world is basically dead.

wantboost

iTrader: (2)

I only said this was a bad idea because on most setups it would cause pre-turbine back pressure to skyrocket.

This was designed for larger turbos but I've seen a few people try putting them on smaller turbos with horrible results.

It's obvious that the gt35 has a large enough turbine side in this case to keep back pressure low otherwise he wouldn't be making the power and torque that he is.

Tony the Tiger

I am always about trying new things too, but it's really hard to achieve something that is good for all applications and driving conditions nowadays. There's always a compromise.

My old twin turbo sequential GT28 setup looked great on paper and on the dyno, but the switch over between the two turbos created a lot of issues for a circuit racing condition. It was great on a street drag pull rolling off 1st and banging through the gears as long as turbine RPM was kept at high speeds.

The QSV reminds me of that, when the switching between the two scrolls create a momentary flat spot due to a sudden change of engine VE and backpressure especially at part throttle or rapid throttle movements. The naturally delivered torque right off idle/low RPM's is also much weaker because it is essentially driving the car with half the A/R; to some people, they may not like the soggy throttle response from blipping the throttle or snapping the throttle open quickly at low RPM's. e.g. throttle response difference between small T28 Honda vs big T4 Honda. Big turbo Hondas are snappy off the line like as it if was an N/A engine at lower RPM's.

This QSV setup looks great so far, but I would not jump to conclusions right away whether this setup is a solid performer for all driving conditions. Some videos will help, like my old Integra ITB turbo videos showing spool and throttle response, and seeing my foot as I move the throttle at all different conditions.

rawperformance1

Cole may be interested in providing some video of the car in action. I
Doubt I have much time to spend helping with that.

Big fan of your cereal, Tony.

elijahcole92

update: A few weeks ago i ended up blowing a headgasket, have yet to pull the head as i moved recently. Don't know why yet, builder thinks the head may not have been perfectly flat when we build the bottom end, as we didn't have the head checked. But i was hoping for some advice..

While i have the head off i thought about swapping in a friends head who has a built RLZ ported head and new valves, etc.

Question: With a ported B16 head over my stock b16 head, would i gain or lose spool?
What about with oversized valves, how would they affect my spool?

Thanks!

wantboost

iTrader: (2)

higher head flow should mean more power, hard to say what it does to turbo response. If anything it should respond faster but it depends on the port work. If the ports have just been hogged out as big as they can go then no it won't spool faster, it will actually spool slower.

Big ports are lazy ports. They let exhaust gas velocity drop off so the gasses are moving slower vs a smaller port head. Slower exhaust gasses means less energy to spin the turbine and also allows the exhaust gasses to cool down more before reaching the turbine wheel, also meaning slower response times.

Turbos function off of exhaust gas velocity and exhaust gas temperature. Lower any of those two things and turbo performance declines

elijahcole92

That's what i assumed, but wanted to confirm my thoughts. Any thoughts about the valves?

I also thought about possibly downsizing to the TR3030R while i'm at it.

wantboost

iTrader: (2)

TR3030R would be a perfect turbo for your setup.

The larger valves increase flow somewhat but you're putting a bigger valve in a hole that still has the same amount of space between the stock valve and seat did. An old school hot rod trick is to cut the valve seats .5 over but not increase the valve size. The valves still seat just fine but you move more air around the valve than a larger valve.

A bunch of guys that had 1mm OS valves that installed GSC T1s had to go back down to .5 OS valves and they actually made a bit more power than the larger valves did due to more area fire air to flow past the valve.

elijahcole92

Finally put the head back on this week. Had a few valves that were not in the most optimal condition and cleaned up the short radius a little. Switched to a je pro seal gasket, Excited to see what it will do.

phaphon

I'd be interested in your gtx turbo if timing is right . But good luck on what you decide to do .

Kevinio

You will love that TR3030R!

elijahcole92

Decided just to keep the gtx3576, tired of switching setups and spending money. Just want to drive the car!

TheShodan

iTrader: (14)

Good choice. Those are getting harder to get nowadays.

elijahcole92

After almost a year I finally got the head back on and putting it back on the dyno tonight!

TheShodan

iTrader: (14)

Good luck, sir!!

rawperformance1

Ended up on 18-19psi, 493whp IIRC. Still making a **** ton of torque early in the powerband.

elijahcole92

Car did well, i was worried but everything went smoothly!! Car is healthy and still making gobs of power and torque down low.

Decided to put the car up for sale for anyone interested: https://honda-tech.com/vehicles-sale.../#post50664779

TheShodan

iTrader: (14)

So you go through all that...just to sell at a fraction of the good value. I guess I'll never understand.maybe I just don't get bored that easily.

elijahcole92

Sold the car, still have the 3576gtx turbo and QSV for sale! $1600 for turbo $250 for QSV or $1780 for both! Only 4k miles on both

TheShodan

iTrader: (14)

Post that up in the Classified: Forced Induction section.!! For the combination you got, easily worth $2100 BNIB