juggernaut1

I changed to a 3.5 inch dump off my GT30 turbine together with 3.5 inch exhaust on my SR and made 40 more hp at 4000 rpm at the same time I swapped out a GT3071 to a 52T 3076. So I concur with DP's previous comments. Your boost curve does seem lazy for that size turbo - 19psi at 4,000! Also you can see the power fall over up top and converges towards the lower boost setting even though more boost is being used. IMO there is an exhaust restriction post turbine housing.

Here's another which shows the additional relay required to run the fans in series to obtain the low speed fan. http://omgpham.com/nissan-s15-thermo-fan-setup

Agreed they work very well on those Nissan's DP. But if thermos didn't work the world would also be full of dead and dying Commodores, Falcons, Toyota's and every front wheel driver too. I have personally found the Falcon AU fan setup very reliable and very effective on my S15. Even on low speed air is pulled through both the air-con condensor and intercooler. My FG G6ET also runs a similar dual speed setup from the factory and works a treat - high fan speed rarely comes on - as the low fan speed is sufficient for most conditions here in WA. My brother's twin turbo VZ Commodore has no probs with the factory thermo fan setup either. They key IMO is use a decent shroud coupled with an adjustable fan speed controller and from then on its a case of trial and error. Also pretty sure most manufacturers base their temps off the ECU temp sensor rather than a radiator temp sensor. I did use a Davies Craig thermo fan conversion on my Escort RS2000 back in the day with the probe in the top of the radiator inlet, as per the instructions, and it was a total fail.

Lol...the above pics were the start of something that ended up morphing into this:

Here is my hi/low speed Falcon AU fan setup controlled by an Autronic through a modified fuse box (for dual fans) and stock ECU temp sensor in my S15. Low on at 85 and off at 80. Not sure what the high settings are as it doesn't exceed 85 once the low fan speed cuts in. In your case you could go a dedicated adjustable fan controller which would allow you to adjust temps accordingly. http://www.spal-usa.com/fans/automated/accessories/fanpwm.html

Refer post 140 showing a GT3076 with twin scroll .82 ex hsg on an RB....once again note the linear nature of the curve. http://www.skylinesaustralia.com/forums/topic/269782-twin-scroll-vs-single/page-7

GTX3071 is more of a sideways step IMO. Slot a Forced Performance FP3076 into your existing exhaust housing....GeeTeeTee has proven back to back better response and power over his GT3076. Might be what you are looking for minimal changes and for minimal cost. Link: http://www.skylinesaustralia.com/forums/topic/426059-forced-performance-hta-turbos/ If you have your heart set on a twin-scroll setup (and prepared to spend the dollars) then I'd be looking to the Borg Warner EFR series of turbo's as these can be had in external or internal gate twin scroll form. Internal gate would save a lot of fabrication work. FWIW here's an early graph of my 3071 TS .78 (s15) during tuning overlayed onto a tradition single scroll 3071 setup (on a different s15) which shows the more linear nature of a twin scroll setup which may go to some way as to why some may say they don't hit as hard compared to a single scroll setup.

Take 2 Shoot4 http://i198.photobucket.com/albums/aa292/The_Boganxr6t/DSCF0007-1.jpg Shoot 4F http://i198.photobucket.com/albums/aa292/The_Boganxr6t/DSCF0006-1.jpg Shoot 6 http://i198.photobucket.com/albums/aa292/The_Boganxr6t/DSCF0005.jpg Shoot 6F http://i198.photobucket.com/albums/aa292/The_Boganxr6t/DSCF0004-2.jpg Shoot 8 http://i198.photobucket.com/albums/aa292/The_Boganxr6t/DSCF0003.jpg Shoot 8F http://i198.photobucket.com/albums/aa292/The_Boganxr6t/DSCF0002-2.jpg Shoot 6F - Hot intake probe http://i198.photobucket.com/albums/aa292/The_Boganxr6t/DSCF0009-1.jpg No Shootout Mode http://i198.photobucket.com/albums/aa292/The_Boganxr6t/DSCF0008-1.jpg

http://i198.photobucket.com/albums/aa292/The_Boganxr6t/DSCF0007-1.jpg

Whilst not directly on topic - post 17 of the following link shows the different hp figures obtained using different shootout modes with the same car on the same day ( I knew turbo 4 cylinders were handicapped in shoot 4F ). Notably, the second last dyno shows the effect on hp when the temp probe is placed near a heat source. http://www.fordxr6turbo.com/forum/topic/59178-power-differences-between-shootout-modes/?hl=dyno

One of the Ford boys on Xr6turbo made just under 450rwks with an internal gated GTX3576 (1.06) through a ZF on E85 with just a tune, injectors, cooler and exhaust so the compressor is able to flow that sort of power.

I currently use the Gizzmo one on my SR - no issues in the last 6 years. Make sure you have enough length on your studs to fit the spacer. I also have a Circuit Sports one which I got through FRSport. Anyway, scroll down and select desired model. http://gizzmousa.com/thermal-gasket.html

Enter the GTX3576 on E85 and GTX3582.....

Have used these with success. http://www.turbosmart.com.au/news/how-strong-are-your-hose-clamps

Pretty sure the HKS ex housing (as used on PJ's car) on are only T25 size so amazed the small inlets can flow that power.

PJ's dyno running a GT3076/3037 with HKS 1.06 (from memory) ex hsg on an SR20. Over 500hp on E85. From memory it set some kind of Australian quarter mile record at the time in that state of tune.

Gee's what volume increases as you guys seeing. I've had it done to ex hsgs and the volume is miniscule/immeasurable.

Are you saying extrude honing increases lag or the stock manifolds increase lag?

Just throwing this out there .....extrude honing the turbo comp cover and ex hsg.....and stock ex manifolds if that is what you are using.

Scott.....so your saying wrapping is fine then?

Running a GT3071 initially and then a GT3076 from 2008/9. When i had mine coated it was double coated and inside (as far as possible) and out. Can't comment on whether there was a heat/spool/hp advantage as i had it done from the get go. Suffice to say nothing has melted and paint on the bonnet hasn't bubbled/blistered. In theory, I would expect a spool/hp advantage. Got my beanie from here (although mine had the Garret logo at the time): http://www.horsepowerinabox.com/thermal-products/ The beanie certainly makes a difference as you can put your hand on it minutes after shutting down. Dump pipe would be the next major source of heat but reluctant to wrap it as I've heard this can cause it to "overheat" and cause metal fatigue. Perhaps heat shielding with the ACL stuff.

I've ceramic coated the full race manifold on my SR and everything back to the cat......even the intercooler pipes...lol. Turbo beanie on the ex housing. Its still like a furnace in the engine bay. ACL heat shields and vented bonnet would be the next step.

Looks like only one comp cover option now.......the forced performance comp cover. http://store.forcedperformance.net/merchant2/merchant.mvc?Screen=PROD&Store_Code=FP&Product_Code=NTGT3076HTA&Category_Code=Turbo-FP

Your call with running one gate on a twin scroll setup. I'm saying either a T3 1.01 or T4 1.06 but you would need to buy the hsg separately such as from GCG or the like. Personally, if it were my car and I was budget conscious I'd stick with a single scroll setup with the HTA 3076 and run a 3.5 inch dump back to the cat to get the turbo on boost as soon as possible. I run a twin scroll twin gate setup on my SR20 and love it.....but money was of no concern to me.

If your going to go a HTA 3076 twin scroll and wan't 330rwkw on pump fuel then I would suggest a T3 1.01 or T4 1.06 twin scroll ex hsg. I would also suggest a twin gate twin scroll manifold over a single ...so then the costs start adding up once the associated plumbing is also factored in. Running a HTA3076 or even a GTX3076 on a .78 twin scroll hsg will just limit the top end potential of these turbos with potentially additional lag over the Garrett GT counterparts. The biggest GT30 turbo I would run with the .78 hsg on pump fuel would be a T56 GT3076 and event then I'd say it could limit the top end potential of that turbo. I'm not even sure I would run a GT30 size .78 twin scroll hsg on a RB 25 period given your hp goals on pump fuel.