F1 EFR 7670 Twinscroll External Wastegate Full-Race kit install
Joined: Mar 2013
Posts: 316
Likes: 6
BW EFR turbos should have the best spool. TTBOMK are the only turbos with titanium aluminide turbine blades. Garrett went with hi-temp MAR-M on the new G-series, but that isn't lightweight.
For some reason Full-Race doesn't list their kit with an internal wastegate divided T4, but I imagine they would build it. The 1.05 AR EWG T4 they list with their manifolds should scroll as fast as the .92 AR twin scroll on a IWG T4 manifold, although the spooling difference should be small. Give them a call. Note that they build an EFR IWG manifold for the Supra with a 2JZ-GTE, so it wasn't an IWG issue.
I don't think there is any reason to not use the IWG on the EFR and its built in recirculating BOV. It also comes with a 3-port boost controller mounted on the compressor housing. Common changes are to use the Turbosmart IWG wastegate controller, a direct fit, and either Turbosmart recirculating Kompact BOV (they have a model that screws as a direct replacement) or the Full-Race aluminum cover over the EFR BOV.
There is a guy running a compound turbo S2000 with two EFRs. Videos on YouTube and I believe a thread here.
Sound Performance has a Quick Spool Valve (not cheap) that fits between a twin scroll T4 turbine housing and a non-divided T4 manifold. It has a flapper that directs the flow to one scroll. 4 years ago BW displayed an EFR turbine housing that had a similar flapper built into the housing so it could use a divided T4 manifold, but it apparently never made production.
Then, of course, there is anti-lag. BW has a speed sensor for the EFR and an EGT sensor may also be helpful to avoid excessive turbine spool or temps.
For some reason Full-Race doesn't list their kit with an internal wastegate divided T4, but I imagine they would build it. The 1.05 AR EWG T4 they list with their manifolds should scroll as fast as the .92 AR twin scroll on a IWG T4 manifold, although the spooling difference should be small. Give them a call. Note that they build an EFR IWG manifold for the Supra with a 2JZ-GTE, so it wasn't an IWG issue.
I don't think there is any reason to not use the IWG on the EFR and its built in recirculating BOV. It also comes with a 3-port boost controller mounted on the compressor housing. Common changes are to use the Turbosmart IWG wastegate controller, a direct fit, and either Turbosmart recirculating Kompact BOV (they have a model that screws as a direct replacement) or the Full-Race aluminum cover over the EFR BOV.
There is a guy running a compound turbo S2000 with two EFRs. Videos on YouTube and I believe a thread here.
Sound Performance has a Quick Spool Valve (not cheap) that fits between a twin scroll T4 turbine housing and a non-divided T4 manifold. It has a flapper that directs the flow to one scroll. 4 years ago BW displayed an EFR turbine housing that had a similar flapper built into the housing so it could use a divided T4 manifold, but it apparently never made production.
Then, of course, there is anti-lag. BW has a speed sensor for the EFR and an EGT sensor may also be helpful to avoid excessive turbine spool or temps.
Full Race discontinued IWG kits for the s2000, too many fitment issues and not a lot of people ordered it. I personally went with a custom made IWG manifold.
Thread Starter
Joined: Jun 2018
Posts: 813
Likes: 66
Never heard of iwg fitment issues. I did see alot of posts of basically everyone agreeing that the iwg forward facing designs really restrict ball bearing turbos. F22 and f20c engines are high efficiency engines that hate backpressure. I feel in the end that is why fullrave discontinued iwg kits for s2k and now only offer external wastegate. As for fitment issues the kit fits excellent. I just cut up near the passenger side headlight because i wanted to stuff a huge 6" filter and bellmouth had i gone with a 4" filter it would fit like a glove..
Joined: Mar 2013
Posts: 316
Likes: 6
Never heard of iwg fitment issues. I did see alot of posts of basically everyone agreeing that the iwg forward facing designs really restrict ball bearing turbos. F22 and f20c engines are high efficiency engines that hate backpressure. I feel in the end that is why fullrave discontinued iwg kits for s2k and now only offer external wastegate. As for fitment issues the kit fits excellent. I just cut up near the passenger side headlight because i wanted to stuff a huge 6" filter and bellmouth had i gone with a 4" filter it would fit like a glove..
their design of the Downpipe is what created the backpressure. There's a few custom kits out there without the back pressure issue, such as my own.
the fitment issue was with other aftermarket parts. For example, you couldnt run a TurboSmart WG actuator with their kit, and IMO, it is a must have mod. The stock WG actuator uses preload to adjust boost and causes poor WG flow from restricting valve movement (also creating back pressure). TurboSmart uses interchangeable springs and allows full WG valve swing.
Joined: Apr 2010
Posts: 1,095
Likes: 35
Nice build! Love to see full race stuff. To the OP, have you taken into consideration the amount of heat that manifold is going to put off? I also saw you are not relocating the oil filter because it "fits", have you taken into consideration how bad the downpipe is going to heat up the filter / possibly your oil supply by leaving the oil filter in the stock location?
Do you have any cooling system upgrades? or is it primarily a street driven car? Keep up the good work!
Do you have any cooling system upgrades? or is it primarily a street driven car? Keep up the good work!
Thread Starter
Joined: Jun 2018
Posts: 813
Likes: 66
Nice build! Love to see full race stuff. To the OP, have you taken into consideration the amount of heat that manifold is going to put off? I also saw you are not relocating the oil filter because it "fits", have you taken into consideration how bad the downpipe is going to heat up the filter / possibly your oil supply by leaving the oil filter in the stock location?
Do you have any cooling system upgrades? or is it primarily a street driven car? Keep up the good work!
Do you have any cooling system upgrades? or is it primarily a street driven car? Keep up the good work!
Thread Starter
Joined: Jun 2018
Posts: 813
Likes: 66
their design of the Downpipe is what created the backpressure. There's a few custom kits out there without the back pressure issue, such as my own.
the fitment issue was with other aftermarket parts. For example, you couldnt run a TurboSmart WG actuator with their kit, and IMO, it is a must have mod. The stock WG actuator uses preload to adjust boost and causes poor WG flow from restricting valve movement (also creating back pressure). TurboSmart uses interchangeable springs and allows full WG valve swing.
the fitment issue was with other aftermarket parts. For example, you couldnt run a TurboSmart WG actuator with their kit, and IMO, it is a must have mod. The stock WG actuator uses preload to adjust boost and causes poor WG flow from restricting valve movement (also creating back pressure). TurboSmart uses interchangeable springs and allows full WG valve swing.
I see yes that downpipe makes a sharp and adds tons of heat the way its routed. Also the air filter is not in the ideal location and i can see how adding a bigger internal wastegate would be a pain
Joined: Apr 2003
Posts: 2,885
Likes: 66
From: Cary, NC
That is my set up, and honestly the overall fitment is great with the kit. I do have a turbosmart wastegate as well wedged in there. Also so far no real heat issues with the way I have everything sleeved. This setup doesn't make the most power but its perfect for the street with a wide tq band.