So I am contemplating getting an EFR 7670 with the 0.92 A/R housing and internal wastegate. I also want the spool up to be fast and don't care much about big dyno numbers. I know the internal wastegate and turbine size will be a limiting factor when it comes to higher airflow rates and 350+ HP.

I had been wondering if the compressor housing on the 7670 was small enough that you could use the internal gate T4 on the T4 HKS Cast external WG manifold.

That manifold is known to have boost creep problems and its quite likely the internal WG 7670 would have boost creep problems, but with both internal and external perhaps you could get away with a really big downpipe/exhaust and no creep as well as a cheap solution for a manifold.

 

I kinda wondered about doing both the internal and external wastegates, too. I'm really not sure if there will be enough room for the actuator for the internal wg though. I was thinking about picking up that HKS cast manifold to use as a jig to make more short runner manifolds. I love mine and I figure that would be a good one to model. I want to make sure it will fit this turbo and the car together though.

 

So I am almost ready to pull the trigger on the EFR7670 0.92 A/R internally gated turbo. I live within the Denver area so I am subjected to emissions testing. Mine is due now so I am going to go ahead and do it but two years from now how am I going get this thing registered again. The airpump I would think has to go away to get the turbo to fit.

 

Register the car in el paso county.

 

I wish you all the best getting one. I have been on the waiting list for a 1.05 ext gate 7670 for about 10 months. (was quoted about 6 months) Still no idea when I will see it other than "maybe a couple of weeks away..." The 0.92 hotside might be easier to come by though.

But would check on availability before you get your heart set on one. I am pretty disappointed but am now looking to alternatives.

 

Who did you order from?

 

I have found that with my manifold which is almost exactly the same as yours it is easier to mount the turbo to the manifold before installing it in the car. Then install the wastegates after the manifold is bolted in place. If you have not tried that yet.


Good luck on the WG re-route. lol.

 

I installed mine this way as well.

 

I tried that but I can't get them in while they're bolted together.

Oh and I'm really not looking forward to rerouting the wastegates. Such a PITA LOL

 

Repost.

 

Today I stopped by Hanksville Hot Rods and see about what it would cost to get a custom manifold created (1500ish). Where did you get the 321 T4 flange and exhaust port flanges. They can also mandrel bend on site so he can make me a 3 in downpipe as well. If I have someone custom building me a downpipe I could go after a 1.02 divided housing and have the wastegate(s) plumped back into the downpipe. I know the rotary exhaust gas temp is really high. Do we have to use 321 SS or will 304 SS handle it? if I was going to get the downpipe made I could just go with the Full Race manifold which is 875.

 

Full Race

 

My flanges are 304, not 321. The exhaust flange I got from Racing Beat and I got the turbo flange from ATP turbo or something if I remember right. Most people use 304, so you don't HAVE to use 321, I just heard good things about it and the fabricator had some left over from other projects. My manifold and downpipe were $500, not including the money I spent on the flanges and other materials. So I got a GREAT deal on a great manifold.

 

This is great man, some good info in here! I'm going single soon and I think the EFR 7670 1.05 is the way to go. There is another thread where they are discussing the temperatures that the EFR can handle, guess you haven't had an issue! Are you using the built in BOV?

Thanks! Post up some footage of how it sounds/accelerates/goes!

 

Here is a video I took last year. It's just an acceleration video while getting on the highway, and the only things you can look at for reference is the weeds on the side of the on-ramp so it kinda sucks lol, but it is what it is.


I absolutely love this turbo. I think it's the perfect mix of spool like the stock twins and the top end of a single. My turbo starts spooling around 2k RPM and I haven't had it on the dyno yet but I should be around 400-450whp.

I've never had any problems with heat that I know of or noticed. Yes, I'm using the built-in BOV, but I'm not using the boost solenoid or whatever it is because I already had an EBC hooked up. And I am using dual 38mm Tial wastegates, one on each runner on a short-runner manifold.

 

Amazing, thanks for the update! You need to get this thing on a dyno ASAP!

 

 

great to hear your initial impressions, also that you drove it across the country. If you dont mind my asking - what fuel are you using and how much boost are you targetting currently

sorry to hear this. If you were waiting from us (Full-Race) we contacted everyone that was on our reservation lists a few months ago, all the efr 1.05 a/r variations are in stock finally arriving with consistency. sorry if it took too long, you aren't alone in your frustrations of waiting on borgwarner

 

No problem! Yeah I know, there are just a few things I wanna nail down first, like finishing install of my Adaptronic Select, logging AFR and EGTs (need to move the EGT sensors further back on the manifold, they're too close to the engine right now), and possibly stepping up to AEM coils and eventually flex fuel I think. I will skip flex fuel for now and get on the dyno, but I'd like to have the AEM coils first.

My engine bay has changed A LOT even since that pic lol. I'm just using pump gas right now, and pushing about 24psi. Yes, I know, I'm playing with fire pushing that much on pump gas LOL. I have water injection as a safety net and it seems to have saved me so far, but I'm thinking about turning down the boost also.

I've also thought about buying a spare EFR just in case something happens to this one, that way I won't be without adrenaline lol.

 

its pretty shocking how poor quality most pump fuel is, especially on the west coast usa... Once you switch to race gas or e85 it gains sooo much especially in the midrange! i know turning the boost down is no fun, but realistically if you are running 24psi on the 7670 youre probably getting close to (or in) turbocharger overspeed. you may want to at least taper the boost in the upper rpm's to 21-22psi just to play it safe

if youre going to get another efr, try the 8374!! ... although i dont know if it would fit your setup

 

I thought Raffi told me this turbo was good for about 30psi lol. Either way, it will be a while before I do flex fuel, if I even do it. So yeah, I think I'll get boost down a little lol. Thanks for the heads up!

When I was looking at this turbo, I thought the 83 series would be too big and not responsive enough, but as quick as this one spools, and as long as the 8374 would fit, I might look at doing that.

 

I bet the 8374 would be a beast. I wouldn't mind seeing and feeling one of these in a 13B.

 

Well, next deployment I'll get one and take you for a ride LOL.

 

Definitely, if you decide on getting one.

 

its great to run 30psi in the meat of the powerband, you can make absurd midrange TQ and HP but at the top end, higher RPM is where the boost needs to drop to prevent overspeed

excited to see what Ric Shaw does at WTAC, just 4 days away