I've pretty much settled on the EFR series of turbos. However, I cannot decide which turbo and IWG/EWG.

Im stuck between the 7670 and the 8374. I plan on running this turbo on a stock longblock until I can afford to build the block in a few years. I should add I do DD my evo.

1) Most build threads ive seen have included cams, how would this impact spool on either of these turbos?

2) How bad is the lag on the 8374 compared to the 7670?

3) Can someone please explain to me the benefits/drawbacks of and IWG? Is an EWG significantly better? Worth the extra coin?

I see the new CBRD 7163 kit, however I feel that it will eventually fall short of my goals once I build the motor. Maybe im wrong.

Thanks in advance guys.

 

To me, the 7670 is currently the 'odd child' in the EFR family. The 7163 does a large number of things better than the 7670 while giving up little (to no, depending on your setup) power.

The 8374 is a great turbo but will undoubtedly feel much laggier than a 7163, but you have the ability to make way more power. It all depends on what you ultimately want with the car, but I think your choice should be 7163 or 8374.

 

Buy a turbo that works for your current goals. When your goal goes up in the future, upgrade the turbo. Other wise you have a turbo too big for your app, is laggy, but doesn't have the pay off on the top end to make up for the lag. The 7163 should be able to get you to the safe limit of the stock short block.


What is your current goal with the stock motor?

 

Thanks for your insight dudes.

I'd like to make over 500whp (dynojet) on e85. I've seriously considered the stock location GTX3576r since I know its capable of my goals but It seems there are always issues with surge or oil blow by even with the upgraded banjo bolt.

 

It sounds like the 7163 would be perfect for you then. It will be considerably better than a stock location 3576 as well.

 

i agree with not going bigger now to make more power later. a laggy car is NO fun, especially when you're not realizing the power up top. then you just have a not-quite-fun spool up with a not-quite-fun peak power number.
also, i'm noticing a lot of people are finding they like the smaller turbos... so you may even find you are happy with the smaller one.
lots of reasons to start smaller. good luck, man!

 

If you're only looking for 500whp on E85, consider the GTX3071R. The GTX3576R is a 600whp turbo. The next question becomes if you want better spool or more power as you can get the turbine housing in 0.73 A/R and 0.94 A/R sizes.

 

This. Unless you're doing roll racing pulls or drag racing only, a small punchy turbo is way more fun for everything. Especially on the stock motor which has limited output anyways.

 

Get the 7163, it'll be way more fun on the street.

 

7163 should definitely be your turbo. It will meet your goals, with nice response.

 

Depending on your budget the agp s256 or 5858 t3 will get you where you want and save a couple grand over the other kits that extra can be used for cams/clutch etc. I'll probably get flamed but my build thread is in the dyno section and put down 504 on 92 on English racing dyno jet. Ben does have the new bw turbo as well. Food for thought when looking at all options.

 

that's my exact situation. I'm looking at no more than 450whp at this moment. I have no plans for the future, and obviously would like to build the motor but not even thinking about that right now.
I keep hearing about the agp t3 5858 as a great budget t3 kit from an alternative to a stock frame and being able to produce slightly more power than a stock gtx3071r or 18k for about the same price with the ability to upgrade turbo's in the future.
Although as you said, everyone keeps flaming people on AGP as if its garbage, and you should never run it, but its literally $2500 cheaper than any other kit and still producing a ton of power. What are the downsides to it other than lower output per from other companies t3 kit?

 

I'll add another unpopular opinion:

Keep the engine stock and operate within it's its limits.
Yes, some people are successful with built motors, but I haven't seen any go 100k+ miles. Everyone I know that had built motors has had issues. The built engine has to be blueprinted and built correctly. Don't forget all the supporting mods. Oh...And the reliability mods. Then all the drivetrain parts. And then, and then....
I've been down that road and spent more time fixing, checking, working out bugs, etc then driving. It was miserable. And I'm not the only one. Built motors are a lot more work. Just something to keep in mind.

 

makes sense and really my thought in the back of my head unless I ran into a buttload of money where having an extra car becomes feasible. So by that you're suggesting a simple stock frame turbo and staying below 500whp and just having fun?

 

Our cars are a ton of fun without getting power crazed. Keep the torque below the amount that windows blocks, and sky's the limit on power.
That will also help your other parts live a bit longer LOL.
500whp will require a fuel system upgrade though.