Hey guys. About to have my car back after getting new motor.

I am heavily considering upgrading from my 6466 to a 6870. I am having trouble figuring out which frame/inlet/a.r to go with.

Info on car/motor
2.0 Longrod
gs3 s3 cams
stock ecu

goal for the car is to make a healthy 850-900 (dynojet) and run 9.50s in the 1/4.

My tuner is heavily recommending the newer th4v t4 v band inlet but I believe they are meant to be setup for a hood or bumper exit exhaust. I want to keep my current 3.5” rear bumper exhaust setup.

if it matters - the hot parts I will be going with is the Morrison fabrications large runner kit.

Definitely appreciate any input

 

You should 10000000% do T4 twinscroll. It will spool faster and make more power up to compared to vband due to higher efficiency, as well as have better transient response. A 1.15 hot side should be fine unless you're revving it to 10k, but IIRC you have a stock oil pump so you should be keeping it under 9500 anyways.

I'm pretty sure the ETS forward facing kit fits the H cover. And I know for sure. their standard placement kit fits the smaller S compressor cover.

Or I'm sure Morrison can get you setup as well. Either way, you should do twinscroll.

 

+2 for a twin scroll T4 turbine. That'd give you the quickest spooling setup.

 

Slightly off topic but with a number of cars in the mid 9's with a 6466 what about putting that money towards an ECU , a magnus launch control device,4.31 final drive and an evo 9 tall first gear. ? Get the car to leave consistently and be easier on parts may save you money vs throwing more power at it.

The stock ecu is good to a point, but if something goes wrong it makes for a sad day.

 

I just had the transmission done with all the gear upgrades. Liberty face plated 1st and 2nd gear. I opted to stick with the oem final drive. I read you typically don’t need that until you are trapping over 160mph. But I do have the longer evo 8 3rd and 4th gear.

id like to stick with the stock ecu

 

I'm just looking at it from a "whats the fastest people doing today" point of view and what path I would take. You also don't know how far down the rabbit hole you will end up. You will get an ecu at some point. If a vacuum line comes off the fpr, or a pump goes away the stock ecu can't keep you out of trouble and an engine is hurt. There is ALOT of things a proper standalone can do.

The evo was built for the rally course not the drag strip. They can make plenty of power but the gearing is pretty short and without any changes the launch becomes a hopping/breaking/pulling the trans apart situation. STM went 8.2 back in 2014ish and it took years and a different approach to go 7's. Making power is easy, getting it down and not blowing the driveline becomes more of a challenge. If the trans or tcase breaks a few times due to hopping and loading/unloading the drivetrain it will be expensive.

If you look at whats taken place with ER going 7's with the CT9A platform and the X being close you can see how well they launch vs typical evo's in that class. They are using an acd tcase with standalone with different lockup values , a clutch valve , a tall first gear, and a taller then stock final drive. Launching a car smoother is easier on the driveline,suspension,tires and parts. Let the clutches do the work.

I know your goal isn't 7's but keeping the driveline and engine alive would be one of my goals.

 

If you're on a stock ECU, that should be the first move to upgrade vs a new turbo kit at this point. With proper head porting and intake manifold (magnus V5), your car should make ~850whp as it sits with the 6466.

 

Thanks for the feedback guys.

I ended up going twinscroll t4. 8 weeks roughly until it’s finished but I look forward to displaying their amazing quality.

I for now am going to stick with the stock ecu. I understand all the failsafe features on the standalones. But I would like to push the note on the stock ecu. While may be risky I trust my tuner and engine builder. Even with failsafes nothing is bulletproof if a part fails. That’s just part of the “game”.

 

What sucks about the stock ECU is mostly how well it runs the engine over 800whp. At that power level the engine revs faster than the ECU can think. You see it in the datalogging... where you get a data point ever 500-750rpm. And that translates into seeing the choppiness in the curve if you turn the smoothing down in the dyno. It's just fairly less than ideal, even though lots of guys do it and it works.

Good choice on going T4 divided. The 1.15 A/R exhaust housing will be what you want.

 

[QUOTE=letsgetthisdone;Good choice on going T4 divided. The 1.15 A/R exhaust housing will be what you want.[/QUOTE]


i have this.
no regrets.