Wayne Presley/VeryCoolParts Build Thread H6 power

[Scargo]

Exactly. Pre-turbo on a turbo car this is very true still. You want to maximize pressure and flow rate going to the turbo...
... get the largest free-flowing exhaust post-turbo you can. Note that the stock header and up-pipe diameter is quite small compared to just about any aftermarket piece. It performs better because Iron works better for heat management for turbo applications and the smaller diameter piping has a better graduation in size than most aftermarket pieces to minimize pre-turbo turbulence. If you want to increase exhaust flow, start with a bigger turbine housing vis-a-vis a bigger turbo. Then you can upsize your header and up-pipe, you don't want the exhaust getting 'pinched' as it enters the turbo but you also don't want the exhaust flow to decompress as it enters the turbo either.
Post turbo, go as big as you can with the least number of bends....

What BrandonDrums said...^^ I wished this were moved to a separate thread as has been suggested. I have ulterior motives.
I was just reading on this subject for quite a while today and my gleaned info mirrors this pretty well. I have several Full Race manifolds and the ID is not as big as some others, yet the SS wall thickness is impressive (I think Schedule 10). The smaller ID maintains the velocity, AFAIAC and helps with low RPM torque/faster spool. If the exhaust is unrestricted, as in a race car, then so much the better (for the top end).
After the turbo, you want no restrictions; hence some have a foot or less of pipe after the turbo.

[Wayne Presley]

The equal length headers do change the sound and like any part on the motor there are compromises in one aspect or another. Big volume headers/pre turbo slows spool up but overall will allow a higher peak HP. Now if your turbo runs out of airflow before the peak flow of the exhaust, then you have given up spool up for no benefit. You really need to worry more about getting the turbo size right than look for something different in headers than stock at 325 RWHP or lower.

[Frank818]

Hey Wayne, you already back from vacations?
Can we start buying 818 stuff from VCP?

[Wayne Presley]

Ha, vacation what's that? Worked last Saturday, Sunday, Monday and half of Tuesday. 9 hours yesterday...And I don't see another day off until Jan 14th.

[Frank818]

Ugh, sorry about that.
Well I would want to give you some money for your hard work (in exchange for parts of course ), so how do we order 818 parts from your website?

[Frank818]

Wayne, starting when can we place an order for 818 parts?

[Canadian818]

He doesn't seem to want your money Frank,

[Frank818]

Nope. And I wanted to pay him in USD.

[Xusia]

^That's good. It's hard to spend Canuck Bucks down here! LOL

[longislandwrx]

I'm sure if you call him on the phone he will take your money.

[Wayne Presley]

Just call 760-403-6266 to order the parts.

[Frank818]

Tnx.

[DruOdil]

The 6 speed thread is going again and I was wondering if you plan on doing your magic on the 6 speed like you did on the 5 speed? I will buy it.
Dru

[Wayne Presley]

The six speed is going to be supported soon. I don't have one in my hands currently to make the shifter cable brackets.

[Flamshackle]

Ok wayne, I'm dying to see a video of your car? Where is a vid for us to see?

[Plebeian]

He probably wants to dyno tune it 1st before any video action shots.

[Wayne Presley]

Ok wayne, I'm dying to see a video of your car? Where is a vid for us to see?

He probably wants to dyno tune it 1st before any video action shots.

I'll take it out for a quick spin/video this afternoon but I wish I had time to work on it. It still has not seen the dyno with the H6 in it :-(

[Canadian818]

Couple of H6 questions for you wayne.

Do you think an oem imprezza rad is enough for cooling? I expect 20min track sessions max, at least for now.

Can the TEC-GT run throttle by wire? I know you offer other ECU's like AEM, would you be able to offer any of them with a base tune and etune with datalogs?

Oh, and where's that video? Feels like I've been waiting months to hear it...

[Wayne Presley]

[Canadian818]

Sounds good, even with wind and rock noise. Looking forward to hearing a drive by and the dyno run.

[Wayne Presley]

I love the sound of the 6 cylinder...

[Erik W. Treves]

Sounds great

[1Jarhead2]

Wayne that does sound really good.

[Flamshackle]

Made my day! Hahaha... Cheers Wayne :-) can't wait to see it all tuned and running a drive by... LOVE IT

[longislandwrx]

vroooooooom . who needs a stereo with a motor like that?

[skullandbones]

That's a wicked sounding machine, Wayne. Hope you take it to a track and do a video of that!

Thanks,

WEK.

[Wayne Presley]

I might even get to work on it in a couple of weeks :-)

[Wayne Presley]

Wow, I just noticed over 100,000 views on this thread thanks guys, and the few women who clicked...

[longislandwrx]

87,000 were Frank818

[D2W]

87,000 were Frank818

That made me laugh cause its probably true

[Erik W. Treves]

87,000 were Frank818

nope only 76 posts out of 909 total...but that;s 76 trips to the top and just a tick over 8% of total posts (on this thread)...and yes I counted...lol...

[Frank818]

That made me laugh cause its probably true

Nah it isn't.

Now 77, Erik.

[Canadian818]

Wow, I just noticed over 100,000 views on this thread thanks guys, and the few women who clicked...

The last 20,000 were people checking to see if the latest post was a dyno video.

Not sure if you missed my questions above, perhaps it's time I give you a call so I can plan my engine stuff.

[Tdelta1]

Great build Wayne and your 818 is a benchmark! I would like to know what type of wiring system that you laid out before splicing in the factory components?

[Wayne Presley]

Couple of H6 questions for you wayne.

Do you think an oem imprezza rad is enough for cooling? I expect 20min track sessions max, at least for now.

Can the TEC-GT run throttle by wire? I know you offer other ECU's like AEM, would you be able to offer any of them with a base tune and etune with datalogs?

Oh, and where's that video? Feels like I've been waiting months to hear it...

Yes the Impreza radiator is plenty big.
The TEC-GT does not run drive by wire. I can set up the harness with AEM or your choice of ECU.

It's a little chilly here this morning after last nights ice storm

[Canadian818]

So no drive by video today

Thanks for the info, I'll hold off on an aluminum rad and installing my throttle peddle. I'll also look into some of the ecu's you've mentioned, see which is the most newbie friendly.

[Wayne Presley]

Boy the weather has sucked here lately, had 3 days of sun this month, Spring can't come soon enough, I want to drive this thing!

[adubbelde]

Waa Waa, we've had 44 days with temps falling below zero, some as much as 23 below. Today is the first day in ages where we might go above freezing

[bompus]

High today is 82, low is 50.. paradise

[nkw8181]

This winter has sucked overall I think for everyone (well not the people from Florida but they get hurricanes). Here in Dallas we have had a lot of flip flopping. 20 no 70 now repeat. It was I think 26 this morning but gonna be in the 60s and sunny (if you trust the weatherman). I would almost perfer it to pick a temp and stay there so people stop getting sick. But yes I can't wait for spring because then I start building :-)