No, I will use the same ones I am using now.

I will make these in about a week, and the OP should be able to get you some first hand feedback by the end of next week, since he is first in line and local to me.

I jacked my own thread a few pages ago, lol no worries. I am just surprised this hasn't been a larger issue before this started.

I will spend a bunch of time logging and retuning, I should also be able to give you the approximate K value change to dial these in. Ill keep track of all that and post it up when I have it.

Hey John. I bought a new block with 100 miles on it that was involved in an accident. It turned over great when I inspected it and it looked brand new. However, the crank pulley took a hard hit. Turned out it threw the crank snout out of round by 10 thousandths. So now I had two bad motors sitting in my garage. The one I blew was disassembled and the wrist pin jacked up the cylinder wall so now I am building the 100 mile block since I will have the crank out anyway. Plus I found a steal on some new components off the forum here.

Sasha,

Your level of customer service is so over the top its almost inappropriate! :icon17:

Can you imagine telling some other companies you maxed out your Mafs and need them to build you 3" pipes? They would hang up on you..Lol.

Dude that sucks.

But pumped for the outcome!...High Boost + E85 + BP Kit = WIN and an insane amount of fun :tup:

I know! But this whole being down thing is killing me. Especially since its such nice weather right now and winter is coming = Zero Traction

It's either that or the way we have it here. It's 95+deg with insane humidity. I only spool the turbo up when the sun isn't out :mad:

On the flip side I get to drive summer tires all year round, so definitely a give and take:tup:

Well the VPC just replaced the MAF all-together and didnt offer that option. Someone would have to design and build an all new electronic tuning product for that. At least, I have never heard of anything else like it already available.

Please you guys have it good. Move up here. lol its going to snow in a month. haha

Hell I know what that's like. I was raised in North Dakota and it felt like winter would never leave. In Denver we get maybe 10 winter storms a year and the snow is only on the ground for 3 or 4 days then melts each time. So I can still drive the Z around in winter at least.

Cant wait to see this. I wonder at what psi this will choke out the maf at.

Sasha, Could you make the pipes with the longer standoff if requested? I wouldn't mind a strip setting at 17lbs or so.

Chr#%t, don't remind me of that horrible white sh!t. Feels like summer just started...


http://i.qkme.me/3px3cg.jpg

3" pipes:

http://i137.photobucket.com/albums/q...ps3e0a8424.jpg

http://i137.photobucket.com/albums/q...ps9db579d6.jpg

oooo gimmie gimmie. lol. Ill have results next week. It will take some time to retune the car.

Sasha,

Do you have a few sets of these made up? I would like to get one soon. My motor is going to the machine shop today.

Ordering more pipes today so I can fabricate a few sets. I think it would be best if these become standard in the kit.

I totally agree. Man, I came into the game 6 months too early..lol.. There have been some amazing revisions to this kit, which was phenomenal when it was at Rev.0.

Got the 3" in and tuned. The only real benchmark I have was a 80-140km/hr speed run with the racelogic VBOX sport what is very accurate and used by car and driver to benchmark their cars. We started out with a 80-140 speed of 3.92 seconds. After the tuning we were down to around 3.60 seconds. The car is much faster now that I can safely run up top. I ran the timing into knock and backed off about 2 degrees to be on the safe side.

The downside to you guys looking for built block setups and want to run over 13PSI of boost I think different MAFs are still going to be required as now I am sitting ~4.75 volts IIRC. I think anything over 14PSI will peg the MAFs.

For what its worth my K value changed about 15% from what it was with the 2.75" boost tubes. So its fair to say that there was about a 15% increase in flow around the MAFs with the larger boost tubes.

:rock:

Dumb question #1. How did I push 11lbs of boost through just one of these on my 06 single intake 350?
Dumb question #2. Can we somehow use the 350 mafs?

Answer to question number 1: Its not boost your measuring its airflow. So that could be why.

#2 - You can use the GT MAFs that uprev sells if you need the extra room.

No dumb questions at all.

Thanks for posting the feedback Mitch. This is about what I calculated as far as flow increase.

This sure makes you wonder how some others get away with 2.5" charge pipes. :)

Anytime Sasha, shes much quicker and safer now.

Lower boost? and a ton of timing? That or everyone is pulling into their MAFs and no one really pays much attention to it and just changes their fuel comp tables to suit? I mean it works but man it doesn't leave much room for error. Maybe thats a contributing factor to many of these popped engines? Who knows its all speculation.

My gtm tt kit came with 3" tubes..

Correct, but there are kits out there that come with 2.5" tubes.

I used 2.75", which was sufficient for stock block power at the time of development. However, it seems like customers are starting to push more and more power, with higher boost levels. I have built a couple of sets of 3" pipes in the past for those that intend on building their engines...but for the most part the 2.75" tubes will do the job.

The V-2.0 will come with 3" pipes, and that should be more than enough to push the stock block to it's absolute limits. Upgraded MAF sensors are available with the kit too, for those that build these engines and want to run 15+psi of boost safely.

Why dont we just make 3.25" tubes? :stirthepot:

Good question, I would think increasing the piping to much just in one spot will change the flow profile of the tubes. Not to mention you slow the velocity of the air down as it hits the larger boost tube only to ram it as fast as you can back down to 2.75" and through the TBs. If you could find a way to get bigger throttle bodies (maybe off a titan? have no idea if nissan has larger TBs) then you might be onto something. lol.

I have never personally tried it, but I am under the impression that the loss of resolution at lower airflow can make it difficult to tune low-load areas of the map. Where that comes into play, I am not sure. But I think the 03 Cobra guys start with like a 3.5" MAF tube and upgrade to like 4-4.5" since they are pull-through.

I wonder if there could be an easy way to just sort of restrict how much air actually passes through the MAF sensor, rather than having to put it in a larger tube?

I dont think you would have that issue myself. At lower airflow the car is running in closed loop anyways so the MAF is not really watched at all anyways. All you would have to do if you were having issues at lower load is just pull the car out of closed loop later and let O2s deal with the resolution down low.

It was discussed a bit earlier in here that you can just move the maf closer to the wall of the tube and because you assume laminar flow through the pipe the velocity of the air moving near the wall will be less.

I think if you go to big you will cause turbulence in the piping since they are relatively short to begin with and you need that smooth flow to be able to accurately meter it.

Also on a side note your fuel kit is working awesome. It holds 65+ PSI all day under boost with no signs of slowing down. All this wouldn't be possible on the stock system.

these are the 3in charge pipes i made with the tall maf slots sorry there not powder coated yet and with testing last night and some today( on 24hr duty right now) there running 4.2 volts at 12 psi. i'm not running an exhaust right now.



http://i1291.photobucket.com/albums/...ps11izuwuz.jpg

http://i1291.photobucket.com/albums/...psdda46dwe.jpg

http://i1291.photobucket.com/albums/...psdds1iknw.jpg

Nice work! How tall are those standoffs?

So if the sidewall slows down the air.....what if you made that sidewall slow it down more. What about roughing it up?

when i get home i well check how tall the are...i know they put the opening of the maf at the very edge of the pipe

Very nice! That should give you more headroom than me.

well see i got to play with the tune some more...i and stop turning up the boost i started at 7 and started going up...but i hope this sloves the problem

here is a pic of the pull from my base tune on 10psi and you can see my MAF's don't get over 4.12 volts.....

http://i1291.photobucket.com/albums/...psrfftzggu.jpg

How tall are those standoffs again? And what were your volts at 10psi before the mod?

In tall and idk cuz this was my first configuration..I know one thing that helps is the shright part be4 the maf