Fast Intentions Stage 2 TT build by MA-Motorsports.

Rusty

Hmmmm. Interesting thought process. I can see where you're going with this.

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浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
http://www.the370z.com/members-370z-...o-journal.html

Spooler

I'll drop the bomb later. I may wait until my build is done. It is not what you think...

jchammond

LMK when you make the trip; unsure if you’re going solo,,,or the old lady is riding w/you...I’d like to meet up with you somewhere & be a co-pilot
(That’s if I can get off work & pending your stay time).

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MazWorx built long block | FI-TT-100 Stage 2.75 | IPT built 7A/T

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URBiN~HURMiT

Built motors = all new ball game
Good info on the research and conclusions

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- -Z&I ~~~~

Spooler

My thoughts on cam selection.
Everyone knows we have a limited selection of cams and then it is only for the exhaust side. They are not known to make great power levels on a NA car but for a boosted car you would use them for a different reason. To move the power under the curve around to be more suitable for your turbo selection. If you have larger turbo's you would want a cam selection that would move the torque more down in the lower rpm levels to help spool the turbo's and then to keep air moving up top and not fall off. Looking at the dyno graphs for the
JWT C1 cams we can see that it really moves the torque curve more down low. This would be an excellent choice for a turbo car with large turbo's (GT35's or larger). It would help to spool the turbo's quicker and reduce lag. I have selected the JWT C2 because my turbo's are in the middle. The biggest reason for me using these cams was stated in the thread about them. He stated that he doesn't have to downshift to pass a car. This to me was an eye opener. The one thing I can't stand about the power deliver of my car is it is flat between 2500 to 4000 rpm. If these cams can improved that area of the rpm range, I am all in. That is why I have selected these cams. So, on my dyno graphs I will be looking for a response between the 2500 and 4000 rpm area. Not sure how well they are going to work but we shall see. It's cheap to put them in when you are building an engine.

So what do you gain with exhaust cams? You gain drivability.

Spooler

Here is a guy making 10psi of boost at 3500 rpm with AAM stage 1, 10:1 compression, and JWT C1 cams.

URBiN~HURMiT

The N/A stock motors do go flat between 2500 and 4000 rpm ... You can definitely tune that out when you go boosted.

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- -Z&I ~~~~

Spooler

I think the JWT C2 cams are better for us. My understanding the guy had FI 3.5 turbo's. I would have used the JWT C1 cams on that engine. You can see the torque curve in the video. It's flat and comes on hard down low. Too much for my liking. He will struggle with traction down low for sure. Looking at your graphs the 3.357 is the reason your dyno graphs read low. Doesn't matter if the car is not in the correct rpm range for the quarter mile. The less shifting is also better for 1/4 mile. A 3.5 diff would be better for you I beat. MA can fix that up for you also with a quick change diff and custom subframe. LOL

URBiN~HURMiT

This build is all new territory for me and I've been making decisions these past 5 years based on research and the technology available at the time.
Tried my best, but it's still an educated guess tho'.

I did consider the 3.5 FD (from the 350z) but it was too close to the 3.692 OEM gears in the car... so I went with the 3.357.
As it was - the OEM 3.692 gears were just about useless launching the car.

I did check out that video you posted earlier - looks like Dynosty did a great job on the build and tune.
One of the things I look back on and regret a little is not going with the 10:1CR.
I had 9.5:1 in the IPP built motor that AAM managed to grenade.
Daelen talked me into going back to the OEM 11:1 CR for their build.
Right now I'm going to live with what I have - been way too long as it is.

The DynoLog Sheet does show a hump in the Torque curve at 4300 rpm, and flat spot in the neighborhood of 5000 rpm.
Will have to see how that works out in real life.
I'm sure/hopng it can be corrected if needed.

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- -Z&I ~~~~

tonyHTX

From my understanding the bigger the overlap the higher the back pressure, which should cause spool to be sooner.

I would put the more aggressive cams on the bigger turbo setup - meaning I would use the C2 Cams with the 3.5 Turbos.

Small turbine = less overlap. Large turbine = more overlap.

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2007 G37S [VQ37HR] Sedan 6MT - Fast Intentions Stage 3 TT - @ttv36 #tptoons

Spooler

It all depends on where you want to move the power under the curve.

tonyHTX

True, the Z has a shorter wheel base so I can see why you're saying you'd want the spool to move.

Did you ever mention which Xonas you ended up getting?

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2007 G37S [VQ37HR] Sedan 6MT - Fast Intentions Stage 3 TT - @ttv36 #tptoons

Spooler

They are the FI 2.5's. They are a GT30 frame turbo. I don't remember the Xona numbers off the top of my head. They are a custom Xona turbo.

Spooler

The machine shop is working on my engine now. They were honing the cylinders Tuesday last week. Hopefully it will be done by the end of the month. I don't want to travel up that way until after New Years anyway. Way too many people on the road. I will do it if they call and want the car.

Spooler

My worry is the weather. MA likes to drive test them on the road to double check the tune, etc. This will be a challenge in the dead of winter. Finding good days to do so will be tough.