Autodreams gtr rb34 build thread

[gtrjon]

couldn't have said it better myself marvin. i have personally dealt with marvin and autodream so +1 for their work, their shop, and the cars they build all top notch.

[Armanio]

Wouldn't chopping the end of the plenum like that ruin its flow characteristics? Assuming it's flow matched etc. Car looks nice.

[Chopsticks]

Wouldn't chopping the end of the plenum like that ruin its flow characteristics? Assuming it's flow matched etc. Car looks nice.

When we decided to cut the plenum to fit the stock CMC, we were a bit apprehensive on doing it. However, we were not even close to the 6th cylinder velocity stack when we cut the plenum. There is still lots of air volume to flow in. If however, it did affect the HP numbers, we were still happy with the hp numbers we pulled. For this daily driver, we know we overbuilt it for the street and maxing out the capabilities of this build could potentially get us well over 1000hp (with the right circumstances of course) But we want to set an example to our customers that if you invest all your hard earned money into your project car, sometimes stretching it to the limits would be more costly in the long run. (we want to push it, but not to the VERY extreme)

As far as 2014, we are going to retune and try to see what we get, since we corrected the boost falling issue. We also are trying to convince Nguyen to buy the tomei expreme ti exhaust (though he had full titanium straight pipe on it before and hated how loud it was)
This should help a bit with flow.

So keep checking back for the retune numbers.
But again, we were happy with making 852whp at our elevation (3500ft above sea level)
Our dyno is a dynomite dyanometer if that matters to anyone.

[Armanio]

When we decided to cut the plenum to fit the stock CMC, we were a bit apprehensive on doing it. However, we were not even close to the 6th cylinder velocity stack when we cut the plenum. There is still lots of air volume to flow in. If however, it did affect the HP numbers, we were still happy with the hp numbers we pulled. For this daily driver, we know we overbuilt it for the street and maxing out the capabilities of this build could potentially get us well over 1000hp (with the right circumstances of course) But we want to set an example to our customers that if you invest all your hard earned money into your project car, sometimes stretching it to the limits would be more costly in the long run. (we want to push it, but not to the VERY extreme)

As far as 2014, we are going to retune and try to see what we get, since we corrected the boost falling issue. We also are trying to convince Nguyen to buy the tomei expreme ti exhaust (though he had full titanium straight pipe on it before and hated how loud it was)
This should help a bit with flow.

So keep checking back for the retune numbers.
But again, we were happy with making 852whp at our elevation (3500ft above sea level)
Our dyno is a dynomite dyanometer if that matters to anyone.

I'm not concerned about HP numbers, I'm concerned about the fact that the flow matched plenum designed to eliminate the leaning issue on cyl. 6 is now a cut and paste job with unknown flow. Just seems really silly, relocate MC vs. ruining plenum and potentially making the engine short lived especially given how much power you're running. It's your guys' money and build though. Everything else looks nice, stock driveshaft and cv's?


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[Skym]

Can run a pedal box, resouvoirs, etc.

[autodreamMarvin]

Wouldn't chopping the end of the plenum like that ruin its flow characteristics? Assuming it's flow matched etc. Car looks nice.

Yes it would, and this would not be something I would recommend to a customer; as manifolds are designed, engineered, and flow-tested for it's plenum shape and volume.

This was done due to time limitations. A Wilwood pedal box with inboard master cylinders would have accommodated for this, but the deed has been done.

That said, there hasn't been any indications that the plenum is not providing equal distribution of airflow to each cylinder; as there had been no evidence from:
-plug readings
-compression tests
-physical indicators upon tear-down

We will be testing this further by utilizing multi-channel wideband as the Link ECU is capable of individual cylinder correction.

But likely we will be upgrading to a RIPS or Hypertune, as the supplier of the plenum currently on the GTR we will no longer be carrying.

[autodreamMarvin]

I'm not concerned about HP numbers, I'm concerned about the fact that the flow matched plenum designed to eliminate the leaning issue on cyl. 6 is now a cut and paste job with unknown flow. Just seems really silly, relocate MC vs. ruining plenum and potentially making the engine short lived especially given how much power you're running. It's your guys' money and build though. Everything else looks nice, stock driveshaft and cv's?


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Sorry, I didn't read your next response before answering earlier.

For now stock driveshaft's and CV's until they blow.

This is our test bed to determine the limitations of the components so this knowledge can be passed down to our customers. (CV's, dshaft, etc)

Can run a pedal box, resouvoirs, etc.

Yes we could have. The decision was to modify the plenum as running a pedal box would have greatly pushed back the time-frame for the completion of the GTR.

The part would have needed to be ordered directly from Wilwood, and extra time would have been spent to mount, fabricate etc.

The vehicle was taking up shop space which could be used for our customers, so the decision was made to modify the plenum.

[autodreamMarvin]

Sorry, I am not regularly on GTRC as I work as an accountant during the week and as a father at night.

I generally respond on Saturdays when I am working at Autodream, or on rare occasions when the kids are in bed before 9pm.

[LuckyGTR]

from a good sourse in japan that been dragging for MANY years ,

STOCK front axel will let go at 700-750 torque , not HP

REar axel are good till 850 torque

2 piece driveshaft is a POS and will brake wit hard launch at 700 torque


if u wanted to know marvinautodream

[Dragon Humper]

Thats why most guys in Japan stayed with the stock displacement and spun them to 10k. They kept the torque in check and made big HP with revs. IIRC the JUN Super Lemon and the HKS Vmax car both ran stock gears, housings and axels (with off the shelf after-market diffs) for a very long time before they upgraded....not untill the mid 8s.



Jon.

[GoldNinja]

Great work!

[turdzoplenty]

What let go that you had to tear it down?

[kyledude351]

man I wish i could do that with my gtr lol. Its in the shop right now at autodream

[Chopsticks]

from a good sourse in japan that been dragging for MANY years ,

STOCK front axel will let go at 700-750 torque , not HP

REar axel are good till 850 torque

2 piece driveshaft is a POS and will brake wit hard launch at 700 torque


if u wanted to know marvinautodream

Yeah you're very right about that. Right now were only at 600ft-lbs and rarely launch it. I think if we run in to problems with the axles we'll get driveshaft shop 1000hp axles if it's in our best interests.

What let go that you had to tear it down?

Last year at the track we spun a bearing on our last run. All the oil moved to the back of the pan and the sump was dry. Not to mention we we're down a quart of oil and the car beside us jumped the line and had to reverse while we we're bouncing off the launch control for so long. The cards we're not in our favor and we were not prepared.

[Chopsticks]

Sorry for the Iphone photos but here's the progress.







Fabrication of lower oil canister










Web of stainless lines





Tight fitment




Starting to clean up engine bay.