vr engine bay pics...lets see 'em

[Flipdriver80]

A turbo drag car isn't a daily driver and doesn't have to contend with noise ordinances nor cabin drone and therefore not a suitable nor relevant reference.

i was using that example to make the point that the exhaust part that runs under the car however long it may be doesn't have much to do with turbo car performance unless its further restricting exhaust flow.

its different then a na setup which requires a certain amount of back pressure to make power.

[vr6pilot]

Okay.

But...while we're nuggin' out the details. An NA car doesn't require "back pressure" as you put it. Common misconception. So to help make vortexers smarter than the average bear...

...the true tuning element in an NA exhaust setup is exhaust flow and velocity where the engineering target is to keep the spent gasses moving outward rather than allowing them to slow, stop, or reverse direction even momentarily. Higher velocity exhaust movement is more resistant to such unwanted flow reversal and can even help pull the next burst of spent gases along. This is the design principal behind your typical header. On an NA engine, tuning the exhaust system usually means having a target rpm in mind where peak efficiency is desired. In small displacement engines, the target rpm range is usually higher where the engine needs to spin to make it's best power output but low-rpm power usually suffers. On large displacement engines, the torque band is so large that finding the sweet spot for exhaust tuning is much easier and tends to be biased lower in the rpm range. But anyway, exhaust gas velocity is higher with smaller diameter tubing. This works great in the lower rpm range where the gases are better scavenged by the collectors but as rpm rises and exhaust gas volume increases, the smaller diameter pipe becomes a restriction to flow and "top-end" performance suffers. Opening up the pipe to allow for better flow at high rpm reduces the velocity of the gases at lower rpm and can allow the unwanted stoppage or reversal of gas flow making it harder for the next exhaust pulse to exit the combustion chamber and certainly not helping it out. This can cause the car to run like poo in the rpm range where most of the 'daily' driving is done. This association between exhaust pipe size and engine behaviour leads many to think, in the simplest terms, that the engine is performing better due to the increase in back pressure.

Break for recess.

[DUBZAK]

you could have just told him to search for "scavenging effect"

And I run a 3" on N/A for the haters.

[vr6pilot]

He would have found nothing. Its "scavenging". I grow weary of this discussion. MOAR PICZ!!

[Boost112]

And I run a 3" on N/A for the haters.

...quick review? im interested....

[DUB-YAH]

I ran full 3" from the dowpipe back on my n/a motor went like a raped ape too

[95gtinewb]

A modest contribution...

[V-dubbulyuh]

Nice 'n clean.

[Doze13]

[vr6pilot]

Sad I gotta jack someone else's pics to keep this thread going... this one's amost stock:

[vr6pilot]

here's another I just happened upon...

[Soundwave_vr6]

[DUBZAK]

[.:13]

Is this pic from Motorstadt 7???

[Soundwave_vr6]

yup i came over from Ontario

[IdontOwnAVW]

My engine bay as it sits right now, no idea why I left the plug wires in there. They're out now though so its all good haha.



Theres been progress since then but its been minor...wiring harness is out of the way and all I need to do is undo the axles and downpipe from the cat and out she goes.

[VixenUNBREAKABLE]

This thread.

Here's my turd... Battery relocation soon.

[quadcammer32]

35R, schimmel, tail 4" inch exhaust. it does the job



in this

[V-dubbulyuh]

Real nice. How much boost your running? What is the spool like with the 4"?

[vr6pilot]

Interesting one...

[vr6pilot]

[vr6pilot]

[vr6pilot]

You can tell where I've been trollin'....

[Scotty_2.0]

I know it's a little lacking right now, but just for kicks...... (check my sig for progress)

[vr6pilot]

Well, the OP wanted engine bay pics...didn't say nuthin about it having to have the engine innit.

This is one sweet Mk3 under the bonnet! >>

[V-dubbulyuh]

You can tell where I've been trollin'....

Interesting, have not seen the MSD's relocated to the pass side before.

[quadcammer32]

Real nice. How much boost your running? What is the spool like with the 4"?

im only runnin 15lbs now. the car pulls HARD. it spools fine

[boraspecvr6]

[vr6pilot]

more today...

[vr6pilot]

[vr6pilot]

moar...

[vr6pilot]

[vr6pilot]

[vr6pilot]

Tidy...

[.:13]

bumpage