Plenum Theorum

[Guest newl]

Keep up the good work Ben.

[IH8TOADS]

can you use the extra rpm to stay in 4th or is that simply out of the question?

for a low down power man you starting to work outside your norm.... lots of experimenting to come!!! looking fwd to seeing ya work of art.

[F6 UTE]

can you use the extra rpm to stay in 4th or is that simply out of the question?

for a low down power man you starting to work outside your norm.... lots of experimenting to come!!!  looking fwd to seeing ya work of art.

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No, I don't use the higher rpm's at all. BUT when I run 4th gear, with the power I have, it needs to be making power up there to maintain my car speed.

The 1/4 mile run can be looked at in the dyno graph. I use 4000-5000 rpm to half track ie 1st, 2nd, 3rd then I hit 4th just before the half track markers.

I then have to, regardless of whether I like it or not, stay in 4th and rev the crapper out of it to ~6000rpm, to obtain ~119mph. Reflective of the power it makes..

This is what the wog was able to achieve. It could launch, with Power down low to get it moving, then power up top to sustain the car speed.. Albeit at a lower power level. 115mph I ran before was roughly 5600rpm, easy to achieve constant power at that level..

I now need to replicate that, at a higher power level, not easy.

I now have the breathing/top end sorted, but I have to get, as a minimum, the power I had down low, back.. If I can better it, then look out, coz it's gonna be a damn quick car

[RAP1D]

You might get away with adding more advance down low, your psi level would be lower, as you said, so it will take the extra timing... might take some decent dyno time though

[F6 UTE]

Well the plenum was sent off to the man with the Tig welder..

It will be back with me end of next week when it will get machined and the bolt holes threaded etc..

I'll do a temp fit and adapt new pipework to suit, I'll prolly use the Nizpro rubber under headlight piece..

If it all tests ok I'll send it off to get powder coated before hitting the track with it. In all reality with the silly season, it will be next year before I see results in the way of 1/4 mile numbers..

I'll hope to throw it on the dyno early Jan and see how it performs..

Looking forward to it now..

[Ralph Wiggum]

Good stuff Ben im looking forward to seeing the finished product and how it performs..

oh and one more thing...

Edited 07/12/06 04:27 AM by hiddeous

[F6 UTE]

Well I called in to see how the plenum was progressing and drop off a couple of bits of ally for Tig man.

Well, he's got it all tigg'd up except the throttle body plate

He's also going to mill the faces for me, so once I get it back it's just a matter of matching the plenum to the lower half and fitting my bits and pieces ( boost lines, sensors etc ) extending my throttle body wires then it's all go

He'll also dress it and radius the corners so all I have to do is get it coated, which is a damn shame, coz the welds are A1++ Some of the best tigging I've ever seen - perfect welds..

So I pick it up Thursday arvo.

I'll start a new thread with some happies when I have it....

[illusionzzz]

Thought I'd bring an old thread back to life...

Anyone know what plenum was being used on DRIF6?

That to me, seems like the best designed setup, besides the issue of the ABS etc

[SCRIBR]

wow what an indepth thread!

It really opens up alot of questions (obviously).. and makes me wish I remember some of my physics from year 11-12!

can't believe I read it all!! ... but I can see why some people don't post anymore and I thought some of my posts were useless

can't beleive the size of spikos turbo! (top of page 3... cant get the pics to show for me)

[F6 UTE]

Go away and have a think about what kind of 'airflow' is in a compressed situation ( ie boost ).

There is no benefit to side entry at all.

Think of a baloon. If you pop it, will air exit quicker dependant on where you pop the f&*cker, NO, why?, coz pressure is equal no matter where the outlet is, or the feed..

Seriously, guys can't get over the fact air doesn't 'flow' inside a boosetd plenum like it does N/A plenum, it's pretty simple.

The turbo is a pump, it only 'maintains' pressure inside the plenum ( ie boost pressure ). Off boost there are benefits to a plenum, period, but no correlation betweeen side or front/rear entry to power gain off boost...

If the APS plenum was so good, why isn't it mass produced??