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Thread: Lynch's 6spd / VE-T thread

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Posts: 511-520 of 1,893
2012-03-26 14:03:58
#511
Originally Posted by Vadim
About time





Actually it's not pointless. If your running just wastegate spring pressure, using the nipple on turbo will yield you about 1-2psi less then running from the around the manifold. If you are running a boost controller then you can adjust for that and be fine.



o really? Got anymore info to back up this claim
2012-03-26 14:05:23
#512
Originally Posted by morgans432
then why have that nipple there


just because it's there don't mean you HAVE to use it.

i
2012-03-26 14:06:44
#513
Originally Posted by morgans432
o really? Got anymore info to back up this claim


not a claim, plenty of info and facts around. intercooler and lots of intecooler pipes drops pressure. buy the time it gets to the intake manifold, the 8psi spring will read 7 or less. running it from near intake manifold will account for pressure drop and keep the wastegate closed longer thus you have more boost. Also running wastegate on vacuum is no good should be before throttle body
Last edited by Keo on 2012-03-26 at 14-10-34.
2012-03-26 14:08:18
#514
Originally Posted by morgans432
o really? Got anymore info to back up this claim


Yup, intercooler and piping pressure drop. I've seen it personally, but if you search you will find plenty of members having the same issue.
2012-03-26 14:09:02
#515
yes thats not what im talking about. I'm talking about the nipple on the turbo connecting to the wastegate I dont see how that will drop 2psi

I understand the concept of keeping your intercooler piping as short as possible
2012-03-26 14:14:29
#516
Originally Posted by morgans432
yes thats not what im talking about. I'm talking about the nipple on the turbo connecting to the wastegate I dont see how that will drop 2psi

I understand the concept of keeping your intercooler piping as short as possible


boost pressure at the compressor housing will be more than what's in the intake manifold area. (looking for the thread for you, i can't think and type without confusing everyone.)

even if the intercooler pipe is really short, most intercooler will still drop the pressure about 1 psi.
Last edited by Keo on 2012-03-26 at 14-19-56.
2012-03-26 14:24:28
#517
its okay keo i will do my own research
2012-03-26 14:38:31
#518
Looks good man. Can't wait for a ride.

Is it done done? Did you drive it home?
2012-03-26 15:26:31
#519
Its very much true, if you have a 1psi pressure drop from the turbo to the manifold then its common sense to say if you use the nipple on the compressor that you will open the wastegate 1psi sooner than if you had it on the manifold.

Pretty simple stuff.

Most intercoolers have about a .3 psi pressure drop so at the most with piping and everything your safe to say about 1 psi at the most difference.
2012-03-26 18:02:30
#520
Thing is, it might depend on the intercooler too. If you are using a high quality one ($300+ easily) then you may not see any issues. Most of us are running $100 eBay ones....


On another note look at this thread: http://www.bimmerfest.com/forums/showthread.php?t=120057

In my setup, I have two analog pressure sensors, one mounted before and the other after the intercooler. Both send signals to a A/D convertor and into a micro-processor. While a pressure gauge can give a more continous needle reading, a A/D converter captures data at a preset sampling rate. This means I have analyze pressure gradients rather than instantaneous pressure points.

Here's a sample of a data I gathered from one track session at Buttonwillow. Graph shows Pre-IC and Post-IC pressure data. Please note: 0.1kgf/cm^2 is about 1.42psia.
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