3800 Series III Turbo...

[Guest]

(nocutt @ Jul. 07 2005,16:40)Q
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EThanks Holst...'preciate that...I was starting to think no one cares
No One Cares Until They're Turbo'ed



But seriously.. I'm following this one now. The things you've done to this car are amazing and will definitely inspire others to get some serious modifications of their own in the works.

[96BlackRoseZ26]

Damn...This thing is looking great.  I only wish I had the time/resources to do something like this to my baby.  Someday maybe....Looks killer though

[Norm 88GT]

nocutt, here is goal:

http://www.cartuning.ca/prodserv.html

Is there any reason you should not see 300whp?

Norm

[nocutt]

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ENo One Cares Until They're Turbo'ed

LoL!! N-O-C-U-T-T ...Good one holst, I was just getting tired of the soliloquy...no that I mind talking to myself...I just seem to be usually answering...

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EDamn...This thing is looking great.

10q BlackRose...
I unfortunately have exactly one more month to complete...hopefully this happens...  



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Is there any reason you should not see 300whp?

Norm my goal is to push 10psi...effectively...keyword!
From the stock compression, stock cam and how I intend to do intake and exhaust, I had better see nothing less than 300whp...how it is used is another question...I am really banking on this new suspension...but yes there shouldn't be any reason not to get the aforementioned... (fingers crossed)

[nocutt]

So while I am still waiting for the exhaust mani...we take several external wastegates three in this pics but we test 5 including an intergral wastegate...
we are looking for wastegate cracking pressure...this is the pressure that lifts the wastegate of their respective seats...

Anwyaz from the three pictured here....the worse seems to be the turbonetics (in the 11'O clock position) the best was the custom IRL wastegate ( @ the ~9 O'clock position)...



The turbonetics was set at 7psi but at ~4.8-5.0 psi the wastegate starts to open, this is really not good because the turbo tends to work harder creating inefficiency and basically a less broader TQ curve so to speak...you do not want to bleed any pressure except at the proposed psi...in this case 7psi...the indy wastegate was set at 7psi also (there are actually two) and would open at 6.5psi...not bad really...ironically WCF had a customer who was complaining about boost creep from using the turbonetics markII (pictured)...



This are there respective inlets...the indy has a 50.8mm inlet (flange) the wastegate @ the 3 O'clock position was mediuam in the test and had an inlet flange of ~38.1mm (36mm) and the turbonetics was @ 25.4mm  ...yep if your configuration is breathing exceptionally don't use a turbonetics or 25.4mm inlet wastgate. If you are planning to go higher (boost) then one can use some sort of solenoid that can keep boost creep in check without having resort to a bigger inlet flange or bigger wastegate...

[z284pwr]

Well isn't it true that generally the more PSI your running the smaller the wastegate has to be because more exhaust has to pass through the turbine wheel as compared to lower boost where your trying to get more exhaust to escape through the wastegate before, so the less psi the more exhaust you need to rid as compared to higher boost?

[rweatherford]

All of those things are variable depending on the turbo sizes, exhaust size, etc...

[nocutt]

(z284pwr @ Jul. 09 2005,15:24)Q
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EWell isn't it true that generally the more PSI your running the smaller the wastegate has to be because more exhaust has to pass through the turbine wheel as compared to lower boost where your trying to get more exhaust to escape through the wastegate before, so the less psi the more exhaust you need to rid as compared to higher boost?
In a perfect world a wastegate would not be needed...  
Too much seems to ride on this...as mentioned by Rex, however a compromise MUST be made when choosing a wastegate; inrespective of turbo app!!
Obviously the smaller the inlet hole, the potential of creating boost creep and all the things associated with it, while the bigger the inlet the more exhaust can be wasted as soon as crack pressure is reached.
Our conclusion, all pnuematic wastegates have this inherent problem, NB: psi is psi in this environment...it is critical especially when asked to relieve psi @ low boost...and from our experiment the design of the wastegate seems to be a factor here...
Z284pwr...
*low boost = big wastegate (or stiffer spring rate, which is why an intergral works much satisfactory IMO)
why? have to vent excess xhaust pressure to keep target boost...of course, hot A/R is also critical, a bigger A/R would not have to vent excess exhaust because one needs it to spool...compromise!!
* high boost = big wastegate...now you are delivering more psi...it has to get out efficiently...moreoso from High RPM motors...
my head hurts  

[rweatherford]

Our gate on our 1500+ HP pulling tractor is about the size of your middle gate. (340 Cu in)

This engine has a staged turbo system (2 chargers), runs on methanol and 65-75 PSI.  On a tough track in high gear it will start to creep boost on first stage, which raises overall boost.  On light load tracks the first stage is lazy.  It needs a bigger gate IMHO, but it works pretty good.

[RebelGT]

(nocutt @ Jul. 10 2005,05:38)Q
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is the wastegate on the far right an actual HKS wastegate or is it the knockoff? I picked up one of those sized at 40mm for my HX40.

[nocutt]

(rweatherford @ Jul. 09 2005,23:18)Q
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EOur gate on our 1500+ HP pulling tractor is about the size of your middle gate. (340 Cu in)...
ahhh...that will make sense, I am guessing the tractor uses a very HUGEmongous xhaust A/R in which case it will have to 'bleed' some xhaust thru a smaller port...good thing the tractors don't see High RPMs I am sure the thing will keep on boost creeping...intereseting!

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Eis the wastegate on the far right an actual HKS wastegate or is it the knockoff? I picked up one of those sized at 40mm for my HX40.
...Rebel
          SSautochrome, I believe it is a knock off...however for the price they are well designed  

[RebelGT]

yep, my thoughts exactly nocutt, i wouldn't buy a turbo from them though(i've heard alot of bad things).
I looked my gate over and it appears to be pretty well put togethor for the money, the tolerances are tight and all the pieces looked solid enough. I'll post pics when my lq1 manifolds are finished...

[nocutt]

(RebelGT @ Jul. 10 2005,13:38)Q
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Eyep, my thoughts exactly nocutt, i wouldn't buy a turbo from them though(i've heard alot of bad things).
I looked my gate over and it appears to be pretty well put togethor for the money, the tolerances are tight and all the pieces looked solid enough. I'll post pics when my lq1 manifolds are finished...
Curious two ?'s what xhaust A/R are you going to be using on that holset...(BTW it is one of my favorite turbos) ÂÂÂ
the next question are you making new manifolds for the LQ or just the xovers?

[rweatherford]

Yes large A/R's and large turbos.  SD-A90 or something to that effect on one of them.  I have forgotten the exact specs.  They have custom trimmed turbine wheels too.

Max RPM is about 5000 on a flat 2-valve head.

[JOKERZ26]

Damn Disneyland, Universal Studio's, and Knotts Berry Farm....this is L.A.'s newest attraction.  When are tickets going to be available to ride this?  I get the SoCal discount right?