Where did you plumb your boost controller into ? UIM is no good !
09-22-2009, 07:23 PM
#201
That was the purpose of my 9 PSI dyno - to sell kits, not boost controllers.
You are really reaching for straws now.
Last edited by MazdaManiac; 09-22-2009 at 07:26 PM.
09-22-2009, 07:50 PM
#204
What do you mean from a standstill , I presume you mean accelerating from 2000 rpm or something ? I know spool is slower from down there - of course it is . If you agree to demonstrate what yours does at that rpm i'll do the same test here . But I'm not going to post my one without some commitment from you to do a test as well .
previous post - for your consideration when you get around to it ....
09-26-2009, 03:24 PM
#210
In all other scenarios my setup acts identically to plumbing it in to the UIM - there is no downside whatsoever. Think about it - my wastgate does not open till my BC sees the "start boost" figure which I currnetly set at 8 psi .
MOST people do not run HKS or Synchronic , they run a greddy type RS or similar . So for MOST people my setup will work better .
Making it more righterer than your way
09-26-2009, 03:28 PM
#211
Not true - in your set up; ANYTIME the manifold pressure is lower than your charge piping, your turbo will spin at a lower RPM than mine since you will be opening the wastegate sooner...
On a rotary it really doesn't matter since our motors are good turbo motors (especially with both of our fairly small turbo's)... but it is still wrong. And on a piston motor or a big turbo motor is WILL be noticeable.
On a rotary it really doesn't matter since our motors are good turbo motors (especially with both of our fairly small turbo's)... but it is still wrong. And on a piston motor or a big turbo motor is WILL be noticeable.
09-26-2009, 03:44 PM
#215
I know! But I am talking about the drop in turbo RPM's dude!
Your turbo rpm's are going to be lower than mine at part throttle since your slowing it down some... you have to make up for that lack of inertia where-as a properly set up turbo car does not.
Let me draw another analogy and see if it helps.
One of the tricks open to tuners on oversized turbo's is to retard timing in order to dump more heat into the turbine to spool it up faster...*cough* Esmeril *cough*.
Using the int-x and taking some timing out at boost threshold I can get that silly thing to boost about 500 RPMS faster.... ok cool - BUT when you hit that RPM not boosting you are sacrificing power - does it make it work? Yeah if the owner is willing to make the trade off, but it is isn't RIGHT - so why would I write a DIY talking about how all these turbo guys' timing maps are wrong and need to be fixed?!?!?!? It is an isolated scenario and simply a work around for a shortcoming in the system.... and only if the owner is willing to make the trade off.
Your turbo rpm's are going to be lower than mine at part throttle since your slowing it down some... you have to make up for that lack of inertia where-as a properly set up turbo car does not.
Let me draw another analogy and see if it helps.
One of the tricks open to tuners on oversized turbo's is to retard timing in order to dump more heat into the turbine to spool it up faster...*cough* Esmeril *cough*.
Using the int-x and taking some timing out at boost threshold I can get that silly thing to boost about 500 RPMS faster.... ok cool - BUT when you hit that RPM not boosting you are sacrificing power - does it make it work? Yeah if the owner is willing to make the trade off, but it is isn't RIGHT - so why would I write a DIY talking about how all these turbo guys' timing maps are wrong and need to be fixed?!?!?!? It is an isolated scenario and simply a work around for a shortcoming in the system.... and only if the owner is willing to make the trade off.
09-26-2009, 04:17 PM
#216
Now take your typical turbo owner with a Greddy RS or similar BOV and plumb the BC to the UIM and set start boost to 8psi .
What pressure do you think the charge pipe will build to at part throttle ? You can't really answer that because the BC does not control the wastegate until you go WOT.
What it did to my setup was build to 20psi under part throttle at about 5000 rpm which , if you just opened the throttle a little more , sent a sudden rush of air to the engine making it damn near impossible to accurately control the throttle . The only time that I found this to be a concern was 1/2 way around a corner . I considered this enough of a problem to do something about it because I like my car and want to stay alive .
I believe EVERY Greddy owner with a cheap diaphram BOV (MOST Greddy owners) and his BC hooked into the UIM will have this issue. Although if they set their 'start boost' to say 1 psi , the problem will not be nearly as bad . But that is not "Right" either is it ?
Sure you can say , "get a decent BOV " and you wont have that issue . But a good BOV is just solving a problem that would not even be there if you plumb it the way I've been suggesting.
Last edited by Brettus; 09-26-2009 at 04:40 PM.
09-26-2009, 04:41 PM
#217
A good BOV is cheaper than an EBC... so that isn't really a super valid argument.
And even a crappy BOV if tuned right would not have as much of an issue (you just have to recirc it; and then loosen the load on the spring by a LOT.
But I never mentioned BOV's - I said RPM of the turbo... the goal is simple; keep the turbo running as fast as possible at all times...... the excess pressure just then needs to be dealt with.
The only reason why we have vacuum and boost is because the compressor design is imperfect..... in a perfect world you would be running around at 10 PSI all the time.
And even a crappy BOV if tuned right would not have as much of an issue (you just have to recirc it; and then loosen the load on the spring by a LOT.
But I never mentioned BOV's - I said RPM of the turbo... the goal is simple; keep the turbo running as fast as possible at all times...... the excess pressure just then needs to be dealt with.
The only reason why we have vacuum and boost is because the compressor design is imperfect..... in a perfect world you would be running around at 10 PSI all the time.
for retards only LOL
09-28-2009, 01:23 AM
#224
i think so - yeah that fluttering noise . thought that was called surge ?
Had a word with NGO - seems I was mistaken . The noise is just his BOV doing it's job - IE letting the excess pressure go at part throttle .
Had a word with NGO - seems I was mistaken . The noise is just his BOV doing it's job - IE letting the excess pressure go at part throttle .
Last edited by Brettus; 09-28-2009 at 02:07 AM.
09-28-2009, 05:31 PM
#225
