Andrew, I believe the 3 lb spring he is talking about is the wastegate= spring, this limits boost, the 3 lb one is the lowest boost available, as = the springs get stronger the more exhaust is forced through the turbo.

Chris?

Chrissi & Randi

www.CozyGirrrl.com<= BR>ClickBonds 10/$7.50
CG Products, Custom Aircraft Hardware
Chai= rwomen, Sun-N-Fun Engine Workshop

In a message dated 8/22/2012 6:08:30 P.M. Central Daylight Time, andrew@martinag.com.au= writes:

Chris

if your blow off valve is before the inte= rcooler, it may just be opening too soon with that 3lb spring and allowing = all your air to vent, then the engine would act as NA but with the intercoo= ler as a added restriction. try a heavier spring.

Andrew

On Thu, Aug 23, 2012 at 6:53 AM, Chris Barber <cbarber@texasattorney.net>= ; wrote:

Thanks Ed. I am pleased you verifi= ed my concern after my cooling skyrocketing yesterday when I went to full p= ower.

Trying to determine where the restriction is now.

You a= re the best.

Sent from my iPhone 4

On Aug 22, 2012, at 4:48 PM, "Ed Anderson" <eanderson@carolina.rr.com> wrote:

> Chris, = One thing to be checking on your next take off is your coolant/oil temps. &= nbsp;As you know take-off is the worst combination of low cooling air mass = flow and max engine temperature due to WOT.
>
> You would be su= rprised how quickly (with the additional power you now have) you will excee= d your cooling limits if not careful. So I would be certain to check = the temps at a frequent rate on your next take-off until you know how the s= ystem is going to react - hate to see you cook your engine during your firs= t real Turbo climb out.
>
> I find for my Rv-6A that I needed t= o get to 120 mph IAS as quick as possible to get on the good side of the co= oling curve. So that generally meant take off - get safely above surr= ound obstructions, then level off/reduce climb until airspeed hit 120. &nbs= p;Then I could resume climb with cooling gradually bring the temps down as = altitude and airflow increased. Your sweet spot airspeed would undoub= tedly be different given different platform and cooling set up.
>
= > Ed
>
> --------------------------------------------------<= BR>> From: "Chris Barber" <cbarber@texasat= torney.net>
> Sent: Monday, August 20, 2012 9:17 PM
> To= : "Rotary motors in aircraft" <flyrotary@= lancaironline.net>
> Subject: [FlyRotary] Turbo question.
&= gt;
>> As I have mentioned I have had what I think are incongruent= readings regarding my manifold pressure (mp)and engine rpm. It seems I am = getting quite low mp as I add power to higher rpm.
>>
>> = I am not well versed in this area but my thought is that as I add power, ev= en with slight boost (currently using a 3 lb spring in my wastegate) eventu= ally my mp should raise a bit more.
>>
>> Today I did som= e static test. I recorded engine RPM with the turbo hooked up and rec= orded the mp at 1000 rpm increments. Then I removed the turbo plumbing from= my intake and recorded the same info My results currently confuse me.
&= gt;>
>> With the turbo hooked up I am getting
>>
&g= t;> RPM. MP inches
>> 2000 - 14.0
>> 3000 - 15.= 5
>> 4000 - 19.3
>> 5000 - 21.6
>> 5700 - 24.5 (= topped out)
>>
>> With the turbo removed.
>>
= >> 2000 - 15.8
>> 3000 - 15.3
>> 4000 - 19.7
>= ;> 5000 - 24.8
>> 5833 - 29.8
>>
>> Is this i= ndicative of restriction in my plumbing? Perhaps in the inter cooler? A dir= ty air filter? A bad pop off valve or a leak not allowing the air pressure = getting to the intake. Or????
>>
>> I am uncertain what o= ther permitters I need to check and provide. I am just starting my diagnosi= s in my Phase One testing. I only have 1.6 hours in the air so far. I value= ya'll's direction and input.
>>
>> Heck, perhaps this is= working properly but it just doesn't seem right/comfortable.
>>>> Thanks folks.
>>
>> Chris Barber
>> H= ouston
>> Velocity SE
>> Rotary 13b turbo (?) :-)
>= >
>>
>>
>> Sent from my iPhone 4
>> = --
>> Homepage: http://www.flyrotary.com/<= BR>>> Archive and UnSub: http://mail.lancaironline.net:81/lists/f= lyrotary/List.html
>>
>>
>> -----
>>= ; No virus found in this message.
>> Checked by AVG - www.avg.com=
>> Version: 2012.0.2197 / Virus Database: 2437/5211 - Release= Date: 08/20/12
>>
>
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html

--=
Homepage: http://www.flyrotary.com/
Archive a= nd UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.= html

--
R= egards

Andrew Martin
Martin Ag
275 Newmarracarra Rd
Moonyoo= nooka WA 6532

0427477144
08 99241145
andr= ew@martinag.com.au