Ported Wastegete?

[TheBreeze]

It seems that to run lower boost numbers at low altitude (1000 ft) the waste-gate needs to be ported? I am hearing that the 2860 will only be able to be turned down to 7.5 ish at this altitude with an unmodified waste gate. Kit is a 2010 Boondocker race gas turbo with intercooler, and ebc.

My concern is that even at 7.5 lbs I am going to need pretty high motor octane to be safe with the stock 2010 high compression head at 1000ft. (Like sunoco 112 or more) I want to keep the high compression head in place, and will not be switching heads back and forth from low to high elevation.

I would like to run straight 100LL or Sunoco 110 at worst.

Does a ported waste gate cause any downside when used at high altitude? I will be using the sled up high through out the season as well and if it hurts high altitude performance, I would be very likely to leave it well enough alone.

Any input is appreciated.

 

[kcdavidak]

i have same kit 2010 m8 bd rg ic. ride mostly at 2000ft run at 8.5-9lbs straight pump 91 four ounces lucas octane boost. my dc out is at 94-97 depending on load on the engine.with the low boost actuator from bd should be able to turn it down to 4.5-5lbs ,which is where i started at with pg kit,then up graded to race gas,still running pg.could get 8lbs but dc out was maxed out hense the up grade.

 

[kcdavidak]

forgot 2009 head ,might be hard to get lower with 2010head,and definetly needs better fuel.

 

[TheBreeze]

The sled does currently have the low boost actuator installed.

 

[kcdavidak]

the difference must be the head then, imo id change the head run 100ll and not worry about changing it back and forth, havent run the up grade at altitude yet,last year ran pg at alpine wy 8lbs dc out 97

 

[TheBreeze]

I guess to clarify, I have not run the sled at low elevation yet. I am just going off of what I have read in the past regarding people needing to port the waste gate to get low boost at sea level due to boost creep. So you think I will be able to get it down to 5-6 psi at 1000 ft?

The head should not affect the amount of boost, or in this case, the amount of air the waste-gate can bleed off. But I am by no means an expert. But if I drink enough beer, I do think I know everything......lol

 

[wasatchcomm]

i think with your kit(same as mine) you should be able to run 6-7lbs at 1000' on straight avgas.
ive run mine at 9lbs at 3k all day, only seen octane flash at me 1 time, dropped it down 1lb and no more codes.
i think with the 2010 head and the kit you are running you would be good at that elevation with the avgas, but i would start at 6lbs on the ebc.
good luck...

 

[diggerdown]

Most guys put a 09 or earlier head on. Less apt to deto and no downside at elevation other than add a pound of boost. Just got back from the Horns and helped out a guy with a 2010 M8 boondocker race gas turbo and a 162" track. 9800 ft. We had a pretty good slope and not bad snow. I got halfway up, MM and Pat got a few feet better than me and the turbo went over the top with over 70mph track speed running 91 Octain. He had a 09 head on and said he should be able to run at sea level with less than 100.

 

[slash]

why would porting change the way a wastgate works porting changes flow not presure

 

[w2bridin]

I am running 8psi @800 ft. 2010 m8 w/push pg tial stock 2010 head. I am running straight 100 LL. I put about 400 miles on it at low alt. No problems. I did put a 2 deg. Timing key in it don't know if that makes much difference as didn't try without. Hope this helps ya.

 

[TheBreeze]

why would porting change the way a wastgate works porting changes flow not presure

It allows the waste-gate to flow more air, allowing lower boost numbers without boost creep. I swear I have read that you can not turn down a M8 turbo to the 4-5 psi range at sea-level without a ported waste-gate, because the boost will creep up to the 6.5-7.5 psi range because the waste-gate can not bypass enough exhaust to keep the boost down. However, if 7-8 psi is sustainable on 100ll with the 2010 head, Ill just run with that.

 

[wasatchcomm]

However, if 7-8 psi is sustainable on 100ll with the 2010 head, Ill just run with that.

you should be fine
only way you might run out of octane is if your charge temps get up high, which would only be a problem on warm spring days, tshirt riding....

 

[JasonAK]

Great thread!

I have found that I can run 8psi at 800ft with the 2009 head no problem with 100LL. Next I plan to try the 2010 head with the -2 Degree timming key.

Jason

 

[TheBreeze]

Great thread!

I have found that I can run 8psi at 800ft with the 2009 head no problem with 100LL. Next I plan to try the 2010 head with the -2 Degree timming key.

Jason

Have you tried adjusting your boost all the way down to see what the lowest "runnable" boost level is at your altitude? i.e. can you turn it down to 4-5 psi?

 

[TheBreeze]

Any of you heavy hitters out there have any input on this? Product Tester? Push Turbos? I know you looked...... lol

Its hard to find much for solid information when it comes to running these things down low.

 

[JasonAK]

Have you tried adjusting your boost all the way down to see what the lowest "runnable" boost level is at your altitude? i.e. can you turn it down to 4-5 psi?

I have not been able to get a low boost actuator for my turbo set up from PUSH. The one that came with my Push pump gas kit would boost over 11 psi. So I got one off Ebay that claimed to be 3-7 psi. but on my sled it runs a 8 psi. and then will creep up some in a climb. I am currently looking for a actuator that will open at 6 psi. that way I do not have to worry about running out of fuel with the two injector set up. I will be upgrading my fuel pump this summer as well as fuel control (i.e. Boondocker Box of power comander).

Jason

 

[slash]

sounds like theres to much restriction in the exh and the presure cant escape , I would try a seperate wastgate tube

 

[slash]

but what do I know I only build 35 40 55 and 60 series turbos

 

[TheBreeze]

sounds like theres to much restriction in the exh and the presure cant escape , I would try a seperate wastgate tube

Wouldn't that yeild similar results to "porting" the wastegate thus allowing it to vent more pressure/air? You said that porting only affects flow, not pressure. But a better "flowing" waste-gate should help alleviate the pressure I would think. I am in no way saying you are wrong, or don't know what you are talking about, just trying to fully understand this. I'm sure you know a lot more than be about turbo's as I admittedly don't know much. Heck, I don't even know what 30, 40, 55, 60 series turbos really are, other than they sound big!

 

[YETIms]

you are not the only one looking for a actuator for 3-4psi boost.

if you find one, let me know

I have not been able to get a low boost actuator for my turbo set up from PUSH. The one that came with my Push pump gas kit would boost over 11 psi. So I got one off Ebay that claimed to be 3-7 psi. but on my sled it runs a 8 psi. and then will creep up some in a climb. I am currently looking for a actuator that will open at 6 psi. that way I do not have to worry about running out of fuel with the two injector set up. I will be upgrading my fuel pump this summer as well as fuel control (i.e. Boondocker Box of power comander).

Jason