Fuel Cut / Boost Cut

SpeedRacer · Postby **SpeedRacer** » Fri May 16, 2008 9:14

I seriously do I really hope they fixed whatever issues they had when I had mine because it was a PITA. I don't want anyone to go through that crap.

firestoned · Postby **firestoned** » Sat May 17, 2008 9:14

Back on topic;

how much boost is too much boost do you think? Will I hit boost cut if the boost is too high? Is that safe to assume if I turn it the boost to 18 and dont get boost cut, its ok?

SpeedRacer · Postby **SpeedRacer** » Sat May 17, 2008 9:14

Eric if you wanna up boost datalog while you do it. Make sure you log knock spark and it'll let you know if your knocking in yer engine if you have no knock yer fine

for the most part...

Rich · Postby **Rich** » Sat May 17, 2008 9:14

18 lbs is past the efficiency range of our stock turbo. It's basically a hot air dryer at that point.

firestoned · Postby **firestoned** » Sat May 17, 2008 9:14

<div class='quotetop'>QUOTE (SpeedRacer @ May 17 2008, 05:37 PM) [url=index.php?act=findpost&pid=46788]<{POST_SNAPBACK}>[/url]</div>

Eric if you wanna up boost datalog while you do it. Make sure you log knock spark and it'll let you know if your knocking in yer engine if you have no knock yer fine for the most part...[/b]

i put the secondary map to 18psi, and my primary to 16, today on the way home from work, and later to the store and back, I had it on the seconday, and it pulled almost exactly 1psi more in every gear, 3rd and 4th holding at 16, 5th and 6th holding at a scary 18...sometimes 19. The car ran great, no issues, besides the spikes, which will be fixed Monday, Im just paranoid I guess as to whats too much to push with my mods, Ive heard the intercooler allows for 2-3 extra psi from stock,

I will datalog, but what parameters besides knock should I log?

firestoned · Postby **firestoned** » Sat May 17, 2008 9:14

I will say I have knock retard on my dashhawk in my face always, and I never see more than .7 or .8

Rich · Postby **Rich** » Sat May 17, 2008 9:14

Just because you're seeing more boost doesn't mean it's usable. At 18 psi your turbo will be raising your IC and manifold temps past where you want them to be.

firestoned · Postby **firestoned** » Sat May 17, 2008 9:14

I was going to say, I didnt feel much more, just a little more peppy in 3rd and 4th, and the bov is much louder at high boost

SpeedRacer · Postby **SpeedRacer** » Sat May 17, 2008 9:14

Eh 18lbs isn't paste our efficiency range at sea level but up here it is. At Sea level you can run 18 no problem really... Up here due to thinner air add about 2psi to what we are pushing normally and thats what the turbo's 'at' roughly

Rich · Postby **Rich** » Sat May 17, 2008 9:14

If I remember correctly, Brandon posted some math on the subject back in the MHM days. Stock boost is 15.6 lbs, and with our small compressor housing the turbo cannot flow enough cfm's above ~16 lbs. Also, a turbo will push whatever boost you've told it to no matter the elevation. Only problem is, as the air gets thinner, the faster your turbo has to spin to meet the same boost pressure.

SpeedRacer · Postby **SpeedRacer** » Sat May 17, 2008 9:14

Your correct thats why i said 18 is like pushing 20psi of boost.

I was lazy earlier and didn't go into the 18lbs eric was wanting to push. Yes he can push it will he get a huge increase in power probably not. Will it possibly do more harm than good? eh might wear the turbo down more than normal but nothing crazy. If he were to run meth / alch setup he could push 18lbs no problem and probably see a nice gain. I was just in a rush earlier so didn't have time to post a ton of info.

But at Sea Level it is okay to push 18lbs there's plenty of MS3's doing it with MBC's and dynoing proving it is a significant increase in power.

firestoned · Postby **firestoned** » Sun May 18, 2008 9:14

<div class='quotetop'>QUOTE (Rich @ May 17 2008, 06:21 PM) [url=index.php?act=findpost&pid=46801]<{POST_SNAPBACK}>[/url]</div>

If I remember correctly, Brandon posted some math on the subject back in the MHM days. Stock boost is 15.6 lbs, and with our small compressor housing the turbo cannot flow enough cfm's above ~16 lbs. Also, a turbo will push whatever boost you've told it to no matter the elevation. Only problem is, as the air gets thinner, the faster your turbo has to spin to meet the same boost pressure.[/b]

i guarantee there is a big difference between 16 and 17psi, im not sure i believe that the cfms are max'd out at 16

SpeedRacer · Postby **SpeedRacer** » Sun May 18, 2008 9:14

I dunno all this damn talk makes me want to get a bigger turbo thats what I know.

Roadrnr06 · Postby **Roadrnr06** » Sun May 18, 2008 9:14

<div class='quotetop'>QUOTE (SpeedRacer @ May 18 2008, 09:59 AM) [url=index.php?act=findpost&pid=46881]<{POST_SNAPBACK}>[/url]</div>

I dunno all this damn talk makes me want to get a bigger turbo thats what I know.[/b]

Do it josh you know you want to.

SpeedRacer · Postby **SpeedRacer** » Sun May 18, 2008 9:14

I'm gonnan eventually gotta move and do a lot of other stuff first... But I will be doing it no worries.

Fuel Cut / Boost Cut

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