Forced Induction Superchargers | Turbochargers | Intercoolers
View Poll Results: Whats the best CR to have for 15-22 pounds of boost?
11:1
8
2.87%
10.5:1
4
1.43%
10:1
20
7.17%
9.5:1
59
21.15%
9:1
67
24.01%
8.5:1
95
34.05%
8:1
26
9.32%
Voters: 279. You may not vote on this poll

CR for big boost...

Old Mar 6, 2008 | 10:29 AM
  #121  
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Now we have this thread going somewhere, I love it! To the guy wanting to run 20psi on 10:1 with a centri.............. I'd love to see that. I thought you said that you don't like changing haed gaskets? Make sure you run studs since its allot easier to change gaskets when you get there

BTW you guys are making me feel better about my lower CR again but if need be in the future, for a change up, I'll have the option to up the CR a half a point or so. No regrets and glad I chose this to start with anyways!
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Old Mar 6, 2008 | 10:35 AM
  #122  
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Originally Posted by Websy21
Now we have this thread going somewhere, I love it! To the guy wanting to run 20psi on 10:1 with a centri.............. I'd love to see that. I thought you said that you don't like changing haed gaskets? Make sure you run studs since its allot easier to change gaskets when you get there

BTW you guys are making me feel better about my lower CR again but if need be in the future, for a change up, I'll have the option to up the CR a half a point or so. No regrets and glad I chose this to start with anyways!
I don't see gaskets being an issue, there's a reason they added extra head bolts on the lsx block that's good to 2500hp I will be using studs though regardless.
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Old Mar 6, 2008 | 11:31 AM
  #123  
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Originally Posted by Ponyhntr
I was referring to this comment of yours:



I was just pointing out that your statement isn't 100% accurate. Even on LSx engines.

No problem bro! I wish they made a setup for me like they do with the Stangs-problem is my steering rack is in the way. At least I don't have to worry about breaking the crank!
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Old Mar 6, 2008 | 01:08 PM
  #124  
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Originally Posted by rufretic
I always thought it was the added boost that causes them to go because those are the only people I've heard having issues. Plus your turbos run a lot hotter than my procharger will, which I thought I remember making a difference on when you start to blow gaskets. Doesn't the added heat cause detination, causing gaskets to blow? I'm not sure, I'm not a mechanic but I do a lot of research so I can try to make reasonable decissions.
I ran 14psi on a stock block with stock gaskets with no pushing water or having to switch gaskets at all. I think it could of ran a long time like that if my oiling system was keeping up with the high rpms. It hade a good tune and was seeing no kr. 14psi, 682rwhp @ 6800rpm is a lot to ask of the stock 346 and I was taking it up to 7250rpm so most likely more boost and more power, the oiling system didn't keep up and boom. I knew it was a time bomb but I was planning to rebuild so I wanted to see if I could get 9s.
The new build will have a little less compression(10:1), a little more boost(18-20), a lsx 408 with etp heads with the extra mounting holes, race gas and a lot more power and I don't see me having any issues with gaskets. If I followed what eveyone else did, how do I ever improve on it? I want to have something better than the average FI build. All speculation until it's finished but I'm feeling pretty confident so I guess we'll have to wait and see.

I hope it works out well for you! A 6 bolt LSx will work better, I just don't see the upside to higher compression. Good luck, Andy.
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Old Mar 6, 2008 | 01:46 PM
  #125  
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Originally Posted by LASTLS1
I hope it works out well for you! A 6 bolt LSx will work better, I just don't see the upside to higher compression. Good luck, Andy.
Thanks. You obviously did something right with your set-up to be running that fast. Your running turbos though which can easly make a lot more boost than the F1 that I plan to run, so I'm just taking a little different route.
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Old Mar 6, 2008 | 02:13 PM
  #126  
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Originally Posted by rufretic
Thanks. You obviously did something right with your set-up to be running that fast. Your running turbos though which can easly make a lot more boost than the F1 that I plan to run, so I'm just taking a little different route.
I'm glad you are listening to someone on lower CR with high boost even if you wouldn't listen to me.
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Old Mar 6, 2008 | 03:06 PM
  #127  
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Originally Posted by CALL911
I'm glad you are listening to someone on lower CR with high boost even if you wouldn't listen to me.
It's not that I'm not listening to you, I just don't agree with a lot of what you are saying. LASTLS1 has a very fast car so it's hard to argue that my set-up will work better or worse, a lot more goes into how fast you go than what cr you run. In my opinion his car could be even faster with a higher cr. Just because I can agree that his car is very fast, does not mean I agree with his opinion on cr. But I am listening to everyone. Then I can make my own judgment on what I think will work best for me. The difference between him and you is that you keep trying to prove me wrong which isn't going to happen because there is no right answer, it just depends on how fast you want to go with what set-up. If everyone used the same set-up, everyone would have equal cars. Sounds pretty boaring to me.
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Old Mar 6, 2008 | 03:59 PM
  #128  
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I am not out to "proove" anything, and what I have been telling you is the same as LASTLS1 is that lots of boost and a high CR will equal maintenance issues such as blown headgaskets, and that the better way to go about it is with lower CR, just as LASTLS1 stated "boost is more friendly than compression".

I just find it almost comical how a poll with more than 150 voters show this, and you ignored it completly (or at least seemed to) until someone like LASTLS1 stated that he agreed with it.
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Old Mar 6, 2008 | 05:47 PM
  #129  
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Originally Posted by CALL911
I am not out to "proove" anything, and what I have been telling you is the same as LASTLS1 is that lots of boost and a high CR will equal maintenance issues such as blown headgaskets, and that the better way to go about it is with lower CR, just as LASTLS1 stated "boost is more friendly than compression".

I just find it almost comical how a poll with more than 150 voters show this, and you ignored it completly (or at least seemed to) until someone like LASTLS1 stated that he agreed with it.
What's comical? My opinion never changed, just because I was interested in what he had to say more than you or the pole, doesn't mean I'm now going with 8:5. I'll learn more from the one person that runs 8s over the opinion of 150 people that 90% are running 12s for all I know.
What I find funny is how swayed people can be by a pole on the Internet. That's why I said most people are sheep earlier in the thread. If you want to be a follower and go with whatever the "pole" says, that's fine. I bet your the type that has a pole to see what wheels to buy because if 56% of people think they are the coolest that makes them the best right. I don't make my judgments off of poles, I make them off my own personal preferences and off my own personal knowledge. I gain more knowledge from people that are faster than me(like LASTLS1) not slower people like most of the people that voted. You should find something more important to do than worry about what cr I will use. I'll still be using 10:1. Now leave it alone, I don't care what the pole says, everyone else can follow that for all I care and me and the few others that aren't scared can be the innovators that try things a little different in the quest for more power.
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Old Mar 6, 2008 | 05:56 PM
  #130  
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No one setup is the right one as you have to look at it as a whole and not only CR, enough said
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Old Mar 6, 2008 | 07:30 PM
  #131  
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Originally Posted by rufretic
What's comical? My opinion never changed, just because I was interested in what he had to say more than you or the pole, doesn't mean I'm now going with 8:5. I'll learn more from the one person that runs 8s over the opinion of 150 people that 90% are running 12s for all I know.
What I find funny is how swayed people can be by a pole on the Internet. That's why I said most people are sheep earlier in the thread. If you want to be a follower and go with whatever the "pole" says, that's fine. I bet your the type that has a pole to see what wheels to buy because if 56% of people think they are the coolest that makes them the best right. I don't make my judgments off of poles, I make them off my own personal preferences and off my own personal knowledge. I gain more knowledge from people that are faster than me(like LASTLS1) not slower people like most of the people that voted. You should find something more important to do than worry about what cr I will use. I'll still be using 10:1. Now leave it alone, I don't care what the pole says, everyone else can follow that for all I care and me and the few others that aren't scared can be the innovators that try things a little different in the quest for more power.

I don't look at polls for my selection either. I look at what works successfully time and time again for what I want. I didn't need this poll for me. I put it up as proof that most don't think that doing a high boosted motor with high CR even on race gas is a good idea for a different thread that had others with similar opinions such as yourself.

I already have a built motor with 15#'s of boost with 8.8:1 CR on pump gas and am very happy with it. And I don't mean to argue with you as we clearly have a difference in opinion on this.

As stated earlier we will have to agree to disagree. I strongly believe what LASTLS1 said is true that boost is more reliable than compression. And thats why myself and others who voted they way they did on this poll from experience with it, rather than a random guess at what we think might work. Lower CR with high boost will equal a setup that will last, and withstand abuse along with a killer amount of power such as in LASTLS1's car. You on the other hand (and you are not alone either on this) feel that it is better to run the risky route of high CR and high boost. Even though I can't personally see the good in this as you might gain a few ponies at the huge expense of blowing the motor in some shape or form, it is what you believe and how you feel, and I am not out to change your mind as you might think. I hope it works out well for you, and you don't run into as many problems that I and LASTLS1 think you might.
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Old Mar 6, 2008 | 09:38 PM
  #132  
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Originally Posted by CALL911
I don't look at polls for my selection either. I look at what works successfully time and time again for what I want. I didn't need this poll for me. I put it up as proof that most don't think that doing a high boosted motor with high CR even on race gas is a good idea for a different thread that had others with similar opinions such as yourself.

I already have a built motor with 15#'s of boost with 8.8:1 CR on pump gas and am very happy with it. And I don't mean to argue with you as we clearly have a difference in opinion on this.

As stated earlier we will have to agree to disagree. I strongly believe what LASTLS1 said is true that boost is more reliable than compression. And thats why myself and others who voted they way they did on this poll from experience with it, rather than a random guess at what we think might work. Lower CR with high boost will equal a setup that will last, and withstand abuse along with a killer amount of power such as in LASTLS1's car. You on the other hand (and you are not alone either on this) feel that it is better to run the risky route of high CR and high boost. Even though I can't personally see the good in this as you might gain a few ponies at the huge expense of blowing the motor in some shape or form, it is what you believe and how you feel, and I am not out to change your mind as you might think. I hope it works out well for you, and you don't run into as many problems that I and LASTLS1 think you might.
Well said. It's pretty much just a matter of opinion and most, like the pole shows, choose the safer route rather than the most power potential.
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Old Mar 7, 2008 | 01:00 PM
  #133  
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Originally Posted by Websy21
No one setup is the right one as you have to look at it as a whole and not only CR, enough said
I said that earlier and got kicked in the nuts for it.


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Old Mar 10, 2008 | 12:53 PM
  #134  
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Just want to point out for all of ye nay sayers for low compression with Race fuel. Tell that to David Bowman's 2002 running 8:5:1 with C16, who is running 7's in the 1/4. Do you think he would get better numbers with higher compression? I doubt it, but I bet you he would run into more reliability issues at least down the road running higher compression. Just pointing out actual build numbers according to GMHTP April issue. Congrats on the article David Bowman. Truly a bad *** ride. 8:5:1 For the win, I bet you cant tell the compression I am running
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Old Mar 10, 2008 | 01:06 PM
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Originally Posted by LS2Camaro
Just want to point out for all of ye nay sayers for low compression with Race fuel. Tell that to David Bowman's 2002 running 8:5:1 with C16, who is running 7's in the 1/4. Do you think he would get better numbers with higher compression? I doubt it, but I bet you he would run into more reliability issues at least down the road running higher compression. Just pointing out actual build numbers according to GMHTP April issue. Congrats on the article David Bowman. Truly a bad *** ride. 8:5:1 For the win, I bet you cant tell the compression I am running

And you believe everything you read-especialy coming from a magazine? You think he's going to spill the beans on all his secrets?

Now all of a sudden everyone's bringing in 7 second full out race cars? You know the ones with air to water intercoolers, giant fuel pumps, giant feed lines, fuel cells, stand alone computers, etc, etc, etc,....

Go ahead run 8.1 run 25psi and let me know how your fuel system likes it when you ask it to run another 25psi more than the stock 45 or 60-so like 85 psi in pressure-just pray they never let you down.

I'll take my pump gas 10.1, 912 rwhp with a baby blower F1A making 17-18psi through an auto any day. PUMP GAS BABY!!!!!!
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Old Mar 10, 2008 | 01:07 PM
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Originally Posted by rufretic
Well said. It's pretty much just a matter of opinion and most, like the pole shows, choose the safer route rather than the most power potential.

**** THAT-find a good engine builder and tuner-if I wanted safe I'd buy a honda 22" rims!
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Old Mar 10, 2008 | 01:23 PM
  #137  
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Originally Posted by eb02z06
And you believe everything you read-especialy coming from a magazine? You think he's going to spill the beans on all his secrets?

Now all of a sudden everyone's bringing in 7 second full out race cars? You know the ones with air to water intercoolers, giant fuel pumps, giant feed lines, fuel cells, stand alone computers, etc, etc, etc,....

Go ahead run 8.1 run 25psi and let me know how your fuel system likes it when you ask it to run another 25psi more than the stock 45 or 60-so like 85 psi in pressure-just pray they never let you down.

I'll take my pump gas 10.1, 912 rwhp with a baby blower F1A making 17-18psi through an auto any day. PUMP GAS BABY!!!!!!
I am sure they would lie about the compression because thats such a give away to his build . He specified what he didnt give away for specs. I dont believe everything I read thats not hard to believe so why would they lie abobut that? I will take my pump gas build 8:5:1 to 20psi and get 900rwhp through an auto and my fuel system would not be a problem at all, you think I am a fool and didnt keep a fuel system in mind when building the car? I am sure the 2000HP magnafuel with 96lb injectors and F.A.S.T XFI computer will be begging for more when I up the boost with my "BABY" S85 Turbo.
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Old Mar 10, 2008 | 01:30 PM
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Originally Posted by LS2Camaro
I am sure they would lie about the compression because thats such a give away to his build . He specified what he didnt give away for specs. I dont believe everything I read thats not hard to believe so why would they lie abobut that? I will take my pump gas build 8:5:1 to 20psi and get 900rwhp through an auto and my fuel system would not be a problem at all, you think I am a fool and didnt keep a fuel system in mind when building the car? I am sure the 2000HP magnafuel with 96lb injectors and F.A.S.T XFI computer will be begging for more when I up the boost with my "BABY" S85 Turbo.
And you need a Fast computer to get you 900? Come on? When you hit your 900 let me know-I'll be at 1000. On the stock computer, with AC, with a AOD-I'll drive over to Denver to say hi!( When the Raiders are in town to pussywhip the Bronco's) Let me know how many road trips your magnafuel and turbo 400 will do!



This thread is never going to end!!!!I still haven't voted yet either!!!!!
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Old Mar 10, 2008 | 01:40 PM
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Originally Posted by eb02z06
And you need a Fast computer to get you 900? Come on? When you hit your 900 let me know-I'll be at 1000. On the stock computer, with AC, with a AOD-I'll drive over to Denver to say hi!( When the Raiders are in town to pussywhip the Bronco's) Let me know how many road trips your magnafuel and turbo 400 will do!



This thread is never going to end!!!!I still haven't voted yet either!!!!!
LOL yeah because the raiders are good and have won like once in what the last 10 years . Did I need the FAST to go that fast? No pun intended. No, but do I like the extra capabilities? Yes. When you hit 1000 let me know so I will be sure and not to be around as your engine goes BOOM!!! Stock AC here as well, and the point? Seems this thread has gone off topic talking about what the Raiders never do, but back to the topic, pointing out that a low compression build with RACE gas can yield great numbers. But I guess you have to physically inspect the car to make sure the compression is actually 8:5:1 as you seem to have a hard time believing those numbers. I am sure GMHTP would lie about that article. Its a conspiracy
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Old Mar 10, 2008 | 01:52 PM
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Originally Posted by LS2Camaro
LOL yeah because the raiders are good and have won like once in what the last 10 years . Did I need the FAST to go that fast? No pun intended. No, but do I like the extra capabilities? Yes. When you hit 1000 let me know so I will be sure and not to be around as your engine goes BOOM!!! Stock AC here as well, and the point? Seems this thread has gone off topic talking about what the Raiders never do, but back to the topic, pointing out that a low compression build with RACE gas can yield great numbers. But I guess you have to physically inspect the car to make sure the compression is actually 8:5:1 as you seem to have a hard time believing those numbers. I am sure GMHTP would lie about that article. Its a conspiracy

LOL-come on now-you need to sell me that nice BLACK VIPER and buy an ORANGE one!

I agree threads gone nuts but I'll stick to higher compression and boost-especially with a blower. Now I did dyno a C5 with a TTIX-and until the boost came in it was kind of lazy on the hit.

Next season-where going to OWN YOUR HOUSE!!!!!!
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