Compression???

[dougs90gsx]

Just wondering what everyones thoughts were on a 10-1 compression??? Any good things and/or bad ones will be noted for further building... Thanx

[v413nc3]

uhm, it limits your boost levels... or rather, ups your octane requirements.

[dougs90gsx]

So like 8:5:1 is what is good for these cars then or 9:1

[v413nc3]

What boost levels are you gonna run @ what octane gas?

[dougs90gsx]

Well I am going to run as much boost as possilbe:D with a red to the best efficency with 91 probably so it would be smarter to stay with a lower ummm compression huh:rolleyes:

[v413nc3]

Hal and Dave are probably best suited for this answer, but if it were me I would go with 8.5:1

[V8SpankR]

8.5 seems to be ideal and that's what Dave has using 2nd gen pistons.

[v413nc3]

I'm hoping to run over 35psi on an L3R I placed the order today for my ross pistons that are going into the stroker we're doing when the parts come in.... 8.5:1 CR...

[dougs90gsx]

Thats is going to be awesome. Are you going to run anywhere other than up there in Colorado or are you going to run like somewhere near sea level?

[v413nc3]

well, if I can get Mandy off her butt, I think we'll go run in cali and other places... why?

[erik]

I chose to go with 9.0:1 because of three reasons. :One- the elevation up here inherently causes compression ratios to be a little lower than what it's like at lower elevations. :Two- I'm going with a thicker head gasket. However, I might have the engine decked a lil lower because of it. But either way I will likely have less compression because of it. :Three- I am more willing to sacrifice total high end power for the benefits of low end power that our cars usually suffer from. It's a daily driver more often than not. And I love to take it in the turns at 2nd creek. :)
My needs are likely different than some of you guys. I also am planning on keeping my (what some would conceder small) I.C. and turbo combo, too.
I'm so excided to get this together. But things are to soon to tell whether or not this will be all worth it.

[v413nc3]

all good reasons... but for wanting to run extremely (28psi+) high boost it's always good to err on the safe side, that and w/ the AWD the launch takes care of the low end torque problems, I guess it's all in how you want to use the car...

[erik]

A lower level of boost is likely 'v413nc3'. However, I have come to realize that some even concider 10.0:1 here in Colorado. John Shephard thought so. But I explained that I'm more interested in the low end advantage with higher boost; than lower boost with high octane ALL of the time. If you are a drag racer like John then you would want as much power as possible made for the car reguardless. And the AWD 'feature' of the car is about transmission of that power to the ground not a power advantage.
- - I'm not looking for 650WHP out for the car. Maybe 450WHP. I just want a lil fun with it. With the 0-100-0 and the turns. If I have to loose a lil boost (28psi for 22psi) then so be it. It's a great compromise since cold, high volumes of A/F flow is much more important than max boost any day. I think.
- -Additionally, these Ross pistons will be Black Anodized coated to deduce detonation. And after the breakin period I will plan on putting in my water injection sys. for daily use just for a plus. I think that aught to keep things a lil cooler in the summer.

[v413nc3]

Wow, didn't someone piss in YOUR wheaties, I made the comment in regards to the ORIGIONAL question. And I never put down your point. THE TRACTION was the point anyway, and the fact that when we really want the power, we launch so that we're in our boost range anyway. Nifty thing that launch feature with those AWD's.... I believe the origional post was about producing "as much boost as possible" I'm sorry if I gave advice to err on the SAFE side of things, especially since I've seen a couple of blown pistons in my day, so sorry for stepping on your all amazing toes there. If you'll take a chance to RE-READ what I wrote back, you'll notice that I said you made very valid points and that the compression ratio that anyone decides to run really should be based off of how they want to drive their car, and I never once attacked your points. So how about you remove your stick before you talk to me again. Oh, and do have a nice day :)

[erik]

now, now. I never took your comment negative. Nothing as per taken and nun intentionally given. .. It's hard to hear "tone of voice" in text. You made your point more clear now. No need to get huffy about it.
Debate can be a proactive event. I welcome you to excercize it sometime. That is how we brainstorm..No?
it was said earlier..."Just wondering what everyones thoughts were on a 10-1 compression??? Any good things and/or bad ones.."
that was my take on this thred.



Originally posted by v413nc3
Wow, didn't someone piss in YOUR wheaties,..."::confused:

[v413nc3]

Tone of voice comes through clearly, and I took yours wrong apparently with the use of the handle I like to use in quotation. If I misunderstood you I do apologize. I wasn't really stating points in counter argument to yours, which were good. The reason I origionally asked him what boost levels he wanted to run was so that I could get an idea of what kind of advice to give him. He has made a few posts about running either an L3R or a FP red, which IMHO I believe that it would be safest to err on the low side of CR and go with 8.5:1...

[erik]

agreed. And in my scenario I'll be using a less potent turbo the 18g. These two scenarios are both, I believe, very effective in there own way. He will have a higher trap speed and possibly a lower E.T. and I'll have possibly better throttle response and a slower Mph. But the E.T. may likely be similar. That always depends on transmission and driver's skills anyway.

[v413nc3]

Very true... I may run mine out at Bandi just to see what she'll do when were done. I'm just not a fan of the 1/4 though... I talked to AGP today and they claim 78% efficiancy @35psi @9000rpm on the turbo.... we'll see

[erik]

I've originally caught the speed bug at Bandi. But now I've grown more tired of it and prefer the turns. I still like draggin' a lil, now and then. But now I am starting to frequent 2nd creek. If you have tried this yet, you know what i mean by funnn! 20minutes Vs. 13sec. or less.
erik :)

[v413nc3]

It's a greater test of skill IMHO of not only driving but building and tuning also... it's hard to make the car do many things (turn well, brake well, accelerate well) than it is to just do 1 thing...

[dougs90gsx]

Yeah I don't need anymore tests thank you for all the coments