ninetres

iTrader: (35)

My car sees more street duty than track.

Websy21

iTrader: (34)

You running a 346? Checked out your build and video, bad *** bro. Car sounds and looks awesome. What CR did you go with?

red83

iTrader: (64)

my car is 98% race only, but its going to be mean as hell on the streets!

viper2fast

ninetres

iTrader: (35)

When I had that cam in I was at 364 cubes and 8.5:1cr. My current build is going to be 370ci and ~9.2cr with the same cam.

Websy21

iTrader: (34)

How come you are uping the CR? Did you not like the 8.5?

edit - I'm only curious b/c I am jsut having second thoughts b/c my builder has other pistons that would up my CR to a hair over 9.3. I think that this MIGHT be better for me b/c I don't plan on running a **** load of boost and going to the track to really test it out that much. If I'm on the street 99% of the time, wouldn't I be better off with a little higher CR and less boost. Better efficiency, more power on less boost and better off boost power as well. Even better milleage too, lol What do ya think, I'll be a 370 too with pump and meth?

ninetres

iTrader: (35)

I am adding nice dual nozzle meth kit to this build so it will allow for a little more compression and hopefully a couple more degrees of timing. The cam is BIG so gas millage SUCKED at 8.5:1. Granted it won't make much of a difference, but it will help spool the turbo and off boost power.

I am also planning on running it at a conservative 10psi. My car sees lots of street "duty" so I can't use 900rwhp.

Websy21

iTrader: (34)

I think you just missed my edit, but you pretty much adressed my concerns. This too is what I am thinking, I am pretty much a full street car. Not allot of miles or DD, but I don't have a track that close and make it there often at all.

edit - So with your old setup you never had meth than? What did you boost it to at the norm? I know meth helps allot and think I'd be better off half a point higher CR. What ya think? I know it will make tons either way, but why not make it a better overall build right.

ninetres

iTrader: (35)

I like the idea of higher compression. I also looked at my buddy's turbo SS (Mr_president) to make my decision to raise it. He was on a stock bottom end with LQ9 heads so figure his CR to be around what......9.5:1. He ran a T76gts with a .96 housing and his car spooled INSTANTLY upon WOT. He had a VERY small reverse split camotion grind cam too btw....and 10.20s on 9psi.

Websy21

iTrader: (34)

Dammit, just when I think I got it figured out. Ya I know which guy you are referring too. With my stock L92 heads on a 370 and -5cc dished pistons I'd be at 9.33:1, so pretty close to him. I got the 80gts with a .96 a/r, so again close other than the cam. With an auto too I guess a guy should have allto better spooling than the M6 guys at any time. I might just have to call him up, hopefully he hasn't swapped the pistons yet but I am sure the new cranks not in yet, lol

I like your thinking, say since we'll be close in comparison and being you have allot more experience than me. How much boost you think I can run on pump and meth without a worry with 9.3? 10-12 is what I am thining? 10 should be a joke for it not? Like you said, faster spool, more power and there is only so much you can actually use on the street anyhow.

ninetres

iTrader: (35)

9.3 and 12 psi should be no prob with methanol IMO.

Websy21

iTrader: (34)

Damn at work right now and just logged on, good timing, lol

Ya I agree, 9.3CR and 12psi with meth no prob. Many run 8-10 on stock 10:1 CR but I think 10 is pushing it. I'm really torn b/w this b/c both would be beneficial in both ways. With pump gas and even meth I won't be able to achieve the most out of the setup. If I go with the 8.7 I should be able to make hell of allot more power and I don't plan on ever using race gas b/c I don't go to the track much at all.

I wish I was as fortunate as you and could go for a rip in both cars and decide on what 'I' want as its personal preference. Even so though, theres a difference if the whole combination of things are setup right. Even 8.7 CR with the right, cam, converter, gears, tuning etc should be a blast to drive. I know that 9.3 would be even better though, lol I guess if I look at it that way, with the 9.3 and say for example 12psi or so(max with pump/meth) it should make a solid 650-700rwhp which would take about 15psi or a lil better on the lower CR. Both are more than enough for the street regardless, take your pick on whats better for you? The 8.7 would also have the added feature of a safer combo(detonation) as well wether or not it would be chosen to run higher boost in the future.

ninetres

iTrader: (35)

The tune just becomes more important if you run a higher CR and decent boost. I have a TON of confidence in Rick at Synergy who tunes my car. I believe I have heard that he prefers ~8.7--8.9 or so........but that's just hearsay. Go with 9.3. I just don't see a reason why you need to go any lower than that on pump/meth and 10 or 12 psi.

Websy21

iTrader: (34)

Ya I agree if 12 psi was the max but I guess power output is more than goal. If I ever decide that the power isn't enough than I'd need to step up my octane and tune and monitor it allot closer. With the lower CR its more forgiving and user friendly for the street in respect to boost setting persay. without ordering new pistons I think that I'd shoot for dead on 9:1 if I did it again but I have spend enough money. Aside to all, guys what do you think my given combo with 9.3CR and 12 psi or so would make? Thats more the concern here anyways. I would like the most out of pump for the street that is somewhat USEABLE

Websy21

iTrader: (34)

Well, I guess I ate my own words. Why not get what ya want. I am gonna order some diamond -10cc dished pistons which will yield me a hair under 8.9 CR. So I think that this will be best of both worlds for what I want and can still turn up the boost fairly relative with the meth.

I am also leaning towards the 228/232 cam as well, if not the 224/228 maybe. Any other opinions?

Mr.MartyStone

iTrader: (12)

Run the 228/232, it will be fine.

Websy21

iTrader: (34)

Thanks, so far thats what is sliding in the 370. For what it takes gonna talk to a shop that custom grinds(Sponsor on here) and see what they say.

Thanks - Mike

Websy21

iTrader: (34)

You can say it, I am worse than a women. I just changed the order for -15cc diamond pistons that will give me exactly 8.5:1 CR. This will enable me to boost up to 20psi with pump gas. I also plan on not using the meth unless I go to the track and turn it up, either that or I will have it come on with a mist.

To help with the power down low, I am leaning towards the smallest cam which will also help to spool the turbo up even though it shouldn't be no hell to start with

Mr.MartyStone

iTrader: (12)

Yeah I was shooting for 9.5:1 because of the 12 degrees of overlap on my cam, but a deal came up on a used set of boost specific pistons so it's more like 8.6:1 now. So instead of 13-15 I'll try and eek out around 20 w/ meth and blowup my rearend on the first pass. I'm just goin to put my 233/239 on a 108 ICL and it should be fine. All of the answers I got said it would work nicely.

I would still run the 228/232 or the 232/240 for your car and let her rip. Your 80mm is on a T4 flange w/ smallish a/r correct? I know you posted in the first page but I'm the epitomy of lazy

Websy21

iTrader: (34)

LOL, ya its a t80gts t4 flange with a 3'' downpipe but will have cutout. The only reason I am thinking the 224/228 is to make up for the lower cr power down low and help spool the turbo. More friendly on the street, its not a race car and hardly make it to the track......... well so far, might change after this is done but still have to find the time when the closest track is 2.5 hours away.

Trust me I really want to tell my builder to throw in the 228/232 believe me. (Its the biggest I'll go for sure) Not only for power etc, but for some lope at idle. I love the sound of overlap in a late model sports car, little alone any vehicle.

Good choice on CR, the more shops I talked to the more reccommended b/w 8.5-8.8 CR. So I think thats the best. Max power by far with pump gas, add a meth kit and go even farther. Just don't rely on it. Like I said I prolly won't use it unless I really let the boost rip.