How many lbs of boost and gasket thickness?
01-12-2014, 12:59 PM
#1
How many lbs of boost and gasket thickness? I am a noob to FI. But I've read a decent amount to better understand FI for some years now. Its 97 LT1 M6. I know the gurus here are going to lay it on me, so here it goes: I ran across a unbelievable deal on craigslist. Its a new garrett 70mm turbo with all the new plumbling, intercooler etc for dirt cheap. My question is how many lbs of boost should I run?
Now, the thing is the motor was built for NA, but when I asked about CR last year many of you said that my CR was too low and just keep it that way til im ready to boost. Well, I think the time has come. This is my first turbo setup and I have a good understanding of turbos and how they work.
The motor is still on the engine stand out of the car. My CR currently is 10:8, with the thickest non-copper gasket I can get around 10:2 CR. Now they do have a copper gasket thats .080 thick and that would put me around 9:89 CR but I've heard from many people that copper gaskets will leak quicker and re-torquing them down would be b**** in a 97 T/A. My other question is will a .066 head gasket kill my quench? Or is it not as important as NA?
My current cam has a 110 LSA and I am trying to find something with at least a 114 LSA and I can get my ECU retuned for free. There are just some technical things that I do not know that maybe yall can help me out with. What do you think?
Now, the thing is the motor was built for NA, but when I asked about CR last year many of you said that my CR was too low and just keep it that way til im ready to boost. Well, I think the time has come. This is my first turbo setup and I have a good understanding of turbos and how they work.
The motor is still on the engine stand out of the car. My CR currently is 10:8, with the thickest non-copper gasket I can get around 10:2 CR. Now they do have a copper gasket thats .080 thick and that would put me around 9:89 CR but I've heard from many people that copper gaskets will leak quicker and re-torquing them down would be b**** in a 97 T/A. My other question is will a .066 head gasket kill my quench? Or is it not as important as NA?
My current cam has a 110 LSA and I am trying to find something with at least a 114 LSA and I can get my ECU retuned for free. There are just some technical things that I do not know that maybe yall can help me out with. What do you think?
01-13-2014, 02:32 AM
#6
On E85 you could probably leave your compression as it is and boost 8-10psi without issue (with intercooler). On 93 you would really want to get under 10:1. Preferably under 9.5 and using a REALLY thich gasket is a really bad bandaid. New pistons or bigger chambered heads are really a must.
Quench doesn't really matter for FI. It's a min max thing for N/A to get the mixture to burn better.
Your current cam will bleed of a lot of boost with 30* of overlap.
Quench doesn't really matter for FI. It's a min max thing for N/A to get the mixture to burn better.
Your current cam will bleed of a lot of boost with 30* of overlap.
01-13-2014, 08:09 AM
#7
On 93 you would really want to get under 10:1. Preferably under 9.5 and using a REALLY thich gasket is a really bad bandaid. New pistons or bigger chambered heads are really a must.
Quench doesn't really matter for FI. It's a min max thing for N/A to get the mixture to burn better.
Quench doesn't really matter for FI. It's a min max thing for N/A to get the mixture to burn better.
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01-13-2014, 01:41 PM
#9
You have in your sig TFS 215 heads. Did you port them? Trickflow doesn't make an out the box LT1 215cc head except for a SBC and an LS1
Last edited by 87silverbullet; 01-13-2014 at 01:51 PM.
01-14-2014, 07:09 AM
#13
Wow........ Almost 11:1 and 17psi??? Thats great! I will be running E85 as well. Now, how much RWHP were you putting down? Im thinking with 10:6 I could get away with 14lbs but that is with not pressing my luck too hard and tune the s*** out of it.
01-14-2014, 07:13 AM
#14
Yep that is a easy problem solved but, I dont have the time to wait around to see who's going to purchase my heads. Nor spend the money trying to purchase new 1's. I would get the heads CC'd out to bout 62CC if that was the case but time is the issue here. New turbo cam already on the way.....
01-15-2014, 05:47 PM
#15
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Well if you're gonna pull the heads to have them CC'd out that's time and money as well. I don't think you'd have much of a problem selling the heads you have as long as you price them reasonably. Or just keep the compression where it's at and run E85. Good luck either way bro...