Hammer_head

A friend of mine has a 2000 GS-R with stock B18. He is going to install a Drag III turbo kit with intercooler. What head gasket is best? SHouldn't he get one that lowers his CR?

Please give input!

MatT3T4

stock

ImportReview

Buy 2 stock gaskets, and use like 1 layer from the other gasket and the full 3 layers from the first one.

4 layer head gasket.

Or get a cometic like 40k if your worried.

Jeff

ekb18c

edit- No he shouldn't lower his compressiion.


[Modified by ekb18c, 3:27 AM 10/3/2002]

HybridKOOP

LowGSR01

Inline Pro

Andrew 825SM

yep!! boost more!!!!!!!

Hammer_head

Why not? I looked at the Cometic .057 and it should drop the CR to 9.3:1. Why is this not a good thing?

MatT3T4

Is it a street car? Daily driver?

Not needed. Unless you are completely building the motor, keep the stock compression.

At that, lowering compression with a head gasket is kinda halfassy (in my opinion). To each his own though, you can do it, but I would stay stock.

Elite Hatch

You should never want stock compression with a turbo, come on now. Though you say that a lower compression head gasket is "halfassy" I know of many cars that have been running stock motor at about 14lbs of boost with just an Inline Pro headgasket for a LONG time. If they ran that much boost on a stock motor it would blow. If you didnt want lowered compression for a turbo why would people put lower compression pistons in them. WITH A TURBO YOU WANT LOW CoMPRESSION. That is well known, I would just get an Inline headgasket if you dont have the money to build the motor. There are a few cars i know of that ran 10's with that headgasket and alot that have ran 11's on stock motors with just the inline gasket.

MatT3T4

Oh my, it seems as though we haven't met. Greetings, I am the local compression advocate.

You don't need to lower the compression. You can still run your 14lbs. with the stock compression. I, too, know many cars who have run in excess of 14lbs. with stock compression (me being one of them), for years. Head gasket...stock.

SlowTeg

1. You misunderstood what he meant by "halfassy."
2. Low compression is not necessarily "better" than higher compression.

1. Using a headgasket IS "halfassy" because all it does is drop the compression. No one said it couldn't be fast but why not just leave the compression stock and have a much better powerband overall, on less boost? The reason why a motor would blow if they ran 10:1 compression on a stock block is because they're running a stock ecu(which is ghetto as well), which doesn't allow you to pull timing.

2. That's a debatable point, but there are plenty of people out there running 10:1+ CR and it works well for them. There are plenty of cars out there as well that've run 11's on a stock block/no headgasket. Too many think that lowering CR is the magical answer to everything.

-Mike

Elite Hatch

Bottom line. I am not saying lowering your compression makes your car faster. It is just a way to run more boost and save money on pistons. Go ahead use stock motor on your car. But the average person wants to lower compression when they go turbo to help save problems down the road. When someone asks a question about what they should do, I think that for the majority i speak when I say when you go turbo to lower the compression.

By the way what do your cars run?? If the headgasket is so halfassy.

MatT3T4

Run more boost & less compression vs. run less boost and more compression...same peak power, higher (stock) compression...better throughout powerband for a street car.

That's because the majority does not understand the dynamics of compression and boost, and where and when high/low compression is needed, or most useful.

As for what our cars run...? Same times, with less boost.

275Performance

What about the Inline Pro gasket. What's the thoughts on it?

MatT3T4

Good head gasket, but nonetheless...I would rather keep stock compression for a daily driver. Once again, not to take away from the product.

275Performance

Non Daily Driver- Inline Pro VS Comtic VS Stock copper sprayed?

MatT3T4

Built motor vs. stock?

If I were building a full blown race motor, I might consider lowering compression. But, I would probably stick with stock compression, or maybe a bit higher...and utilize methanol injection to keep things cool under high boost. I don't think you can even comprehend the kind of power setups like these make, on such "low" boost settings.

For a street car, daily driver or not, with a stock motor...stock gasket, no question about it...in my preference.

MatT3T4

By the way...my buddy uses methanol on his R33 GT-R, and that **** is sick. We took it out for a spin (hehehhe), running about 22psi on the HKS GT??? turbos, came back, popped the hood, and the valve cover was cool to the touch. Nutty ****...

DSF

I'll throw my hat into the compression ring I'm another advocate of compression. I'll be running 10:1 myself if I ever get the time to assemble the damn thing. One time I would think of lowering compression (on a street vehicle) is when high octane gas isn't readily available. Or if you have no means of adequate tuning. A high compression engine will always make more power than a low compression variant, pound for pound.

Elite Hatch

I totally understand what you all are saying about the car is not going to be faster with lower compression. Just a lot of people out there use stock ecu and with a stock ecu it does help to have lowered compression.

MatT3T4

Most people will run some sort of management though, piggyback at least...V-AFC in most cases. With that, it can be solved, and maybe a little timing retard should it get hot out, or lack octane somewhere. Both ways work, it's just a matter of preference and ability.

ImportReview

We put an inline Pro gasket a customer brought us to put on his car yesterday...

and that thing was 120k thick, or 3 MM's thick.

On a stock GSR motor with a Greddy turbo kit.

I could have sword I calculated the compression to about 8.4:1 after looking at the deck hieght.

And it must have been that low because the car ran SO rich, I had to turn down the fuel a great deal.

I think the head gaskets are ok, but I think you have to go ARP head studs with them with a tighter torque to make them stand up better.

I am going to boost like 12 PSI on the stock motor next week, we will see how it goes.

Jeff

MatT3T4

holy crap.

PS
I received the brochure, thank you. We are interested, and I will contact you further soon.

ImportReview

Yeah dude. I pulled out the INline Pro gasket

and it was:

3 MM THICK!

I couldn't believe it! I was like WOAH!

I was afraid the head studs were going to strip going back in the block because 3 MM more of thread are not grabbing.

Thats why I think ARP is the only way to go on those gaskets.

The gasket was like $300 also.

We will see how it goes on the dyno next week.

Jeff