the man with all the answers. so what race team do u work for??? lets see some of your work before u just start telling everyone what to do.

 

damn yall chill out..

seems like there has been alot of hate going on here these days.

dude does have a valid point and the theory is sound, but how much it matters for a street car.. not so much

 

The piston is not in TDC when ignition is initiated. I.e. 20 degrees of advanced ignition means that the piston is 3.5mm from TDC with your AP2 parts dimensions (rod lenght and stroke).

 

Thanks for backin me up. People like touge master never seem to take any time and look around. If so he would see some of my builds that are on here. And my thread about my shop. But hey, assumption is easier right.. me..... i dont know squat.

Wadzii, dynamic carries the same importance on a street motor, as on a race motor. They are one in the same in my book. You either know what your doing and build for longevity and power that lives, or you dont know and you build carefully and blame the breakage on "race motors".
Its 6 of one and half a dozen of the other. What you just said is... run more boost with less compression and that fixes it. Or,,, its more capable of doing so.
This is the same as, running higher compression, and less boost.
They make the same horsepower, with the higher CR motor making more torque, having better driveability and burning cleaner.
Its all about the tuner.
One team will have a setup this way, another team another way. yet they both run the same times.
So like i said before, every chef has a different recipe for the same dish.
I try and be on the leading edge of tech and know whats going on. I also understand engine dynamics very well, and am quite harsh on thinking from days gone by.
When something has been proven to be wrong without any doubt, i will argue that point until it is clear.
Im not trying to be a dick at all, just making it clear that you MUST match the static and dynamic WITH the camshafts for every build.
SO taking the s2k as it is stock, and changing the static CR 2 points WITH the stock cams, is bad no matter how you explain it. There is no way to make it look good.
So like i said. (all things in moderation).
IF your a bit scurred, and going to drop it, just drop it 1 point. It will still drive OK, tune for driveability OK, and youd have to be a dolt to blow it up with the big cams engaged.
problem with what i just said is, tuners.
90% of guys who say they are "tuners" arent.
They tune for WOT only and have no clue about anything else.
They go to an aem class and now they are a tuner....
I will admit, i havent been to any classes to push on the keyboard.
I am busy enough tuning carbureted cars and nitrous setups. I understand every bit of whats going on, im just not well versed enough in the different managements to start key stroking the big HP builds.
I have a guy who tunes for me because i cant afford to have any mistakes, and i dont want blown up shit on my resume.

whew...long winded post. LOL.
I enjoy tech stuff, and explaining it correctly is also fun. So i can get a bit windy at times.

 

Your on methanol?
WHO told you to drop your CR?
You should have left it alone altogether.
I mean, your making sick numbers with your setup no doubt. But alk likes more pressure.
So you could either make a ton more hp at the boost your at, with a point or so more CR, or you could run less boost and make the same HP.
But for sure, meth likes pressure, it burns so damn cold.

Funny story. I build a lot of aircooled engines. I remember the first time i went to the dunes and saw a meth'd vw motor.
They have cooling metal all over them to direct air and keep them cool.
This guy had NONE. I was blown away and started chewing him up and down (was just a kid) he listened, and listened... and when i was done he says...
It runs on meth kid.... feel the heads.
They were barely warm, and it had been running the entire time i was there.
I was blown away... LOL.

 

eh.. i have rebuilt motors changing nothing but the pistons.. going up and down compression ratios..

there was never any real quantifiable difference other than the lower compression motors could make more power assuming you werent already at the limits of the turbo.

on the 3 400hp 2 liter b-series engines I have rebuilt just to lower the compression we have actually picked up power at the same boost when using pump gas... then we were able to get another 75hp out of it w/o running out of octane.

now on the 1.8 liter motor in the race car at the shop i used to work at.. we were able to make more power with higher compression. The turbo was maxed and we had c16.


Its very easy to see the dynamic vs static compression on an NA motor.

13:1 motors will live a long time provided they have a big cam, put a little cam in it.. you'll toast it in a week.

Siadam is running meth injection.. not straight meth. he wants a million hp on pump gas.. lol


I know what you are saying and i dont disagree with it. Building it the way you say will always work "better".......... Until something bad happens. A low compression motor will live, a high compression motor wont.

there are alot of variables in pump gas and air quality. Most people want to build it and forget about it. You cant do that with high compression.

 

OH didnt know siadam was on meth "injection".
i thought he was on straight meth. lol

 

This is true. Like i said, im a bit spoiled when it comes to tuner.
You can get away with a lot more with low CR.

 

I have been tuning professionally for a long time.. I have seen it all and most of the time I build to the lowest common denominator... haha

 

Yeah. That covers the stupidity of alot of clients. And CYA for you.
But, you have to admit with all the failsafes in the management you can CYA easily anyways.
Making sure if IAT gets too high you pull timing and add fuel. Same with coolant temps, etc.
But like i said, most tuners cry because they arent payed to set all that, and work the driveability.
So what the world ends up with is a bunch of WOT only tuned cars, masked with low compression to keep the engine alive, and the tuner out of court...lol.