no need to edit ur post man. I completely agree throw a 2.5 on that setup haha.

 

ehh thought it over, while the 2.5 would be nice hes running a very high compression. to be hitting 20+ PSI.

 

315 currently i plan to do cams in the near future and alot more tuning, my tuner says more can be pulled out of it for power it just going to take some good tuning time

yes it is really nice, tuning wasnt that hard just takes lot of time

im good with the pulley size im running now im boosting 19lbs im content with that, plus any smaller pulley than 2.7 im over reving my supercharger, and i have 10.5:1 compression that small of a pulley could be an accident wainting to happen... i will have to go back up in pulley when i put a tvs on in fall/winter

 

You don't have to go 10:5:1 to go big or go home.. I plan on going big as well, but not with that :P Everyones different.. I was just curious and was expecting a better response than ... Go big or go home and ... Why not.. Lol

The last person that went 10:5:1 and tried pushing big boost and big power numbers destroyed his sleeves on Forged Internals and Ported head.. Thats why I was asking.

 

ok here better more compression = more power i wanted for sure 300hp numbers with the m62 and i wanted to have a simular setup as the time attack cobalt

 

So you just want around 300whp? Any higher and with that CR its going to start creating some serious problems. IMO. Not trying to bash and be a big doucher, just chatting and seeing where your wanting to go etc.. As if you have any other plans AFTER this.. Persay, Turbo or TVS...

 

i plan to do cams in the near future and tvs come next fall winter and that going to be calling it quits after that.

 

now not trying to be a douche or call you out, but how much do you really know or experience do you have with high compression motors and large boost numbers? What kind of facts/knowledge do you have to back up your claims?

While higher compression can be a bit riskier when it comes to blowing an engine, its not something you can really just say on a whim that its going to start creating some serious problems. There is nothing wrong with high compression/high HP/high boost as long as the tune is right and engine is built right.

 

Be careful on the TVS with that CR and don't try pushing huge boost with it. But I want to see what this build does on an M62 as I think it will suprise a lot of people at your numbers :P

 

ill be ok with that compresion ratio with my current setup and more tuning, i do hear you saying where i would run into problem im already looked into that, so for if i go with the tvs in the fall i will have to run the stock pulley if come with it i wont be able to run a smaller pulley on it like some people do, do to the higher compression in my motor, and i know your not trying to be a douch or dick and never took it as you were your just looking out and thanks much.

very true, i'll only be able to run 15-17lbs max if i do the tvs casue of the CR

with everything thats done to it now, i plan to do cams soon and more tuning my goal is 340hp and my tuner says it possable, it just going to take some tunning time

 

I've always heard and been taught that Boosted cars that are wanting to push some serious boost/power do not want to go with a high Compression Ratio. I've also seen on here that a lot of guys going turbo go with a 8:5:1 or the stock 9:5:1 and some TVS guys are running a 10:1, but most that are DD'ing there car want stock CR.. I have NEVER had a High CR car and if I am totally wrong please correct me.. If he hasn't already bought these Pistons now would be a good time to talk it and if its wrong he may change his mind or if he won't like it..

 

There is nothing wrong with running the same PSI with the TVS as he is running with the M62. 20 PSI from a TVS is the same airflow CFM as 20 PSI from an M62. PSI is only a measure of resistance, not airflow CFM! Only difference is the TVS air will be cooler and took less energy to create. Which means there will be slightly more air per PSI, but only the difference amount of temperate change, not because of anything else. So its only a minor difference.

Higher compression is harder to handle but the gains are much more worth it, there is nothing wrong with it, just less room for error. People lower the compression because there engines are not built to handle the higher compression and they want to run higher boost numbers.

 

I'm not talking about 20psi on the TVS.. I was speaking if he was trying for Higher numbers.. A guy on this site was running 10:5:1 on the 2.75 pulley on the tvs and blew her up due to KR.

A lot of guys do not run that high of CR.. I'm just telling him to be careful with it.. You're borderline Douchey/Arrogant.. I'm not acting like a know it all or anything all I'm saying is be careful with that high of a CR.

 

usally people go with lower CR for high boosting high powered cars, i just wanted to be different and try something diferent and not be like everyone else or do what everyone else does you know, i look at it this way this is an example i your car runs 9.5:1 compression on 15lbs boost makes 220. example
now my car 10.5:1 compression because of the higher compression i wouldnt have to run 15lbs of boost to make the same hp i can run less boost and make the same power theres no benifit from him i just wanted to be different

 

Yes, you can make more power and more torque than a lower CR and I'm not opposing your build or people that go with a High Compression.. I was simply asking questions.

 

i know im just trying to explain why i did it, i that was more what you were looking for

 

No its fine and I want to see numbers from it as I was going to do a M62 build myself, but got the TVS so I'm going ahead and working around that since I already blew #4 and in the process of placing it.

 

sorry to hear about your blown engine, atleast you got an excuse to build it better now.

And also, i really think that 90% of the blown engines in this forum are due to canned improper tunes or kids modding there cars and not having enough knowledge about them. I know pleanty of people who have been running 2.5s for over a year with no problems, and i know dumb kids who blew them up in a week with them. I know people who have had 400WHP on a stock engine and didnt have any problems, and others who blow it up with a 2.7.

Higher compression is the way to go if you want real power. Its only dangerous if you dont know what your doing.

 

i had no choice other than to build mine casue i blew piston #4 and part of the cylinder got over in to #3 damaged that one to and my motor was toast and burnd up it was completely stock at the time too. yeah i will post up dyno sheets after i get the cams and get more tuning time.

 

I know of one guy who says he's hitting 306 fwhp. I haven't seen any dyno sheets but I have ridden in his car after he did what he did to it and it feels quicker than mine and he was only at ~3/4 throttle. So possibly but like I said. I have not seen any dyno sheets or anything.

 

thats why my car when up in flames i thougt the first person that was tuning my car knew what he was doing. yeah i was wrong, im very proud of the person tuning my car currently.
hey it was a good excuse for me to build my motor im not complaining other than it wasnt on my terms...

i cant wait to get the tuning done thou you know lol....my wife dieing to see whos car is faster mine or hers lol

 

I'm far from a dumb kid and have owned 11 second cars before and my Tune was perfectly fine, but it was error by me as I ran out of meth mid pull and pop.. **** happens so now I have to fix my mistake. A lot of it has to do with tune and some to do with the car :P

I don't know about the bolded statement, but thats just my opinion and I don't agree with you entirely. You can only get so much power out of 20 psi on a High CR car.. Once you hit that limit and mod and tune for that.. You're going to want to up the boost and once you do that you may have to start pulling a lot of timing so the car doesn't start Knocking.

 

the cams will drop your CR anyway onecoldbiz

 

ahh ok i didnt know that. bearly thou right...?

 

how do cams lower compression?