i was out racing fri night and i felt a slight power loss, i at 1st thought it was heat soak on the blower so i took it easy after that. on the way home i pulled over to take a **** and on my way back to the car i noticed something on my fender, sure as **** it was oil! so i popped the hood and my dip stick was 3 inches in the air and there was oil every where! i guess thats what i get for spraying a 75 shot (actualy a little less due to low bottle pressure) ontop of a 2.7 pulley i did get a few respectable kills though before she went! a built evo with a white rabbit turbo, i put a solid 1-2 cars on him from a 40 roll and a turbo civic hatch from a 40 roll, i put train lengths on the civic! but anywho it just gives me an excuse to put the 10.5:1 compression pistons in with a new clutch and a few other goodies! just sucks that the car is down for a few weeks and im stuck driving my 11 second camaro to work

 

Aww, we really feel bad for you on that one

Good luck with the high compression pistons. Seeing that type of ass kicking makes me even more certain that I'm going to spray a 75 shot on my car once I have the extra money saved up for replacement pistons.

 

dude that is very high compression. wtf boost u planning on running with that? Im jsut curious.

 

sorry to hear that dude now time to upgrade!

 

lol so you blew your motor on 9:5:1 compression and now you want 10:5:1 or 10:0:1 , sounds like your going backwards

 

No he plans on putting a turbo on it in the near future and that camaro is bad ass hey donny is that the one you have running a 300 shot of nitrous?

 

10.5 pistons = **** on pump gas. Do not go with them... they are a tuning nightmare. and you won't be able to go lower than a 3.0" pulley with out race gas. Stay with the 9.5:1 pistons and you'll be good.

 

Hey have you had some personal experiance with the 10:1 pistons? I was thinking of doing this cause up here at 3500feet above sea level I am only boosting like 17psi with a 2.5" pulley iat 2 get up there by the end of a hard pull (180*f) I would like to run a bigger pulley and have more power, I already can't run much timing as it is on 91 octane we have around hear. It is around 12* on the aeroforce gauge. On my high octane table I am set to 20 but the adders must be taking some out.I get a few degrees of kr hear and there.
That is why I thought run more static compression and increase the pulley size to like a 2.7" . When I do do it I will port the head at the same time.And once these cams are sorted out I might get a set.So Is your recomendation to go with the 10:1 or stick with the stock cr 9.5:1. I only ask cause I don't really feel like doing this job 2 times.I hate working on cars.
Thanks,C

 

I"ve been working with a guy down south (Vman81) and we've been having a bitch of a time getting his car tuned... on 10.0:1 pistons. only made 246whp on a 2.7 pulley on pump gas. Cant run any timing with that kind of compression, and advancing the timing is what makes the power.
stay with the stock compression. Go with some custom ground cams, and def get some head work done. You'll make real good power with that setup. Should be up near the 300whp range once properly tuned

and as for your timing. 20 degrees is a bit high on 91 octane. you were probably getting a **** load of knock in the beginning, but thankfully our cars have a knock learn and split from high octane to low octane tables on their own

 

Sorry to hear that man, time to re-build her the right way now

You should link this into that 8 page long clusterfuck of an argument about running spray ontop of the stg 3 pulley without building up first

 

If you insist on high comp pistons, I would invest into a meth kit as well. Try to up that octane as much as possible.

 

Thank, for the info.
I am sure the IAT offset is pulling tons of timing It is at around 10-13* under full boost.
as for the the cr if it isn't making any mort power with the 10:1 and it is hard to tune.
probably better to run the 9.5 's and spray nitrous .

 

^^^In FI applications it is almost always better to go with stock or lower compression ratios.

 

How do you know that you blew #4? You had blow by...is your car running very rough? Does it sound like a WRX?

lol good point

 

it sounds like a wrx and its running like it has some nasty cams in it but the gas station near me carries 100 octane unleaded and i normaly run it in my cars. im looking at making the most power i can. with the forged coated pistons i should be ok. and i was planning on keeping the 2.7 pulley on it for now.

 

Another one down, maybe people will finally realize that going lower on the pulley doesnt always mean good.

 

^^^exactly not unless you have the money to fix it then hell go for it i know i dont have money to put in to it

 

or you know what you are doing.....

 

x100.

You know our cars can run fine on small pullies. I personally would not go smaller then a 2.7 though. Thats just imo. If you know what your doing and you build the motor right. A 2.7 pulley with the correct other supporting mods along with a very good tune = 300 whp+

 

Too much boost = waste of money and time in our cars (Too much being more boost than your engine is willing to deal with).

I'm not saying anyone should do it but with the 10:1 pistons and customs cams GMP made a little over 300WHP. They were running a dual pass setup and tuned it for the setup.

Honestly I really think that alot of people are underestimating what a good cam setup can do when couple with other supporting mods like valve springs, good exhaust setup, P&P. I could see a LSJ making more power with these kinds of mods at 15psi than a stock setup running 21psi, if it can even keep running at all.

 

What AFR do you see when running a 75 shot and what injectors do you have?
b

 

Ill be running my new setup on 12-15 psi... but thats also through a turbo that flows more than double what the m62 puts out at 20 psi... plus intake temps will be down significantly

 

Precisely.

It just comes down to air flow (CFM) & intake air temperature efficiency.

 

lol... forgot about that dude in your sig adam... **** is funny

 

need f/i and cams in mine after my tune to not go over my dutywith em pistons later on ported head thats my listjsut for the engine not including cooling mods