10:1 Compression, Too High to Turbo?
 

I got a Ford Probe with a 2.5 klze in it, everyone on the probe forums seem to think its too high of compression and would blow.

Has anyone Done it ( homemade style) successfully, what psi did it hold, how long did it last

Re: 10:1 Compression, Too High to Turbo?
 

about as long as i did with your Mami :D
J\p


That seems ok....my B16 is up in the 10.1 somethin like that and will hold 10 psi with a tune....
you should be good

I never fucked with a probe b4 though so Im not too sure :X

Re: 10:1 Compression, Too High to Turbo?
 

You should be fine. It just lies in the tune. Look at the compression ratios of alot of honda engines that people boost with good results.

Re: 10:1 Compression, Too High to Turbo?
 

i've been DD'ing a y7/y8 mini me (10:1 compression) with a wrx turbo at 10lbs self tuned for 2 years now. i do have some detonation issues though and have had to pull more timing than normal.

its definitly doable and with a great tune would be minty. with a self tune you might run into life-term issues after a while. i just need to survive long enough to get some vitara's in :-P

-Luke

Re: 10:1 Compression, Too High to Turbo?
 

What exactly do they say will "blow" on the engine? The headgasket? Pistons? Things break for a reason. Tune plays into it alot. Detonation and spikes in cylinder pressures "blow" engines. Avoid both with proper intercooling and fuel/ignition tuning.

Re: 10:1 Compression, Too High to Turbo?
 

Well as ive been reading they say theres no chips or anything for the probe gt, there is a chip but its not tuneable

so as for fuel i would have to get some kind of fmu, fuel pump, and i guess injectors

Re: 10:1 Compression, Too High to Turbo?
 

Well if thats the case have fun blowing it to pieces. Post pics when said event occurs.

Megasquirt nignog. www.diyautotune.com

Re: 10:1 Compression, Too High to Turbo?
 

learn from other people's mistake, do your self a favor and please stay the ---- away from the FMU.

Re: 10:1 Compression, Too High to Turbo?
 

the s2000 has 11:1 and people turbo them ;)

Re: 10:1 Compression, Too High to Turbo?
 

Megasquirt FTMFW.

Re: 10:1 Compression, Too High to Turbo?
 

My Q45 has 10.2:1 compression and it's working well so far. I'm only at 3.6 psi but plan to take it to 8 psi. Go for it!

Re: 10:1 Compression, Too High to Turbo?
 

I run 21.5:1 with 12psi of boost on my OM617 ;D. ( However its a diesel )

Re: 10:1 Compression, Too High to Turbo?
 

The new Evo's has a 11-1 compression ratio! but a Magical feul managment system that keeps them in the game....

Re: 10:1 Compression, Too High to Turbo?
 

i'm guessing that that would be direct injection, and thus its not even comparable at all. NA DI engines routinely go to 13:1 because of the way the fuel is layered in the chamber and only introduced when its needed.

i say go for it. there are a lot of pussies and weak minded fuckers on there like "copex". if its tuned right WITH A MEGASQUIRT or similar, it will be hunky dory. i've never heard of one being blown on that boost that didnt crack/melt a piston. if the rods are like the kl-de though, you might have some issues with bendage if you push it past 10psi. they are pencil thin, not sure about the kl-ze rods.

Re: 10:1 Compression, Too High to Turbo?
 

Im pretty sure HP twists rods not PSI.

Re: 10:1 Compression, Too High to Turbo?
 

torque bends rods, psi generates torque. for that matter psi generates hp too, but its the torque that matters. revving high for more hp will end up not with a bent rod, but with one through the side of the block with no cap and broken bolt(s).

Re: 10:1 Compression, Too High to Turbo?
 

just watch out...probes like to blow transmissions

Re: 10:1 Compression, Too High to Turbo?
 

Ok so Im not being a dick here honestly but if this is the case lets say I have a bone stock D series. If what your saying is true then I should be worried about running 25 PSI in a little T25 but Id be just fine with 12 PSI from a 60-1?

Im not arguing your theroy cause I cant. I fix PC's not Cars. this is just something I love doing and learning more about.

Re: 10:1 Compression, Too High to Turbo?
 

I hate it when people argue on the basis of assumption and misinterpretation. He told him that with his specific turbo on his specific engine at his specific CR to not go past a certain PSI or he will have problems. A T25 and a 60-1 have nothing to do with this pointless argument.

Re: 10:1 Compression, Too High to Turbo?
 

My 1st ever turbo car was a 1983 Saab 900T and it was 10:1 CR. I ran a Garrett T3 at over 1 bar and it did just fine for over 150k miles. I sold it, and to my knowledge it's still running strong with over 500k miles on the original motor and tranny at almost 16psi which is easily 200whp. Gotta respek dem old Swedish beasts. Sure they look like turtles, but have a closed deck iron block ftw.

After all the reason turbocharging is so rampant nowadays is because of Saab ( mid 70's OG 99 w/ 2.0L 8V turbo). You don't need a standalone for them either. Easy as hell to chip the Bosch (Jetronic? Motronic?) computer.

Re: 10:1 Compression, Too High to Turbo?
 

true, but if driven nicely you can make them last better. rebel puts down 400 whp through the same box. granted, he changes them every 3000 miles or so, but he still puts it down. putting down 250hp -300hp or so is doable.

Re: 10:1 Compression, Too High to Turbo?
 

no way. rebel doesnt eat up gearboxs every 3000 miles. he's too lazy to do anything on his cars these days haha

but the stock KL rods usually go out around 400-450hp. brandon is replacing motors every 6 months cause he keeps bending rods

Re: 10:1 Compression, Too High to Turbo?
 

yeah, because he cant help but turn up the boost to 15psi which generates sufficient torque to bend them :-)

i try coaching him to just turn it down, but i think hes addicted. maybe the alcy from his tank is somehow making it into the cabin of the turtle when the boost is high? ;-)