I wanna go turbo later down the rd? Im about to build up this new 2.4 engine I just picked up with forged internals but I dont have the extra money for a turbo right now.. So whats safe to run NA and for boost later down the rd if I decide to add a turbo? Im guessing 9:5?
What do you guys think?
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ
i wouldnt go any higher than the 9.5 unless your gonna stand alone it
any lower than 9.0 and youll loose power being n/a
but id try to keep the compression between 8.5 to 9.5 , depending on how much boost you want
^^what he said
the advantage of having lower compression is you can run higher boost.
more boost makes the turbo compress most of the air before it gets into the cylidner, therefore the cyilnder doesn't have to compress it as hard to make lots of power. Also, as the air is compressed it heats up. If you compress it too much, it'll start to cause detonation. The charged air from the turbo can be intercooled before it gets to the engine tho, which is why people drop compression and raise boost.
having said that, 9.5:1 is a bit high, so you won't be able to run as much boost safely as the next guy. However, higher compression means better response from the engine... in otherwords, less turbo lag.
So is it safe to say that 9:0 cr will be ok to run NA or boosted right? When I had turbo plans I was gonna run 8:5..
Thanks for the advise guys.
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ
9:1 should be fine
the stock 2200 is 9.1:1 and I plan on running at least 8psi with an overall goal of 10 on stock internals.
like I said you'll have decent response and the added power of a turbo
a turbo car with low compression is very very powerful, but they're sluggish when off the boost for obvious reasons.
9:1 should be perfect balance between throttle response and power vs turbo lag.
Thanks again, my questions have been answered
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD
AUTOMATIC!!
328 HP
306 TQ
just don't forget that you can't run the same octane fuel in at 9:1 compression N/A vs 9:1 compression turbo'd. you're good with 91 right now. but after boost, i'd stick with around 93 for 6 psi and above 6 psi... 104 race fuel.
I was a retard, and now I'm permanently banned.
n/a is good for 87 not not 91 dillweed
i run my 68 elco with 11.0 on 87 , and people have run over 20 psi on 91-93 pump gas
it all on the tune and the rest of the parts you put in it
[quote=97cavie24ls(JDM cav sedan™)]n/a is good for 87 not not 91 dillweed
i run my 68 elco with 11.0 on 87 , and people have run over 20 psi on 91-93 pump gas
it all on the tune and the rest of the parts you put in it
yes but it's not going to be a stock 9:1 compression motor. personally i prefer running better gas. my car is 8.85:1 and it likes 91 QT gas more than it likes anything else. believe me, i've shopped around.
I was a retard, and now I'm permanently banned.
Quote:
Spotabee Racing Online
Today 9:23 PM
just don't forget that you can't run the same octane fuel in at 9:1 compression N/A vs 9:1 compression turbo'd. you're good with 91 right now. but after boost, i'd stick with around 93 for 6 psi and above 6 psi... 104 race fuel.
104 octane race fuel for 7psi of boost?
I call
93 octane (and 94 in some areas where its available at sonoco gas stations) is fine for 10psi of boost.
my friend jay runs 20psi of boost on 94 octane in his turbo beetle. Wanna guess the compression?
9.3:1
sorry i just read over that again. my bad. we don't have sunoco gas stations around here, the best gas you can get that isn't over 92 octane is QuickTrip gas, which is still better than BP 92 octane. I'd run 91 octane for anything up to about 10 psi. After 10 psi I'd go with something better such as Sunoco if it was available, or 100 / 104 from the local airports. But you are right not 7 psi. My bad on that one.
I was a retard, and now I'm permanently banned.
So if its a N/A engine u can only run about 6 psi max. So if i build and engine up and have the compression at either 9.5 or 10.1 the max psi I should run is about 6. Reason is that i could get the engine but it might be awhile before i can boost. I dont want have half and engine and i dont want to go back and change pistons. Even though it might be 2 years max between egine and turbo.
if you are on stock bottom end, then don't run more than 6 psi on stock fuel system unless you have a GOOD GOOD tuning strategy. I've seen people running 14 psi on a stock 2.4 with good tuning. And no you definitely don't want to run 6 psi at 10:1 compression unless again you have a super good tune. That is just asking for trouble. If you run 9.5:1 compression you are fine with both. However, this is 9.5:1 forged internals we are talking about here, not stock GM pistons and rods. You need something that can support the extra power.
I was a retard, and now I'm permanently banned.
alot of people have more than 10psi on the stock motor , nothing touched inside
plain and simple its all about the tune , but if you run a higher octane than needed your loosing power
only reason i use 89 during the summer its over 110 here during the day , and with the a/c on it tends to rattle if i use 87
i wouldnt use 100 or higher unless your well over 10 psi and higher compression , or your unable to change the stock timing values
Quote:
97cavie24ls(JDM cav sedan�)
Today 12:11 AM
plain and simple its all about the tune , but if you run a higher octane than needed your loosing power
all motor, definetly true.
but if you run regular gas when you convert to boost that would be pretty foolish... but hey its your pistons.
I would never EVER run anything but super in my car when I convert to turbo.
I agree, 100 octane is overkill.... but 93 octane is very much required on a turbo charged vehicle... running anything less would be extremely silly.
right i agree with you. a good tune is very very necessary. but that's not a tune you can get from an FMU or most of the time an SAFC for that matter.
I was a retard, and now I'm permanently banned.
Quote:
97cavie24ls(JDM cav sedan™)
Today 12:11 AM
alot of people have more than 10psi on the stock motor , nothing touched inside
plain and simple its all about the tune , but if you run a higher octane than needed your loosing power
only reason i use 89 during the summer its over 110 here during the day , and with the a/c on it tends to rattle if i use 87
i wouldnt use 100 or higher unless your well over 10 psi and higher compression , or your unable to change the stock timing values
my bad you're talking about your other car haha
