Am i safe with a stock boosted JDM b18C, are the compressions the same as the 96 spec jdm b18c to the usdm 98 spec 11.5:1? anyways

JDM b18C w/ 20k miles on it
t3/t4 60-1
RC 750cc injectors
255lph fuel pump

Is 8psi a safe bet? i know its all in the tune and there a respectable shop i am going to but its going to be my daily driver and I dont want it to go boom!

Let me kno!

 

id go 5 psi cuz your compession is too high. just make sure u get a good dyno tune. if u go 8psi make sure u get arps, heatshield im gasket, and water methanol to be extra safe.

 

IIRC jdm=11.1
usdm=10.5

 

Should be fine up to atleast 10 psi with a proper tune. What management are you using to tune? Im sure the jdm b18c is 11:1 not 11:5.... I seen people boost in the 10:5 to 11:1 with no problem BUT with a proper TUNE! Cheapest way for you to boost safer is getting a thicker head gasket($100) and arp head bolts($100). That will atleast put you back in the 10:5 range for a more safe zone. GL

 

People Turbo charge b18b1 engines with lots of boost, without any issues due to the crappy low compression those engines have. since you have the 96 jdm spec engine you'll be risking it. at least put ARP rod bolts, ARP head studs and a head gasket specifically for boost.

 

somewhere around 300-350whp or before knock is detected. if you're doing a pump gas tune with a 60-1 you'll probably be happy in the 8-10psi range

 

Like you said, it's all in the tune. People say it's "better" to boost a low compression car, but in reality, a higher compression boosted car will make more power then a low compression boosted car. The reason lower compression is better is because it is easier to tune and the engine is more "forgiving." As long as you get a good tuner, you will be fine with your compression ratio. I would highly recommend spending money on a reputable tuner. Good luck!

 

it's not all in the tune. if you put it that way it almost sounds as if you can run as much boost as you want as long as there's enough fuel and the tune is good.

the extra boost in a low compression engine is to pick up the slack of the lazy engine. it's either low boost w/ high compression or high boost w/ low compression.

IMO wouldn't go near 10psi. 8 still sounds kind of high and for reliability i'd be more comfortable with 5-6psi.

 

with a 60-1? depending on what exducer that turbo has it flows around 50lb/min

that of course reminds me, you have it in the .63A/R right? a .48 won't work for **** on an ITR

you'll probably have boost creep at 5-6 psi since you're outside the turbos efficiency range

somewhere around 8-10psi should be where you find 300whp if the rest of the setup is good.

at 5-6psi you might get 250whp ish, maybe, i just doubt you could get it to hold with a standard 38mm wastgate. maybe? you could try it. i just don't see the point when you can easily tune without knock at 10

 

I didn't mean it to sound like that. My bad. haha. But with "supporting mods" 8psi should be fine. Look into head studs, head gasket, adjustable cam gears to retard the timing..
And watch for knock.

 

11 psi is good on a stock B18C5, tuned properly of obviously. that'll be good for 300 wheel Hp range.

 

at 11psi with a good tune and arp's i give it 6 months before it pops unless you baby it. you'll be happy with 5psi. i have a friend that had a straight bone stock gsr ek coupe on 5psi that was runnin 13.2 on slicks and 13.6 on street tires all day long every wednesday and smashin it everywhere for 40k miles. he ended up messin up a ring eventually.

 

call kaizenspeed and see what they say. you'll be surprised i bet.

 

x2

 

1. the psi of the turbo has less impact on hp production than the lb/min the turbo can flow. that means 13lbs out of a 6262 is a LOT different than out of a 40 trim t3.

2. cracked ringlands are caused by detonation {usually}. if the tune is spot on a rod will be the first thing to go from simply being over powered.

driving the **** out of a turbo car for 40k is actually a pretty good life when you consider the mileage the engine likely started with.

it's also kind of difficult to tune a car to 5psi with a larger turbo. you'll get boost creep at the wastegate with a standard 38

there are **** tons of people who have driven years up to around 350whp on the stock b18c in either the gsr or itr variant.

the VAST majority of people ive seen blow **** up quick either short changed the setup or tried to home tune without knowing what they were doing.

driving for months on a basemap is another idiotic one.

 

i have a thicker head gasket and apr head studs already, its a t3/t4 60-1 .63 a/r, 38 mm tial wastegate with 4psi spring, 44mm tial bov, and im using hondata s300.. the guy who is tuning it is very fimilair with type r's and rsx's he tuned my friends gt30 stock k20 made 406 @ 14psi and it still going strong hes trustworthy and knos how to tune

 

have you ran this yet? i really would be shocked if you don't have boost creep or some major issues. 4psi through the intercooler is probably around 3psi.

i wouldn't even consider running a 60-1 under 8psi