Redline in a modified B18?

[mellowboy]

Originally posted by CRXtc



thats not stock

Whats not stocK?? The bottom end is stock and the head is stock. The only thing he done to it was upgraded fuel.

[mellowboy]

Originally posted by 91civicDXdude
also just to add, you can run high compression with high boost but you also need high octane fuel (118 octane race fuel)

If its anything higher than 12 cr then yeh but anything lower then 12 is good on pump gas (93-94 octane)

[mellowboy]

Originally posted by redmanjd
lower compression the more turbo lag . high compression turbo is the best

Yep exactly!

[CRXtc]

Originally posted by mellowboy



Whats not stocK?? The bottom end is stock and the head is stock. The only thing he done to it was upgraded fuel.

and that whole turbo kit thing

[1320B4U]

Yeah, sure high c/r high boost is badass, but get real. First you gotta live on the East coast to get the 93+ octane. Second, you better have a standalone and some mad tuning skills to not get the D-E-T. And third, the engine is gonna be on the edge everytime you drive. Sure the import drag racers run insane amounts of boost with a C/R higher than factory, but the best gas, best parts, unbelievable amounts of tuning, and a whole 1320 feet at maximum throttle is a lot different than a street car.

[CRXtc]

Originally posted by 1320B4U
Yeah, sure high c/r high boost is badass, but get real. First you gotta live on the East coast to get the 93+ octane. Second, you better have a standalone and some mad tuning skills to not get the D-E-T. And third, the engine is gonna be on the edge everytime you drive. Sure the import drag racers run insane amounts of boost with a C/R higher than factory, but the best gas, best parts, unbelievable amounts of tuning, and a whole 1320 feet at maximum throttle is a lot different than a street car.

but a high compression motor will make more HP on lower boost levels then a motor with low compression higher boost

[mellowboy]

Originally posted by 1320B4U
Yeah, sure high c/r high boost is badass, but get real. First you gotta live on the East coast to get the 93+ octane.

WE get 93 and 94 here in Chicago buddy. AND OF COURSE ITS ALL ABOUT TUNING. IF i was into turbos i would choose high compression.

[mellowboy]

Originally posted by CRXtc


and that whole turbo kit thing

OK yeh but i'm sayin STOCK MOTOR meanin no work done to the internals.

[1320B4U]

AND OF COURSE ITS ALL ABOUT TUNING.

Second, you better have a standalone and some mad tuning skills to not get the D-E-T.

[BigBearWest]

Ther is a guy in town running an crv-tec running 10 psi. with stock components. he ran 13.8 in the 1/4 last week.

[1320B4U]

"but a high compression motor will make more HP on lower boost levels then a motor with low compression higher boost"

Both motors have forged pistons

Okay, take a B18B with low CR (say 9.0:1) and 20psi.

Now take a B18B with 10.5:1 and what, about 8psi safely.

On a properly prepped 4 cyclinder engine(correct A/F ratio) each PSI of boost is generally good for 10-15 hp.

So that low C/R B18 is what? 140hp at a stock 9.0:1. Say the setup is good and you get 12hp per PSI. So 240HP for the 20psi of boost added to the 140 at the stock 'low' 9.0:1 and you get
roughly 380 flywheel horsepower.

The 10.5:1 C/R is gonna have what? about 180hp considering a 10.0:1 8100rpm B18C1 puts out 170hp. Say the setup is great and it gets 15hp per PSI. Which comes to 120hp plus the stock 180 and your at roughly 300 flywheel horsepower.

Thats a simple way to say it. There are many variables (turbo size and efficiency, intercooler capacity, efficiency and pressure drop, tuning, exhaust, cams, ect. ect.) but its fairly accurate.

Its what you want. The high psi motor will have gobs of top end power and mid range torque, spooled by 3000rpm. The low boost motor will be more responsive and might spool its turbo a tick quicker.

[Redline_civic91]

Originally posted by BigBearWest
Ther is a guy in town running an crv-tec running 10 psi. with stock components. he ran 13.8 in the 1/4 last week.

dude that is not saying much. if that is true right there i truely feel sad for that dude. a crvtec with only bolt ons should hit that time. now with a turbo you should be in the high 12's low 13's easy.

[91civicDXdude]

any amount of boost requires tuning skills.

[CRXtc]

Originally posted by 1320B4U
"but a high compression motor will make more HP on lower boost levels then a motor with low compression higher boost"

Both motors have forged pistons

Okay, take a B18B with low CR (say 9.0:1) and 20psi.

Now take a B18B with 10.5:1 and what, about 8psi safely.

On a properly prepped 4 cyclinder engine(correct A/F ratio) each PSI of boost is generally good for 10-15 hp.

So that low C/R B18 is what? 140hp at a stock 9.0:1. Say the setup is good and you get 12hp per PSI. So 240HP for the 20psi of boost added to the 140 at the stock 'low' 9.0:1 and you get
roughly 380 flywheel horsepower.

The 10.5:1 C/R is gonna have what? about 180hp considering a 10.0:1 8100rpm B18C1 puts out 170hp. Say the setup is great and it gets 15hp per PSI. Which comes to 120hp plus the stock 180 and your at roughly 300 flywheel horsepower.

Thats a simple way to say it. There are many variables (turbo size and efficiency, intercooler capacity, efficiency and pressure drop, tuning, exhaust, cams, ect. ect.) but its fairly accurate.

Its what you want. The high psi motor will have gobs of top end power and mid range torque, spooled by 3000rpm. The low boost motor will be more responsive and might spool its turbo a tick quicker.

when i say high compression i dont mean 10.5:1, thats LOW compression, i am talking 11.5:1 or even 12:1

[BigBearWest]

Originally posted by Redline_civic91


dude that is not saying much. if that is true right there i truely feel sad for that dude. a crvtec with only bolt ons should hit that time. now with a turbo you should be in the high 12's low 13's easy.

At sea leval but we live in the rockies so say it is not a bad time