VTEC turbo

[flamefox850]

hehehe..dun say VTEC is for NA here aaa hehe..outside so many vtec turbo already. why here in malaysia it is rare one ? takut aa ?

so, what's the problem when turbocharging the vtec engine other than cost problem ?

open deck type block can be solve by putting block guard..other problem ?
high comp piston = change piston la and good metal gasket
vtec stock camshaft smeone says it is meant for NA (longer duration on intake and shorter for exhaust) and it is not good for turbo unless chage to camshaft with longer duration of exhaust side..is it true ?

more more problem to encounter ?

 

[TODA6866]

u aledi said it urself...........

dun say VTEC is for NA here aaa

what's the problem when turbocharging the vtec engine other than cost problem

 

[flamefox850]

aiseh..u r not answering my question bro..nvm...next

 

[Joeker]

I think tuning is main problem when comes to Turbocharging N/A expecially variable valved N/A engines.

 

[SiRCRX]

No prob laaa . Go to a good tuner & everything is safe & sound.
Got friends with 2.0L TypeR Vtec Turbo NOS.
Problem is $$$$$$

 

[flamefox850]

owhh yeah..that sounds better hehe.

how much is B16A manual halfcut now ? and B20B enjin kosong ?

 

[Itab]

may i know from which car is the 2.0L typeR Vtec engine from ah?
B18C is from integra typeR DC-2 mah,then 2.2L Vtec Prelude's engine i donno wats the code la....then cicv typeR is B16B mah...
hmm....2.0L,got accord typeR?
me not very familiar with honda engines la... :P

 

[ezwong2002]

yeah.. VTEC Turbo is same like MIVEC Turbo... engine management system is very important for both technologies to work together.. even if u have $$$ but if u have a bad tuner.. ur VTEC Turbo is useless... a decent N/A engine also can beat the crap out of you.. but if tuned properly (with the right hardware).. it's a real monster... good luck.

Itab.. i think he meant B16B engine change to 2L block ler.. most common block is the CRV block.

 

[flamefox850]

K20A from DC5 is type R or not ?

yeah..tuning is of cos for most car is important..yeah vtec turbo need serious management system..but that's i think can be solve. my current car now also a hybrid NA to turbocharge with bigger block but no VVT system hehe

how about parts ? any critical parts have to be change other than piston ? is conrod is essential ?

 

[Itab]

yeah K20A is the DC5 typeR engine,tht's wat i read in the magazines la
but half cut for tht engine should be damn rare n damn expensive i guess,since it is still so new

 

[Itab]

ezwong2002,
i see....i thought of the CRV engine also,but the old CRV engine is non Vtec one rite?so ruled it out lo.....
can change B16B engine with CRV block one ah?how's it done ah?i don really understand these hybrid mods la,please explain to me :)

 

[koolspyda]

Originally posted by Itab@Jul 16 2004, 11:48 PM
ezwong2002,
i see....i thought of the CRV engine also,but the old CRV engine is non Vtec one rite?so ruled it out lo.....
can change B16B engine with CRV block one ah?how's it done ah?i don really understand these hybrid mods la,please explain to me :)

i don't think it just the matter of $$$.

Vtec is a high compression engine. To achieve a long lasting reliable without changing internals is in the long term ,..... is not the most ideal.

why do turbos (the high powered monsters) have forged pistons?
why do most good tuners lower the compression when they turbo the VTECs?

search sites on turbo esp vtecs.

this reasoning is also applies for other marques (high compression engines)

 

[flamefox850]

i think this kinda info too many people know la bro..

high comp engine NA turbocharge have to change to low comp piston change thicker metal gasket bla bla...all people know already..no need to mention

yes..it is a matter of money. u dun even need the vernier caliper to measure ur piston height or bore or whatever..now all in the performance store dude.

what i want to know here is what else do we need to take attension rather than low comp piston and thicker metal head gasket ? and also block guard

what about oil pump gear ? anything else ?

 

[akimoto]

turbochargin ur vtec doesnt necessary need to change to low comp pistons.
stock pistons without blockguard, but thick gasket - could get u to boost good to 1.1bar

Most important is the tuning part ;)

 

[3R1C]

NA = High compression
Turbo = Low compression
NA + Turbo = Lose compression????

I dunno... :S:S:S:S

 

[TE27levin]

vtec b16a run quite high duration cams, it good for n/a to have more overlap at high rpm to keep the pressure at high rev to make more power. so before the vtec kick in it will need to run lower duration to keep the pressure or else the air will push out from intake to exhaust.

for turbo you don't need a high duration cams, that why most vtec turbo unable to perform well if u only touch on fuel/ignition management and forged internal.
with stock cams, intake side will blow the pressure out to exhaust if the exhaust valve don't close tight to hold the air in time.
vice versa the pressure at exhaust side hot exhaust air will force go into the piston and cause the burned air stay inside the camber.

Beside that turbo size also a issue, for a example 4AGE with stock camshaft 232duratioin 7.3lifting using a t25 from a CA18 engine it only can hold around 1bar from 2500rpm up to redline 7000rpm. above 7000rpm u will get all the hot air and turbo start to suffer. if u go over 1.3bar turbo will not giving power above 5000rpm.

b20b block will work better with stock b16a cams cuase the longer stroke will bring the power band lower.

Get a sets of high lifting cams but lower duration will perform better.

 

[ezwong2002]

Originally posted by flamefox850@Jul 16 2004, 09:56 PM
owhh yeah..that sounds better hehe.

how much is B16A manual halfcut now ? and B20B enjin kosong ?

the last i've got the price for a manual trans B16A with jasma approved extractors were RM5,800 unbelieveable high price for a 1.6L engine... but according to the new owner.. he is very satisfied with the 1.6L performance.

 

[flamefox850]

Originally posted by TE27levin@Jul 17 2004, 11:55 AM
vtec b16a run quite high duration cams, it good for n/a to have more overlap at high rpm to keep the pressure at high rev to make more power. so before the vtec kick in it will need to run lower duration to keep the pressure or else the air will push out from intake to exhaust.

for turbo you don't need a high duration cams, that why most vtec turbo unable to perform well if u only touch on fuel/ignition management and forged internal.
with stock cams, intake side will blow the pressure out to exhaust if the exhaust valve don't close tight to hold the air in time.
vice versa the pressure at exhaust side hot exhaust air will force go into the piston and cause the burned air stay inside the camber.

Beside that turbo size also a issue, for a example 4AGE with stock camshaft 232duratioin 7.3lifting using a t25 from a CA18 engine it only can hold around 1bar from 2500rpm up to redline 7000rpm. above 7000rpm u will get all the hot air and turbo start to suffer. if u go over 1.3bar turbo will not giving power above 5000rpm.

b20b block will work better with stock b16a cams cuase the longer stroke will bring the power band lower.

Get a sets of high lifting cams but lower duration will perform better.

haaaa..i like this guy's explaination

that's what i've read from the net...now i want to ask u guys a question...can overlapping on a DOHC vtec be alter by using adj. cam pulley ?

is it 1 cam for exhaust and 1 cam for intake ? if that so, we can adjust the overlap to make it shorter if we adjust the intake cam to retard and exhaust cam to advance..is it ?
this will ensure the engine to blow the all the exhaust during exhaust valve and fresh air coming from boost will only come when the exhaust valve close. can we do that ? :huh:

so, using standard cam also can feel the performance better rather than spending money on performance cam

 

[Joeker]

T25 is not meant for hi-rev & hi-boost beause by then it would have exceeded its compressor efficiency map.

keep an eye out for the oil pressure too as the turbocharger will lower the pressure. (VTECs run on high oil pressure)

If not mistaken, most modern day cars have valve overlap. As long as the degree is more than 180, overlap already exist.

Its a fact tat N/A engines benefit greatly from long duration cams, but to say that such overlapping cam profiles do not benefit forced induced engines is not entirely correct.

THere was a HUGE argument in ZTH version 1.0(3 or 4 years ago liao) about the benefits of long duration cam profiles for Forced induced engines. I wished I copied and saved the facts and figures of those postings (at tat time I was just driving 1.5 carbie and could not be bothered because all of them were talking Russion as far as I'm concern)

 

[BLaCkHoWLiNG]

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