maximum boost on the 4G63
Oct 29, 2003, 04:11 PM
#17
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Stay around 22 psi to be safe , also if you running this much try to get some higher octane fule to help prevent detonation. The highest ive pushed mine was about 21.5 on my greddy boost controller. I would not recommend much higher without doing any other mods.
Oct 30, 2003, 09:02 AM
#18
OK. My brother hit 1.6 bar wich is 23.2 psi with no problems. But now he keeps it at 1.35-1.4 bar wich is 19.5-20.3 psi on 93 octane fuel, now the question is... Is it safe for the engine to hold that much? the ONLY aftermarket parts are RMR intake and Grounding Kit... and of course GFB MBC. and one more thing... The MBC makes a hissing noise, i've determined the hiss comes from the MBC, not the Vaccum lines, Is that normal for the GFB MBC or is it a bad one?
Thanx
Thanx
Oct 30, 2003, 09:30 AM
#19
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i ran 26psi in my gsx with a S20g. stock bolts, cams, pistons, rods, pins, head, balancer, motor untouched, with over 85,000 miles on her. i had evc 5 boost controler, 255fuel pump, apexi i/c and pipes, apexi s-afc, turbo-xs rfl bov, ported exhaust manifold and intake and exhaust sides on the turbo, ss super dragger exhaust, act 2600 clutch, jun lighten flywheel, ect...
Oct 30, 2003, 10:32 AM
#20
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Originally posted by gonzstarr
OK. My brother hit 1.6 bar wich is 23.2 psi with no problems. But now he keeps it at 1.35-1.4 bar wich is 19.5-20.3 psi on 93 octane fuel, now the question is... Is it safe for the engine to hold that much? the ONLY aftermarket parts are RMR intake and Grounding Kit... and of course GFB MBC. and one more thing... The MBC makes a hissing noise, i've determined the hiss comes from the MBC, not the Vaccum lines, Is that normal for the GFB MBC or is it a bad one?
Thanx
OK. My brother hit 1.6 bar wich is 23.2 psi with no problems. But now he keeps it at 1.35-1.4 bar wich is 19.5-20.3 psi on 93 octane fuel, now the question is... Is it safe for the engine to hold that much? the ONLY aftermarket parts are RMR intake and Grounding Kit... and of course GFB MBC. and one more thing... The MBC makes a hissing noise, i've determined the hiss comes from the MBC, not the Vaccum lines, Is that normal for the GFB MBC or is it a bad one?
Thanx
20 PSI is fine.
Oct 30, 2003, 10:41 AM
#21
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Originally posted by ex-honda
let me rephrase the question. how much boost can the 4G63 motor handle before you have to change the internals?
let me rephrase the question. how much boost can the 4G63 motor handle before you have to change the internals?
But i will concur that 30 psi sounds reasonable given the strength of the motor in stock form
Oct 30, 2003, 12:15 PM
#23
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i would have to say that 30 sounds a bit high for any stock motor, however; for the 4g63 it's probably very possible. i myself would be a little hesitant (s/p?) to run that high. what's the highest anyone has run a stock "4g63 MOTOR" reguardless of what mods were done?
Oct 30, 2003, 12:17 PM
#24
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28 for me. But the car was making about the same power as it did at 24. I would think that PROPERLY tuned at 28 psi I would have blown something. nevertheless, It can do it. I think its more a function of power rather then boost. 500 whp at 22 or 30 will prolly do the trick, no problem.
Oct 30, 2003, 12:23 PM
#25
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yeah i know what you mean. 26 was hi boost for my car i tryed 28 psi but it felt like it was actually dropping off faster and it started to cut around 7,000 so i just backed it off and kept it at 26.
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