s/p percentage increase
06-28-04, 02:03 AM
#1
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s/p percentage increase
my cars at 167,000kms right now and im already planning its future when it hits about 250,000kms.
a rebuilt streetported engine. now ive heard that there r different levels of a streetport alone (mild...aggressive..etc.).
GENERALLY, what percentage increase r we talking here for a streetport (approx). lets say all stock.
its 91 n/a...mods....K&N drop in, RB cat back...hollowed pre-cat.
thanks,
Carlos
ps - ive searched, but no answer on the percentage increase
a rebuilt streetported engine. now ive heard that there r different levels of a streetport alone (mild...aggressive..etc.).
GENERALLY, what percentage increase r we talking here for a streetport (approx). lets say all stock.
its 91 n/a...mods....K&N drop in, RB cat back...hollowed pre-cat.
thanks,
Carlos
ps - ive searched, but no answer on the percentage increase
06-28-04, 02:21 AM
#2
Exhaust leak
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Streetporting:
Also available is streetporting. Streetporting (Sp) is an internal intake/exhaust modification that can only be performed while the engine is disassembled. It is similar to swapping cams on a piston engine, it affects airflow (think lift) and timing (think duration). SP’ing is to be regarded as any other airflow mod (like air filter or exhaust mod) as far as power increases go. A large Sp on a stock car, for instance, might not be as noticeable as a small Sp on a modified car. Sp’ing doesn’t really change your idle ability, though a large SP can change idle tone a bit. IT does affect your driveability, mainly your low end pull. Especially, for instance, pulling out on a steep hill from a dead stop. For those of you who have installed a lightweight flywheel on a stock car, the difference a large Sp will make to your low end is similar. The gains on top end are definitely worth the risk, however. Gains from an Sp on a nonturbo are not large, but still worthwhile, around 5-15hp depending on mods. Gains on a turbo model are usually quite a bit higher, anywhere from 10-25hp+ depending on mods.
At this time I basically offer 2 “sizes” of porting, small and large. The small port can produce gains of 5-10hp on an NA motor, and 5-15hp on a turbo motor, depending on other mods. The larger version can produce 10-15hp on an NA motor, and 10-25hp on a turbo engine, again depending on mods. The small port is basically some intake porting with very light exhaust porting, and the larger port receives more of each.
Taken from http://www.rotaryresurrection.com/
Use the math figuring that stock 91 n/a has 160 hp.
Also available is streetporting. Streetporting (Sp) is an internal intake/exhaust modification that can only be performed while the engine is disassembled. It is similar to swapping cams on a piston engine, it affects airflow (think lift) and timing (think duration). SP’ing is to be regarded as any other airflow mod (like air filter or exhaust mod) as far as power increases go. A large Sp on a stock car, for instance, might not be as noticeable as a small Sp on a modified car. Sp’ing doesn’t really change your idle ability, though a large SP can change idle tone a bit. IT does affect your driveability, mainly your low end pull. Especially, for instance, pulling out on a steep hill from a dead stop. For those of you who have installed a lightweight flywheel on a stock car, the difference a large Sp will make to your low end is similar. The gains on top end are definitely worth the risk, however. Gains from an Sp on a nonturbo are not large, but still worthwhile, around 5-15hp depending on mods. Gains on a turbo model are usually quite a bit higher, anywhere from 10-25hp+ depending on mods.
At this time I basically offer 2 “sizes” of porting, small and large. The small port can produce gains of 5-10hp on an NA motor, and 5-15hp on a turbo motor, depending on other mods. The larger version can produce 10-15hp on an NA motor, and 10-25hp on a turbo engine, again depending on mods. The small port is basically some intake porting with very light exhaust porting, and the larger port receives more of each.
Taken from http://www.rotaryresurrection.com/
Use the math figuring that stock 91 n/a has 160 hp.
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