Description
Full Race port good for 7800-9000 rpm peak power.
500-800 rpm better spool
***Has exhaust polish which reduces heat transfer keeping engine cooler and further turbo response***
Typically, 5-11 psi boost reduction for the same power in the same set up. (Larger differences are possible)
Ratings below on a scale of 1-10 how good this cylinder FK8td ported head will perform for the application compared to stock.
******This does NOT apply to other companies cylinder head port work*******
Drop in turbo power gains stock=5-6 Full race ported =7 (Still gains a lot but better for full frame)
Full frame turbo gains stock=4-6 Full Race ported=10 Massive gains on g30 or larger turbos
Street manners stock= 9 Full race ported= 7.5-8 Above 120f engine coolant temp drives like stock.
Drag strip use stock=3 Full race ported =10
Circuit racing or autocross stock =5 Full race ported =8
Roll racing stock=1-5 Full race port =7-8 (rating relevant to turbo size)
Turbo spool and lag response on a drop in turbo stock=3-5 Full race ported =9-10
Turbo spool and lag response on a full frame turbo stock=2-5 Full race ported =9-10 (g25-660.72 ar works ok stock head, larger ar and larger turbos do not)
Boost reduction using stock camshafts stock=0 Full race ported=6-10 psi reduction for the same hp
Boost reduction for the same power using camshafts stock=2-6 psi Full race ported =10-18 psi reduction for the same hp.
Cold start manners (overnight on hondata) stock= 10 Full race port=7-7.5
Cold start manners (overnight on Motec) stock= 10 Full race port=8.5
Cold engine drivability stock=10 Full race port=8
Fuel efficiency stock=10 Full race port=7.5(loses 5-7mpg when tuned properly)
Knock sensitivity reduced near timing limit stock=4 Full race port= 10 (less sensitive to timing making tuning safer and easier near the limit)
Peak power capability (gains grow w turbo size) stock=3-5 Full race port= 10
Minimum size turbo recommended stock=stock turbo Full race ported= g25-660 w.92AR or G30-660 or larger turbo suggested.
Typical gains per the turbo are (G25-660 60 whp, G30-770 up t0 70-90whp, G35-1050 90-120+whp)
Testing with a G30-825 using stock head does not exceed 400 wheel torque until 5200-5500 rpm compared to ported head will exceed 400 wheel torque by 4200-4600 rpm using an Fk8td Ported head
Gains are mostly exponential with turbo size using ported heads
Peak power capability estimated at 1000whp+. Exhaust outlet enlarged to match v-band flange volume. This is critical for big power. It’s possible to make more depending on turbo, fuel and compression. The estimation is using a heavy roller Dynojet and not a hub dyno. Hub dyno does not have wheels and is more like crank hp readings.
Race ports can have larger fuel consumption and may require slightly more fueling than expected. 3-5% is to be expected.
Pockets are ported blended into dividers
Intake bowl shape and intake runner sizing are different for a Full Race port
Exhaust short side radius shaped differently to add more top end flow
Full internal of exhaust inside the head is enlarged.
Guides were removed to ensure clean transitions and bowl shape
Intake port divider is knife edged
Heavy casting flash is sanded down through full intake port
Exhaust outlet enlarged
Full polish through ENTIRE internal exhaust area and pockets of the cylinder head
Bronze guides installed
Custom valve job on Serdi
fully cleaned and ready for assembly
Does NOT include any valve train
NO CORE CHARGE OR EXCHANGE
not returnable
Reviews
There are no reviews yet.