k31th less WHY; more WOT Site Developer 29,039 Member For: 16y 8m 7d Gender: Male Location: Melbourne Posted 22/11/18 07:32 PM Share Posted 22/11/18 07:32 PM Delicious 1 Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 6m 16d Gender: Male Location: Adelaide Posted 22/11/18 09:43 PM Share Posted 22/11/18 09:43 PM Well then ! Link to comment Share on other sites More sharing options...
samhouston Donating Members 153 Member For: 15y 7m 8d Gender: Male Location: Brisbane Posted 07/12/18 02:25 PM Author Share Posted 07/12/18 02:25 PM Yeah I was very happy with the end result, but the development isn’t going to stop just there. Basically the difference between the last build and this one was a new cooler and intake, dry sump, but most of the power gains have to be attributed to the cylinder head. We are seeing well over 300CFM through the inlet side, and we made peak power at relatively low RPM to what I have seen people revving these engines too. The engine still retains a factory crank and standard stroke at this stage, and all the tuning is done via SCT with the standard ECU. Colin is a wizard with these cylinder heads and I’m stoked that he tells me he has heads coming in the door from all over. I will try and keep this a bit more up to date 5 Link to comment Share on other sites More sharing options...
500FPV New Member 2 Member For: 6y 29d Posted 08/01/19 10:34 AM Share Posted 08/01/19 10:34 AM Funny who ya find looking around forums lol 1 Link to comment Share on other sites More sharing options...
HI PSI Member 1,586 Member For: 18y 6m 22d Gender: Male Location: Central Queensland Posted 08/01/19 12:10 PM Share Posted 08/01/19 12:10 PM On 12/8/2018 at 12:25 AM, samhouston said: Yeah I was very happy with the end result, but the development isn’t going to stop just there. Basically the difference between the last build and this one was a new cooler and intake, dry sump, but most of the power gains have to be attributed to the cylinder head. We are seeing well over 300CFM through the inlet side, and we made peak power at relatively low RPM to what I have seen people revving these engines too. The engine still retains a factory crank and standard stroke at this stage, and all the tuning is done via SCT with the standard ECU. Colin is a wizard with these cylinder heads and I’m stoked that he tells me he has heads coming in the door from all over. I will try and keep this a bit more up to date We were rather surprised at the amount of increased flow in the head, when we did mine. I have been advocating the benefits of cylinder head work for some time, but 99% of responses I get are "Just throw more boost at it instead"... It's good to see others seeing the light and realising the benefits. Out of curiosity, what size valves did you use? 1 Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 1m 20d Gender: Male Location: Perth Posted 08/01/19 12:18 PM Share Posted 08/01/19 12:18 PM Head work rules. here is 400 rwkw on 15psi.. Factory turbo.. 98 fuel. 1 Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,039 Member For: 16y 8m 7d Gender: Male Location: Melbourne Posted 08/01/19 12:19 PM Share Posted 08/01/19 12:19 PM spool is so gradual... torque is nice above 3500rpm, though. Link to comment Share on other sites More sharing options...
samhouston Donating Members 153 Member For: 15y 7m 8d Gender: Male Location: Brisbane Posted 08/01/19 12:21 PM Author Share Posted 08/01/19 12:21 PM Power is all made in the head, I am using a 10 year old turbo and standard ECU, so I’m pretty impressed with how it’s all gone. I am using 1mm oversize inlet valves and standard exhaust valves. Link to comment Share on other sites More sharing options...
adams355 Member 529 Member For: 7y 7m 16d Gender: Male Location: Brisbane Posted 08/01/19 12:35 PM Share Posted 08/01/19 12:35 PM (edited) If Colin did it, the valves would most likely be standard. He is a master and its not all bigger is better. Awesome work on all variety of V8's and all motors as well. $1800 for xr6t head 'street port' with springs supports up to 1200rwhp on e85. Edited 08/01/19 12:42 PM by adams355 Link to comment Share on other sites More sharing options...
adams355 Member 529 Member For: 7y 7m 16d Gender: Male Location: Brisbane Posted 08/01/19 01:20 PM Share Posted 08/01/19 01:20 PM (edited) 1 hour ago, k31th said: spool is so gradual... torque is nice above 3500rpm, though. Unless it was tuned like that it is not a good example of headwork. I would suggest that the head has been over (full) ported and/or valve size was increased unnecessarily. Its not just about flow. Its about velocity, even with turbo. Especially with stock cam. Edited 08/01/19 01:22 PM by adams355 Link to comment Share on other sites More sharing options...
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