What would my fellow GA16DE owners want from a built head? Massive HP/TQ gains in just the top-end or the best possible Mid-Top end power (something that's streetable and would still have some bottom end power)? I'm just curious because I have an automatic transmission and even if I upgrade to the JWT ECU, the car still won't change the shift points. The highest rpm it will shift at without manually shifting is 6,200 rpm. I'm also going to be using a 3,200 rpm stall converter from Level 10 , so my basic powerband would be something like the following at full throttle:
1st gear - 3,200-5,600rpm
2nd gear - 3,900-6,200rpm
3rd gear - 4,000-6,200rpm
4th gear - 4,200-redline
If I get the combustion chambers welded and reshaped to get a higher compression to 10.5:1 - 10.8:1 will I be required to get an ECU upgrade? Could the car be run on 92 or 93 octane and be safe without the ECU upgrade till later? Also, if the head was built to the JWT cam specifications would it be safe to run stock cams until later on? About how much can the cams help with higher compression, headwork & motorwork, and all the bolt-ons (I read something like 42 more hp over stock at 7300rpm on sentra.net but that's without headwork & motor work, right?)? I'd like do these things in stages rather than spending money on the DPR headwork, JWT cams, and the JWT ECU upgrade all at once.
This is what I would like to end up with if everything works right:
DPR Stage VI GA16DE Head (mild pocket porting w/ all DPR's goodies)
DPR Ported Intake Manifold matched w/
SE-R 60mm Throttle Body
JWT Cams
JWT ECU w/ VTC enabled
If VTC was not enabled by JWT in the ECU upgrade, how much power will be lost or would it be noticeably different? Sorry for all the questions, I'm just really curious about the options. DPR needs all the info that I can give them to make this all work properly. I'm hoping that I don't have to end up replacing it after a year of street use. I just want the engine run safely, dependably, cool, and powerful for a long time.
For the reliablilty/dependability/safety, should the bottom end be worked on at the same time as the head? What should be done to it? I've read that ARP rod bolts are needed. Would a metal head gasket be needed or is that just an extra precaution? Is there anything else? What has to be done to keep it cooled properly? Would boring it out help that much or would it be a waste of money if the head can be welded and reshaped for higher compression? Like everyone else, I'm also on a budget. So far the prices I've found are close to: $1100 DPR headwork w/ intake manifold ported ($1000 for headwork then $100 for intake manifold), $595 JWT Cams, $595 JWT ECU Upgrade, $269 VTC addition to JWT ECU.
Thanks for your time,
1st gear - 3,200-5,600rpm
2nd gear - 3,900-6,200rpm
3rd gear - 4,000-6,200rpm
4th gear - 4,200-redline
If I get the combustion chambers welded and reshaped to get a higher compression to 10.5:1 - 10.8:1 will I be required to get an ECU upgrade? Could the car be run on 92 or 93 octane and be safe without the ECU upgrade till later? Also, if the head was built to the JWT cam specifications would it be safe to run stock cams until later on? About how much can the cams help with higher compression, headwork & motorwork, and all the bolt-ons (I read something like 42 more hp over stock at 7300rpm on sentra.net but that's without headwork & motor work, right?)? I'd like do these things in stages rather than spending money on the DPR headwork, JWT cams, and the JWT ECU upgrade all at once.
This is what I would like to end up with if everything works right:
DPR Stage VI GA16DE Head (mild pocket porting w/ all DPR's goodies)
DPR Ported Intake Manifold matched w/
SE-R 60mm Throttle Body
JWT Cams
JWT ECU w/ VTC enabled
If VTC was not enabled by JWT in the ECU upgrade, how much power will be lost or would it be noticeably different? Sorry for all the questions, I'm just really curious about the options. DPR needs all the info that I can give them to make this all work properly. I'm hoping that I don't have to end up replacing it after a year of street use. I just want the engine run safely, dependably, cool, and powerful for a long time.
For the reliablilty/dependability/safety, should the bottom end be worked on at the same time as the head? What should be done to it? I've read that ARP rod bolts are needed. Would a metal head gasket be needed or is that just an extra precaution? Is there anything else? What has to be done to keep it cooled properly? Would boring it out help that much or would it be a waste of money if the head can be welded and reshaped for higher compression? Like everyone else, I'm also on a budget. So far the prices I've found are close to: $1100 DPR headwork w/ intake manifold ported ($1000 for headwork then $100 for intake manifold), $595 JWT Cams, $595 JWT ECU Upgrade, $269 VTC addition to JWT ECU.
Thanks for your time,