Will I break anything

I've been talking to DPR for a very long time about building a GA16DE. He said it's doable. A stage VI head with pocket porting and raising the compression in the head by shaping and re-welding the combustion chamber plus all his other things that he likes to do will cost $1000. He told me that he could probably get the intake-exhaust ratio to 78% and he can raise the compression to 10.5:1 and maybe up to 10.8:1. I also asked him about the JWT cams and he said he can build the head with the cam specifications: .345" lift 263 degrees duration @ .016" valve clearance

I also talked to him about me getting a SE-R throttle body port matched the intake manifold and then porting the intake manifold to match the intake ports. He'd charge $100 for that if you get the head done by him. Total cost, $1100, a very very good deal.

In addition to all this, Dan said with those cams and his headwork with the TB & IM that little sentra will fly! I agree with him, especially after looking at the gains on Sentra.net with just the cams and the JWT ECU.

I plan on going NA if everything works out right. And don't forget, we've got VTC! Gotta have it! The Flatter wider powerful powerband.

adam said: So does he intend to use the stock pistons after increasing the compression ratio that way? I'm a little confused on that part, it sounds like yes. What would happen if we send him the head and get it done with the JWT cam profile and put it back on before we get the cams? Also, for the IM, do you have to send him the throttle body too?

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He intends to use the stock pistons and stock everything except the head. The head would be worked on and he said it should run fine without the JWT cams even with the head made for the JWT cam profile. If I remember correctly, the JWT cams are designed to be used in a stock head without modifications so it should work the opposite way (build the head ready for cams and then when you're ready put in the cams and do the ECU at the same time). Yes, for the $1100 price, you will have to send a GA16DE head, Full intake manifold dissassembled & cleaned, and throttle body (jumping from 48?mm or 50?mm to a 60mm). If you choose the $1000 route you just send the head. (It's a really good value to get it all done at once, just sending the intake manifold to Extrude hone would cost over $300. DPR usually charges $200 for the porting.)

This setup that I've been talking to him about was designed for the most amount of HP and TQ for an automatic sentra. He would design it where there would be no loss on bottom end and as much effeciency as possible for optimum hp & tq all the way through the powerband, unlike a peaky 5500rpm& up powerband like N/A hondas. Basically, he'd design it where the useable daily driven powerband is optimized. (This also helps with reliability, you're not going close to redline just for some power, keeps the bottom end from getting over revved. If I remember right, the stock motor is not designed to go very high rpms every day. Even with the JWT upgrade which raises the redline even more. The internals are made to go only to a certain rpm and then they get harmonically unbalanced.)