What kind of hp can the stock heads and cams (06 model revup) flow? I ask because I want to know if building just the short block is going to be enough to get near 550-600hp. The problem is that as long as there aren't any cams available for the rev-up motors, I don't see much value in doing any headwork. It doesn't makes sense to tear apart the head to put the stock stuff back in with just porting done and a valve job, especially if the car only has under 10K miles on it. Also, can someone also answer this question for the older (287hp) motors as well. Thanks a lot.

 

I just think you have to wait. The same thing is going on with the EVO IX's because they have the new mivec engines. The cam timing gets advanced. Now the Z's advance both intake and exhaust so cam manufacturers need to change the designs a bit but not too much. I would suggest just being patient.

 

I appreciate the response and I may just wait a while but would you happen to know where the limits of the stock heads/cams might be on either model motor (287, or 300hp)? I can't be the only one that wants this info. So who knows out there guys? At what point will the head/cam combo stop making power?

 

I just talked with Mark at SGP and he said he has made over 550rwhp on the stock heads and his word is good as gold to me. Expect another monster to come out of SGP in 06 guys.

 

But with headwork and cams you would probably be able to achieve same whp with significantly less boost no?
I am not planning to go over 500 whp any time, so now I'm wondering if I should save myself $$ and just do the bottom end... Which FI kit are you working around anyway?

 

I have ported heads, oversized valves, and everything else with stock rev-up cams, so im wondering about this too. The car will be finished pretty soon at SGP, maybe mark was talking about mine.

 

Correct me if I'm wrong, but are you planning to run the SFR kit on stock bottom end? What was the purpose in going with something this expensive? Just wondering, b/c I was looking at it myself, but stopped when realised that it would pay to use it only if you have like a 800 whp target... I could be wrong though...

 

bottom end is not stock

 

Oh, I stand correted...

 

LOL.....It is just a little way from being stock

 

As Nismo just released their S2 engine kit for 05 and 06 cars too, and they are using Spec 2 cams... so soon that Nismo would release the individual cam parts for the revup motor, then you can consider putting a set in!

cheers,

richie

 

Oleg, stay away from the forums..Your confusing yourself..
On stock heads you will flow pretty good if you have a good freeflowing exhaust to match. A port and polish will yeild about 40-60whp alone without cams..Combined with cams your looking at at least 100hp gain over stock heads..

 

More than likely, APS tuner kit with an undecided EMS. Mark said EU and if that is what the guys are comfortable tuning then I see no reason not to go with it. I would like to try some of the new stuff like the UTEC or go big like the V-PRO but I think for my more modest goals, the EU should be fine. I am kind of curious about this JWT kit now that more info is out there. I still have some time to think about it so we'll see.

 

Please tell me your joking. I think I get it. He is getting work done at your shop isn't he?

 

Kyle, I just read the story. Good luck on your new venture. How long ago did all this happen? I was told that you were no longer at SGP but no one ever told me why. You probably don't remember me. I was Thomas(Houston) at tt.net. I had a 91 300ZXTT (black with AVS rims) that you guys were working on. You might remember the B&B with horrible fitment issues that you guys had to struggle with. After some rumors, I foolishly stopped taking my car to SGP and had it built elsewhere. Anyhow, good luck and you'll hear from me for a few things.

 

100 hp for headwork with cams... On only 11 PSI w/Greddy?

Would you please ellaborate?

 

Stock heads should flow enough for 550whp...BUT...you will use a lot more boost and create significantly greater thermal load on the motor. It's not a good strategy, IMHO. I would stop at about 500-525whp on bone stock heads, assuming pump gas.

 

Thank you for jumping in...

So what do you think, after riding in several FI Z's with power ranging from 400 to 550whp I came to a conclusion that when my project is complete, 80% of time I will be driving at 400 whp, with an ocasional venture into 500whp realm. Do you think headwork is a wise investment, or should I stick to a shortblock and use the headwork fund elsewhere (better exhaust, LSD, better coilovers or a fully built 5AT...)? BTW, B/C of this I am thinking about running high compression and install alcohol injection for use with higher boost...

What are the benefits of P&P/cams aside from the being able to achieve same power with less boost? How much quicker will I be able to rev and what would be the effect on spoolup quickness (I am talking about using the Greddy TT)?

What would be a reasonable amount of time to expect my heads to last in this setup? I don't bounce off the limiter that much when I drive...

 

for 500whp or less, I would spend the money elsewhere, as you have outlined, rather than fully building and cam'ing a set of heads.

Aside from the obvious benifits of more power at a given boost level, and less thermal load on the motor, built heads will shift the power band to the right, and allow you to safely rev the motor to 7100-7500rpm without risk of valve float.You will give up a little bit of trq, turbo spool-up below 3500rpm.

 

OK, so I understand that the top end will be somewhat less then with built heads...
But giving up of the torque and spool-up, is it WITH built heads or WITHOUT?