i predict a gain of less than 10hp (thats being very generous). if the OP wants to learn the hard way than thats cool. just dont be ashamed to post up results. and the price of everything so i can laugh.
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2005 ALTIMA SER 6SPEED
-ENOUGH MODS TO WHOOP YOUR ASS!!!!
-THIRD PLACE IN V6 N/A DYNO COMPETITION AT
NOPI NATIONALS 2006.
Quote:
Originally Posted by swat1279
Tuko316, that vortec cyclone that you mentioned,ordered 2 and works great. I got great gains Thanks. Oh and your car is sharp dude.
10HP switching to the HR heads? HR flows more air. Cams are more aggressive compared to the DE. With a good tune I see the possibility for 25-30 or even more WHP! How do you think the 4th gen DE does so well up-top? Even w/o the ability to utilize the timing control for the exhaust side shouldn't really matter. The bump in flow should be more then enough. But then again this will also depend on what other supporting modifications the OP has. He will also be able to use the 4th gen manifold which from what I gather is the BEST flowing FWD manifold. Heck, maybe even experiment with the SSIM mod on the 4th gen.
whats the cfm rating on the hr heads? the cams arent that aggressive. they are similar to jwt. which we all know are so so. with all other bolt on that adds 12whp the most. a regular port and polish job would add 20whp with tune and supporting mods. the de heads flow well from the factory so there isnt much of an improvement. i strongly think the hr heads would not provide gains any where near 30whp.
stock DE heads flow 310cfm. HR's arent going to flow much more than that.
why? why not just build the motor thats in the car? the hr motor benefits from the cvtc on both intake and exhaust. when swapped into your car you have to eliminate it on one side. you get a slight increase from the cams but with that money spent you can pick up a set of brian crower cams for 850 and have more power.
you have a lot to learn.
where can i buy brian crower cams for 850, cheapest ive seen is like $1023. and why would you eliminate one side of it? i dont see why you would.
but either way the new altimas with just intakes in some cases are putting down almost 260 whp, now i know thats still the DE motor but they get more power out of the newer engine than we ever could with just I/H. plus the HR responds better to upgrades and revs better than the DE motors. which i dont know if you know helps with aftermarket performance. the main reason why id like to try this is because it's something new that noone else has. iam only gonna do this when i get another car and by that point i wont care about throwing money into this car.
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Code Red 6spd SE-R
with a few upgrades....run up on it.
I was just posting that because of the topic. Its better when you can get some of your questions answered with vids. You see how his rpms just dive to redline with no hiccup or drop off between shifts!!! awesome!
That car is definately awesome. It revs pretty high and that's with stock valves.
Nismo: your not understanding what I'm saying. You'd need to block off the cvtc on the exhaust because you can't use it. The new altimas come with 25 more hp than the se-r 35 more than the se. The factory changed the way the hp was rated. Keep looking for cams. Once in a while you can find a special price. I'm not giving all my secrets away.
Raising compression doesn't increase hp by much. Finding horsepower depends a lot on your cam and intake setup.
Someone has a built block with higher compression and .020 over pistons with stock heads and cams. He only has a valvejob. With some simple bolt ons and a tune he is only putting down 260whp.
That car is definately awesome. It revs pretty high and that's with stock valves.
Nismo: your not understanding what I'm saying. You'd need to block off the cvtc on the exhaust because you can't use it. The new altimas come with 25 more hp than the se-r 35 more than the se. The factory changed the way the hp was rated. Keep looking for cams. Once in a while you can find a special price. I'm not giving all my secrets away.
Raising compression doesn't increase hp by much. Finding horsepower depends a lot on your cam and intake setup.
Someone has a built block with higher compression and .020 over pistons with stock heads and cams. He only has a valvejob. With some simple bolt ons and a tune he is only putting down 260whp.
no i understand what your saying i would have to block it off, but what I dont get is how you came to that conclusion? both altimas motors are mounted in the same places and there the same size motors
You have to block it off because a sensor plugs in a hole in the HR heads. It won't be used if you swap them in a DE car. If you don't cap it you'll probably have oil spewing out. Only way to get it to work is if you get a computer from a HR and wire everything in. Which wouldn't be a good bang for the buck. Id rather get cams and a utec and have more power for less money than the cost of STOCK HR heads and a custom factory engine harness.
Any shop that has a reputation for building vq's will know what I'm talking about. Just don't expect to dish out a few hundred bucks for stock HR heads n expect gains. Huge gains at that.
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