i have a b20b vtec set-up with jun 3 and jun valvesprings. my power drops after 7900-8000rpm. i've seen similar set-ups and power but with toda valvesprings revving to 9000-9500rpm.
so my question is,
1)would valvesprings affect rev/power.
2. have you heard of Haltech's A/F monitor called Haltuner? how accurate is it? it comes with its own sensor.
3. which is more accurate, apart from a dyno, and what's the tolerance % against a real dyno,
a) apexi rsm with g sensor
b) blitz power meter id
c) g-tech pro
Mods: intake,NGK blue plug wires, Spoon sports magnetic drain bolts, Spoon sports rad cap, spoon resevoir covers, Eibach Sportline springs, ITR front strut tower bar, ITR rear sway bar, Benen Industries rear lower tie bar, BSQ subframe reinforcement kit
i cant really answer the first two, maybe tuan can help (hes our hero!!!)
but as for the 3rd question, go the JDM route and get either the blitz or the a'pex-i RSM's
ive seen the a'pex in person, and its pretty cool. itll even do km/h.
i dont like companies that need infomercial type tv spots to sell their crap. if its good, who needs to advertise. just my 2 cents
i thought i heard that the g-tech is the most accurate of all. so i thought of asking you guys here. also heard that apexi power readings can vary up to 20%. heard nothing good or bad regarding blitz's though.
anybody can give me opinions on the first two questions too?
Stiffer valve springs do not directly affect power. They will however allow you to rev higher without worry of damaging your valve train. If your cams continue to make good power over and above your current redline then you should either get a new computer or have yours reprogramed and get those stiffer valve springs.
My new redline is 9,500 with my new ECU. My cams deffinately make power past my stock 8,000 RPM redline. I could not safely rev to that speed without the stiffer valve springs. Hope this makes sense, I'm tired as a mofo.
yeah, i get what you mean. but my question is, will valve springs decide which rpm band you'll get your peak horsepower. eg, like mine, my peak rpm horsepower is at 8000rpm(with jun racing valvesprings) & some with other valve springs have similar horsepower at 9000-9500rpm. this is not a question of who's got more horsepower, but more on where you get your peak horsepower. rev any higher, the power band on the dynochart will fall. so, get my question? answers please
Originally posted by IntegraGSR2000 Answer to question 1:
Stiffer valve springs do not directly affect power. They will however allow you to rev higher without worry of damaging your valve train. If your cams continue to make good power over and above your current redline then you should either get a new computer or have yours reprogramed and get those stiffer valve springs.
My new redline is 9,500 with my new ECU. My cams deffinately make power past my stock 8,000 RPM redline. I could not safely rev to that speed without the stiffer valve springs. Hope this makes sense, I'm tired as a mofo.
I like your set up man...have you taken the car to the track yet?
I'm planning to do almost the same thing but with JDM ITR pistons and regular CTR cams/ITR valvesprings w/ a mugen ECU.
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to answer your question as to wheher or not valve springs dictate how much power you make the answer is NO. the only thing that will dictate how much power you will produce is the amount of air an fuel you can you can vurn in a given cycle.
I like your set up man...have you taken the car to the track yet?
I'm planning to do almost the same thing but with JDM ITR pistons and regular CTR cams/ITR valvesprings w/ a mugen ECU.
I havn't had her to the track or to the dyno yet. I just turned the key about a week ago. It was in storage all winter. Most of the mods listed with the exception or I/H/E were done over the winter months. I've got a lot of tuning to do. I will post dyno numbers and track times when I get them...stay tuned!
that's pretty brave if you like to kick it to 9k a lot with a 1.54 rod ratio.
I agree! Considering the R/S ratio, this motor should not be built to rev to 9g. But if ya have to...
Quote:
i have a b20b vtec set-up with jun 3 and jun valvesprings. my power drops after 7900-8000rpm. i've seen similar set-ups and power but with toda valvesprings revving to 9000-9500rpm.
There are a few more details you didn't mention: what of the following are you using:
Head (any special work done to it? Stock valves? Lightweight valves and a 5-angle job might help you here)
Intake Manifold (shorter runners are better for high-end power)
Throttle body (bigger is better for high-end power)
Headers (JDM 4-1 is recommended for this motor size)
Cat (Y/N)
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well the cylinder head is from itr. the valves are stock itr's, the 5 angle valve job is done, ported & polished (bench flow tested), bottom end fully done (lightened & balanced), intake manifold is stock itr with little porting & polishing to it while the throttle body is bored to about 65mm. exhaust is 4-2-1 without cat, 2.5" piping to HKS Super Drager muffler.
Originally posted by dragster well the cylinder head is from itr. the valves are stock itr's, the 5 angle valve job is done, ported & polished (bench flow tested), bottom end fully done (lightened & balanced), intake manifold is stock itr with little porting & polishing to it while the throttle body is bored to about 65mm. exhaust is 4-2-1 without cat, 2.5" piping to HKS Super Drager muffler.
what do you think?
What kind of header exactly? I've noticed that in all motor setups, the header has a really big affect on the power.
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