Acclereation...!!!!

[fritz_269]

Originally posted by Veetec
A VTEC-controller...? But my engine is bone stock (going to buy a K&N drop-in maybe)! How big will be the gain?

A VTEC controller alone won't give you any more peak power, but it will smooth out the big bump in the power curve. It doesn't matter that you're bone stock.

Read this:
http://members.aol.com/ryoucold/prelude/apexi/apexi.htm

[buh_buh]

with a VTEC controller, how do you know where to engage the VTEC at? If you set it at too low RPM can you wreck the car? Is it easy to mess it up?

[Veetec]

Originally posted by Jacques
The Jr. VPAC (by Jackson Racing) can be used on n/a cars if you leave the boost timing controller wires unused. Theoretically, it would work similarly to APEXi's V-AFC.

However, the V-AFC has the advantage of adjusting fuel delivery. The VPAC cannot optimize the car's fuel setting...keep in mind, it has only a knob to adjust the VTEC engagement only, adjusting fuel/timing "automatically", so JR claims.

Okay, I see! The problem is that it has to be adjusted on a dyno and I dunno about any shops over here in germany who could do that! What gains would I get on a stock car with just a removed resonator and a K&N drop-in filter? And then if I would also put a new exhaust on it (let´s say one of DC-Sports)?

[supafly1024]

Originally posted by Veetec

I see! But the problem is that a DC-Sports header will cost me about $600 over here in germany and IMO 2,65hp is not much for its price. Germany is really expensive when it´s about aftermarket parts for asian cars.

Geez, that is a lot of money for a header. You're right, it's not worth it for the money, but if you get an intake and exhaust sometime in the future then the header might just be worth the money if you're trying to squeeze more power out of your engine.

Buh Buh, about adjusting the VTEC engagement point. I've heard that there is no point in putting it any lower than like 4500 RPM, I think I may have heard of people putting it down to 4400 RPM too.

[buh_buh]

Originally posted by supafly1024


Buh Buh, about adjusting the VTEC engagement point. I've heard that there is no point in putting it any lower than like 4500 RPM, I think I may have heard of people putting it down to 4400 RPM too.

can I wreck th engine if I set it wrong? How do I know what to set it at to get optimum performance?

[supafly1024]

Originally posted by buh_buh

can I wreck th engine if I set it wrong? How do I know what to set it at to get optimum performance?

I'm not sure if you can wreck the engine but I do know you can make your car run bad if you set it wrong. You can always reset all the settings though. As long as you keep the VTEC engagement point above like 4400 RPM and don't go crazy with the fuel settings you should be okay. The only way to really be sure is to get some dyno time with it and set it up there. Most people end up with the VTEC engagement point right around 4400-4500 RPMs and leaning up the fuel some at lower RPMs since Preludes do seem to run a little rich from the factory. Below is something I found at the following address http://prelude.vtec.net/gen5/perform...rformance.html it is about the FIELD controller but the settings for a A'pexi VAFC might not be all that different. Go here to read more about VTEC controllers in general
http://prelude.vtec.net/gen5/performance/vtecctrl/ this page tells you why to not set the VTEC engagement point too low. Notice that below they say to set the VTEC transition to 4200-4400 but lately I hear most people setting it at 4400-4500.

Optimal Settings **
VTEC Transition Point 4200-4400 RPMs
Fuel Settings
RPM +/-%
1000 -4%
2000 -4%
3000 -4%
4000 -4%
5000 -4%
6000 0%
7000 0%
8000 0%

[Veetec]

Originally posted by fritz_269

A VTEC controller alone won't give you any more peak power, but it will smooth out the big bump in the power curve. It doesn't matter that you're bone stock.

Read this:
http://members.aol.com/ryoucold/prelude/apexi/apexi.htm

Sounds very good!! But like I´ve already said I dunno about any shop who could adjust it properly over here!

[buh_buh]

Originally posted by Veetec
Sounds very good!! But like I´ve already said I dunno about any shop who could adjust it properly over here!

me either. But I'll try to find out.
Thanks for all the info guys.

[supafly1024]

No problem!

[fritz_269]

Originally posted by Veetec
Sounds very good!! But like I´ve already said I dunno about any shop who could adjust it properly over here!

I know they do exist in germany: http://www.tat-rd.com/

Try web searches, yellow pages, asking friends, asking performance part shops, and the best option is to go to car shows and ask around...

A chassis dyno with a wideband O2 sensor & a competent operator is the only way to really get the most out of an A/F controller. Around the states, it's around $100/hr for the service, and with only the A/F controller to adjust, it shouldn't take more than 1 hr. If you get adjustable cam gears too, it might take 2hrs.

Good luck.

[Veetec]

Originally posted by fritz_269

I know they do exist in germany: http://www.tat-rd.com/

Try web searches, yellow pages, asking friends, asking performance part shops, and the best option is to go to car shows and ask around...

A chassis dyno with a wideband O2 sensor & a competent operator is the only way to really get the most out of an A/F controller. Around the states, it's around $100/hr for the service, and with only the A/F controller to adjust, it shouldn't take more than 1 hr. If you get adjustable cam gears too, it might take 2hrs.

Good luck.

Okay! I know of several dynos over here but I thought it had to be adjusted by somebody who knows about it. The problem is that VTEC-controllers aren´t street-legal over here so that nearly all shops don´t have got any experience with it. Or can anybody with a little knowledge about dynos handle that? Is it possible to switch easily between the stock setting and the new setting because of mileage? And about what gain would I see with the VAFC, the cam gears and removed resonator box with a K&N drop-in all together?
Sorry for all these (stupid?) questions but it´s really not easy to modify a Honda over here. Most shops only know how to install headers, exhaust systems, coilovers,..... so I need any info I can get! So thanx a lot for the good info!!!

[Veetec]

Originally posted by supafly1024


Geez, that is a lot of money for a header. You're right, it's not worth it for the money, but if you get an intake and exhaust sometime in the future then the header might just be worth the money if you're trying to squeeze more power out of your engine.

Buh Buh, about adjusting the VTEC engagement point. I've heard that there is no point in putting it any lower than like 4500 RPM, I think I may have heard of people putting it down to 4400 RPM too.

Most shops just want to make money (not dump in some way!) and don´t care much about if parts are really worth their money or not. If I would drive a domestic car most parts would be really cheap and easy to get. But it´s totally different with asian cars! But personally I don´t care much about these facts because my Prelude is a really rare car over here and I don´t need to change thousands of parts to like it. It´s already damn nice stock!!

[supafly1024]

Originally posted by Veetec
Most shops just want to make money (not dump in some way!) and don´t care much about if parts are really worth their money or not. If I would drive a domestic car most parts would be really cheap and easy to get. But it´s totally different with asian cars! But personally I don´t care much about these facts because my Prelude is a really rare car over here and I don´t need to change thousands of parts to like it. It´s already damn nice stock!!

Maybe you should try buying your stuff on the internet and having it shipped to your house. The only thing I haven't ordered on the internet for my car is my wheels. Everything else I ordered online because it's cheaper than any shop around here.

Oh yeah and about switching the VTEC controller from regular stock settings to your adjusted settings, I think you can do that pretty easily. I think you can save your settings and switch between the default settings and your settings by pushing a few buttons. I'm not 100% sure because I don't have one yet but I have done a lot of research on them because I'm thinking of buying one myself.

[Veetec]

Originally posted by supafly1024


Maybe you should try buying your stuff on the internet and having it shipped to your house. The only thing I haven't ordered on the internet for my car is my wheels. Everything else I ordered online because it's cheaper than any shop around here.

Oh yeah and about switching the VTEC controller from regular stock settings to your adjusted settings, I think you can do that pretty easily. I think you can save your settings and switch between the default settings and your settings by pushing a few buttons. I'm not 100% sure because I don't have one yet but I have done a lot of research on them because I'm thinking of buying one myself.

Maybe you´re right! I haven´t tried it yet because it would take several weeks to send the parts from the US to germany.
What have you done to your car yet? Is there anything else I should know about these VAFCs what hasn´t been mentioned yet?

[supafly1024]

Originally posted by Veetec
Maybe you´re right! I haven´t tried it yet because it would take several weeks to send the parts from the US to germany.
What have you done to your car yet? Is there anything else I should know about these VAFCs what hasn´t been mentioned yet?

Yeah, it make take a little while to ship the parts but I think that it would be well worth it when you consider the price difference. If you want to know more about the VAFC click on this link http://www.apexi-usa.com/productdocu...onics_vafc.pdf that should tell you some more about it. As far as what I've done to my car...well as far as performance goes I've put an intake, header, and exhaust on it.