suggestions
04-16-2006, 02:41 AM
#1
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suggestions
car is a 1991 JDM nsx,
looking at intake, exhaust/headers and a computer upgrade (NZ fuel is crap so this is important to get any jdm car running good.)
what have people used/suggest using? tryed searching all over the internet but information is hard to find.
We are not brand or JDM ****** just want pratical products that do the job well.
Cheers
Jason
looking at intake, exhaust/headers and a computer upgrade (NZ fuel is crap so this is important to get any jdm car running good.)
what have people used/suggest using? tryed searching all over the internet but information is hard to find.
We are not brand or JDM ****** just want pratical products that do the job well.
Cheers
Jason
04-17-2006, 06:27 AM
#2
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Re: suggestions (chuckles2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chuckles2 »</TD></TR><TR><TD CLASS="quote">car is a 1991 JDM nsx,
looking at intake, exhaust/headers and a computer upgrade (NZ fuel is crap so this is important to get any jdm car running good.)
what have people used/suggest using? tryed searching all over the internet but information is hard to find.
We are not brand or JDM ****** just want pratical products that do the job well.
Cheers
Jason</TD></TR></TABLE>
Intake - it has been proven that aftermarket intake does not create any significant increase in HP unless you are willing to go with indivisual throttle bodies, so stick with OEM unless you want a different look.
Exhaust - It is my opinion that any well made aftermarket exhaust will yield about the same HP gain which is not much by itself. To see a real gain, you should get header in addition to the exhaust. For exhaust pick, it is more about sound preference and weight saving than anything else. There are arrays of exhausts you can pick and you can find more details on http://www.nsxprime.com or find sound bits from http://www.scienceofspeed.com or http://www.daliracing.com etc.
ECU - I don't know what the octane rating of the gas you get in NZ, but if you can only get crappy gas, then there's no point in modifying the ECU which takes advantage of good quality gas by advancing timing and modifying fuel curve.
looking at intake, exhaust/headers and a computer upgrade (NZ fuel is crap so this is important to get any jdm car running good.)
what have people used/suggest using? tryed searching all over the internet but information is hard to find.
We are not brand or JDM ****** just want pratical products that do the job well.
Cheers
Jason</TD></TR></TABLE>
Intake - it has been proven that aftermarket intake does not create any significant increase in HP unless you are willing to go with indivisual throttle bodies, so stick with OEM unless you want a different look.
Exhaust - It is my opinion that any well made aftermarket exhaust will yield about the same HP gain which is not much by itself. To see a real gain, you should get header in addition to the exhaust. For exhaust pick, it is more about sound preference and weight saving than anything else. There are arrays of exhausts you can pick and you can find more details on http://www.nsxprime.com or find sound bits from http://www.scienceofspeed.com or http://www.daliracing.com etc.
ECU - I don't know what the octane rating of the gas you get in NZ, but if you can only get crappy gas, then there's no point in modifying the ECU which takes advantage of good quality gas by advancing timing and modifying fuel curve.
04-17-2006, 08:39 AM
#3
Painting Masterpieces
Re: suggestions (chuckles2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chuckles2 »</TD></TR><TR><TD CLASS="quote">looking at intake, exhaust/headers and a computer upgrade </TD></TR></TABLE>
You're looking at +20-24rwhp. This is, IMHO, a must upgrade for the early model NSXs.
Intakes can be pricey. Comptech, http://www.comptechusa.com, makes some good stuff with documentable power increases. Still, a Uni or K&N filter will likely give you close to the same +hp increase. The stock intake is well designed. You may want to look at the Science of Speed Cantrell Air Induction System - also has documentable power increases.
My setup includes the Cantrell system, stock intake, and Uni filter.
Headers can be found at Science of Speed or Comptech. Both the SoS house brand and Comptechs are well made and lighter than stock. Fujitsubo makes headers as well but are $$.
I've got the Comptech headers. Soon to be ceramic coated inside and out.
Exhausts? See above. The market is filled with exhaust manufacturers and brands. The http://www.scienceofspeed.com web site has a plethora of info for reference.
Again, I'd recommend either SoS or Comptech for any ECU replacement. If you're really serious about maximizing performance from the ECU, you may want to think about going to AEM EMS and get it tuned for your individual car.
I run the SoS ECU. It made a bit more hp than stock and is on par with the Dali chip.
Hope that helps!
FWIW, if you chose anything from Dali Racing, make sure it's in stock or you may not ever get it or your money back.
You're looking at +20-24rwhp. This is, IMHO, a must upgrade for the early model NSXs.
Intakes can be pricey. Comptech, http://www.comptechusa.com, makes some good stuff with documentable power increases. Still, a Uni or K&N filter will likely give you close to the same +hp increase. The stock intake is well designed. You may want to look at the Science of Speed Cantrell Air Induction System - also has documentable power increases.
My setup includes the Cantrell system, stock intake, and Uni filter.
Headers can be found at Science of Speed or Comptech. Both the SoS house brand and Comptechs are well made and lighter than stock. Fujitsubo makes headers as well but are $$.
I've got the Comptech headers. Soon to be ceramic coated inside and out.
Exhausts? See above. The market is filled with exhaust manufacturers and brands. The http://www.scienceofspeed.com web site has a plethora of info for reference.
Again, I'd recommend either SoS or Comptech for any ECU replacement. If you're really serious about maximizing performance from the ECU, you may want to think about going to AEM EMS and get it tuned for your individual car.
I run the SoS ECU. It made a bit more hp than stock and is on par with the Dali chip.
Hope that helps!
FWIW, if you chose anything from Dali Racing, make sure it's in stock or you may not ever get it or your money back.
04-18-2006, 07:07 AM
#4
H-T Order of Merit
Re: suggestions (chuckles2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chuckles2 »</TD></TR><TR><TD CLASS="quote">what have people used/suggest using? tryed searching all over the internet but information is hard to find.</TD></TR></TABLE>
Sounds like you haven't searched the FAQ or forums on NSXprime...
Sounds like you haven't searched the FAQ or forums on NSXprime...
04-18-2006, 05:58 PM
#5
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Re: suggestions (nsxtasy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxtasy »</TD></TR><TR><TD CLASS="quote">
Sounds like you haven't searched...</TD></TR></TABLE>
Well, I don't know if I can add anything as useful as this, but I will try to give you some practical advice based on building several NSXs.
Frist, with your '91, the single most important upgrade you can do is to add a good set of headers. The factory exhaust manifolds on the early models are pretty lame (and heavy). Any of the better brand headers will work fine. Try Comptech or Science of Speed. Avoid DC, as theirs is of lower quality construction IMHO. Use stainless steel ones so that you don't need to mess with ceramic coating (ss doesn't corrode and already provides a very high thermal barrier).
The factory exhaust (from the cats back) is not nearly the restriction that the exhaust manifolds are, but you can pick up a couple of hp and save a few pounds if you go aftermarket.
You are going to get a lot of opinions on intakes, but in my experience (based on dyno numbers) you will do pretty well with a simple aftermarket scoop (like the Cantrel) that fits in the side scoop and replaces the convoluted factory snorkel, combined with a good high-flow airfiler like the Uni that Ponyboy suggested. In fact, most of his advice is right on.
For the ECU, I highly recommend the AEM unit for a '91 car unless you can get an F-CON for a lot less. It will work fine, but if the price is close, I think you are better off with the AEM. The simple piggy-back type controllers like the Apex AFC are fine for most situations, but if your gas quality is an issue, you need something that will let you pull timing if you have to. Both the AEM and the F-CON will do that. If timming does not turn out to be an issue, the piggy-back units are fine for bolt-on mods. I have picked up ten hp on the dyno with an AFC. Also, with an AFC, you might have to re-set the ECU every once in while because it may try to 'learn' and compensate. That is more of an issue on later (OBD2) cars, though. If your car is not pinging stock on the local gas when you drive it hard and the engine is hot, the bolt-on mods should not change that. You will just need to add fuel to compensate.
Afterthat, assuming from your original post that you do not plan to go FI, the next big step is head work. That is a bit of a chore in the nsx as you need to pull the motor to get to the heads. I can drop the motor and have the heads off in about 4 hours, but the first time you do it, it will take all day (at least). A good port and polish and some big cams can really liven up the motor if you also have the means to tune it properly. Even if you don't work the heads, you might want to port out the intake manifold.
Good luck with your project.
Sounds like you haven't searched...</TD></TR></TABLE>
Well, I don't know if I can add anything as useful as this, but I will try to give you some practical advice based on building several NSXs.
Frist, with your '91, the single most important upgrade you can do is to add a good set of headers. The factory exhaust manifolds on the early models are pretty lame (and heavy). Any of the better brand headers will work fine. Try Comptech or Science of Speed. Avoid DC, as theirs is of lower quality construction IMHO. Use stainless steel ones so that you don't need to mess with ceramic coating (ss doesn't corrode and already provides a very high thermal barrier).
The factory exhaust (from the cats back) is not nearly the restriction that the exhaust manifolds are, but you can pick up a couple of hp and save a few pounds if you go aftermarket.
You are going to get a lot of opinions on intakes, but in my experience (based on dyno numbers) you will do pretty well with a simple aftermarket scoop (like the Cantrel) that fits in the side scoop and replaces the convoluted factory snorkel, combined with a good high-flow airfiler like the Uni that Ponyboy suggested. In fact, most of his advice is right on.
For the ECU, I highly recommend the AEM unit for a '91 car unless you can get an F-CON for a lot less. It will work fine, but if the price is close, I think you are better off with the AEM. The simple piggy-back type controllers like the Apex AFC are fine for most situations, but if your gas quality is an issue, you need something that will let you pull timing if you have to. Both the AEM and the F-CON will do that. If timming does not turn out to be an issue, the piggy-back units are fine for bolt-on mods. I have picked up ten hp on the dyno with an AFC. Also, with an AFC, you might have to re-set the ECU every once in while because it may try to 'learn' and compensate. That is more of an issue on later (OBD2) cars, though. If your car is not pinging stock on the local gas when you drive it hard and the engine is hot, the bolt-on mods should not change that. You will just need to add fuel to compensate.
Afterthat, assuming from your original post that you do not plan to go FI, the next big step is head work. That is a bit of a chore in the nsx as you need to pull the motor to get to the heads. I can drop the motor and have the heads off in about 4 hours, but the first time you do it, it will take all day (at least). A good port and polish and some big cams can really liven up the motor if you also have the means to tune it properly. Even if you don't work the heads, you might want to port out the intake manifold.
Good luck with your project.
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