power gains

[irresistavertible]

Hi All,

Just wondering what sort of gains id be looking at if i fitted my 1999 vtir prelude with exctractors n straight through exhaust?

Looking forward to your replies.

[Luder88]

Hey!

Firstly out of the I/H/E -> Intake/Header/Exhaust mods you'll be doing two of em so might as well upgrade your intake as well.

There will be gains but if you want to bring out the full potential of your basic modifications then you should tune it.

Answering your question, there will be gains in the higher rev range + it will sound meaner =) I'm pretty sure by upgrading your I/H/E it will net around ~10+ kW? Someone please clarify this.

[Int3gra-T]

it all depends on brand etc,.
Headers alone can produce 10kw..
so yeh Budget etc. really depends on how much power you will produce.

[SXC-84K]

Hey!

Firstly out of the I/H/E -> Intake/Header/Exhaust mods you'll be doing two of em so might as well upgrade your intake as well.

There will be gains but if you want to bring out the full potential of your basic modifications then you should tune it.

Answering your question, there will be gains in the higher rev range + it will sound meaner =) I'm pretty sure by upgrading your I/H/E it will net around ~10+ kW? Someone please clarify this.

sup charlay yeh about 10kw atw for the crappy stuff like xforce etc. but if u get good branded and the top stuff ull get alot more gains before the tune and even bigger gains after. eg aem v2 intake approx 6-7kw atw gain not tuned. i also heard the fujitsubo 4-2-1 headers for the bb6 gives a gain of approx 20kw atw without a tune, not sure of exhaust thou, but anything from a 2.25" - 2.5" will be great. also ull need a metal hiflow cat but if u wanna do it illegal just get a test pipe cant go wrong with that :P

[grumpy rooster]

Sorry to rain on your parade mate but there is no way you will get 20kwatw from an exhaust. An exhaust, intake and tune may get you 20kw combined but not singley.

[SXC-84K]

Sorry to rain on your parade mate but there is no way you will get 20kwatw from an exhaust. An exhaust, intake and tune may get you 20kw combined but not singley.

20kw atw was achieved from a member on pa without a tune and his got the dyno results to prove it, cbf searching for it

[Mitchman]

20kw atw was achieved from a member on pa without a tune and his got the dyno results to prove it, cbf searching for it

the PA plots from vics dyno day are something Im not 100% trusting 38kw over stock with I/h/e and a tune is nearly 20kw to high imo. You cant put figures down and just add them together like that, dynos and engines vary way to much to put figures up. Dyno readings are just a number in the end. on paper a turbo car looks unstoppable next to an NA car but on the road things can be much different

[SXC-84K]

the PA plots from vics dyno day are something Im not 100% trusting 38kw over stock with I/h/e and a tune is nearly 20kw to high imo. You cant put figures down and just add them together like that, dynos and engines vary way to much to put figures up. Dyno readings are just a number in the end. on paper a turbo car looks unstoppable next to an NA car but on the road things can be much different

yeh mitch wasnt adding bro, did jono's lude have other mods instead of his fuji headers? didnt take a look of his car

[Juicedboi]

hey i know this isnt to do with the topic but yes i would also like to know wether or not it is worth putting extractos on a 4th gen Si non V-tec. will the performance gain be noticeable? thanks and sorry bout posting a question of my own

[Mitchman]

hard to say.. f's arent the most responsive engines to many mods, headers and a 2.25" exhaust would free the tail end up but i would put on a CAI first.... not sure though sorry.

[boosted_andy]

^ si's are actually a h23a

[JSpec3]

hey i know this isnt to do with the topic but yes i would also like to know wether or not it is worth putting extractos on a 4th gen Si non V-tec. will the performance gain be noticeable? thanks and sorry bout posting a question of my own

Yes you will notice some gains on the h23 but you should upgrade more than just your header if you want better gains.

[Mitchman]

^ si's are actually a h23a

indeedydo! lol is just the base s an f?

[JSpec3]

yes. F series are in the 4gen S model and 5gen Si model.

[Mitchman]

thats offensive... how dare they put that engine in a 5th gen!

[dundas]

lol lol lol

[JSpec3]

thats offensive... how dare they put that engine in a 5th gen!

lol, at least it's DOHC not SOHC like the 4gen.

[Mitchman]

that the difference between the 22a n b?

[JSpec3]

Yeah, 4g f22a SOHC, 5g f22b DOHC. Obviously neither are Vtec.

[_Vtekn_]

Hi All,

Just wondering what sort of gains id be looking at if i fitted my 1999 vtir prelude with exctractors n straight through exhaust?

Looking forward to your replies.

With Intake, headers, and exhaust do spend that extra money.You will see far greater gains.

I can tell you I used to own a 5th gen in which i had full mugen exhaust, mugen headers, injen intake and hondata ecu. I tell you although a bit pricey it was worth it.

Had car tuned on hub dyno with just those mods and achieved 142 kw at front wheels.


Hope that helps!!

[Mitchman]

142kw is rather large number for i/h/e no matter what brand.

[SXC-84K]

yo mitch he said hub dyno he has the figures posted up on PA a while ago when he was selling his car. probly around 125-130 atw

[SeverAMV]

its possible to obtain more than 20kw from headers alone if the design was heavily based on fluid dynamics.

and theres nothing wrong with the f22a single cam motor. Bisi Ezerioha of Bisimoto Engineering america is running one with a pair of carbs, and he manages 380fwhp without turbos or superchargers and a quarter mile time of 9.5 (aside from the carbs, its mostly simple stuff). speaking of which, he's building another one right now for the castrol syntec topshop challenge.
http://www.syntectopshop.com/superstreet-engine-videos/index.html

[migoreng]

my car is fully stock.
what would be better? like as more power per $ if you know what i mean
header or air intake?
i'm not really into cutting a hole into the fender area so a cold air intake is out of the question?

so short ram or headers?

[SXC-84K]

my car is fully stock.
what would be better? like as more power per $ if you know what i mean
header or air intake?
i'm not really into cutting a hole into the fender area so a cold air intake is out of the question?

so short ram or headers?

1. headers give better gains than an intake.
2. get a decent quality header
3. cutting into the fender? WTH? Theres already a hole there from the resonator which u take out, all u have to do really is use a metal grinder and make the hole like 1-2mm bigger for the piping to fit through.
4. SRI is alright but u gota get a pipe from the front bumper up into the intake to feed it "cold air" in which if u get a decent size pipe ull have to make the hole 1-2mm larger anyways or ull suffer heat soak on really hot days without a box covering the pod.
5. if u decide to get a SRI get the AEM v2 best intake for the h22 excluding itbs.

check on PA mate think the v2 intake gained approx 6.5kw atw for a fully stock h22 and the aem v2 was fairly old and hasnt been cleaned

[Mitchman]

its possible to obtain more than 20kw from headers alone if the design was heavily based on fluid dynamics.

and theres nothing wrong with the f22a single cam motor. Bisi Ezerioha of Bisimoto Engineering america is running one with a pair of carbs, and he manages 380fwhp without turbos or superchargers and a quarter mile time of 9.5 (aside from the carbs, its mostly simple stuff). speaking of which, he's building another one right now for the castrol syntec topshop challenge.
http://www.syntectopshop.com/superstreet-engine-videos/index.html

umm... yeah if you can run a methanol 2.4L drag car on the road... in theory D series arent to bad either but.... they are. and to be honest theres not much worse than these engines to use as a base to modify NA unless your going to spend $15k building a Hondzilla. The only good thing working a F block is the factory sleeves.

[SeverAMV]

umm... yeah if you can run a methanol 2.4L drag car on the road... in theory D series arent to bad either but.... they are. and to be honest theres not much worse than these engines to use as a base to modify NA unless your going to spend $15k building a Hondzilla. The only good thing working a F block is the factory sleeves.

actually, i think bisi's using lead based fuels. on his website, he lists nhra and others as the competitions he's entered. on their website, they list the rules for what fuels are allowed and what arent. none of the allowed fuels are oxygenated, therefore no ethanol/methanol blends.
and you dont need to spend 15k. i only spent about 3k engine-wise on my d15b4 for all the engine mods listed on the previous page, and its good bang per buck. i just need better tyres, and need to fit my new carbs and 14s should be possible without any interior stripping.

look up the castrol syntec challenge, bisi mentions that the f22a head outflows the k series and b series heads. he started making a fair chunk of power just by milling the head and decking the block to increase compression.