Corey took his car to the dyno today. I wasn't able to make it since I was out of town.

A comparison between the #3 Prototype Header and #4 and #5 wasn't done today because #3 was at the coaters. Prototypes 1-3 were tested at Rosen Autosports but they are no longer in business. So Corey went to another local shop that had a dynojet.

Just some info on this dyno. I was at this shop this past Saturday to dyno a 4-1 versus a 4-2-1 on a B20. We only dyno'd the 4-1 and compared the graphs to the 4-2-1 that was dyno'd at a different dyno and on a different day (not the best way to do it). The numbers for the 4-1 were about identical to the 4-2-1. I expected better numbers from the 4-1 since it was built more for the B20 than the 4-2-1 header was. So we weren't sure if this dyno was reading a little low or not compared to the dyno used for the 4-2-1. We were hoping it was reading a tad low on Saturday. But after today's results I don't think this dyno could be considered as reading low and after Saturday's results on the B20 I know it wasn't reading high. I hope you all followed that but I can't give out anymore info to make it clearer for confidential reasons.

OK, now for Corey's test results.

I'll post the graph later but these are the numbers for #5 Prototype Header. This is the header that the Production header is going to be based on. The #5 header was run open since the 2-1/2" race exhaust would not bolt up. There is however, enough 2-1/2" tubing to clear the P/S and ATTS units. The #4 header was run with the race exhaust which only consists of some 2-1/2" tubing, 1 18" long resonator and a turn down. Header #5 did slightly better in the low and top end and the #4 header did a tad better in the mid range. There shouldn't be much of a difference between these 2 headers with either exhaust set up.



Engine

H22A4, not sure of the mileage but it came out of a junk yard car.

Mods

*SMSP #5 Prototype 4-2-1 Header (includes enough 2-1/2" tubing to clear P/S and ATTS units)
*CM light weight flywheel
*B&M FPR
* 2-3/4" x 3" CAI tubing with a K&N Filter
* No P/S (edit)
* Underdrive Crank Pulley (edit) this has been on for all 5 headers.
The SAE Numbers are as follows:

RPM Torque HP
4000 138.4 105.4
4200 142.2 113.7
4400 144.9 121.4
4600 141.5 124.0
4800 138.5 126.6
5000 146.3 139.3
5200 153.4 151.9
5400 153.0 157.3
5600 154.0 164.3
5800 155.1 171.3
6000 155.4 177.6
6200 156.3 184.5
6400 156.6 190.9
6600 156.4 196.5
6800 155.0 200.7
7000 152.3 203.0
7200 148.1 203.0
7400 142.9 201.4

To say the least, we are very happy with the results. This weekend's Honda Challenge race should be interesting for H2. Corey should have a very good showing as long as his VTEC stays engaged unlike Summit. It's hard to pull on ITRs with only the low cam.

Modified by SMSP at 6:39 PM 7/30/2003


Modified by SMSP at 12:57 PM 3/13/2004

 

beautiful..... ahhhh $$$

 

nice!!

 

I honestly don't understand how you do it, but damn.
One thing that I am curious about is if you have any idea how much more this header can flow. I'm working on an H23VTEC motor with a minimum of 11:1 cr and cams will definitely be on the To-Do list. What I am wondering is whether you'd recommend a custom job or if you believe that this header will still be very beneficial on a built H22? Obviously the only way to know for sure is to build one of each and dyno it on said car, but you are the expert so your thoughts on this matter would be appreciated seeing as how the H23VTEC build is becoming quite popular.
Edit: spell checck

 

Considering the few mods listed - those numbers seem to be pretty damn good for an H22A4 (usually dyno lower #s or atleast lower tq #s when relatively stock compared to the H22a1) !!!

But I am a relative "noob" so maybe I don't know what I'm talking about but 203 peak HP + 156.6 tq on a relatively stock H22a4!!! NICE!

Also...Torque curve seems relatively flat to my un-trained eye.

I'd like to see a follow-up dyno w/a common aftermarket Muffler.

NICE RESULTS!

PS: how much $$

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeBoyLeRoy &raquo;</TD></TR><TR><TD CLASS="quote">
PS: how much $$ </TD></TR></TABLE>
~$1300 if I remember correctly.
Edit: I didn't remember correctly. $1175 is the actual price.


Modified by laughinxxx at 6:38 PM 7/30/2003

 

dayam! very nice results! awesome work dave.

 

Nice results , make HP up to 7k! (Unlike most H22a's)

 

DAMN those are some nice *** numbers with just those mods.
H22a
SMSP



Modified by SpdFrk at 4:09 AM 7/31/2003

 

wow. even an 'off' dyno wouldnt be off 15hp. seems like these new versions are definately better. great work.

 

got get rid of it.


Modified by kotetu at 7:10 PM 7/31/2003

 

these results are unreal. even if there is a marginal difference, anything close to 200+whp is amazing.

this is sort of making me want to keep my 93 Vtec now. hmmmmm.

 

when is this going into production

 

I cant wait! I am soooo glad i decided to cancel my greddy order, this is one of the best things to happen to the H-series aftermarket!

 

Thanks for doing that.

I've asked sgt to put up run #3 (best of #4 prototype) and run #8 (best of #5 prototype) in his standard format.

The #4 header is what's on the car for this weekends race. It's all stainless steel tubing. Corey tuned the FPR with header #4 and then installed header #5 and made a few runs without any further tuning. Header #5 is mild steel and uncoated.

 

Ask and ye shall recieve:

 

what was coreys baseline hp before any of the prototypes? did he have the stock header or was it aftermarket.

 

I'll ask my newbie question for the day.
Is the diffference between mild and stainless steel purely aesthetic or will the stainless actually hold up longer?

 

IT CLEARS ATTS!!!!!!!!!!!!! WWWOOOOOOOO HOOOOOOOOOOO!!!!!!! time to save $$!!! i need a towel

 

good job Dave. i know we are all looking forward to acquiring one of your masterpieces.

 

I wonder how this header would work for a supercharged application?

 

David,

In this post https://honda-tech.com/zerothread?id=459152 corey mentioned he still has P/S in his car.

edit: then again, that was almost 5 months ago...maybe he's gotten rid of it by now. (note by his sig, he is selling a 4th and 5th gen p/s pump)

Can you tell me how much difference it makes with your header?

thx


Modified by kotetu at 7:12 PM 7/31/2003

 

Awesome results. Man I need to hurry up and get an H22

 

when will the next production line/ list be out. Post the date asap, thanks dave!

 

i'm assumin this clears the accord setups right?...also the better question as i'm sure, everyone wants to know the $$$ for it!!!

looking forward for a set