Engine: ITR block-IB spec Wiseco 81.5mm pistons ~11.5:1 compression. AEBS intake manifold, custom intake, RPM 70-66mm TB, Toda 'C' cams, stock ITR head, stock ITR cat back, Hondata. Engine was originally tuned with the Comptech 4-2-1 race header (some would argue it's a Hytech knock-off). Got the Hytech ITR header and bolted it up with no other changes. Graphs are almost identical (red=Comptech, Blue=Hytech) :





Then we pulled the power steering belt to what kind of gains it would yield:






Nice gains for 2 minutes work.


The headers:



I have been told that Comptech no longer sells this header due to the Hytech patent. Other than the lack of Hytech's anti-reversion chambers and the o2 sensor placement, the Comptech piece is almost a carbon copy.

 

So the Comptech has more power?

 

Nice graph Todd!

218 whp for a true 1.8L motor..

Whats up with the coupe?

Jason

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bbasso &raquo;</TD></TR><TR><TD CLASS="quote">So the Comptech has more power?</TD></TR></TABLE>
Comptech showed about 1-2 more hp in parts of the graph, but it's tough to say if it was the header, or just due to a change in conditions. The Comptech was dynoed about a month ago.

Jason: the coupe is together and dynoed well. We are making a couple of changes and going back sometime next week.

 

So you just bolted up the hytech header and tested it without any tuning correct? Im pretty sure the hytech header would have made abit more power with tuning.

Regardless those are good numbers

 

Not for nothing but, my plain jane Comptech 4-2-1 coupled with an AEM cai put down 171 hp.

Nice numbers guy!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SpdFrk &raquo;</TD></TR><TR><TD CLASS="quote">So you just bolted up the hytech header and tested it without any tuning correct? Im pretty sure the hytech header would have made abit more power with tuning.

Regardless those are good numbers </TD></TR></TABLE>
The A/F graphs are right on for both headers, almost identical.

 

Almost 220whp with the stock catback! Damn!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jond &raquo;</TD></TR><TR><TD CLASS="quote">Almost 220whp with the stock catback! Damn!

</TD></TR></TABLE>
Dynapack dyno. More like ~ 205 on a DynoJet.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">
Dynapack dyno. More like ~ 205 on a DynoJet.</TD></TR></TABLE>

thats almost identical to what I was putting down with my JUN3s and stock exhaust

nothing beats nice fat power curve and the quietness of the stock cat

I noticed nice gains as well when removing my P/S belt, easiest mod ever

 

Which comptech header is this?

 

Although the A/F Ratios are just about identical, I"d say it is very hard to draw any conclusions about this comparison. If you tuned both, it might be different, i dont know for sure. I'm also not sure if your tuner (or you, or whoever tuned) was tuning for power or for A/F ratio or what.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SamC &raquo;</TD></TR><TR><TD CLASS="quote">Which comptech header is this? </TD></TR></TABLE>

Their full race header. It`s a very nice piece.

 

good #'s

 

I'm rocking the competch race header and hytech full exhaust w/ test pipe......Damn what a difference from my old setup jdm itr 4-1 and apex-i N1.....Thats tight I didn't have to pay 1200.00

 

Any confirmation of the comptech peice being discontinued? From the pics, it still looks a tad bit different but pretty obvious that is a copy.

Church automotive testing

 

Comptech race header =

Be careful with ground clearance, that thing is low! I loved mine until I smacked it flat.

 

Would it make sense to just get the header first and then get the exhaust at another time when I can afford it?

 

I've got one of these CT race headers on my hatch, I like it a lot, although of course it does hang a good bit lower than stock. I wonder if the dents add power...

 

nice #'s , im amaze more at your tq #'s wow!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">
I have been told that Comptech no longer sells this header due to the Hytech patent. Other than the lack of Hytech's anti-reversion chambers and the o2 sensor placement, the Comptech piece is almost a carbon copy.
</TD></TR></TABLE>


Yeah, I remember John Grudynski was about to start some serious litigation after they stole his design right off Austin's car.

But I must note that the comptech piece isn't an exact copy - it's inferior due to the lack of ground clearance. Hytech &gt; Comptech there.

Also, the hytech anti-reversion chambers while not showing much for WOT dyno comparisons do actually have an effect on the circuit - on/ off throttle manouvres are much more responsive...

Two great reasons to go with transformers over go-bots!

I'd love to see b19coupe test a toda header on that exact same motor.....

FWIW, I'd like to know where your vtec crossover is. It looks like it's around the 5600 range and if so, I'd suggest going higher to 6200+... looks like that dip can be fixed and more power can be made in that range...

Unless that weird hump is from your intake resonance.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Black R &raquo;</TD></TR><TR><TD CLASS="quote">Also, the Hytech anti-reversion chambers while not showing much for WOT dyno comparisons do actually have an effect on the circuit - on/ off throttle manouvres are much more responsive... </TD></TR></TABLE>

Part throttle does "feel" better with the Hytech header, but the butt dyno is notoriously unreliable.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote"> I'd love to see b19coupe test a toda header on that exact same motor..... </TD></TR></TABLE>

Me too

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">FWIW, I'd like to know where your vtec crossover is. It looks like it's around the 5600 range and if so, I'd suggest going higher to 6200+... looks like that dip can be fixed and more power can be made in that range...

Unless that weird hump is from your intake resonance..... </TD></TR></TABLE>

VTEC is at 7267.
That hump is the intake resonance of Shawn's "magic" intake.

 

That numbers are power and tourqe at the flywheel

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">
Dynapack dyno. More like ~ 205 on a DynoJet.</TD></TR></TABLE>

it clearly states on the dyno graph FLYWHEEL power.

 

It actually measures power at the hubs.