I've got 2 H22s.

One is in an EF Civic, with Type-S pistons, no balance shafts and Crower 2A cams and associated valvetrain. This engine uses a stock intake manifold, throttle body, and header. It does have an AEM intake.

The other is in a 5th gen prelude.
It is stock internally, but it has a SMSP header, an Euro-R intake manifold, a ported S2k TB, Type-S intake and AEM pullies.

I finally got around to getting the Neptune RTP in my Prelude tuned.

Roughly $2700 in internal engine parts and labor got me 204 hp and 157 tq in the Civic.
Nearly the same dollar amount (within $200) in modifications and labor only got me 179 horsepower and 132 torque in the Prelude.

It works out that there's nearly a 25 horsepower discrepancy across the board between the Civic and Prelude. This is the same dyno, and while not the same day, that's what SAE corrections are for, and the weather was similar both days.

PS: Don't say the Type-S intake is holding me back. I pulled the airbox off to check, and it only made a (positive) difference between 4700 and 5800 rpm. Above that, it performed just like it did with the airbox on. Below 4700 rpm, there was a huge loss of power.


Now here are the plots!

This is untuned (stock ECU) versus the tune (This is the Prelude). The stock ECU had me running about 12:1 A/F at WOT! I also had to move the VTEC crossover to nearly 5400 RPM to not tank the midrange.



This is the Civic versus the Prelude. I'll let you guys figure out which is which.



And for a EURO-R IM vs Stock manifold comparison (both are running a port-matched and ported S2k TB and a stock P5M ECU)
Red is Euro-R, green is the stock IM.



I wish I had had a chance to tune with both manifolds as I think the power difference would be less dramatic.

 

This is great, two dyno tests of intake manifolds on H22's in the same day! Thanks!

Just to check, the stock vs. euro R dyno is the same engine? ATTS on the prelude?

( https://honda-tech.com/zerothread/1993840 )

 

Same engine, same dyno, about a year apart.

It is a base 5-speed, so no ATTS. Both times the car had the SMSP header.

 

What size exhaust do you have after the header? Or did you dyno with open header?

Your motor should put down around 165whp stock. So picking up 15whp with bolt-ons isn't bad, but is lower than expected.

 

Having an engine that's half and half each of your two setups this is an interesting thread. But I'm very surprised at the difference that S pistons seem to make. (Or maybe the cams as well, despite my own crappy experience with them).

132wtq seems pretty low.

 

How does your dyno compare to readings from a Dynojet?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by A Blue Lude &raquo;</TD></TR><TR><TD CLASS="quote">Having an engine that's half and half each of your two setups this is an interesting thread. But I'm very surprised at the difference that S pistons seem to make. (Or maybe the cams as well, despite my own crappy experience with them).

132wtq seems pretty low.</TD></TR></TABLE>

I made 190 with the stock cams and type-s pistons.

The H loves compression.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sivikvtec &raquo;</TD></TR><TR><TD CLASS="quote">What size exhaust do you have after the header? Or did you dyno with open header?

Your motor should put down around 165whp stock. So picking up 15whp with bolt-ons isn't bad, but is lower than expected. </TD></TR></TABLE>

2.5" high flow cat and exhaust. This dyno puts a stock US H22 in the mid-150s.

 

oh, the dyno just reads low then. those numbers should be just as expected....I would say the equivalent of 190whp on a dynojet.

your other h22 with a stock header must just be a miracle engine.

 

I think somethings up with the preludes power, because if you added it up the civics power is about right on a dynojet, meaning its right on point. Now the preludes power if going by this logic is really off. As even with the PS the SMSP header has shown to still hit mid to high 180s on a stock 5tgen with just a exhaust tuned. I'd expect a little higher numbers with the pulleys, TB, and IM.

 

but he said stock preludes put down mid 150's on that dyno. That about seals the deal. I could definately see 15whp off that header, and 5whp off that IM

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sivikvtec &raquo;</TD></TR><TR><TD CLASS="quote">but he said stock preludes put down mid 150's on that dyno. That about seals the deal. I could definately see 15whp off that header, and 5whp off that IM</TD></TR></TABLE>

If you look at the last dyno you can see what the Euro-r was good for versus the stock manifold without any tuning.

 

correct. I'm going off that other intake manifold comparison thread where an enlarged TB/euro-R should make 5-7whp.