Turbo H22 stock vs. N/A H23 blue top? - Honda Prelude Forum

Duston · 04-12-2009, 11:06 PM

I have a brand new ct 26 supra turbo an intercooler some 550cc precision injectors and hondata s300.

I can turbo a stock block h22 or go with the h23 blue top.

I've heard some pretty nasty things about stock h22 internals and boost, but Im also a big believer that its all in the tune also.

I'd like to hear from some been there done that guys but all opinions are welcome

I can get a h23 blue top for $1800.

I can get a H22 for $1000 then all I need is piping, bov,wastgate and manifold which will put me real close to what a H23 costs.

This will be my daily driver. I'll be running a wideband/street tune.

minilogoguy18 · 04-13-2009, 09:41 AM

A stock H22 on boost being used as a daily driver probably wont be very reliable at all, the rods and cylinder walls are weak. The H23a is a nice choice and you'll get mad props from just about any honda owner just for doing such an uncommon swap, I'd go with the H23a. Oh and I was just on hmotorsonline just the other day and they had the H23a vtec for $1400.

OSOFAST10 · 04-13-2009, 10:00 AM

h23 FTW

mooncaller · 04-13-2009, 11:51 AM

If you're keeping stock internals, from what I've read, the H23 is a better choice.

At the same rate, low boost is your friend, cause stock internals, no matter what don't seem like a good idea above 5 - 7 lbs of boost... if that.

I plan on doing a FI build and have been doing a lot of research recently, and that's just what I've seen.

- Corey

Duston · 04-13-2009, 12:05 PM

Quote:

Originally Posted by minilogoguy18

Oh and I was just on hmotorsonline just the other day and they had the H23a vtec for $1400.

Thanks, JDM engine corp is right down the street.
I'm going to see if I can use the price hmotorsonline to barter a way better deal.If not hmotorsonline will be the route I'll take.

I'm going to be looking for a blown h22 for cheap to rebuild for turbo, but if the dohc h23 lets loose before I get one built it will defiantly be a blue top.

MLBZ521 · 04-13-2009, 02:10 PM

1) The H22 Rods and Cylinder Walls are not weak.

2) A boosted stock block can be reliable, but yes, it is all in the tune -- and in the amount of psi you run.

I believe my friend was running up to 9psi on his completely stock block. And ran this way for quite a while.. I'll see if I can find out more later tonight

You'll need to decide on what you want to do..
If you already have a H23, might as well build that with a H22 Cylinder Head if you want that. It'll be the same thing as the H23A VTEC.

Only reason the H23A1 non-VTEC is more boost friendly is because of lower compression than the H22.

Are you planning on getting a JDM H22? You do know that it has higher compression than a stock USDM H22, correct?

And I'm going to assume the "sohc h23" you mentioned is a typo......

Duston · 04-13-2009, 03:48 PM

yea the sohc was a typo. There's a H22 head on craigslist that Im going to pick up.I'm pretty new to the H series but if I rebuilt my H23 with H22 rods and piston and an h22 head wouldn't I have an h22?

Im on a budget I don't want to get over 2k in the motor. Machine shop would be the only labor charge.

I really don't want to sleeve a motor $$$$ ,but I'm not against block-guards.
What kind of reliable hp can you get out of a non sleeved h23a vtec turbo with a blockguard good pistons and rods and of corse a little lower compression ?

Ive never had a h series apart Im assuming they have block guards for them.

MLBZ521 · 04-15-2009, 02:01 PM

Block Guards are available for OBD2 Blocks.

The H23A1 and H22A1 are closed deck.

You can not run forged pistons in the H-Series, so you're limited on lowering compression.
Which, you wouldn't want to use the H22 Rods/Pistons I wouldn't think then...

You can make 300whp on a stock-like block, but reliable, I dunno.. It'll depend on the PSI.