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Author Topic: H Series Beginners' Basic Info 101  (Read 12875 times)
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TopEndLude
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« on: December 26, 2006, 11:10:26 pm »

Prelude and Accord engines

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Prelude Type S
Factory port and polish job from factory. 11:1 compression and has ATTS (active torque transfer system).

http://asia.vtec.net/beystock/honda/preludes/

Prelude SIR S spec:

Same engine as the the Prelude Type S. The only difference is that it has a true LSD that is torque sensitive.
Tranny code: T2W4
P13 ECU with different programming than the regular jdm h22's
for more info visit
http://asia.vtec.net/article/CF4/


Here is the site that will tell you everything about the type s and the sir spec s. Ofcourse you'll need to translate the site to better read and understand the information.
http://www.honda.co.jp/PRELUDE/2000/

H23a vtec Accord Wagon
http://english.auto.vl.ru/catalog/11619/

200 ps (147.10 kw) / 6800 rpm which translates to 197hp
22.5 kg*m (220.65 N*m) / 5300 rpm translates to 163ft/tq
also look at the bore and the stroke. It redlines at 7200rpms.
As a side note: The accord that this engine is in has the same tiptronic transmission as the automatic fifth gen preludes.

F20B

Believe or not it has the same head as the type s and sir spec s. It does not share the frm sleeves as the h series. it has iron sleeves. Iron sleeves make it easier to bore out.

The bore is 85mm and the stroke is 88mm.

Now there is a catch to this motor. The automatic S shift accords that have this engine only have a 180hp because the tranny cant take too much load. But check this out... its the same auto tranny that comes in the NSX. Hmmm... The manual accords came with 200hp and 147ft/tq. But the trims has the same engine. So how come one was rated higher than the other? It's very simple. The ECU has to be different.

http://asia.vtec.net/article/CF4/
http://world.honda.com/news/1997/4970904.html

Now that we've discussed the blue tops. Well what's different? Absolutely nothing but the engine codes and the ecu's that are used. The F20b is the same as a h22 and h23a vtec. It's just a lesser bore than it's counter parts. Don't let the engine code fool you. It's H when it boils down to it.


Euro R h22

Single runner intake manifold. hence it makes the same power as the h22 type s.

Now for the difference between the Red Tops.

Prelude SIR Spec S and Prelude Type S is the exact same engines. The difference is that the Type S as ATTS instead of an always working LSD That the SIR Spec S does.

The Euro R Accord also gets a true LSD from factory but gets a little better gearing than the SIR Spec S. All H22 have the same final drive of 4.266 however.

ECU's

I'll start off with some basics

92-96 Preludes have a P13 ecu. Both in The U.S. and Japan.
97-01 Preludes have a P5P ecu. Both in the U.S. and Japan.
96-2001 Prelude SIR Spec S has a P13 ecu.  It is different from the p13 ecus that came in the forth gen and other jdm preludes however.  It's programmed for the factory built head etc etc...

h22a OBDI ecu is a P13 ecu
h22a OBDII ecus are P5P and P5S (if I remember correctly the P5S ecu is from the H23 EUDM obd2 accord and the prelude type s).


The Prelude SI that have H23 in them have a P14 ECU; and cannot be used with a vtec engine. So if you have a prelude SI and you've done or planning a h22 swap you need to get the p13 ecu. The P14 will not work.


Now for other options. There are some of you (most if not all) that when you do an engine swap you want to get the best bang for your buck with ecus. There are other choices you can consider aswell.

If you have a H22 you can choose from :
P72,P28,P30,P61,P08J,P30J,P72J

If you have a h23 none vtec you can choose from:
P74,P75,P06,PR4,P72,P28,P30,P61,P08J,P30J,P72J

NOTE: These ecus must be chipped with a H22 map in order to work properly with the h22 or h23 ecus. They have way different maps and timing on these ecus are drastically different as well. So running them unchipped is not a good idea.

T.E.L.
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TopEndLude
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« Reply #1 on: January 03, 2007, 09:39:59 pm »

what?  no appreciation?  lol
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sean1121
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« Reply #2 on: January 04, 2007, 08:02:08 am »

Quote from: "TopEndLude"
The Prelude SI that have H23 in them have a P14 ECU; and cannot be used with a vtec engine. So if you have a prelude SI and you've done or planning a h22 swap you need to get the p13 ecu. The P14 will not work.

T.E.L.


Not entirely true, the P14 will run the H22 but vtec won't work.  :cry:
Its probably not a good idea as my H22 ran like crap on the P14 but it can be done.
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TopEndLude
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« Reply #3 on: January 04, 2007, 08:43:43 am »

a p14 can be used with a h22 yes this is true.  But you won't have vtec.  So therefore it cannot be used with h22.
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« Reply #4 on: January 05, 2007, 09:15:33 pm »

enough great info to make a honda lovers head spin.  As always, great post my good man.  An asset to the site for sure.
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elspectro29
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« Reply #5 on: June 27, 2013, 06:19:08 pm »

After doing research on the F20B, I've found that only the manual version has Type-S cams. The auto version has regular H22 cams and is tuned for more mid-range power. Running an auto F20B on an adjusted manual basemap will get you a peak of ~190 HP. I still think it's the most intriguing of the three because it can go in a few different directions.
« Last Edit: June 27, 2013, 06:20:41 pm by elspectro29 » Logged

1991 Si ALB - parts car
1995 Si - wrecked and sold
1993 S - DD
1997 Type SH - traded
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1991 Si - sold
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