I helped a friend build a b20vtec from a 98 b20b block and a 95 integra gsr head.

Here is what i know about the build:

- Notched pistons with a dremel.. measured 1mm all around
- Golden eagle conversion kit
- stock b20b water pump and timing belt
- B&M fuel pressure regulator
- Golden eagle head studs
- 95 gsr head .. stock
- 98 crv b20b block .. stock
- obd1 p72 gsr ecu
- Generic short ram intake

We put it all together correctly, but the thing feels like a dog.. You can barely hear the vtec changeover and you cant even feel it at all.. It is like the vtec is clicking but not engaging. It almost feels slower than before the conversion.. it feels like something is retarded because it is soooo slow.

Any suggestions to what may be the cause of the problem?

 

what car is it in?????? you need to get it to a tuner....

any CELs???

 

it is in an ek hatch... and no cel's.. it should run fine on a stock ecu... i mean this thing is slooooow .. im thinking his butterflies are shut somehow...

 

hold open the butterflies with some tie straps and see if that helps any...

low end will suck even more but atleast you can se if the top end opens up a little...

BTW..have you done a compression test?

 

What kind of tranny does it have? My friends LS-Vtec felt like **** with the LS tranny until he got an SI. Night and day difference. Oh and to leave the butterflies open just take of the vacuum. Check the oil pressure also.

 

yeah... im thinking oil presure may have something to do with it. im also thinking it may be cam timing... like maybe one of the cam gears is off a little.... im going to check that out today

 

Yeah, if your timing is off it will be a total dog. just zap it with a timing light and you'll know.

 

im hearing things about not using the b20 timing belt and water pump because of some timing/teeth problem.. so im guessing that is more than likely the culprit. Other than that there is now a code 22 and the car is bogging horribly. Im thinking we got a bad head from the guy that sold it to us.

 

22* Accord Civic CRV CRX Del Sol Odyssey Prelude
94-98 92-98 n/a n/a 93-97 98 93-98`
VTEC Oil Pressure Switch
defective circuit or unplugged / defective oil pressure switch
* not a valid code if car does not have a VTEC engine

 

sounds like timing to me.

 

your car runs like a turd cuz you have not tuned it. This happened to some guy around here i know and suggested hondata or some type of management and he installed got tuned with neptune and car ran really strong after that. look into it.

 

hmmm... yeah.. i think it would at least run faster than my old gsr integra that i had but it feels slower to me.. ive seen people run stock b20vtec setups and be pretty decently quick.. right now it feels like a single cam vtec... if not worse.

 

OK. so we did some investigating... and re-did the wiring to make sure it was correct... and with a new clip and a different oil pressure ground that cel went away, but then the map sensor cel came on.. so we changed that out.. and it started right up with no cel and a nice smooth idle... yay...

We drove it, and it was hitting vtec, but not really strong. Went to a gas station, put some 91 in the tank and vtec started hitting pretty nice on the way back to the house. This was on a prelude p13 ecu.. we put the gsr ecu back in ( we thought it migh have been the ecu so we switched it out ) and took it down the street again... that went ok and vtec hit nice with that ecu also. It still feels like some sort of timing is retarded... it is weird. But i talked him into getting hondata and hopefully all issues will be worked out on the dyno.

Any suggestions as to how to make it run better without hondata??

 

i think something is still wrong. A stock b20/vtec should be able to pull hard well atleast harder then before on an EK. what tranny are you using?

 

gsr trans with lsd......... i think something isnt right either.. but i have no clue as to what it is.

 

that compression is really low, like 9.4 9.5 that could be one of the problems


i had a h23vtec and it felt pretty slow due to the lack of compression

what do u have feeding the head for oil?

 

the golden eagle ls/b20 vtec kit.

 

thats a good kit i like mine, i would say do a compression test and go from there

it could be tuning but i know the feeling of building something and the power not being there, my h23vtec was pretty much a dog,

you prob need to upgrade the pistons

 

hahah yeah... 8.8:1 with notched pistons and a gsr head should only be 9.2:1 or lower due to the notching.. BUT ... the thing that worries me is that it is slower than the b20 was before... so i know there is something wrong.. im guessing it is just tuning though.

 

I just did a valve adjustment and tried a b16 ecu and things are looking up.. Im getting a p28 and hondata to fine tune everything...

 

well usually as a rule of thumb to build lsvtecs you want to use a GSR water pump an ITR/gsr oil pump and a GSR timing belt, so that all the teeth will be matched up correctly. B20vtecs have a little more involved with them besides slapping on a vtec head with a conversion kit and calling it a day.

If you guys have any more questions try hitting up http://www.b20vtec.com

 

^^ what he said, i'd look into the pumps and timing belt

 

Well from what I understand....

All obd2 b-series oil pumps are the same. The gsr and b20 share the same part number.

All b-series share the same cam sprockets

If you use a b20 water pump use a b20 timing belt, if using a gsr pump then use the gsr belt because the pump has more teeth.

So right now we used the b20 water pump and the b20 timing belt. It is a 98 b20b motor so all the oil stuff is handled.

Am i correct?

Im thinking it is heavily related to tuning because with different ecu's there are night and day differences in performance. But im going to definately check that site out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DJ_NeX &raquo;</TD></TR><TR><TD CLASS="quote">B20vtecs have a little more involved with them besides slapping on a vtec head with a conversion kit and calling it a day.[/url]</TD></TR></TABLE>

i agree with this guy.. frankenstein motors can be ur best friend or ur worst enemy...

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMH22EJ &raquo;</TD></TR><TR><TD CLASS="quote"> right now it feels like a single cam vtec... if not worse.</TD></TR></TABLE>

damn.. must suck to be u...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by solfood &raquo;</TD></TR><TR><TD CLASS="quote">damn.. must suck to be u... </TD></TR></TABLE>

HAHAHAHAHAHAHAHA!!! Yeah.. it kinda does... but things are looking better, and it seems to only be tuning.