I Have a CRX with a b16 and a jackson racing supercharger. I am only running 6psi boost right now but i have been thinking about buying a friends b18 block and running an ls vtec and putting on 9 pounds of boost. I have many upgrades on my engine and it is at about 250hp to the wheels but i dont know how much the block would help. I am concerned about the compression, it should lower it which is good, but by how much. And I dont know if the block could handle the extra heat the charger makes. I have heard a lot of horror stories about ls vtec when mixed with boost, can anyone help me out or give me some direction?

 

when you do the ls vtec are you going to change pistons too? if your worried about compression...and want to go with higher boost....go ahead and change those out with forged components and save yourself a lot of headache

 

man you will be ok. all i ask is you use 3 things Cometic 3 layer headgasket, Golden Eagle LS/Vtec conv kit and NuFormz or Golden Eagle blockgaurd. these parts total between a whopping $4-500.

try putting a b16 head with gsr/itr cams on a B20Z block valve clearance is minimal man. with the SC you wont strain the block anymore than you have to the b16 block. one thing you will notice is alot more torque them 1.8,2.0s love the blower and more hp before your current peak.

say you were making 250whp at 7800rpm and 150wtq at 4-5k you'll prolly be 260whp at 7500 and 200tq at 3k. basically i'm trying explain that you'll make more power faster and at lower rpm. which will have less strain on internals. but i know most people who has b16s and then did ls/vtec or b20/vtec and they ring out there motors the same way they did the b16s at 82-8500 and they end up with spun bearings and there pistons have gashes from the valves due to valve clearance and abuse.. the b16s rod to stroke ratio is nice for high revving. the less your motor revs the longer the SC last. heat and rpm kill JR blowers.

 

hey.....whats the rs ratio calculation.....and whats good/bad....i cant find that calculator i used to have bookmarked

 

any pic's of the set up..?

 

Man you probabally have some sweet power right now, only could imagine LS/VTEC

 

If i do this it will probably be on a 1.8 ls block because it is available cheap from a friend, i live in WI so finding blocks around isnt exactly easy. I really want to do some forged slugs because i would know for sure the comp ratio, but the only thing that has me confused is when putting a b16 head on an ls block would that in itself chang the compression ratio to where i would have to get custom pistons, or would i be ok with precut specs from like JE. I have heard a lot about those block gaurds but i am always sketchy as to how they are for the cooling system, for some reason i have always had worries about keeping everything cooled properly since i installed the charger


Modified by cdgcrx91 at 6:38 PM 9/5/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cdgcrx91 &raquo;</TD></TR><TR><TD CLASS="quote">If i do this it will probably be on a 1.8 ls block because it is available cheap from a friend, i live in WI so finding blocks around isnt exactly easy. I really want to do some forged slugs because i would know for sure the comp ratio, but the only thing that has me confused is when putting a b16 head on an ls block would that in itself chang the compression ratio to where i would have to get custom pistons, or would i be ok with precut specs from like JE. I have heard a lot about those block gaurds but i am always sketchy as to how they are for the cooling system, for some reason i have always had worries about keeping everything cooled properly since i installed the charger</TD></TR></TABLE>

i know the b16 head on the b20 keeps around at the cam compression. but the blower loves compression and timing. if you have a 9.6-10.5 c/r that'll be fine dont worry. what you need is a correctly tuned EMS. the only thing you have to worry about cooling issues is the JR blower unit which will overheat from excessive rpm/12+psi without any blower/ic mods.

 

Well I want to invest in the water injection system they have for the chargers because i am not aware of an IC settups i could realy use with this type of blower. For tunning i had planned on converting to obd1 and using a hondata unit. Im trying to get all of my info in place because i will probably order everything i need all at once instead of peice by peice so the more info i have the better, thanks

 

250whp on 6 pounds with a JRSC and a b16... doubtful

 

good luck i hope you really have this engine built or else it wont last long, my buddy had a turboed ls/vtec lasted him 3 months and he is a honda god imo

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rafimos &raquo;</TD></TR><TR><TD CLASS="quote">hey.....whats the rs ratio calculation.....and whats good/bad....i cant find that calculator i used to have bookmarked</TD></TR></TABLE>
http://www.zealautowerks.com

 

along with block gaurd you are going to want to buy some arp rod bolts and maybe some head studs/bolts. but mainly the rod bolts it will help out with the spun bearings and if you are going to do that you should go ahead and buy new bearing since you are in there. but you should be alright with the cr with that block/head set up and for tuning all of my friends from stoughton madison area got to dyno tune there in madison they can help you tune you car and plus he can put in the chip for you so you wont have to send your ecu away.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91civicDXdude &raquo;</TD></TR><TR><TD CLASS="quote">250whp on 6 pounds with a JRSC and a b16... doubtful</TD></TR></TABLE>

The B16A with the JRSC alone is 220-225 BHP. He claims 250 WHP with "a lot" of mods. do these mods include nitrous oxide, and a water injection system?

 

I want this engine to last more than 3 months so i will probably end up building it up. That is actually what i have always heard about ls/vtec engines. but will i have to go as far as sleeving it or anything to run only 12psi of boost? I know arp is a must and some forged slugs.

it ran 247 whp at 7550rpm. I actually paid out the a$$ when it took it to be tunned to make sure they would do the best they could for what i have modified. This including skunk2 stage 2 cams, skunk2 springs and retainers, i picked up new rocker arms from honda and had the head ported and polished by Pakes machining. My dad and i assembled the head and he helped me put the engine all back together. I Have a completely upgraded fuel system besides injectors because there is no reason for them at 6psi. my ignition system has been up graded, i have a light crank pulley and flywheel ran to a drag spool with 14"welds. If you really want to know my whole set-up you can email me at jcjanesville@aol.com and i can send you pics of the set-up and a list of mods. The things i havent messed with are the block because i wasnt sure what i wanted to do yet(thus this post) and water injection(because im not running much boost yet) and nitrous because i dont beleive in spraying on a stock block. check the facts its possible to get a lot of horsepower on only a little boost if you do the right combination of things and know a place that can get power from a cracked out 4cyl

 

skunk2 stage2 cams? thats the reason for the 247whp at such low psi, when you raise the boost on the cams it will actaully make you lose power. try gsr intake and itr exhaust combo for 10-12 psi. also your sleeves should be well enough to 15psi.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cdgcrx91 &raquo;</TD></TR><TR><TD CLASS="quote">I want this engine to last more than 3 months so i will probably end up building it up. That is actually what i have always heard about ls/vtec engines. but will i have to go as far as sleeving it or anything to run only 12psi of boost? I know arp is a must and some forged slugs.

it ran 247 whp at 7550rpm. I actually paid out the a$$ when it took it to be tunned to make sure they would do the best they could for what i have modified. This including skunk2 stage 2 cams, skunk2 springs and retainers, i picked up new rocker arms from honda and had the head ported and polished by Pakes machining. My dad and i assembled the head and he helped me put the engine all back together. I Have a completely upgraded fuel system besides injectors because there is no reason for them at 6psi. my ignition system has been up graded, i have a light crank pulley and flywheel ran to a drag spool with 14"welds. If you really want to know my whole set-up you can email me at jcjanesville@aol.com and i can send you pics of the set-up and a list of mods. The things i havent messed with are the block because i wasnt sure what i wanted to do yet(thus this post) and water injection(because im not running much boost yet) and nitrous because i dont beleive in spraying on a stock block. check the facts its possible to get a lot of horsepower on only a little boost if you do the right combination of things and know a place that can get power from a cracked out 4cyl</TD></TR></TABLE>

 

Right on dude i believe you now that you have elborated more on whats going on. I didn't say it was impossible, just improbable when you just said "a lot of mods".

247 WHP is nothing to complain about, but i suppose you are at that point where you want more than what you have.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cdgcrx91 &raquo;</TD></TR><TR><TD CLASS="quote">know a place that can get power from a cracked out 4cyl</TD></TR></TABLE>

i just noticed this and thought it was funny, nothing on h-t today has made me laugh til now even though this was posted before.

 

Yeah there are good and bad things that come along with being at that point as we all may know. Bad mainly being on the wallet. But yeah when i was getting it tuned the first pull was at like 210-215 and i was suprised at that, but after they messed with it for about 6 hours i was in complete shock when the best pull numbers came through. Its a good feeling, theres a lot of work in that engine im glad its gotten that far, now all i want is more.
Im actually picking up that ls engine tomorrow. It is in better shape than i expected, the guy says it has about 40k miles on it but i wont find out until i tear it down. 500 for the engine and tranny, do you guys think that a fairly good deal?

I Figured the cams would have to go but i have no idea what to use otherwise. Why the gsr intake and itr exaust? I have heard they are good for turbo, but i wasnt sure if they would be as well suited for a charger, i dont know why not but its just somthing i heard.