Is it really in the tune? I want a reliable DD, that's also fun to beat on when the urge arises. I don't plan to push it hard, seeing as the internals are stock (for now). I'm looking for ~250hp to the wheels, maybe a bit more.

Realistically, if everything is done right, I'm sure this could be a nice monster DD. But I'm not sure if I want the thought of, how long it will last, in the back of my mind. I'd have to drive about 6 hours to the closest, competent tuner. I have faith in the tuner's ability.

Motor:
GSR block
LS crank
OEM Ls rods
OEM PR3 pistons

Head:
GSR cams
Ported
Stock valve train

*Roughly 11.6:1 comp*

~250hp on an 18g Greddy kit. Possible?

 

comp is kinda high for a turbo build!

 

It can be done but the compression is pretty high, its going to need a really good tuner that is confident in tuning higher compression setups. and power production is limited because of the high compression and pump gas. 250 shouldnt be a problem though. as far as longevity well depends on the tune. IMO if you built this motor your self pull it and slap in some nippon turbo pistons or stock ls pistons and your good to go for 300-350

 

^+1, but VTEC isn't good for boost IMO.

 

That's what I was thinking. My good friend assembled the motor. Although a good friend, he still charges for work this big. I'm not sure I'd want to pay again to tear down the motor and replace the pistons.

Sometimes I let my thoughts get the best of me. I knew from the beginning that it was going to be a risk. I guess I just need to be reassured.

Thanks for the information.

 

What ? you must have a LS lol

 

lol this guy is funny

 

haha yes i have an LS, but VTEC fights a boosted setup. VTEC is for N/A and the cams have a larger overlap then LS cams. with boost you want less overlap so you dump all the pressure into the cylinder without losing it through the exhaust valves as they're closing. plus a good boosted setup and you won't feel/need VTEC. and if you think i'm wrong look at what the 800hp Honda motors are running

 

you've got 11 post and giving out misinformation.

 

WTF!!!!, lol

 

This is where oversized compressors work with overlap on hondas. They aren't shooting out fresh air, they're using fresh air to push out residual exhaust gases. Every conventional turbo cam designed for a Honda (high lift, low duration) sucks ***** compared to simple ITR cams. Not only that, but you've got intake valves that are 2mm larger in a vtec head. The vast majority of tuners here will also tell you they don't send stock dohc vtec cars out with the cam gears set to dial out overlap.

As far as 800hp motors go, with enough porting and lift any head can flow well, duration or not. I'm not saying your wrong, just not for the motor listed above. I tend to think your race motors have a bit more than just different camshafts.



BTW to the OP: 250 will be easy as hell with that setup. Just a liiitle dangerous. Make sure it's tuned a bit more rich than a "normal" motor. More than likely the piston ringlands will go first before anything else.

 

sorry to jump in just joined site dont no if any one could help. i have 1990 b16 crx vtec just turbo'd got map sensor, fmu, standard ecu runs but over fueling heavly ive also got vafc any ideas on wot ecu in need and any thing i can do till got money for new ecu. any help would be great

 

People rarely mix fmu with vafc. Both are a "hack" in Honda land. Usually you'd use either: A) a properly-set FMU with stock parts & big fuel pump, or B) a vafc+large injectors.

 

 

haha "ok"

 

I thought this guy was joking!

You can run what you have now your tuner just needs to be extra careful. Any detonation on those OEM cast pistons will result in a broken piston ring landing. E85 or higher octane fuel can help you make power a bit safer. Making 250whp will be very easy on almost any turbo. I have seen OEM C5 engines make 350whp+. The best turbo for your current setup will depend on what type of driving will you be doing? auto-x, street/strip, strip, road race, etc ...

 

You're literally too stupid to insult.

 

Sig'd... LOL!

 

LOL ..