Ok, well im a boost guy but me and my buddy are building a motor for his rex. We are goin LS-VTEC and I want to know If I can achieve 200whp on all OEM internals. A buddy of mine just dynoed at 172whp and 129lbs tq with the following
ITR pistons
LS rods
Stock crank
All ARP hardware

B16 head with FULL ITR valvetrain
Stock cam gears
Sk2 (old style manifold)
BBK70mm throttle body
2.5 inch intake with filter (his downfall)
310 RC injectors
Greddy headers ( i think another restriction)
2.5 catless straight stainless steel exhaust to a Vibrant muffler

We already have an LS block with CTR pistons, LS rods, and everything else is still stock. We really are striving for 200whp on such a setup keeping all of the internals Honda. Is this possible guys?? Input welcome

 

The CTR pistons will yield too much compression for a boosted setup.

 

This guy hit 219 on cast pistons, maybe he could help you.

https://honda-tech.com/forums/all-motor-naturally-aspirated-44/blox-c-versus-blox-2645256/

 

I am thinking the OP wants ALL OEM honda parts. Possibly even an OEM honda cam since he mentioned all ITR valvetrain.

What did the omniman B16 do ? I think I remember seeing it hit 200 whp.
-Chuong

 

Reading is fundamental...He is using the CTR pistons for his friends all motor build.

 

Thank you. Lol We are shooting for 200whp. Bolt on's would include a Skunk 2 intake manifold, Hytech headers, BBK or Skunk 2 75mm throttle body, DSM 450's, 2.5 or 3 inch exhaust catless to a Vibrant muffler, a 3 inch CAI with a velocity stack for some more top end what do you guys think of this??/

 

That throttle body is too large...a 200whp motor won't need nearly that much air. 2.5 should be sufficient for the exhaust. What kind of cams are you planning on running?

 

drop t-body size down to 65mm , go with a set of rs type r replicas mill the head a dash that should get u close to your goal with type r cams

 

making 200 whp with the lsvtec is not hard just need the right parts and put together correctly. ctr or itr cams are enough to make that much power

 

Well Im going to go with a 70mm for a t.b then and I will be using ITR's for cams and the best flowing headers I can find for a decent price without spending 1,500

 

Sort of - you can do it with all OEM parts except the valve train. You will need bigger cams than CTRs to be certain of hitting 200whp. Also, don't use the CTR pistons. They have some fundamental issues - high dome interferes with flame front, not enough room for big cams and (probably) higher compression than you want in a daily driver on 93 octane. If you really want to use OEM slugs, stick with ITRs.

Best of luck with your build.

 

I was thinking of ITR's but the block came with CTR's so I said why not, we'll build another block after it's all together

 

I did a motor using p30 pistons in a lsvtec using itr cams. skunk2 pro manifold. a junk header. tuned it made 198whp at 8krpm. rev limit was 8k rpm. the motor had a lot more but the customer did not want to rev it any higher.

 

YES you can. I was at 182/134 on a dynojet with ITR cams. I now have my new SMSP header and 2.5" exhaust with a Vibrant muffler on it. I will soon have it dyno'd to see where I'm at now. I just got the car back yesterday and it went from a bit on the rich side to a bit on the lean side now. Need to get it tuned ASAP.
I expect to come up a little short of 200whp but I'm not finished yet. The last step will be a 3" CAI custom for a GSR with IAT relocation and V-Stack.
OH I have 100% OEM internals and am still running a GSR intake manifold. I am running USDM ITR pistons. I'm hoping to break the 200whp mark with the GSR manifold.
Over the last year a newer target has emerged, 140tq out of a 1.8ltr.
Good luck with your build. I won't be cheap or easy but it can be done.

 

Interesting to see no plan for headwork ie porting.
Unless your just trying to stay stock oem port?

Im using all oem parts with a gsr crank, some headwork from CC and im at 182 to tire.
Thats a reference with a flattened header full exhaust and almost 100 deg shop temps.

With the 89mm crank some headwork ,the listed mods and a good tune I really dont see "200" being too far out of reach for you guys.

 

Oh I did forget to mention headwork but yes that will be in the numbers as well. Not sure how extreme we want to go yet but we'll get to it when the time comes. I wasn't sure of the numbers because of the power my boy made but those numbers 172whp 129tq were with the restricion of the filter on the intake an only running a 2.5 inch intake as well as not having adjustable cam gears and having ****ed plugs and wires

 

the build wasnt anything crazy, but it was done right with the right combination of parts. it made a lil over 200whp because they were at a dyno that read very low and the numbers were astonishingly high, i wanna say it would have been closer to 210, i cant remember its been a while since i watched it.
the head was professionally ported and the combustion chambers re-worked. the bottom end was stock except for retanging the rods to fit gsr bearings and the valve recesses in the pistons were opened opened a lil bit. the rest was proper assembly/ proper bearing and ring sizing and technique.

made me realize how important the lil stuff is and why everyone's numbers vary so much even if the major parts in the build are all similar.

 

hmm....very intersting