because the IR revs higher and can carry the torque higher in the rpms so therefore by being able to rev higher and being able to carry the torque higher it will make more power and torque. show me a ITR that revs to 7200 (stock ls rev limiter) and makes 116whp (like a stock ls will) and makes as much torque.
Its hard to say because I don’t baby my car. When I had the LS setup, it made over 300whp and it had 450cc injectors, with my LS/VTEC I have 750cc injectors but my gas mileage was better then my LS and they where both tuned under the same principals. My LS chewed more fuel because of the JG 1001 cams I had in it with and cam gear adjustment of the intake advanced 2 and the exh retarded 1. So it had a bit of a lope to the idle. The LS/VTEC has stock GSR cams and acts and sounds just like a stock GSR.
Blackknight-hey MIKE, which one do you prefer? besides gas mileage, what would you build if you had to do it all over? ls or lsv. And how long have you had a lsvtec setup? I can’t make up my mind on what motor to build. I just know I don’t want a b16lol.
That would soley depend on your budget and hp goals. You can not lose with either of them. i personally like the vtec since I changed over but the LS can make you very happy aswell. The vtec just gives more with all components being the same between to 2. 300whp can easily be done with both engines being stock. So its really a coin toss as to what your perference is. But I will tell you one thing tho. My boy on this site nas-t-nos has always bigged up the B16A motor to me and never really payed it much attention. Until I hurt my LS/VTEC motor one night being greedy. So I put in my bone stock wreckers motor (B16) with my existing turbo kit. The only mod I have done to it was ARP head studs and GSR cams. I run 15psi daily on this complete stock block with my SC61 and 750cc injectors. This motor has been in my car since the begining of summer. And I have tried to blow it up purposely to test its limits with a excellent tune. I couldn’t. I raced this motor like I stole it. Probably over 60 hard passes since the summer time. It hasn’t skipped a beat. I have bounced off of rev limiter countless amounts of time too. It is still in my car today with the same setup, only with stock injectors for the winter (no more boosting until the weather gets better). And it doesn’t burn a drop of oil. I am so impressed with this motor. I have beaten some of my buddies that have run 12.20 at the track at 112mph with ease on the roll. This setup has to be making 330 to 360whp at that level in my 3000pound Teg with me in it. I love this motor. The turbo that I choosed to run with this motor gives it all the torque I could ever want at this level. Anything else would be overkill on my street tires because traction alone is bad as is. The long and short is any B SERIES motor with a turbo is bad ass period. Lots of people want big numbers with their turbo setups. But 300whp on a daily driver is flippin quick and a peace of work to handle if you don’t got good tires. Thats my story and I am sticking to it.
Good info MIKE…
civicflnum1 - you are just controdicting what info you gave the thread starter. You told him not to go Ls/Vtec b/c his torque numbers will drop. But you said that the ITR can rev higher and carry the the torque higher in the rpm’s. Hence, Ls/Vtec…the ability to rev higher and carry your numbers into higher rpm’s, meaning more power…that would be the way to go it sounds like to me…
Anyway, this has gotten way off subject. My apologies again… I’m done…
Where torque is conerned. Don’t worry about it. B18A/B, B16A/B, B18C/4 as long as its turbocharged the turbo will make good torque regardless. If its a race car your building then get a B18A/B motor and sleeve it for 84.5mm. For a street car don’t get hooked on huge amounts of torque unless you drive your car with a slick all the time. Torque is the end all be all for N/A. With turbo as long as you make decent whp you will make decent torque aswell. They go hand in hand. For example, have you ever seen a turboed Bseries make 300whp and 160 torque? Its not common. Not even for D series motors. I think alot of people are blinded by dyno numbers (no jabs intended guys, just a over all generalization). Peak numbers mean sqwat. No dyno can simlulate actual air hitting the front of your car, and a 1/4mile pass doesn’t start in 4th gear at a one to one gear ratio either. Average power throughout your powerband is way more important then a peak number in 4th gear. Dyno’s are ball park figures, not the gospel. Its just ball parks your air/fuel ratio, then real tuning begins at the track where the mph indicates your true hp along with the weight of your car with you in it.
i was refering to a stock motor. on a boosted motor the itr head flows more mass while the ls head has more velocity. therefore the itr will make more power because the head flows better but the ls will make more torque. for a boosted stock block i would go ls for a built block i would go ls/vtec. (i have a built ls vtec :))
Me personnaly would take vtec or ls/vtec over the ls anyday. The reason why is because I hate torque. Just like mike said unless ur racing at the track torque means nothin b/c u will not hook. When my 91 prelude was turbo I got a dose of knowledge. Had a small basic t3 turbo that gave me ample amounts of torque. Couldnt stand it b/c I would never gain traction. Why race when ur turbo teg will do nothing but spin. Thats why i went to a bigger turbo like the t3/t4. LS/Vtec does give you alot of torque. For one when building the frank… the compression bounces up to 9:8:1. Over all it depends on what you want. My opinion is the aftermarket clucth is like torque to me cause it gives you a nice jump. Plus when u race, what rpms are u spending most of ur time in?? 5-6-7…which to me means I want a turbo thats going to pull hard as hell in those rpms.
thats my 2 cent
Couldn’t agree more…for more info check out www.importbuilders.com aka IB Spec…They have a very good write up on a good boost build…they to discuss the torque problem on the street and track…
thanks for replies, I’ll figure out what I’m going to do very soon. It’s ls or gsr at the moment, but I do have a ls block and gsr head. I might try to build both with the gsr fully built and a mildly built ls. Money is an issue, but I’ll have patience if need be. I’ve been researching the torque theory and I do agree. A b16 is made to rev like no other and that’s why siccgsr decided to build one, but I would like to have a gsr. The vtec stuff just costs alot compared to a ls. I would be driving daily and by the time I build a ls I could’ve just built a gsr. I’m planning on building this motor for top end power, not commuting and that’s what’s leaning me towards vtec. I’ve seen some built b18b’s run real good top end with cams though. With the same money I could just have vtec.
for turbo, vtec is just extra bling. 400-500 ls whp not good enough for you? 