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ls/vtec with Nitrous or Boost?

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Old Jun 24, 2003 | 12:43 AM
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Default ls/vtec with Nitrous or Boost?

Just trying to decide what to do at this moment. Of course the turbo route is going to make more power but also a little more expensive.

Turbo setup:
LS block, Wiseco (9.2:1), ls rods, b16 head, gsr cams, itr intake manifold, Maxrev kit (T3/T4e 57 trim with .63A/R), 12-14psi
3bar map with Hondata. Power would be great but how streetable would it really be? Although, I think someone hear ran a 12.6 or so on drag radials....yes that blue Si. But traction would be a big issue for a daily driver and more maintance. However, it's very tempting looking at the Maxrev kit in my room.

Nitrous setup:
LS block, higher compression (~11.5:1 forged pistons), ls rods, arp rod bolts, Skunk2 Stage 2 cams (itr/portflow valve springs), itr intake manifold, some sort of 4-1 header (JDM DC or itr), zex kit with a 50 shot. Less maintance since I won't really use the nitrous on the streets, good powerband for a daily driver with decent traction. How many people have a nitrous setup that's pushing over 220whp (4 cyclinders)?


Goals: High 12s on drag radial or maybe slicks. Just mid to low 13s on street tires...yet reliable enough for 120-150 miles a week with little abuse. I don't really take my car over 2500rpm...only once in a while.

I'd like to get opinions from you guys...especially with a nitrous setup that's making some decent power.
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Old Jun 24, 2003 | 12:44 AM
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Oh yeah, this is in a heavy integra with full interior. If it was a lighter eg or ef, I'd have definitely gone with another NA setup.
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Old Jun 24, 2003 | 10:12 AM
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Specie, when did you get rid of the CRX? Anyway, If I were you I would boost it if you have the money. I'm looking into boosting my LS soon. But till I scrounge up the money for a turbo. I'm stuck with my lil 55 shot.

,Rich
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Old Jun 24, 2003 | 11:46 AM
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Rich, I sold the Crx in Feb. Glad to hear your ls motor is still running strong with the spray...how long have you been spraying? Yeah, boost woud be nice but I'm having second thoughs about it...again.

I rarely took my Crx over 2500rpm. Did your friend decide on the Accord motor?
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Old Jun 24, 2003 | 11:59 AM
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Go with Boost! After you experience it, you'll be hooked...

You will have problems with LS/VTEC and RPMs... namely the rod stroke ratio and its subsequent limitations. Remember, power is nothing more than the product of torque and RPM. Hondas make power through high RPMs, not torque. LS/VTEC increses torque, but limits the redline....

I have a similar setup, PM me if you have any questions or need advice. I have been through ALOT of trial and error on a turbo LS/VTEC setup. I have an answer for the rod stroke ratio problem.

What tranny are you going with? You're gonna have a LSD right?

Good luck!
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Last edited by quickcivic; Jun 24, 2003 at 12:03 PM.
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Old Jun 24, 2003 | 12:28 PM
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A while ago, I had a ls longblock in my Crx. I bought a Greddy turbo kit but ditched it to go ls/vtec. I built the motor and it ran for 12k miles w/o any problems. I sold it a few months ago.

I guess your solution is gsr crank/rods in the ls block?

I have a b16 tranny with a ls 5th gear and a CM stage 3 clutch in my car currently. 3" Thermal exhaust on my basically stock ls longblock also....yeah, feels like crap.

Thanks.
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Old Jun 24, 2003 | 12:50 PM
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Specie, It's holding up fine. I'm going on 2 years with the spray. No problems problems so far. But I'm running the smallest shot that came with the kit too. I would have gone Turbo by now. But it's hella expensive. Engine management, turbo kit, internals etc. But if you have the money... Go for it.

,Rich
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Old Jun 24, 2003 | 03:17 PM
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the turbo'd motor will make more power than the nitrous setup and its puts less strain on your daily driven motor when not in boost. right now i have an ls/vtec turbo setup in a full interior civic si, it took a little time to get it right but it runs perfect right now and i have no problems other than my busted ass tranny. a 12 second track time will be very easy to do with 12psi in your car

if u plan on going nitrous with high compression i would also recommened SS valves and a bit more than a 50 shot because that will not yield nearly as much power as the turbo motor and wont get u into the 12's in a full bodied teg.

boost is better but more expensive

actually fuck it do it all, high compression, boost, and nitrous
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Old Jun 24, 2003 | 03:18 PM
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one other thing, ditch the ls rods and pick yourself up some eagles for 300bucks
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