i have a 90 LS, any tips or advice on what to use to turbo it or should i just go LS/VTEC?
Checkout the turbo guide at the top of this forum
My setup 92gs
Full Race Stage 2 Turbo Kit
Full Race Dumptube
PWR half radiator
Hondata ecu
RC 550 injectors(maybe going bigger)
Walbro 255 fuel pump
this is what im tuning for 10psi untill I get my SLEEVED BLOCK!
you dont need to go VTEC head to make power. Just choose the right turbo setup and have the proper parts and it’ll be just as fun and fast on the street.
[QUOTE=ExospeedRacing]you dont need to go VTEC head to make power.
Wordz Upz , non v-tec turbo’s Kick ass :rockon:
very true. Stock LS motors have made over 300whp and live if all vital signs are good to begin with. I did the LS turbo and the LS/VTEC turbo. The nice part i liked about the vtec change over was my driveability and gas economy. But you can go very far with a LS. Either motor with a turbo behind it is going to be fast regardless.
Mike: I was wondering how many miles per gallon you got with the ls/vtec and ls turbo?
If your staying stock motor dont do ls/vtec…you might make 10-20 more whp but you will lose torque due to the better flowing head. My ls made 304whp at 14.5 psi (270wtq). my other friends ls made 315whp at 15 psi (280wtq). I love boosting ls’s because of the torque numbers. do a comp. and leak down test to make sure your motor is healthy and boost away. dont cut corners on tuning and everything will be fine.
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.
a stock block is good for about 330-340whp before you gotta worry. a ls head will get you to 320whp with no trouble if you slap a vtec head on you will get soime extra hp (youll probally hit 330whp or so) but you will loose alot of torque. id rather have 10-20whp less with 40 or so more pounds of torque.
Just curious why everyone is saying you will lose a lot of torque?? Isn’t the whole point of ls/vtec is too have the ability to rev a little higher and make power, while still keeping the higher torque numbers from the ls?
Thats what I figured as well. Thats why they call it ls/vtec. You have the low end torque and the top end hp.
My setup 92gs
Full Race Stage 2 Turbo Kit
Full Race Dumptube
PWR half radiator
Hondata ecu
RC 550 injectors(maybe going bigger)
Walbro 255 fuel pump
this is what im tuning for 10psi untill I get my SLEEVED BLOCK!
18 Jan 2005 15:36
Is this set up on stock internals blackcoupe01
yes thats the idea…you make more torque than a gsr or b16 but not as much as a ls…the head flows better and the increase flow drops torque numbers. you can make 300-320 with no problem on a ls…why go lsvtec on a stock block?
What are you talking about “not as much as an LS”? It is an LS!! I don’t see how you are making any sense? You do an LS/Vtec setup too KEEP your LS torque numbers! And have a better flowing head with the ability to rev higher. And to my knowledge you wouldn’t have more torque from a stock LS/Vtec setup than a stock gsr either (someone correct me if I’m wrong)…Why would you put a vtec head on an ls if you were just going to lose torque? That completely defeats the purpose of LS/Vtec…you might as well stay with the stock b16 or gsr if that’s the case?!? Someone else please correct me if I’m wrong…
ok the reason a ls makes more torque than a gsr is the stroke (gsr = 87mm ls = 89mm) another reason the ls makes more torque is the poorly designed head…the shittier a head flows the more torque it makes. Yes the reason to build a ls/vtec is to keep torque…but your not keeping all your torque…for example.
http://www.boosted-hybrid.com/viewtopic.php?t=85
that right there is a ls/vtec tune. on 9psi it made 253whp and 174 wtq…to me that is stupid. on 12psi i made 282whp and 240wtq. now if you would of run an extra 2psi on that motor (rule of thumb is 15whp per psi of boost) it would of made more power than me but there not way in here he would of gotten an extra 65wtq out of it. Let me search for more examples for ya…
http://www.boosted-hybrid.com/viewtopic.php?t=1328
ls/vtec…9 psi…290whp or so…only 200wtq or so…now when i was making 282whp i had 40 more wtq than this ls/vtec. now for one more dyno sheet:
ls with pistons n rods stock comp. 417whp and 339wtq! find me a ls or gsr that makes 417whp and any thing close to that torque!
TY 
It sounds like you completely forgot how big/small the turbo is, plays a HUGE factor in the power outputs as well as how the motor was tuned. As far as “the shittier the head flows the more torque…” then why does an ITR make more torque than the LS? I know it’s NOT b/c that head flows shittier than the LS. Search these boards, there are numerous people here only making around 200-220lbs of torque at 8-9psi.
Gotta love torque, it’s why I love the straight ls, even though you can’t make more hp…
id like to see a boosted itr make more torque than a ls please show me.
To the thread starter: Sorry for jackin your thread like that! My apologies…
As far as your question…
Quote:
Originally Posted by ShafftsGSR
"have to disagree with you on the power aspect. You’re right the “usable power” is the area under the curve, but when it comes to power you want more tq…
think about it this way…
Boosted LS : high tq @ low rpm range = spools faster, get the power quicker
Boosted GSR: high hp @ high rpm = slower spool, lower tq further into the rpm’s, higher hp.
High HP numbers don’t really mean alot when you have to get it to 8k before reaching it…
EG IMO: 300whp/280wtq @ 6000rpm LS > 350whp/ 220wtq @ 8000rmp GSR and I beleive the LS would SPANK the GSR
Don’t get me wrong i’m a VTEC owner (I LOVE 8500rpm) and have been for a while but i also built an LS/VTEC too and the tq that it gave and the Area under the curve made is soo much fun
When it comes to “POWER” tq is key. "
Posted by Xenocron
"Sorry, you’re pretty much wrong…
HP = TQ x RPM
The farther you can carry your TQ up in the rev ranges, the more overall power (area under the curve you will have).
LS motor peak out at ~5500 rpm…and then torque falls flat on it face while the VTEC has another 3000rpm left to go while torque stays flat or continues to increase in some cases.
And if you are talking drag racing with the peak #'s you posted LS vs. GSR…the GSR will beat the LS (granted the vehicle weighs the same) and use MUCH less boost to acheive those actual numbers (because of the efficiency of the head)."
Hope that gives you a little more info on what to do…I personally would boost a vtec motor if I had the chance, just for the reasons that xenocron gave…
There are so many factors to that!!!
Turbo size, boost levels, engine management, the list goes on and on!! I’m sure I can show you a boosted ITR making more torque than an LS, BUT I could always come back and show you an LS with a better setup and tune making more, or vice versa. I’m talking stock to stock. Why doesn’t the LS make more torque than the ITR if the ITR’s head flows better?