Suggestions for the LS turbo CRX
 

Well I am hoping to hit close to 300whp with a stock LS in my rex i am just gatehring parts right now and would like some suggstions for a couple things

I have 390cc injectors those need to go but I don't think even 450cc would be ok...i didn't really feel like spendng mad cash on injectors but looks like i might need to, i am building an LS or Ls/vtec to eventually go in with a bigger turbo and more boost so should i just get the 450 and let it go till i want to up the power or just get bigger ones now to be safe and how big, is there to big?....

I was going to get a stage 3 clutch(clutch specialties) but that also seems to be at its limits around 300hp

I have T3 .63/.60 capable of 300hp but thats about it will this thing choke my 300whp goal?

Well this is just a project car and this set up is just to get the B swap over with and turbo on it while I am building a better motor to make more power with...I don't want to waste a lot of money now and then have to upgrade later, thanks for any help...Matt

Re: Suggestions for the LS turbo CRX
 

are you staying obd-0? using turboedit for managment? and i think 300 whp is doable on dsm 450 injectors, prolly wouldnt hurt to have 550's though.....and for your turbo, a 63/60 t3 should get you to 300 whp but its a stretch, you should go with a 57 trim t3/t4 :y

Re: Suggestions for the LS turbo CRX
 

Staying with OBD0 and turbo edit for now but eventually will go to OBD1...If 450 will do it id rather get some for $50 than have go bigger seems like after that i would need to look into some RC and pay alot more for them, say with the T3 I have it so if it will do it i'll keep it, I'm still collecting parts for the swap the suspension and turbo kit so i am trying to keep cost low and use what i have if i can, thanks for the input...keep the comments coming

Re: Suggestions for the LS turbo CRX
 

why would u go obd1 if u r going to use turboedit?

Re: Suggestions for the LS turbo CRX
 

No I am already using Turboedit, when i get my other motor build I will proabably upgrade to OBD1 and then use uberdata or neptune...turboedit is only for OBD0

Re: Suggestions for the LS turbo CRX
 

Here's a little info you can read up on injectors and some calculators: http://www.megasquirt.info/v22manual/minj.htm#size


The only downside to bigger injectors is that the bigger they get the tougher it is to get a smooth idle

Re: Suggestions for the LS turbo CRX
 

but still i dont understand why youd convert to obd1 if you can use what u have now just fine?

Re: Suggestions for the LS turbo CRX
 

450's should be fine.

Re: Suggestions for the LS turbo CRX
 

Thanks Whitey that helps a lot

as for going OBD1 just seems to be more options I have a b18b I am building and and probably going to make LS/Vtec seem easier to just get a vtec ecu and convert to OBD1 rather than use a rpm switch or v-fac and uber seems to have more options than turbo edit...OBD1 seems to be where all the good tunes are yea there is support for the OBD0 but I think OBD1 is better...I guess it is all an opinion but I am using turbo edit and will before this next motor but whent he built one is finished I am probably doing the conversion...do you have any info why to stay OBD0 and not convert? or just because it is already there and working, kinda like don't fix it if it aint broke?

Re: Suggestions for the LS turbo CRX
 

exactly. and why spend money if you dont have to?

Re: Suggestions for the LS turbo CRX
 

yea point taken...anyone have any suggestions on clutchs?

Re: Suggestions for the LS turbo CRX
 

my buddy's running an act xtss clutch a 310whp and it holds up well so far

Re: Suggestions for the LS turbo CRX
 

LSD motorsports will hook you up. I have their stage 3 clutch (285 ft-lb) and 8lb aluminum flywheel on my B16. Love it. It holds great. :6

Re: Suggestions for the LS turbo CRX
 

I am running Turbo Edit now but I have been seriously considering switching over to OBD1 to run CromePro.It has lots of feutures and looks like the support is getting bigger and bigger everyday.I have thought about long term is the support for TurboEdit going to be there?The 88-91 Civic/CRX's are getting older by the day and i see less an less out there all the time. :-\

Re: Suggestions for the LS turbo CRX
 

Skip OBD-1, I'll never do that ---- in my CRX.

http://forum.pgmfi.org/viewforum.php...994c749b5c6c5f

Check out BRE. It's for OBD-0 DOHC VTEC ECU's (PR3, PW0) which have VTEC all built into them and ----. Also supports ostrich and all that good ----. I personally like the user interface more than any other tuning program I've messed around with.

As far as 300whp goes with an LS...good luck. Especially with that turbo. I've seen B16's with that turbo and other mods not make 300whp. Infact I think there's some vids in the gallery here. I'm not saying it's impossible but I've never seen it done.

As far as junkyard turbos go...it's probably going to be hard to beat.

Anyway I wouldn't shoot for a number, but I'd shoot for a power level that makes you happy and you're comfortable with. It does seem like 300whp is the bleeding edge for upgrading parts though. Once you're over 300whp and you have parts that support 400whp or more...well there's really no turning back >:D

Re: Suggestions for the LS turbo CRX
 

theres many options to activate vtec on a obd0 ecu, a socketed ps9 ecu is the easyest way "1 wire vtec" from the auto lockup solinoid, or even a pm6 ecu with vtec activation from the ac button, post in the engine managment forum they'd tell you everything u need to know, i just look at it like this dizzy=80,obd0-obd1 harness around 100,obd1 ecu socketed to run what you have=100 or more. or just socket your pm6 for less then 75, or pick up a ps9 and get it socketed.

Re: Suggestions for the LS turbo CRX
 

I never really did look into staying OBD0 much always though to run vtec you need a mad tyte jdm ecu which were kinda pricey...and well i don't have ac so might as well keep the turbo edit and stay OBD0...thanks

Re: Suggestions for the LS turbo CRX
 

OBD1 conversions can be a grip of money, and are probably pointless if you aren't exceeding OBD0 distributor signal capability of 9600 rpms.

TurboEdit does not - so far - have the configurability required to lend the high rpm resolution needed for DOHC VTEC boosted vehicles. AFRs end up pogosticking all over the place with TE on those engines. Works great for D16/VTEC and the non-VTEC engines, though.

BRE runs pretty damn stable, and is plug and play with your current wiring and distributor. It's set up for the 89-91 B16, so the high rpm scalars you need are already there.

You can hit 300 whp off a .60/.63, but with how tiny that turbine is you'll build up heat pretty quick and probably drop a ring land. 250 whp should be a safe bet, and in a light little CRX is a hoot.

FYI, 450cc at stock Honduh pressures (don't buy faggot FPRs, kthx) are good for 300 whp. Buy RC if you want to go bigger?? At those prices???? Get the $300/set Precision units, you can still get a really good idle all the way up to the 880cc units. Not as good ashigh impedance RC 750cc that don't need a resistor box, but you save a good $$$

Re: Suggestions for the LS turbo CRX
 

^^^ Thanks tons of good info...maybe I'l justs shoot for the 250 whp mark and be happy if I can make more :y

Re: Suggestions for the LS turbo CRX
 

I'll post how to pics of my $50 gutted lexan hatch, weights 18 lbs. At 250 whp in an already light car, losing 200 pounds feels like OMG.

Re: Suggestions for the LS turbo CRX
 

Is the hatch that heavy?...I have my interior out right now getting ready to paint and I think there is a noticable difference...I've heard of removing the sound deadening material to save some weight...I might do that since I have access to it right now

Re: Suggestions for the LS turbo CRX
 

Haha. OMG, pop those hatch shocks off for a minute and heft the goddamn thing. 75-80 lbs? It's mostly in the glass, but taking a holesaw to the frame rails to lose weight sheds a pound or two as well. That rear smoked over glass piece is *thick*, and the rear windshield itself is pretty thick too, just look at how it distorts things in the rearview.

Don't ---- around with the quarter windows, there is no use. The glass is about 5 ounces heavier than 0.060" lexan, pointless.


I spent $10 in dry ice to remove a 1/4 lb of sound deadening material that fit into both my cupped hands. HF's just don't have a lot, and it's not worth the hassle. If you've a DX, or an Si, it might be worth it, I have no experience. Some german/domestic cars have heavy little sandbag type sound deadening, which weighs a lot, but the thin rubberized stuff on the Honduhs is pretty light.

If you want to totally boyracer out your car, down to removing the dashboard to yank out your heater core, and removing the plastic backing to the dash (PITA, but it's half gthe weight of the dash) I can be of some assistance.

Re: Suggestions for the LS turbo CRX
 

I think i'll leave my si kinda nice maybe I can pic up an hf if i am going to make a race car, thanks for the suggestions

Re: Suggestions for the LS turbo CRX
 

Good man ;).

If you haven't noticed, most nice older Honduhs are being destroyed by riceboys, so if you can keep her clean and sit on her for ten years... you might be surprised what they are worth. When I was a kid, those 60's Mustangs were throwaway old used up cars - if you have one with matching numbers and in decent shape $$$$$. Through the late 80's and early 90's you could buy a TR6 in awesome shape for $6K, now they go for $15K+ with no rust and a few cosmetic issues, and in ten years they'll be $30K+ cars.

Re: Suggestions for the LS turbo CRX
 

250 is a good mark to aim for ... how much boost you plan on running and what octane gas.... sorry i kinda just skimmed through post not sure if you discussed that already

Re: Suggestions for the LS turbo CRX
 

well hoping to stay with street gas and i will turn up the boost as much as i have to to get to my goal...Thinking about a cometic head gasket which will allow for some more boost but probably shoot for around 14psi daily and turn it up for the track...I am aiming for 250 but i really want to get close to 300, this motor is just going in till my build motor is finish which who know when that will be...so if it blows "it ain't no thing" i acctually have another motor sitting here with a spun bearing that could be fixed and thrown in worste case

This isn't a race car just a hobby/weekend track car just trying to see what i can do...eventually going to get a welder and try and fab up my own mani designs and see what works best...I'mkinda creative but its all for fun, thanks for the comments

Re: Suggestions for the LS turbo CRX
 

i run a pm6 with turboedit for my b16 and activate vtec with an rpm switch, i've never had any issues with turboedit or running a boosted b16 with a pm6 and turboedit, my ---- is tuned to 11.5-11.7 afr's in boost and they stay there always, and i have beautiful idle at 15:1 afr and 14:1-15:1 afr's when in vaccum, this is with dsm 450's....

Re: Suggestions for the LS turbo CRX
 

Cometic headgasket is same thing as OEM, a good MLS unit, don't fool around with what is already fine.

Well, I thought I was going to do just that with B16CRXT's car, and Blundar about smacked me across a 6 hour driving distance phone connection. If you want to tell someone they are stupid and don't know what they are talking about, the contact info is admin@pgmfi.org. Tell him I said hi.

FYI, TE may log the correct AFR under lambda trace, but you slow down the engine like you are taking a long high gear pull, and the AFR drifts between the widely spaced higher rpm scalars. It'd show up pretty well on one of those dyno plots with the AFR traced out at the bottom.

Re: Suggestions for the LS turbo CRX
 

So you suggest just using a oem honda headgasket...i though the cometics lowered compression?

Re: Suggestions for the LS turbo CRX
 

LS compression is already low enough.

Re: Suggestions for the LS turbo CRX
 

cool, thanks looks like I'll just got get a honda head gasket

Re: Suggestions for the LS turbo CRX
 

hey what transmission will you be using with your ls? i have a crx as well that is ls turbo, just curious cause im using my cable gsr tranny?

Re: Suggestions for the LS turbo CRX
 

I am using a LS cable tranny...Don't know if its true but heard it is better to use when boosting because of the longer gears maybe also a lot cheaper and easier to find

Re: Suggestions for the LS turbo CRX
 

the long gear thing is a myth. All long gears are good for is gas mileage, not going fast.

Re: Suggestions for the LS turbo CRX
 

Which is why turbo mustang guys going from 3.55 and 3.73 gears to 3.08s pick up a LOT of ET and trap speed, with everything else the same, huh?

The way it works with the drag cars on 24.5" slicks, is you are faster with a VTEC gearbox until the 500 whp range. Now, on the street where you have a lot less traction, and if you have a really light car, which gearbox you have doesn't matter so much. 250whp in a heavy 99-00 Si stupidcoupe, or in an Integra with sunroof + options, you'd notice a big difference between gearboxes. For a lighter CRX... *shrug* I'd run the LS.

Re: Suggestions for the LS turbo CRX
 

Yeah, but having to rev the living ---- outa 2nd so it doestt fall on its face when you bang 3rd kinda sucks. Assuming a lag monster turbo is in play.
Although, having a 3rd that does 105ish is neato-burrito.

Re: Suggestions for the LS turbo CRX
 

Sounds like you lift off the gas pedal when you shift. No wonder you have problems.

Re: Suggestions for the LS turbo CRX
 

This is a vague statement. When you get down into shorter gears, the itme you run depends more on how good the driver can shift the car. Also your comparing a Mustang powerband which plateau's in the higher rpm's to a 4-banger that has a hp curve of 45 degrees.

Everyone has their opinions, I stand by the "don't fear the gear" statement and say run whatever trans puts you closer to redline at 1321ft. Long gears are for gas mileage and Supra's...

Re: Suggestions for the LS turbo CRX
 

I don't think tranny selection matters too much on higher HP cars that can pull the gears no problem...but it really does depend on the driver and their preferance. I prefer to have a shorter tranny myself so I don't have to worry about it falling out of VTEC or boost (when I get it) between shifts. Power shifting may not always be able to keep your RPMs up high enough totally depending on the tranny.

I've never driven a CRX with a B16 and LS transmission, so I can't really say if it would fall out of VTEC / Boost or not but I'd rather just play it safe.

Really though...just use whatever you have unless you absolutely cannot stand it.

Re: Suggestions for the LS turbo CRX
 

Who knows I have an si know and i wonder if i will notice the difference between that trany and then Ls once its in :-\ just got mounts and linkage in mail, the swap is getting closer >:D