Alright so I built up an all motor LS/VTEC (OS P30's, ITR head). According to c-speedracing, my compression is around 11.5:1.

Well now after a few months, I'm starting to get bored of it and have been thinking about adding a Jackson Racing Supercharger with the low boost (6-7psi) pulley.

The car will be tuned again of course if the supercharger is added.

Do you think this setup will be safe?

 

Unless you can get the aftercooler for that setup, i would scrap the idea. That's not to say you can't SC or turbo it, you just need a way of keeping your IATs lower. When running higher compression like that AND boost, its very important to have low IATs (intake air temps) otherwise detonation will occur. What fuel are you planning to run?

 

93 octane Exxon no Ethanol (at least here in Nashville).

Does JR make an after cooler kit or is LHT the only ones who make them? I have no problem running an after cooler kit if that's what I need to make it work properly.

 

any other thoughts?

 

LHT is the only one i know of
but with that CR your going to need a cooler or your going to have some detonation

 

dude why do u want to go supercharger ur all motor lsvtec is sweet

 

a roots SC with high CR = motor death really fast

 

I may just be talking out of my *** here, but maybe someone can make you a custom sized aftercooler? Its just a air/water intercooler that sandwiches between the blower and its manifold as far as I know (Once again, talking out of my *** here)

 

a lot of people run the jrsc with a jdm b18cR and dont have problems, i imagine with the lht and low boost and a great tune it would perform quite well

 

Any high compression setup + boost is going to be very prone to detonation. Not that it isn't possible, it's just very dangerous. If you can retune everyother week, keep an eye on AFR's, EGT's, plug pepper etc then go for it, it's just going to be a big hassle to do it right and safely. And you might as well go with a turbocharger instead. With that high of a CR, lag is going to be at a minimum and it should be a monster on the top end. Just my two cents.

 

That's why people with RSX's run JRSC's all day long at 11psi without issues, right?

You most certainly can run the JRSC with that compression, but just be careful. The margin of error for tuning just gets much smaller.

If you're concerned with IAT's, then consider methanol injection or aftercooling. The methanol is a much more cost-effective solution.

- Derek

 

You will be fine at low boost.

 

I used to have an LS/VTEC with 12.5:1 compression, it used to be all motor, then put a JRSC on it....worked fine for me....now I put forged pistons in it but I'm at 11.5:1.

I made 260 at 11psi with mine.

 

That's how I see it. the JDM B18c5 and K20's are both higher compression motors and people are supercharging them.

It's just a thought. I do love my N/A LS/VTEC, but I'm starting to get bored of it and want a little more TQ.

If I do it, it will be done right so I'm not worried about that part of it.

I'll have to do some more research about Meth Injection.

What about the Vortech Supercharger Kit with their cooler setup?

 

oh and I hate this new site. freaking sucks, so if you don't see my responding to this post much, it's because I don't come here a lot anymore.

 

well a b18c5 is like10.6:1 not like its jdm brother 11:1 so not as dangerous .........but for your set up yes colder air no matter how you do it and exstinsive tuning and it can be done but it will be a headache let us know how it go's

 

meth injection is a band-aid on a cut that requires getting stitches

 

...Or a cheap, effective means to:

A.) Increase effective octane rating of pump gasoline
B.) Take heat away from the super-hot intake charge coming from the blower into the engine

Now, how is this a band-aid? Oh, I guess because you have to refill a tank once every month with $2 windshield washer fluid, right?

- Derek

 

definitely can be done

 

It's a band-aid because you won't make any more power than you will with a good tune that accounts for the hotter air. It just keeps you from detonating on setups that don't have a good tune. It works wonders for some setups (like a SBC with a Vortech blower on it), but I got no extra power running it on JRSC setups. I ended up scrapping it and dealing with the high IAT's via adding fuel and pulling timing. Same power, less hassle and crap under my hood.

 

I'm curious as to how you didn't gain any power.

As far as meth vs. "a good tune that accounts for hot air," that doesn't make any sense. Conventional automotive wisdom says colder intake charge = denser charge. Denser charge = more oxygen. More oxygen = increased fuel demand. Increased fuel demand proves an increase in torque production. Torque production = power.

All you're doing by adding fuel and pulling timing is cooling the combustion sequence, not adding the necessity for more fuel.

What you're saying does not equate to a solid argument.

- Derek

 

OP: do you have a source of E85 anywhere close to you? If so just upgrade your injectors, lines, pump, and filter and retune on E85

 

you have no clue what you're talking about, do you?

 

Think about what you just typed, then apply it to a JRSC. A denser charge after the blower doesn't get any greater mass of air into the motor. A SC is belt driven and moves a fixed mass of air at the pre-blower air density for a given RPM. The rest of your post is just condescending.

 

NOPE nothing at all. care to educate me some?