sl horsepower?

[blk92sl]

A question for you more knowledged people... how high can i realisticly get a sl as far as hp and torque? after the intake/exhaust/suspension mods, would a supercharger or a turbo be better? i know the answers might be in here somewhere, so sorry...

[Zeiss]

I would say that an NA could get to 270s hp. It all depends on what you want. Of course the car will have more hp with a turbo/sc but with that comes other things you need, not to mention money and time. For me I will probably keep my car NA, its just not worth it for me to add a turbo or sc. But I will spend money upgrading exhaust, intake and visual upgrades. Its all up to you.

[Igovert500]

Yeah, I'm betting IPO and Hotshot have ALOT more than 270. It all depends how much time and money you want to put into it. There is an NA upgrade Bible in the FAQ, but eventually, you will probably want to look into Forced Induction, as many others do.

There are a half-billion threads about supercharging and turboing an NA in here alone. So I'd recommend doing some searching. There is also a bit in the FAQ on both options. And lastly, www.3si.org has an entire forum devoted to Forced Induction SLs and base models, so check that out as well.

[Hotshot8792]

Originally Posted by Igovert500

Yeah, I'm betting IPO and Hotshot have ALOT more than 270. It all depends how much time and money you want to put into it. There is an NA upgrade Bible in the FAQ, but eventually, you will probably want to look into Forced Induction, as many others do.

There are a half-billion threads about supercharging and turboing an NA in here alone. So I'd recommend doing some searching. There is also a bit in the FAQ on both options. And lastly, www.3si.org has an entire forum devoted to Forced Induction SLs and base models, so check that out as well.

i think what has been said in this thread is accurate. You should be able to get around 270 hp while staying N/A and not doing anything internally to the engine, but your looking at a lot of mods. I think 300 hp is obtainable with 11:1 pistons and head work. However, to get much more out of your car, you will either need to obtain nitrous, a supercharger, or a TT conversion.

[exterra3000gtsl]

They Also Have Camshafts Which I Would Rush To Get If I Had Enough Dough

[imp pwr online]

Originally Posted by Igovert500

Yeah, I'm betting IPO and Hotshot have ALOT more than 270. It all depends how much time and money you want to put into it. There is an NA upgrade Bible in the FAQ, but eventually, you will probably want to look into Forced Induction, as many others do.

There are a half-billion threads about supercharging and turboing an NA in here alone. So I'd recommend doing some searching. There is also a bit in the FAQ on both options. And lastly, www.3si.org has an entire forum devoted to Forced Induction SLs and base models, so check that out as well.

just a little, I ran 11.4 @ 131 MPH on an NA block and internals. 11.4 @ 132.97 on an NA block with TT internals.

just a tad more than 270

[emerica4601]

i have an sl and i can safely say i have about 245 horses in it now. I believe you can get it a bit higher than 270 at the crank. the mistake i made is i lost torque off the line by haveing a custom exhaust made .... it was 3" from the cat to the actualy muffler which was mounted 3 ft from the tail pipe. it turned out i didnt have enough back pressure. at high rpm's i gain horses but at low rpm's i lost torque.

get some cam gears, 2.75" catback, intake, 360cc fuel injectors (vr4 stock), exhaust manifolds, high flow cat, under drive pulleys, and other junk basics. remember, you shouldnt run forced induction on a n/a motor if it isnt tuned correctly!

and also, dont think that hp and torque is what makes ur car faster.
lighten up ur car by takin out the internals.
also ..... different 5spd trans with larger 1st and 2nd gear ratios means
quicker off the line starts

[xXxRocker5150]

^ yea I was gonna' say, you shoulda slimmed down to 2.75" cat back or ever 2.5"

[Zeiss]

Im getting 3 inch because im getting the long headers soon so that would be alright then...? Also if you ever would want to convert to TT or SC 3inch would be good for that.

[Stealthee]

Originally Posted by emerica4601

i have an sl and i can safely say i have about 245 horses in it now. I believe you can get it a bit higher than 270 at the crank. the mistake i made is i lost torque off the line by haveing a custom exhaust made .... it was 3" from the cat to the actualy muffler which was mounted 3 ft from the tail pipe. it turned out i didnt have enough back pressure. at high rpm's i gain horses but at low rpm's i lost torque.

get some cam gears, 2.75" catback, intake, 360cc fuel injectors (vr4 stock), exhaust manifolds, high flow cat, under drive pulleys, and other junk basics. remember, you shouldnt run forced induction on a n/a motor if it isnt tuned correctly!

and also, dont think that hp and torque is what makes ur car faster.
lighten up ur car by takin out the internals.
also ..... different 5spd trans with larger 1st and 2nd gear ratios means
quicker off the line starts

Couple things. The 3s DOHC was overrated at 222hp. You are basing you 245 number on starting at 222. The DOHC is realistically no higher than 210hp stock. Most decently modded DOHC's dyno in at 180hp which is right around 220hp. There is one highly, highly modified NA over on 3si that is making 190 whp, which would be right around 240 at the crank. Also not one single 3s NA is making enough power and moving enough air to need 360 injectors. The largest injectors that a NA will ever need is 240's, like from a DSM. Thats even a stretch considering NA's run extremely rich as is. Cam gears also arent that beneficial with these cars. Aftermarket cams however can help immensly but then you are getting into some serious cash. Also an intake frees up some restriction but you will be lucky to see 1-3 hp on a NA. Exhaust will free up some power but the stock catback is actually pretty good. The stock downpipe and cat is the most restrictive part to the exhaust. Long tube headers, or stock manifolds(which are pretty good) with an aftermarket dp and a test pipe/highflow cat will improve the overall power band.

Honestly if someone were to build a 270 crank hp NA it would not be very streetable. You would need at least 11:1 pistons, if not 12:1, then you are getting into higher octane fuel, timing control and possibly stand alones, race cams with upgraded valve springs, raised rev limit(stand alone of course would make that easier), underdrive pulley, aftermarket ground wire kit, dp/headers, test pipe/high flow cat, straight thru single shot exhaust, upgraded ignition, and the list goes on.

[exterra3000gtsl]

the only thing i dont get is How can a ground wire kit actually give you power?...

[Stealthee]

I forget the full explanation but basically it maintains voltage better. Your car will run better and more efficient on 13.5 volts than it will on 13 volts. Thats put in the simplest terms possible. Plus I am tired and its late.

[imp pwr online]

Originally Posted by exterra3000gtsl

the only thing i dont get is How can a ground wire kit actually give you power?...

If you have bad/dirty ground connections, a grounding kit will help with the grounding path giving the plugs more power.

[exterra3000gtsl]

well then...we'll see if it actually works

[emerica4601]

a grounding kit wont really do anything for you. however if u get an ignition kit then it will. if your running 12.5 volts then its the best u can be running at.

and i deffinetly think that 270 crank hp would be streetable and na u def wouldnt need diff comp ratios and pistons. just a buncha bolt ons and also the right touch should get the stock 222 to 270. thiink about it, intake, full exhaust (headers, test pipe, catback exhaust), msd ignition, fuel injectors, fuel pump, under drive pulleys, high flow mas, throttle body, intake manifold.

that would safely put u at 270 at crank