I have a gsr now, and I want a turbo, but I have noticed that the compression on the LS is turbo-friendly and a ITR intake manifold will bolt up to an ls engine among other turbo-friendly things.....and a LS can be found cheaply. My question is, should I sell my gsr, use the excess cash and build up a LS motor and apply some serious pressure to it, or should I keep the gsr and save for a turbo?

 

GSR

 

ls turbo is better. i ran better times thatn a sc gr-r the other nite. ls bottom end is stronger as well and the transmission is better for turbo do to longer gearing.

 

LS

 

gsr....just put on the ls block then turbocharge it and should be all well. just make sure to tune ur vtec overlap for best performance

 

he isnt asking about a SC GSR. Why do you say the LS has a stronger bottom end? Everything I have heard is that the GSR has a better bottom end stock. The compression may be lower on an LS but that doesnt make it better for a turbo.

 

I think the fact that the LS has taller gearing makes it the better choice...just in my opinion. The compression is lower allowing you to boost more (although that can always be altered with aftermarket pistons on a GSR), but dropping in a new tranny is a little bit more involved..

 

Ok, so maybe the GSR has a stronger bottom end...but on a stock GSR engine, I can only blow about 10psi right? It does have VTEC, but can that be a problem with a turbo? The main thing here is money...I can use the saved money to fix up the LS, but my question is...after building up the LS motor and slapping a turbo on it, will it run better times than a stock GSR with a turbo??

 

The LS motor is actually better, not for the fact that its got lower compression, but, it can handle a turbo easier. From what I read about, Vtec and turbo isn't exactly the best combo. They say that the high end takes a huge beating with both the turbo and vtec kicking in. In that case, you'd have to build up the head, which costs more money.

Either is a good choice. I was going to buy a GSR motor, but, I decided to stick with my LS. The LS motor can be made faster stock, opposed to a stock GSR turbo.

 

10 psi? Damn, for everday driving on a stock motor, your looking at 6 to maximum 8 psi to be safe. If you put it 10, your going to hurt things and eventually break something. LS is good for the fact that it has long gears. It also has a good amount of torque. Therefore the initial start will be better. I would turbo the LS. Just my opinion though

 

The GSR motor is better for turbo stock blocks.

 

I never knew a LS tranney has longer gears than the GSR tranny. I am installing a GSR tranny in my LS as we speak. I am having the whole motor rebuild and adding a GSR tranny. I wanted to get a ITR tranny with LSD but some one told me that it wouldn’t work, so I sold it.

But you should got with the Ls for turbo I’m will be installing turbo next summer. I will be re-installing my LS tranny when I go turbo.

 

When was the last time you saw a b18b making 290hp at 7.8lbs of boost? I know I never have, but that is what some people with b18c are making. Obviously not everybody with 8 psi in a gsr makes that much. VTEC isn't going to be a hinderance at 8-10 psi. IN fact it will help you make more power.

 

You knew it without knowing it. THe longer gears are the reason you planned on reinstalling the LS tranny when you went turbo

 

ACTUALLI I MENT TO SAY I GUESS I WILL BE REINSTALLING MY LS TRANNY WHEN I GO TURBO

 

yeah that's what you said in the first place

 

so can anybody give me any numbers on a built & blown LS ? I am looking for horsepower, 1/4 times, anything! also, will a type-r LSD fit in a LS tranny, they are all Bseries....so they will right?

 

OK, so I am not sure when everyone got stupid, but this has been covered around a thousand times and we come to the same conclusion:

1) The GSR has a crank girdle that secures the bottom end in place. This makes it easier to rev higher and makes the block stronger overall when under load.

2) The GSR has oil squirters for the pistons. This keeps the pistons cooler and prevents detonation.

3) The GSR has a better cylinder head design. It flows MUCH better than an LS head and is awesome for forced induction.

4) The GSR has a higher compression ratio. The higher the static compression ratio, the more power you make. With 94 octane fuel and RELIABLE fuel and ignition control, you can run 15psi on 10:1 compression (GSR). It definately can be done.

5) The GSR has VTEC. VTEC and forced induction work awesome together. Let all the misinformation stop. Everyone is concerned that with overlap in vtec you will "blow all the boost out the exhaust" but this is quite overblown. The motor flows MUCH better in vtec than an LS head ever can, and any overlap that might scare you can be tuned out with a set of cam gears. Either way, VTEC is definately a good thing because of the duration and lift the larger lobes provide.

6) The GSR redlines higher. This means that with a completely flat torque curve, the GSR will always make more HORSEPOWER than an LS with the same torque curve. The higher the redline of a motor (with a torque curve that complements it, too) the more effective a motor is at turning twisting force (torque) in to usable power (horsepower). The GSR can pull LONGER with a higher redline, because it can use the gearing of a gear LONGER and have more effective torque at the wheels.

7) The longer LS gearing is only useful if 1) you are having insane traction issues (Get bigger slicks!) or 2) you did not choose a turbo efficient for your boost level/motor. With turbo, you are going to HAVE to shift to 4th in the 1/4 anyways (maybe 5th if you are fast enough!) so you might as well use the GSR transmission and put more effective torque to the wheels because of the closer gearing.

There are many other small differences that make the GSR better than the LS. Want to know the ONLY reason to go with an LS motor for a turbo setup? It is cheap and disposable. When you break it, you can get new parts/a new motor for much cheaper. That is it.

Bottom line: the GSR motor will make more power AND torque compared to an equally equipped LS motor.

Dustin

 

this topic is annoying. i should of just bought a damn prelude. gsr this gsr that,vtec this vtec that.

 

good job dustin

 

You should reply to it then.

 

Yeah dustin is right, what makes all these rumors come alive? It is true about LS having lower compression, but a boosted gsr will eat an ls for lunch any day any time. Seen it too many times with my own eyes on the street and the strip.
Nuff Said,
EVIL

 

He may be right but i see fully built LS with turbo beat built Turbo GSR’s lots of times. It all depends on how you build your motor and how much money you put into it. My boy is getting his motor done they said when it is all done out it will be able to take any 4 banger no matter what it has. It all depends on how much money you have to spend and who does the motor. When his car is finish i will post pic and time slips just to prove it.

It all comes down to money


[Modified by smokeeeLSR, 9:53 PM 8/13/2001]

 

Any 4 cylinder?!?!?! Wow. So he's gonna be in the low 8s Somebody should tell Papidackis to watch out.

 

Stick with the GSR. While all the LS turbos lag of the launch, you still have the 10:1 compression to make up for it. More boost doesn't necessarily mean more power. The LS is nice b/c of the longer gears in the tranny but the GSR will make more power with lower boost. Everyone knows that tuning is the key to the turbo setup so tune a GSR powerplant right and you will see big numbers on the dyno.

I personally have a GSR with a turbo kit and this combination has worked fine for me. Oh yeah I'm doing 6-10 pounds on the stock internals and stock clutch. hehhee

-AzianAvenger