So far, I haven't seen any info on this topic, and a friend of mine asked me and it's got me real curious... What does the 4g63 put out for HP and torque with no boost? Has anyone dynoed their car with boost turned completely off? Has the engine alone been dynoed? Just curious to see if there are any real numbers out there!

 

thast kinda like an oxymoron....the 4g63 is designed to be boosted.

in order to dyno test the car with NO boost you would have to have the wastegate completely open....once that happened....it would have to be tuned for use without a turbo....

i dont' know who would or why they would try to do this....there really is no point

 

LOL...why no boost? You should ask if anyone built a NA all motor 4G63.

 

do that with the new mivec 4g63

 

he is just wondering how strong out engines are without the boost. like how much of the 273hp is from the turbo and how much is from the engine.

 

i think hes got a good point. take the 2g DSM for instance. they had a gs model and a gst model. the gs was only putting out around 165hp while the gst was doing 210hp. it would be interesting to see what the differences are.

 

I'm sure it would be about the same as the eclipse GS. Keep in mind that the EVO, in stock form, boosts about 18-19 psi, while the turbo eclipses probably only boosted half, if even that (not sure of the exact number)

 

The GS and GST had two completely different engines, the GS-T had the 4G63, while the GS had a 420a or something, its the same engine as in a Neon.

 

my GST that was using the stock turbo, i was boosting that little bastard to 16psi. it was screaming. the factory boost was 12psi. i upgraded the turbo to the HKS unit which is the t-28. i ported the exhaust side of the turbo and the 02 housing. was able to boost to 18psi with supporting mods-injectors, SAFC, Electronic boost controller, greddy type24 intercooler and pipes, 3'' dp, 3'' tanable racing medallion exhaust. it scooted really well. with all that done, it was equal to what my Evo felt like stock. i am now way past what i would have ever done with the GST.

 

Being that our engines boost somewhere on the order of 1.3 atm stock....i would guess that the 27x power is in the area of 2.3 times what the motor would be n/a. Same thing for GST....210 hp at 0.8 atm. Both come out in the neighborhood of 120 crank. Assuming the powerband will be a little different, if I were to guess, id say somewhere in the range of 130-140 hp crank. Yikes.

Now granted, the volumetric efficiency and stuff like that isnt as easy as adding boost pressure to atm pressure, but its a rough approx.

 

The 1G non-turbo DSMs had 4G63 mills. The 2G non-turbos had the Chrylser 420A. Some things were different on the non-turbo 4G63, but IIRC, the power output was something like 135HP stock, so Mercenary's math is close.

 

our compression ratio would make for a crummy N/A engine right?

 

I had the same question and had it answered awhile back......

Link

It put out about 95hp at the wheels because of the compression.

 

Well, it put out 95 whp at 3000 rpms...

 

exactly... I'm not saying somone SHOULD do it for any practical reason, just curious what our engines put out without the boost, to see what the difference is... Thanks for the input people

i'll assume we can agree that if we get 95hp at the wheels at 3000rpm, then at peek powerband we might see around 140 or so.