Thread: Big Numbers On SR22VE 20V

A higher compression motor will make the same average WHP as a lower compression motor pound for pound with the same turbo.

A higher compression motor will make more WHP than a lowe compression motor yes but the average WHP per pound will be the same.

Dont bring cams in to this talk because one has nothing to do witht the next cams will make more WHP just to the main fact that if a cam is bigger it will alow more air into the engine per revalution which will make more HP. Then the WHP will go up even greatet because of of more compressed air going in per revalution.

This is not the same with compression. The average WHP will always be great because you started with higher compression but the average WHP per boost will stay the same between a lower compression motor and a higher compression motor.

Cams and compression do 2 diffrent things.

At the end of the day you need to look into your car as to why it is making 450 WHP at 24 PSI.

I am not having any troubles with the WHP department.

Every wonder it is like to punch it in 5th and have no traction? ^^ this guy knows!

Definitely nice numbers, I bet that thing is scarey on the street.

Here is a comparison for you dre.

http://www.squirrelpf.com/turbocalc/graph.php?version=4&pr0=1&pr1=1.07&pr2=1.73&pr3=2.4&pr4=2.4&pr5=2.4&pr6=2.4&pr7=2.4&airflow0=2.3&airflow1=7.3&airflow2=16.4&airflow3=28.7&airflow4=34.7&airflow5=38.7&airflow6=41.7&airflow7=42.8&product_id=42

http://www.squirrelpf.com/turbocalc/graph.php?version=4&pr0=1&pr1=1.07&pr2=1.62&pr3=2.17&pr4=2.17&pr5=2.17&pr6=2.17&pr7=2.17&airflow0=2.5&airflow1=8.2&airflow2=17.1&airflow3=28.8&airflow4=34.9&airflow5=38.7&airflow6=42&airflow7=43.1&product_id=42

The only difference in these engines is a 10% difference in VE, and you can already see that the difference in PR will change the amount of power to drive the turbine.

At 10-20psi, and 110% VE (which is possible with a large turbo) The WHP increases from 335 to 485. 150whp difference with 10psi boost.

At a 80% VE, the same engine theoretically increases from 244 to 352 using the same pressure. A difference of 108whp. And thus, only a 10.8 hp/psi. Compare that to the engine above making 15hp/psi.

You can try your own equations and play with it a bit. This is just some simple plug-ins in my turbo calculator, and doesn't have anything else taken into account (ie pressure ratio changes) but the difference is clear. By how much the CR changes remains to be seen, but it does affect the power output AND the power/psi. I've seen this numerous times with several different cars on the dyno.

It can all be said that I only make 450whp on our dyno up here, but none of you Florida boys do this to your P11 trannys,


yet I've manage to destroy 7 with rolling boost pulls in 2nd, 3rd, and 4th gears.

Higher compression engines increase VE by imposing greater force and easier suction on the opposing cylinder's intake stroke, allowing the engine to breathe easier. My engine made 478whp and 440wtq on 26psig on our dynojet with 8.5:1 compression. 26psig here is like 23psi sea level, and I don't have any head work other than s/r. Like I've said before though, I think the car will really wake up with a larger turbo. a 60mm turbine can only flow so much with a .53 ar-size turbine housing.

Holy shit!!! Breaking News!!
If you break a P11 tranny that means your are making amazing POWER!!

I have so much I want to say but, I don't want to be mean.

can u plese explain this a little more?

Wow those are some nice numbers great job.. Looks like u guys know what your doing. Didn't even break anything on the dyno? Lol Nice job!

I don't see how any of this is directed to you anyway.

Dre, did you ever get a dyno chart you can post up?

I don't see how you breaking your transmission and 10% VE change has anything to do with difference in CR would make on this setup.

There are two different topics at hand here.

Dre simply stated that a change in CR wouldn't effect the whp/psi made. I simply took it to an extreme case to prove a point. Changing the CR of the engine does effect the VE of the engine, but to what extent depends on the engine, and there is much to consider.

Dre made it a point for me to look at why my engine "only" makes 450whp on 24psig. Even if I could make more power, the tranny wouldn't hold it for longer than a couple pulls. My 740cc injectors are at 104% duty and MAF is reading 4.98V. Clearly you can see my setup is maxxed out, even though the dyno shows "only" 478whp. Dynos all read differently though. I just don't understand how you guys keep the transmission together. I baby my transmission compared to most guys and I always make clean smooth shifts. But every time I break a transmission it is in the middle of the pull (not on a gear-shift). With the MAF and injector readings I am getting it seems the car is making more power than the dyno says. 740cc injectors shouldn't max out at 478whp, and the maf shouldn't be maxed either.

I know one guy right now that snap axels or brake a 15 tranny. How many guys do you know that brake a b15 or snap an axel like its a piece of tree branch with a t28 turbo a $500 s15 turbo doing 11.6 in a 1/4 mile. There is a sentra now in south fl making 600hp 25 psi afr @ 10.4 jim wolf ecu with stock bore block 35r turbo with no traction in 5th gear so before you wanna talk bout fl just take it easy cause we come hard and there are alot of 400 hp plus sentras that are not on this forum