Thread: Nissan Primera sr20ve-t Dyno

We were right at about 7800 rpm and that was more than enough. It made for a very damn fast car. I am not sure why people are so caught up on revving so high.

In paper the 20v are the "best" cams for mid and large turbos , after Im done with my testing I will put them.

It's all about the widest powerband. If I can get power from 4000-8000rpm then it will make for a very stout powerband, with peak power around 7000rpm. The extra revs help with reducing the power lost after the shift.

A car with 500whp avail from 5000-7500rpm will be much faster than one with 350whp avail at 5K, and 600whp available at 7500rpm that has a really peaky powerband. I'm not out there for the most HP, but rather the most disireable powerband for a versitile engine. I want a solid 11 second car in the 1/4 mile, but I still want to track the car at Miller Motorsports Park locally. Maybe I should swap a ka24de in there

Regarding to the spool here is a comparo...
left 3gear (5200 rpm cam switch)447whp tuned-right 4gear(5000 rpm cam switch) same boost but untuned... 382whp...(this was 1 of the first dynos....) you can see clearly the spool diferences... about 500-550rpm from 3 gear to 4 ... Next time on the dyno Im going to do a pull in 4 gear (tuned) I know its will make a little more power and a broad powerband...



Now I know I can make this turbo to spool in the 4500 rpm area(4gear) with the same turbine housing this is very interesting guys since its a 62mm inducer (comp) and a 67 exducer on the exhaust side) this is a pretty big turbo and the spool is fantastic and also its looks like it will have pocitive delta-p even at 22-23lbs wich means near if not 600whp area So now it may be pocible to play with a smaller turbine housing and see what its does (allways manteining the positive back pressure) I think a 0.80 turbine housing will bring the spool up to 4200 rpm(gt3071 territory in a DE) aprox easy(4gear) for a 72lbs (and 900 hp turbine side wheels)comp its pretty outstanding..
What would be your opinion regarding this... ?
Thanks.

You may quicken response with a smaller housing, but I don't know if you will actually spool the turbo much faster. Not on these particular engines anyway. But I am always anxious to see your results from testing.

On my .63 housing with a log manifold I brake 200whp at 4100rpm. Not bad, considering the massive exhaust leaks. With the new manifold, housing, and leak-free gaskets I hope to make 200whp by as early as 3500rpm.

I think logging backpressure will def give you a good idea on what is going on inside the engine. If by putting a smaller housing on the turbo you decrease the VE of the engine, then spool could get worse. Especially with those huge overlap cams.

but on your log, the manifold is the restriction not the housing. a smaller housing with a merge short runner collector manifold may spool it up earlier and make more power. Also are your dyno's 3rd grear?

that is quite fast spool for such a big turbi. The 4th gear dyno, far out that goes from no boost to boost so quick! i wonder if it has anything to do with switching points? i take it these dyno's are 20ve cam results? did the spool feel any different going from 20ve cams to 16ve?

would love to see your results going a slightly smaller housing, it was a 1.06 currently right? Would also be cool to see your current housing with a set of n1 cams......considering how low your back pressure is.

big props to ya, i am loving the info you have been posting

That its why I allways mesure backpressure to know what its going on... like I said .. if I can keep the delta-p positive with a small turbine housing Pocibly getting fullboost its going to be much faster like 300-400 rpm.

Im going to buy the Garrett turbo speed gauge and a combustion chamber device to measure the pressure...

I dont think I ever dyno'd this, but I messed around on the street with my T67/T4 .68 divided housing for spool. With the SR16 cams from 2000rpms I could get 15psi by about 48-4900rpm in 3rd, 4500 in 4th and in 5th from 2500 rpm I could get 15psi right at the point where the cams would kick, the cams would change at 3800rpm, then it would go from 8psi on the small lobes to 15psi almost instantly.

Thaks man I really apreciate this.