How do you emprove if.....

This springs from Phinxes topic about his rebuild and his previos power figures.

A simple question, for example.....if I take a motor that makes 100kw on the wheels, lets say a CA18DET witch boosts 0.65-0.7 standard, timing is 15 digrees, compression standard=100kw

Now I add some stuff, tubilar manifold, bigger exaust housing on turbo, exaust, chip....it would make more power on standard boost=140kw, now I lower my boost to 0.5, compression a bit lower, timing retarded by about 2 digrees....

How does that engine make more power?

Hennie maybe you can shed some light on this because I don't understand....

hmmm, there's another mod there you didn't mention that has a big effect on the power.

:?:

The cam.....but does it really make a big diff on a turbo motor, aspesially is all things has been "retarded"?

one of the major contributors, the turbo on his engine came of mine, it has got the large turbine housing, but it also has a GT28RS compwheel in there. The turbo comp housing and centre has been machined to get it to fit. So the airflow is majorly better than a stock turbo.

So that means he actually has a T28 turbo...?

the comp wheel is a bigger than the stock T28, stock is around 42mm ind and 54mm exd and the RS is 47mm ind and 60mm exd. Stock one flows 270hp max and the RS 360hp. If you check the comp maps you'll see the stock one at max efficiency at 0.5 bar boost flows around 150hp and the RS just under 200hp at that boost. So flow is majorly improved.

dubble post

OK...now I understand better, even with all the drawbacks the turbo still delivers more than a stock one would with more boost.

Mistery solved..... 🙄

yip, like I always tell Phinx, it's all about the flow. LOL

Another question Hennie....

If I take the core of a T25, put on a AR 80 compression housing and a t28 wheel with a ar64 exhaust housing with a standard exaust wheel....how will it compare to your turbo?

If I had to do a CA, I would first fit a nice turbo, GT30 or a nice T3/T4 combo and a management and make 200kw without a problem and retain it streetable. Fullrace is another story.

I am asking because that is what I did, I did not have it on the dina yet to see if there is a diff but it does not hurt to estimate if the setup will make a diff.

the .64 turbine housing does wonders, power is smoother, turbo runs cooler and makes more topend power. The A/R80 comp housing will improve flow a bit but nothing major as it's not the housing doing the pumping work, it'll be an improvement over a stock turbo but not a killer turbo.

Ok, I had a ar48 compression housing and the exhaust was ar54 if I am not mistaken....well at least I will do a bit better...thanks.

The cam.....but does it really make a big diff on a turbo motor

I beg to differ, I just fitted one and it made a moer of a difference to the torque and I bet with the correct fueling (which it doesnt have right now) it will make a good difference at the top end rpm.

What you are trying to compare is like the Toyota 4AGE and CA18DET, just because they both have 16 valves doesnt make them the same.

But yes by lowering the CR and boost the car will make less power than it would a higher CR and more boost but still might make more power than std. If the parts that were changed were restricting the motors "flow" then at a lower boost lower CR it can still make more power than std. I know for a fact that the manifold is a HUGE restriction and the intake cam makes a wonderful difference.

You guys should go look for a CA18DE cam before you get it dyno tuned, a cheap mod aswell.

Stock is a AR49 for the turbine housing, I've got 2 at home if someone wants one, hehehe. But ye, it'll be better.

Gary57 wrote:

The cam.....but does it really make a big diff on a turbo motor

I beg to differ, I just fitted one and it made a moer of a difference to the torque and I bet with the correct fueling (which it doesnt have right now) it will make a good difference at the top end rpm.

What you are trying to compare is like the Toyota 4AGE and CA18DET, just because they both have 16 valves doesnt make them the same.

But yes by lowering the CR and boost the car will make less power than it would a higher CR and more boost but still might make more power than std. If the parts that were changed were restricting the motors "flow" then at a lower boost lower CR it can still make more power than std. I know for a fact that the manifold is a HUGE restriction and the intake cam makes a wonderful difference.

You guys should go look for a CA18DE cam before you get it dyno tuned, a cheap mod aswell.

Did you fit both in and out or just out?

Cams do make a difference but makes a better improvement when used with a larger turbo. problems can occure when you use to long duration cams with a small turbo as the backpressure on small turbo is very high, so "backflow" and contamination ocure with valve overlap. another problem is running longer duration cams move the powerband higher up the rev range and if you run a small turbo that's not able to supply the flow needed at that rpm then is sort of a waste. For street applications short duration cams like 254deg and higher lift (but calculated according to the valve size and portflow) will give nice results.

I just fitted the inlet cam, the exhausts cams are the same. The CA18DE cam has 1mm more lift and 8 degrees more duration. I cant tell you the exact power difference because the car is going on a different dyno and has a bigger FMIC and exhaust manifold since the last tune, but I can deffinately feel a difference since I fitted the cam.