8000rpms on the ca?

[nisssan-drive]

I read that you can run the CA at 8 grand with stock trim is this bs or not?

[themadscientist]

I have done it but I am not saying it was good. If you are not flowing air at that RPM why do it?

[nisssan-drive]

Well I was just trying too make sure that what i was reading was correct. Say if I had a ca18det and I was revving it at 8 grand. Wouldn't the motor start losing boost at 7 grand?

[themadscientist]

that depends a great deal on the turbo. A big turbo if the engine continues to flow well will continue to boost, a smaller one will begin to choke or if the engine starts to choke off flow the turbo will not boost more. Stock CA, keep it under 8K, you gain nothing by going higher IMO.

[nisssan-drive]

Damn... well i haven't bought one yet looking to get a motor in a couple of months. Trying to decide between a CA and a SR but, thanks for the help and advice.

[biosehnsucht]

An SR not only won't make power at 8k stock either, it most likely will trash the valvetrain.

The CA can take it - but unless you have the intake, exhaust, turbo, cams, fuel, etc to support it... all you're doing is wasting energy. You'd be way beyond the end of the power band.

[sideways danny]

I would NEVER rev standard rods and pistons past 7500rpm. Give yourself a safety margin. Unless you have a stupidly large turbo you'll be past peak power by then anyway

[nisssan-drive]

Well I wasn't planing on revving it all the way to 8 grand stock. Especially not on a sr. I new that it would take more boost to get power at 8 grand and that the little t25 wouldn't cut it. Whatever motor I get Its going to have its share on the track. Now say I did all the things necessary down pipe, upgraded turbo,cams and many other things to get power at 8 grand. Wouldn't the "performance" of the motor be better than one with the sam mods but only shifting at 7 grand?

It seems to me like you wouldn't be getting the full potential of this"built" motor.

[themadscientist]

Every engine is different and just because one engine continues to build power with revs does not mean the other will. At some point the ports and valves will reach their maximum potential flow and the power stops increasing. I would build a motor for 8000 and under. I don't get the obsession with revs.

[biosehnsucht]

I don't get the obsession with revs.

The Type-R mentality has infected all makes

[mmm240]

The Type-R mentality has infected all makes

I've never been a high revving wannabe until I realized that I can get good gas mileage (when off boost) and have good power (with turbo). It's just a win win situation with the CA (I think)

[themadscientist]

any turbo engine is more economical off boost, You can leave it stock and do that. No high revving required.

[dash]

Actually you do loose with a ca18. No low end torque

Even a beast won't 'need' 8000 rpms. You will need boost tho.

[mbmbmb23]

Actually you do loose with a ca18. No low end torque

Even a beast won't 'need' 8000 rpms. You will need boost tho.

Using the intended VLSD (4.36) helps.

[nisssan-drive]

youtube.

I hope its ok that I post this on here. This is an example of how to do it but a little over board with 490whp insane CA. If you don't want to watch the whole thing just start the video at 7:30 to see his revs.

[mmm240]

youtube.

I hope its ok that I post this on here. This is an example of how to do it but a little over board with 490whp insane CA. If you don't want to watch the whole thing just start the video at 7:30 to see his revs.

Fail

[nisssan-drive]

yes horribly oh well here's the link. http://youtube.com/watch?v=xzOLRXyATx4

[float_6969]

[mmm240]

yes horribly oh well here's the link. http://youtube.com/watch?v=xzOLRXyATx4

He doesn't drive that car very well (missing shifts and consistently banging off the rev limiter). Sounds like a ricer in his honda (I remember when everyone though it was cool to bang off the limiter). Doesn't get full boost til 6k, wonder why he takes it 8k

[nisssan-drive]

No he doesn't was hoping I wasn't the only one who noticed BUT im not saying I could drive a 490whp 240 very well yet either.

Any way it was just an example thought I would show you all.

[NUT-CSE]

What about the hydrolic lifters? At what RPM can they be taken to??

[themadscientist]

I used to speedshift mine at about 8500 in the heat of battle. I would be comfortable with 8K sustained on healthy lifters and good oil delivery.

[mmm240]

I used to speedshift mine at about 8500 in the heat of battle. I would be comfortable with 8K sustained on healthy lifters and good oil delivery.

Damn 8.5k. that's a bit more than I would want to go. I would be happy with 8k though. What supporting mods did you have to handle 8.5k?

[themadscientist]

when you are fighting 600hp RB26s with a 150hp CA18DE you need to do everything you can. The engine was bone stock but I had a lightweight flywheel, HKS header and a CA18DET wiring harness with 370cc injectors run by the DE computer and an SAFC.

I don't recommend it to others. While my valvetrain was pristine when I tore the motor down #1 con rod bearing was showing some serious wear.

It was the baddest Q Silvia anyone has seen around here. Kawasaki-san thought it was wild when he saw it at the drags. He always has a good laugh at the stuff I bring.

[mmm240]

when you are fighting 600hp RB26s with a 150hp CA18DE you need to do everything you can.

You sure are crazy

[themadscientist]

Played christmas tree games with him, cut a light John Force would respect and showed him taillights for 60 feet. He won of course but the idea that he had to chase me down to me is a moral victory.

[mmm240]

Played christmas tree games with him, cut a light John Force would respect and showed him taillights for 60 feet. He won of course but the idea that he had to chase me down to me is a moral victory.

Oh yes, brains over brawn

[dash]

if thats Mobnes' 497hp ca18 on the video.... he may have been getting used to the car at that power level.I think he did take it to an 11.2sec 1/4, which is about as god as it gets for what it is.

8k on a boosted motor also has to deal with boost at the backside of the intake valve... different ballgame

[nisssan-drive]

damn 11.2 pretty fast car man!

[NUT-CSE]

damn 11.2 pretty fast car man!

I saw a video on you tube of some japanese drag racing and there was a 240SX with a CA18DET and it ran a 9.9 second 1/4 mile. I will try and find the video.