Toyspeed.org.nz Message Board

by **vr4boy** » Wed Oct 26, 2011 2:02 pm

was looking at getting a set of 50mm straight ram tubes for my silvertop to go inside the standard plenum? is this worth doing? be good to hear what people have to say before i buy them, cheers.

by **ch4ng** » Wed Oct 26, 2011 3:44 pm

Ive got a set of 33mm? Imec ramtubes inside the plenum of my blacktop. Havn't had it on a dyno to see if there were any gains or losses but *the butt dyno* says it feels better from 5000-8000 RPM

by **Mr Revhead** » Wed Oct 26, 2011 3:45 pm

Or is it worse below and giving a false impression by suddenly coming right?

by **RedMist** » Wed Oct 26, 2011 3:50 pm

Mr Revhead wrote:Or is it worse below and giving a false impression by suddenly coming right?

And that Sir is almost certainly the case.

by **ch4ng** » Wed Oct 26, 2011 10:11 pm

Could well be but untill I can find some proof OR do some back to back dyno runs myself I will continue to grin all the way to 8000 RPM

by **Truenotch** » Wed Oct 26, 2011 10:59 pm

This could give you an idea of the difference longer trumpets make:

viewtopic.php?t=85774

by **KinLoud** » Wed Oct 26, 2011 11:06 pm

Butt dyno - pretty deceptive.
The apparent big power boost is almost always the engine just digging it's way out of a big hole in the torque curve.

Look on my video - gen3 3sge on the dyno with a short runner intake (about 1/3 length of standard one).
http://www.youtube.com/watch?v=LBzpnuE_oyM
At about 2.12 you can see the huge dip in the midrange torque and power with this intake. Also down on top end power.
Driving it it felt like a huge power boost at about 5000rpm but it was just the torque increase back to near normal!
About 1 second per lap slower at the old taupo track.

Ken

by **sergei** » Thu Oct 27, 2011 8:12 am

KinLoud wrote:Butt dyno - pretty deceptive.
The apparent big power boost is almost always the engine just digging it's way out of a big hole in the torque curve.

similar thing in my ST165, even though I gained 15kW at top and over 25kW at 4000rpm compared to previous tune, it feels a lot flatter now.

by **RomanV** » Thu Oct 27, 2011 9:17 am

+1 to the above.

My car felt faster when it had 20hp less, and a HEAP less low end due to airflow meter issues.

by **RedMist** » Thu Oct 27, 2011 9:19 am

KinLoud wrote:Butt dyno - pretty deceptive.
The apparent big power boost is almost always the engine just digging it's way out of a big hole in the torque curve.

It's funny how well setup race engines feel timid when compared to something with a huge torque hole in the power band. My 4age race engine was cammed to hell, felt strong below 5k then just a small push to 8800rpm.
Whereas engines with torque holes always demonstrate strong "butt dyno" results with little real world results.

by **Lith** » Thu Oct 27, 2011 9:47 am

I *love* deceptive/solid acceleration, the only catch to it is that (I've modified/tuned a few cars which have ended up with very linear pulls) people come out of them seeming almost like they reckon you are BSing them on the power figures, not that it really matters as typically the same cars will often end up equal to or quicker than more dramatic setups

One of the more frustrating cases for me was when we used some dyno time to tune a mates Mazda Lantis, we managed VERY substantial midrange torque gains by playing with the engagement of the variable resonance chambers in the intake manifold and got quite decent overall power figures for it for a little NA V6.... the owner had basically undone everything we did with that tune by the following weekend due to being convinced it was slower than it was prior to tuning, and went a step further and replumbed (now he knew how to do it after we'd sussed it out on the dyno) them so that they worked almost as inefficiently as they possibly could, giving the car a terrible flat spot. At least it felt dramatic for 500rpm of the rev range!

by **Mr Ree** » Thu Oct 27, 2011 1:39 pm

The placebo effect is powerful in you, my son

Website · by **Bling** » Thu Oct 27, 2011 2:54 pm

I hope you disowned them as a mate.....

No airbox, but filter socks on my Levin gave me a sweet noise and torque steer @ 7000rpm. Would have been interested to see how messed up the power curve was! For that half a second or less, the car felt faster.

by **Lith** » Thu Oct 27, 2011 3:53 pm

Mr Ree wrote:The placebo effect is powerful in you, my son

Don't pin this on me

by **strx7** » Thu Oct 27, 2011 3:55 pm

a well set up car should blow you into the seat from 3000rpm to redline

by **Lith** » Thu Oct 27, 2011 4:51 pm

strx7 wrote:a well set up car should blow you into the seat from 3000rpm to redline

Thats never going to happen with a 4AGE unless its in a gokart

by **1I1** » Thu Oct 27, 2011 4:52 pm

Or running a turbo

by **strx7** » Thu Oct 27, 2011 5:08 pm

1I1 wrote:Or running a turbo

thats the one.

that is why if you are building a motor. VVTI + Turbo = WIN.

by **Lith** » Thu Oct 27, 2011 5:30 pm

1I1 wrote:Or running a turbo

Only turbo 4AGE I have been in had nothing until 4500rpm haha

by **RedMist** » Fri Oct 28, 2011 8:53 am

Lith wrote:
1I1 wrote:Or running a turbo

Only turbo 4AGE I have been in had nothing until 4500rpm haha

Really bad turbo selection and/or installation.

My V6 turbo race engine pulls almost peak boost from 2700RPM (a little boost creap at 7500RPM) with two GT2871r's. It's currently pulling only 610whp on only 16PSI (IAT's too high). So if you're spooling at 4500RPM, you've got some serious issues.

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ram tubes, worth getting??

ram tubes, worth getting??

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