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Hypergears Atr43 G4 On Rb25det. My Result

kwickr33

By kwickr33,
in Engines & Forced Induction

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l0WRB Mentor

l0WRB

Posted
Posted

I thought the car was already tuned?

the r33 that got tuned last week with .5 front .82 rear 3582 chra, didnt make peak power until somewhere around 185-193kmph mark

this one with .7 front .82 rear makes its power 55kmph sooner? be good to see a few other dyno sheets with rpm boost afr

hypergear Grand Master

hypergear

Posted
Posted

I have built 2x GT3582 spec sleeve bearing turbos. One was sent to you in your KKR housing and .70 comp. The other one was built in .82 turbine with .50 comp.

With the 2nd turbo I virtually gave it away for free just to get a experience after receiving a complaint from you with the lag issue. It was not as bad as what you've experienced with the KKR housing.

That R33 had stock cams, internal gate and turbo didn't have any run in time. Straight on and dyno tune. So the polymolicue libricator that we used to stablise the shaft would have some affects on the response.

I'm going to get both cars to do another run in few weeks time so we can compare results, and see the differences that external gate and cams have made.

RB26 cefiro Newbie

RB26 cefiro

Posted
Posted (edited)
Nick believe KM/H is more accountable. I had a look through the dynosheet section and it seems KMH/RPM scale varies from dyno to dyno.

I'm taking a average sacle of:

1KM = 39RPM. So you can work it out:

65 : 2535

85 : 3315

105 : 4095

125 : 4875

145 : 5655

165 : 6435

175 : 6825

His dyno's analyzer is broken. it can only show Power , speed and torque at this stage. Probably can get the car to run on another dyno once its tuned.

kwickr33: Let me know when you want to run on more boost. I can cover your dyno time thats not a problem.

How is Km/h more accountable when your claiming spool speed in rpm. Wheel spin will root up Km/h.RPM/KMH ramp rate can change speed of spool slightly but engine rpm is directly proportional to engine/spool speed Unless your trying to dodge the printouts and running in 3rd. Rpm would be best to back up claims

Edited by RB26 cefiro
hypergear Grand Master

hypergear

Posted
Posted

The tuner believed in such, all tunes he've done for me and my customers cars are in KMH. I did question about scales in RPMS which that was his answer.

Also this is a roller dyno, if it does not read the RPMS directly of the engine but accumulates it from KMH then his explanation do make sense

RB26 cefiro Newbie

RB26 cefiro

Posted
Posted (edited)
The tuner believed in such, all tunes he've done for me and my customers cars are in KMH. I did question about scales in RPMS which that was his answer.

Also this is a roller dyno, if it does not read the RPMS directly of the engine but accumulates it from KMH then his explanation do make sense

If it is a hub dyno like a dynapac then it would be a accurate account as long as you enter the correct diff and gear ratio figures. But the tuner is using a chassis Roller dyno which introduces many other factors the main being wheel spin, inertia and size of tyre/rim etc. Your tuner is using a mainline so there is no reason not to be able to show rpm as it can be picked up from either coil or injector unless he is either too lazy to hook up or there is a bit of smoke and mirror action going on. A log of also the boost/rpm would also show response

What ramp rate was it run up on??

Edited by RB26 cefiro
RB26 cefiro Newbie

RB26 cefiro

Posted
Posted
I thought the car was already tuned?

the r33 that got tuned last week with .5 front .82 rear 3582 chra, didnt make peak power until somewhere around 185-193kmph mark

this one with .7 front .82 rear makes its power 55kmph sooner? be good to see a few other dyno sheets with rpm boost afr

That would be because he rang the ting up in third gear instead of forth. Dont belive me 4th gear is 1.00:1 ratio 3rd is 1.302:1

So multipy his claimed 140km/h x 1.302 = 183kph which is close enough to call BS

hypergear Grand Master

hypergear

Posted
Posted

You are telling me he's driven 175KM/H on 3rd gear.

This was done on 4th gear. I was present duing the tune. Go to the dynosheet section and check every one elses reading that is on the 4th gear and see what's the average KMH they’ve run.

never mind. I will take a video for you on the next tune up.

RB26 cefiro Newbie

RB26 cefiro

Posted
Posted
You are telling me he's driven 175KM/H on 3rd gear.

This was done on 4th gear. I was present duing the tune. Go to the dynosheet section and check every one elses reading that is on the 4th gear and see what's the average KMH they've run.

never mind. I will take a video for you on the next tune up.

Power figure is very strange after 140km/h dead flat at 300kw for 35Km/h the power to 175. The power actual peaks above the 140kmh at 154 and 164. If it was at a fast enough ramp rate you could easily over speed car on limiter till then which can give that effect of dead flat power

hypergear Grand Master

hypergear

Posted
Posted

Well I'm not a dyno expert. I guess I need to ask Nick on Monday.

It was definitely run on 4th gear, I was watching him doing that. If rev limiter goes on and off I don't believe you will get a constraint power curve or have any incensement in speed.

Other thing is note where the peak is, The car had few slight miss up the top. which you can see from the inconsistence after 150kmh. Not sure if that could cause that.

Look. This car's coming back for further tuning in few weeks time. I will shoot some video footages so we are all clear.

  • 2 months later...

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