Jump to content
SAU Community

Recommended Posts

Hi guys, I just got my car tuned with Atr43g3 and it didn't make as much power as I was hoping, infact compared to most other results it's a fair way off.

The car made 320rwhp @ 16psi, now the problem is that when the tuner pushed more than 16 psi it would gain midrange power but the top end would drop off. As it stands it made 300rwhp @ around 4500 rmp & only gained an extra 20 hp over the rest of the rev range which suggests that there may be something wrong.

The specs are:

Rb25det (130000kms)

front mount intercooler

Full 3" exhaust

3" metal intake

850cc injectors

Z32 afm

Brand new oem coil packs

Power FC

Now this car made 255 rwhp with the stock turbo @ 11psi & I would have thought that this turbo would have easily pushed 350-360wrhp (260+rwkw) So does anyone have any ideas?

Also, those figures were on a hub dyno.

Link to comment
https://www.sau.com.au/forums/topic/377949-atr43g3-low-power/
Share on other sites

  • Replies 105
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

Blocked Cat converter?

Shit exhaust?

Shit Intercooler?

Could be any of those

Yeah I did think about those, but the exhaust & cat are in good condition & there are no restrictions there but I haven't tested the intercooler. It is a HKS cooler but I guess its possible that here could be something wrong.

Aslo, could it be a valve train issue, ie valve float causing a boost leak?

how do you know there is no restriction?

did you drop the exhaust and run it?

Valve float is a possibility, but would show up as dips in the power curve.

Yeah we did drop the exhaust & test.

Well there are no dips in the curve, the curve looks pretty good (albeit a little laggy) its just down on out put. I will post up the dyno sheet when I get home tonight.

How healthy is the engine?

Any blow by or anything like that?

Starting to run out of options haha

Cam timing could be out?

But apart from that the turbo is another possibility, if you changed nothing else apart from the turbo that could be it.

Or it could be the tuner?

How healthy is the engine?

Any blow by or anything like that?

Starting to run out of options haha

Cam timing could be out?

But apart from that the turbo is another possibility, if you changed nothing else apart from the turbo that could be it.

Or it could be the tuner?

Tuner reckons the engine is pretty healthy, there was a slight film of oil in the cooler pipe but there is bugger all blow by really.

As for timing, to be honest I haven't checked but I would have thought the tuner would have picked that up? Maybe not.

I wouldn't think its the tuner tho, he's one of the best in Perth & has tuned both SimonR32 & Hanaldo's cars with similar (although smaller) hypergear turbo's with impressive results.

In saying that though, I'm not ruling anything out at the moment.

Of course logically the turbo could be the culprit but seems strange that it would make 300hp fairly easily & then just stop making power?

Did adding boost add power? Or did it keep falling over?

No, it didn't make any more power at all. The midrange improved but the top end just kept falling over, which to me sounds like a restriction somewhere.

We are going to re tune on the weekend with E42 (mix of E85 & 98) to see how it responds to that but it should be making a lot more power already.

Just thinking, you havent left a rag or something in the intercooler pipes after changing the turbo.

Sounds dumb but just about everyone has done it.

Hahaha I don't think so, BUT I don't know 100% The tuner had the cooler pipes off as well because it kept popping them off so its definately a possibility.... Might explain why its a little more laggy than I thought it would be :blush:

I will check tonight but I'm pretty certain that isn't the issue.

No, it didn't make any more power at all. The midrange improved but the top end just kept falling over, which to me sounds like a restriction somewhere.

We are going to re tune on the weekend with E42 (mix of E85 & 98) to see how it responds to that but it should be making a lot more power already.

Was there knock? Fuel shouldn't affect anything unless you were getting detonation.

Does Sean have any ideas? Has he checked your EGT's and intake temps??

Edited by Hanaldo

interesting, let me guess this hyperdrives dyno or ovaboost. forget comparing dyno output's from eastern states dyno's if it is on either of those 2.

My old 34 barely made 290hp on hyperdrives yet cars with the same turbo on the east coast were making 350 or some thing silly and my R34 with a RB3025 running a GT3576 made only 370. I have also seen a r33 on hyperdrive's dyno make about the same as yours with a proper GT3071 so it just reads super low compared to other machines.

So what I would suggest is throw the dyno sheet in the bin and take it down the 1/4 mile. As long as it pulls like 14 yo school boy you should be happy.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Who did you have do the installation? I actually know someone who is VERY familiar with the AVS gear. The main point of contact though would be your installer.   Where are you based in NZ?
    • Look, realistically, those are some fairly chunky connectors and wires so it is a reasonably fair bet that that loom was involved in the redirection of the fuel pump and/or ECU/ignition power for the immobiliser. It's also fair to be that the new immobiliser is essentially the same thing as the old one, and so it probably needs the same stuff done to make it do what it has to do. Given that you are talking about a car that no-one else here is familiar with (I mean your exact car) and an alarm that I've never heard of before and so probably not many others are familiar with, and that some wire monkey has been messing with it out of our sight, it seems reasonable that the wire monkey should be fixing this.
    • Wheel alignment immediately. Not "when I get around to it". And further to what Duncan said - you cannot just put camber arms on and shorten them. You will introduce bump steer far in excess of what the car had with stock arms. You need adjustable tension arms and they need to be shortened also. The simplest approach is to shorten them the same % as the stock ones. This will not be correct or optimal, but it will be better than any other guess. The correct way to set the lengths of both arms is to use a properly built/set up bump steer gauge and trial and error the adjustments until you hit the camber you need and want and have minimum bump steer in the range of motion that the wheel is expected to travel. And what Duncan said about toe is also very true. And you cannot change the camber arm without also affecting toe. So when you have adjustable arms on the back of a Skyline, the car either needs to go to a talented wheel aligner (not your local tyre shop dropout), or you need to be able to do this stuff yourself at home. Guess which approach I have taken? I have built my own gear for camber, toe and bump steer measurement and I do all this on the flattest bit of concrete I have, with some shims under the tyres on one side to level the car.
    • Thought I would get some advice from others on this situation.    Relevant info: R33 GTS25t Link G4x ECU Walbro 255LPH w/ OEM FP Relay (No relay mod) Scenario: I accidentally messed up my old AVS S5 (rev.1) at the start of the year and the cars been immobilised. Also the siren BBU has completely failed; so I decided to upgrade it.  I got a newer AVS S5 (rev.2?) installed on Friday. The guy removed the old one and its immobilisers. Tried to start it; the car cranks but doesnt start.  The new one was installed and all the alarm functions seem to be working as they should; still wouldn't start Went to bed; got up on Friday morning and decided to have a look into the no start problem. Found the car completely dead.  Charged the battery; plugged it back in and found the brake lights were stuck on.  Unplugging the brake pedal switch the lights turn off. Plug it back in and theyre stuck on again. I tested the switch (continuity test and resistance); all looks good (0-1kohm).  On talking to AVS; found its because of the rubber stopper on the brake pedal; sure enough the middle of it is missing so have ordered a new one. One of those wear items; which was confusing what was going on However when I try unplugging the STOP Light fuses (under the dash and under the hood) the brake light still stays on. Should those fuses not cut the brake light circuit?  I then checked the ECU; FP Speed Error.  Testing the pump again; I can hear the relay clicking every time I switch it to ON. I unplugged the pump and put the multimeter across the plug. No continuity; im seeing 0.6V (ECU signal?) and when it switches the relay I think its like 20mA or 200mA). Not seeing 12.4V / 7-9A. As far as I know; the Fuel Pump was wired through one of the immobiliser relays on the old alarm.  He pulled some thick gauged harness out with the old alarm wiring; which looks to me like it was to bridge connections into the immobilisers? Before it got immobilised it was running just fine.  Im at a loss to why the FP is getting no voltage; I thought maybe the FP was faulty (even though I havent even done 50km on the new pump) but no voltage at the harness plug.  Questions: Could it be he didnt reconnect the fuel pump when testing it after the old alarm removal (before installing the new alarm)?  Is this a case of bridging to the brake lights instead of the fuel pump circuit? It's a bit beyond me as I dont do a lot with electrical; so have tried my best to diagnose what I think seems to make sense.  Seeking advice if theres for sure an issue with the alarm install to get him back here; or if I do infact, need an auto electrician to diagnose it. 
    • Then, shorten them by 1cm, drop the car back down and have a visual look (or even better, use a spirit level across the wheel to see if you have less camber than before. You still want something like 1.5 for road use. Alternatively, if you have adjustable rear ride height (I assume you do if you have extreme camber wear), raise the suspension back to standard height until you can get it all aligned properly. Finally, keep in mind that wear on the inside of the tyre can be for incorrect toe, not just camber
×
×
  • Create New...