R34 Gtt Rb25Det Weird Dyno Results

[Soltek2002]

Hey All

Just recently had a Nistune computer installed in my car and tuned
Mods Completed
Stock Bottom End 150,000km (Good compression)
Automatic Box with Shift Kit
Stock Manifold
Turbo - Turbonteics Series 60-1 billet 61/82mm comp wheel, F1-62mm ex wheel. 0.65 ex housing
540cc Injectors
Z32 AFM
Tial MV-R 44mm Wastegate directly welded onto exhaust housing
Tomei Poncams - 260 degree
Tomei FPR
GFB Electronic Boost Controller
Tial BOV
Blitz FMIC

There aren't any tuners really familar with the Nistune software in Auckland so I struggled to get it tuned.
Ended up taking it to a highly respected Auckland based tuner who said he would give it a go.

The graphs just seem a little weird to me but keen to hear your feedback

[Manuel Kasko]

Looks pretty fine to me, the dip in the power graph at around 4200rpm is I believe because of the external gate opening once it hits full boost.

Looks fairly laggy though with the boost and the power delivery. Maybe someone with knowledge about the actual turbo could chime in.

The boost also seems to drop off a fair but towards the end of the rpm so that's why your top end power isn't a little more aggressive. Not sure if this was the way the turner set it up or of he had trouble with holding boost. External gate should have prevented that though.

[Soltek2002]

The turbo is Journal bearing so this may count for some of the delays the turn is rated for 600hp and designed for boost levels below 22psi. I had some concerns about the boost as well but just wanted a few second opinions. Also the amount of boost in relations to the power seems less then I expected

[Manuel Kasko]

To be honest I can't even read the boost graph because I only really understand psi

Is the graph is in bar?

[KiwiRS4T]

Would have been interesting to see it with stock cams. How much power were you expecting to make? Z32 AFM won't reach to 600 hp.

Andy from X-tune is familiar with Nistune but he's quite hard to get hold of. I am pretty sure the tuner at Torque Performance does them too but having said that I'm sure it didn't take Soichi long to find his way around it.

Are you able to lock the auto in gear for tuning?

[Soltek2002]

Yup it was locked in 3rd for tuning. I was expecting closer to 300kw after comparing it to alot of similar setups here on SAU. I tried to build the setup for responce with a large compressor wheel (similar to a T350) on a T3 shaft and slightly larger billet compressor wheel to help boost build quicker but still retaining the weight of a smaller wheel.

The Cams were also there to bring that torque curve down lower slightly. I'm not sure what it would have been like stock cams

On a side note there are plent of people on the SAU forums making 300kw+ with a Z32 AFM. I spent a week trawling both the Unopened 300KW+ RB25DET thread and the RB25DET Dyno sheets.

Oh and trust me I have no doubt of Soichis ability with the RB hes a freaking genius with it.

Edited July 15, 2014 by Soltek2002

[Ben C34]

The peak at 4000 is likely caused by convertor slip.

Did you tell him to not rev it higher?

Did he play with the vct switch point or dial the cams at all?

[WMDC35]

Doesn't look too bad for auto, did Soichi make any comments?, good luck getting hold of Andy!, it's only on 98?, as Bob says would be good to compare to std cams

[Soltek2002]

The peak at 4000 is likely caused by convertor slip.

Ok should I see what MV Automatics have in stock?

Did you tell him to not rev it higher?

He said he didn't want to change the rev limit

Did he play with the vct switch point or dial the cams at all?

Not sure but we gave him the Nistune manual

Doesn't look too bad for auto, did Soichi make any comments?, good luck getting hold of Andy!, it's only on 98?, as Bob says would be good to compare to std cams

Soichi said he didn't like the auto and didn't like nistune. Its running Force10 (98 with 10% Ethanol) and I put the cams in for the torque curve. But they say that cams add 10rwkw

Edited July 15, 2014 by Soltek2002

[WMDC35]

Unfortunately the Nistune isn't used much in Auckland, at least Soichi has had a go & got the car running not too bad.

The auto will always read lower, also all the E results on SAU will usually be higher than ours

[scotty nm35]

Unfortunately the Nistune isn't used much in Auckland, at least Soichi has had a go & got the car running not too bad.

The auto will always read lower, also all the E results on SAU will usually be higher than ours

No idea why, the Nistune is very capable.

Of course Auto will read lower, but why the dyno's? Are they powered by sheep or something?

[WMDC35]

Just saying the OP may be looking at e85 results and expecting similar, yes our dyno's are powered by sheep & fush & chups oil

[Ben C34]

Mv can't help with the convertor. They slip. That's what happens. There is a lockup clutch in there. It Is nicer on the clutch to start a pull when it is fully locked , eg at 2800 rpm and light throttle then apply full throttle just be for run starts. Autos are a bit of a pain on the dyno...

Mv don't make convertors anyway, they get them done else where.

It would have been interesting to change the vct switch point, as the power really picks up at 5500 which is where vct turns off.

I noticed on the nistune site you posted your tune, can't you look at it and and see what he did with vct? It looks like if the vct was switched off earlier the curve would be nicer.

I don't think each each setup responds the same with vct switch point coupled with manifold and cam differences. For example I run type B's in my 2530 and they liked the switch point later, perhaps due to the extra air flow of the 30 or restriction of the stock manifold.

[Soltek2002]

Just saying the OP may be looking at e85 results and expecting similar, yes our dyno's are powered by sheep & fush & chups oil

Looked at both 98 tunes and E85 and took the reduction in power into consideration. I spent lots of time going over each one carefully. Sheep powered dynos... Lol

[Soltek2002]

Mv can't help with the convertor. They slip. That's what happens. There is a lockup clutch in there. It Is nicer on the clutch to start a pull when it is fully locked , eg at 2800 rpm and light throttle then apply full throttle just be for run starts. Autos are a bit of a pain on the dyno...

Mv don't make convertors anyway, they get them done else where.

It would have been interesting to change the vct switch point, as the power really picks up at 5500 which is where vct turns off.

I noticed on the nistune site you posted your tune, can't you look at it and and see what he did with vct? It looks like if the vct was switched off earlier the curve would be nicer.

I don't think each each setup responds the same with vct switch point coupled with manifold and cam differences. For example I run type B's in my 2530 and they liked the switch point later, perhaps due to the extra air flow of the 30 or restriction of the stock manifold.

Will have to find out if there is a NZ supplier of Convertors if this is what is giving me greif.

I posted there and here as I know that these are the 2 largest knowledge bases. Soichi is giving it a tune up as the cold start was quite rough.

Might have a play around with the VCT myself and see if that can bring the power in any differently though it will be a rough gauge through road testing.

[RS500]

i'm not too sure about how autos behave on dynos, although you do realise that you're boost level is only at 17.5psi dropping to 15psi.

id expect this turbo to start waking up at a minimum of 20psi so maybe first thing is to install a stronger spring in your wastegate and then turn the boost up a little more.

btw, the first graph shows 295rwkw, that's quite respectable power there.

[KiwiRS4T]

Seriously you need a manual conversion! Its not a matter of the auto reading lower its the real extra transmission losses resulting in less power being available at the wheels where you want it. I looked back at my old graphs from when I had an auto and they were similar to yours. My graphs now are much smoother and the boost is rock steady (G4 Link with Synapse external W/G).

Regarding the cams my understanding is that the cams you have fitted will shift the torque upwards so yes another 10kw max but less poke lower down.

VCT is normally set with one run with VCT turned off and one on to see the optimum change points.

And yes Z32 AFM will do 300 - 350 kw but not 450.

Bottom line is your car should be pretty zippy with the power you have now!

[hypergear]

First of all it appears the Standard Dyno meter interpretation used in NZ is DIN. Using that interpretation, the reading is higher then what it usually would be is in OZ.

The bush bearing turbo does not have an affects in terms of strangeness in the curve, how ever the response is slightly affected by oil temperature.

The Blue run of 285rwkws had a different name on it, That is not from your car is it?

The power level seems to be ok for the amount of boost given and auto transmission.

[WMDC35]

No DIN is not the standard in NZ, Don't know why sometimes the ST Hitec results are done that way

[Ben C34]

No DIN is not the standard in NZ, Don't know why sometimes the ST Hitec results are done that way

It's not a big deal.

Op is going back for a touch up tune so can ask for a reprint with whatever correction standard applied. It's stored as part of the file so can be changed later. That way you can pick the one that gives the highest power.......