DPJ's GTRS Eliminator Install and Development

[UncleFester]

So WG duty cycle must be Wastegate? Does that indicate how much % of capacity the turbo is working at?
( complete turbo novice trying to work out what all the figures mean)

Ok how the heck did you work that out - if you could put it in laymans terms it would be appreciated

 

[DPJ]

So WG duty cycle must be Wastegate? Does that indicate how much % of capacity the turbo is working at?
..

It's the percentage of the time that the N75 is keeping the wastegate closed.

 

[UncleFester]

Thank you - so the longer it is closed the better? I am guessing that wastegate opening is to release excess / unwanted boost?

Just looked at the figures again, skype had done something odd to the formatting on the last set of data - i can at least see where the figures come from now.

 

[DPJ]

Thank you - so the longer it is closed the better? I am guessing that wastegate opening is to release excess / unwanted boost?

Yes, but more to control the boost level. Remember the N75 controls the wastegate actuator by pulsing it open and closed rapidly. If you look at the log above, the wastegate starts off 100% (closed) and as the power rises, it starts to be open more and more of the time.

 

[UncleFester]

So that's how you measure how much power you're putting out at what rpm / gear ..... what would be an optimum reading for the wastegate and is it better when it's able to be held further open for longer periods of time?

 

[PhilW]

Whats LB9 equal to dave? HB5?

Thats gonna be awesome when your running a decent FMIC.

 

[wild willy]

Nice logs Dave ,
Time to up the timing and boost a little me thinks.

 

[DPJ]

So that's how you measure how much power you're putting out at what rpm / gear ..... what would be an optimum reading for the wastegate and is it better when it's able to be held further open for longer periods of time?

Big question Fes! There's better people than me to answer the question and it would be worthwhile posing it elsewhere. I think it's a combination of boost / fueling & wastegate efficiency (etc)

Whats LB9 equal to dave? HB5?


Thats gonna be awesome when your running a decent FMIC.

B6 on a newer SPS3 I think Phil - but whether that's so applicable with Revo Stage 3 -

Nice logs Dave ,

Time to up the timing and boost a little me thinks.

Cheers Carl! It's a bit of a leap into the unknown so I was a tad nervous. I cut at just over 6k, but it would have kept going.... I should leave it until the FMIC is fitted now, shouldn't I....
I'm a tad concerned at what's going on sub 4k (ie not a lot)

 

[Martyn]

Deffo leave the timing until the FMIC etc is fitted. You might well find the sub 4k performance improves once you've sorted the breathing out.

 

[DPJ]

Deffo leave the timing until the FMIC etc is fitted. You might well find the sub 4k performance improves once you've sorted the breathing out.

Thanks Martyn! Good to have your input.

 

[Martyn]

Are you going to keep the N75 Dave or will be be running an EBC like the Apexi?

 

[DPJ]

Are you going to keep the N75 Dave or will be be running an EBC like the Apexi?

I intend to stick with the N75, Martyn - I'm not (at this stage) intending to take it to the limit.

 

[Martyn]

Fair one bud, look forward to more updates

 

[Wilko]

It's a bit of a laggy mofo dave. Similar to other eliminator logs I've seen.

I'm getting 1 bar boost by 32-3300 and 1.5 bar by 3700 a,d 1.8 bar by 3900. Similar spool when I was on a vf34. N75 work fine on mine at 2 bar boost.

Waste gate duty is very un linear. unplug your n75 and you'll make 1 bar boost at the top end (so at 0 duty)
Plug it in and you make 1.25 at 50% duty. Wind it up and you'll be 100% duty cycle making 1.5 bar boost at the top end.
Waste gate is a 20-30mm hole, so open or shut you'll only effect flow through the turbine by 25% or so.

 

[Ruddmeister]

I intend to stick with the N75, Martyn - I'm not (at this stage) intending to take it to the limit.

Logs look good as far as my limited knowledge can tell (CF's as expected at this low stage of tune are minimal etc) and I suppose one plus of this awfull weather is nice low temps for induction.

The question I want to ask though is how does the car drive on the road, performance compared to your old maxed out KO3s

 

[DPJ]

Logs look good as far as my limited knowledge can tell (CF's as expected at this low stage of tune are minimal etc) and I suppose one plus of this awfull weather is nice low temps for induction.

The question I want to ask though is how does the car drive on the road, performance compared to your old maxed out KO3s

The honest answer to that, Steve, is I don't know yet. Apart from a couple of squirts, the only time I've done WOT to the line is those power runs. I've only done about 75 miles since I got it back on the road and I've been running looking for probs/leaks etc. I'm letting Mrs DPJ use it for her 1 mile to work and I'm having doorhandle scraping fun in her car.(what grip? - one 'controlled' slide) Driving normally, it seems as flexible as before. It does seem to bog down at under 4k when it's floored.

 

[Martyn]

I still think that some of the 'lag' will be caused by the downpipe and stock IC piping. The rest of lag is / will be a 'feature' of the turbo. IMO of course.

When I popped into JKM the other day we chatted about turbos and they mentioned that they tend to favour other turbos over the ATP ones due to the lag they appear to have.

 

[DPJ]

I still think that some of the 'lag' will be caused by the downpipe and stock IC piping. The rest of lag is / will be a 'feature' of the turbo. IMO of course.

That's what I'm hoping, Marts.

Wooohooo! The Pro Alloy metal pipework for my Forge LCR intercooler install just turned up at work.

 

[Martyn]

Where are the pics then?

 

[DPJ]

Where are the pics then?