[GeorgeSmooth]

As a lot of you know I live in Johannesburg South Africa which is 5500ft above sea level. Tuning of the car is a work in progress but I got a opportunity today to give the car a run on a dyno just to see where I am at with my "street" map. Runs where done with 93 and meth (CM10) and the temp was 30 degrees celsius with no cooling of the car. We have not touched the tuning much above 6000rpm as we had to make sure we had the fueling waxed at lower high torque rpms. Boost pressure was set at 19psi and tapered to 15psi at the higher rpm. The timing is also very conservative and I am confident to say that we can push 475whp in race trim comfortably. So far Chip Logic does not seem to have hit any barriers in the tuning of larger turbos using flash software.
A ten percent gain should be added for coastal figures.
The comparative graph is of the same car without the turbos and exhaust. A stock 335 makes 245-255whp on this same dyno so we looking at a full 200whp gain currently at this altitude. It would be nice to hear from some people who have done tests at high altitude to see how they compare.
The next step is to pour some race fuel and run the 19psi to redline and see how it reflects.

[enrita]

very nice man! did you see knock activity running 19 psi to redline without race fuel or is it just a precaution?

[dzenno]

Awesommmmmeeee congrats..

mine are going in this weekend, just waiting for all the OEM parts to arrive from Tischer

[GeorgeSmooth]

Originally Posted by enrita

very nice man! did you see knock activity running 19 psi to redline without race fuel or is it just a precaution?

Boost taper is just a precaution for now on this map as its far from finished. I was in the area of the dyno and just popped in so it was not a arranged thing with a map on to show max power etc. It was loading dyno and we held it for long at various rpm increments so its not so forgiving to the motor if something is wrong especially at high rpm load.

[dzenno]

So you're saying for sealevel guys it should be easily 500+ with 93+meth? what meth kit/mix did you use and how did you spray (I notice you have a single M10)..i have 94oct at the pump which I use 99% of the time...If it hits 500 on pump+meth I'll be extremely happy...however, my car dynoed around 262whp last time I checked with all boltons, pump gas, no meth, tune turned off so it might be just shy of 500...

1) what was your baseline number with the stock tune?

2) What type of dyno was this? I see 374hp before and 442hp after...what numbers are those? How did you arrive at 475 and an additional 10% for those at sealevel (i.e. 520+whp)?

[TheStig]

Great numbers,

[GeorgeSmooth]

Originally Posted by dzenno

So you're saying for sealevel guys it should be easily 500+ with 93+meth? what meth kit/mix did you use and how did you spray (I notice you have a single M10)..i have 94oct at the pump which I use 99% of the time...If it hits 500 on pump+meth I'll be extremely happy...however, my car dynoed around 262whp last time I checked with all boltons, pump gas, no meth, tune turned off so it might be just shy of 500...

1) what was your baseline number with the stock tune?

2) What type of dyno was this? I see 374hp before and 442hp after...what numbers are those? How did you arrive at 475 and an additional 10% for those at sealevel (i.e. 520+whp)?

Not sure what you asking me in number 1.

Its a HyperPower dyno made in South Africa. The 374 is the delta before turbos and 442 after. There is easily room for more boost and a ton more timing with race fuel so making 475 at this altitude is a walk in the park. The gains of these turbos seem to be the same as stock when you go from .7bar to 1bar cause it seems the efficiency range starts around 19psi.

[cocoturkey]

would the performance of RB turbos be much better than AWD billet turbos? the max whp of RB turbos seems to be higher... but the powerband of RB turbos seems to drop more quickly than AWD billet turbos. or it's just my imaginations.

[GeorgeSmooth]

Originally Posted by cocoturkey

would the performance of RB turbos be much better than AWD billet turbos? the max whp of RB turbos seems to be higher... but the powerband of RB turbos seems to drop more quickly than AWD billet turbos. or it's just my imaginations.

Its your imagination. The power drops off because I have purposefully let the boost out after 6000rpm as this is still in its early tuning stages.
As for AWD and their lighter billet wheel it seems it is not necessary as look at the power curve at the very low revs with the RB's, it is far better than stock turbos.

[enrita]

a full upgrade kicks the butt of all clipped turbine upgrades.

[jpsimon]

Originally Posted by enrita

a full upgrade kicks the butt of all clipped turbine upgrades.

indeed. great results so far, keep em coming!

[Duncanp64]

Very nice George!

[dzenno]

In question I was asking to see if you had a dyno graph from that same dyno where you measured with stock boost and all the boltons you have with pump gas and no meth...Where does your car stand on the stock tune and all boltons basically ...

Other question I have now is I'm not clear on what you meant by "efficiency range starts around 19psi"?

Originally Posted by GeorgeSmooth

Not sure what you asking me in number 1.

Its a HyperPower dyno made in South Africa. The 374 is the delta before turbos and 442 after. There is easily room for more boost and a ton more timing with race fuel so making 475 at this altitude is a walk in the park. The gains of these turbos seem to be the same as stock when you go from .7bar to 1bar cause it seems the efficiency range starts around 19psi.

[GeorgeSmooth]

Originally Posted by dzenno

In question I was asking to see if you had a dyno graph from that same dyno where you measured with stock boost and all the boltons you have with pump gas and no meth...Where does your car stand on the stock tune and all boltons basically ...

Other question I have now is I'm not clear on what you meant by "efficiency range starts around 19psi"?

Certain turbos gain more per psi at certain points. i.e. A stock turbos biggest gain would be from stock boost to 14.5psi. From there and on it starts getting harder to make so much power per boost increment. The RB's do this much later and the gain from 17-18psi is massive. The gain from 18-19psi is great so it goes into efficiency at that point. Do some reading up on turbo maps and efficiency ranges and you will see that all turbos have a sweet spot.

[ciomas]

very impressive !

[dzenno]

Originally Posted by GeorgeSmooth

Do some reading up on turbo maps and efficiency ranges and you will see that all turbos have a sweet spot.

i know about turbo efficiency, definitely not an expert but enough to know what you're talking about...thanks!

[Penn999]

Originally Posted by GeorgeSmooth

Certain turbos gain more per psi at certain points. i.e. A stock turbos biggest gain would be from stock boost to 14.5psi. From there and on it starts getting harder to make so much power per boost increment. The RB's do this much later and the gain from 17-18psi is massive. The gain from 18-19psi is great so it goes into efficiency at that point. Do some reading up on turbo maps and efficiency ranges and you will see that all turbos have a sweet spot.

So you think the sweet spot for these turbos is 19psi, or greater? I know you have only begun testing but im asking...theoretically. I am very interested in these. Great numbers so far!

[GeorgeSmooth]

Originally Posted by Penn999

So you think the sweet spot for these turbos is 19psi, or greater? I know you have only begun testing but im asking...theoretically. I am very interested in these. Great numbers so far!

I am not sure but if its still gaining power per 1psi increment at this rate then it is far out of its efficiency range.

[Penn999]

Originally Posted by GeorgeSmooth

I am not sure but if its still gaining power per 1psi increment at this rate then it is far out of its efficiency range.

Awesome, I cant wait to see as you up the boost little by little. Have or can you do a dyno without meth?

[ultimateracing335]

Good job Yiorgo!!! I just received my JB4 today so ill be on the dyno this week. Did you break in the turbos?? Is it necessary?

[Enicinitas]

RBs seem to be the twin turbo upgrade of choice from their dynos and their components (new wastegates - HUGE). Time and dynos will tell though.

[GeorgeSmooth]

Originally Posted by ultimateracing335

Good job Yiorgo!!! I just received my JB4 today so ill be on the dyno this week. Did you break in the turbos?? Is it necessary?

Thanks, you do not need to break in the turbos.