BoostdR

Response is effected dramatically by wastegate tension I have found.

Agreed it's a weird figure that's at the rear wheels. Makes no sense and is definitely not 1700nm and a reference-able figure. Good for highlighting the torque curve only. It's certainly making decent torque. I just need to connect the rpm trigger on the dyno next time to get a normal type of output. Will do this when I get around to actually tuning the timing. Only running 16.9 degrees ATM. Keen for AIR also. Need to fix the damage from it coming off the dyno first.

Yep. 1st gear is all wheel spin. When it changes to 2nd it grips and the speed highlights this. I have logged a run at 0-100 in 3.3sec. Still with lots of wheel spin. In need of some sticky tyres.

Currently running 16.8 degrees timing in 3rd gear. I increased timing by 5 degrees this morning and it was considerably quicker. Smoking all 4 tyres on accel. My concern is however the timing is gear specific as controlled by the OEM ECU. Increasing the timing that suits 3rd will cause huge timing figures in the lower gears...possibly explaining why Tao's M35 exploded in 2nd gear at part throttle. There is a speed vs fuel map in the EMU however no speed vs timing. I might look at translating speed to a 0-5v signal to utilize the temp vs timing map in the EMU since the OEM ECU handles that anyway. There is no question we have more power to be extracted. I just want to be smart about how it is controlled.

The bumper has a small chunk taken out from the cooling fan. I'll have to get underneath it and check the arms. Haha. No NOS for me

Ok have some results. First run the car broke the tie down straps and jumped off the dyno crashing into the cooling fan... Quick lesson for me on how much torque this thing now makes. 325.6awkw 1300lb torque @ 28psi on E85. I ran out of time to actually play with the tune(fuel and timing) keen to find out what's left on the table. This result is a generic street tune. This is a 3rd gear run in manual mode. The runs are different due to me working out how much I can put the throttle down without it kicking down a gear. I worked out I could place full acceleration down at 110km/h. Prior to 110km/h is around 40% throttle. These runs had 5 tie down straps tensioned very hard so would sap a smidge of power. Maybe 5-15kw....not that it matters I still have to actually tune it. Timing is currently conservative. I removed the K&N air filter from the OEM airbox which is MAFLESS and 80mm to 3" piping. Made only 3kw more. Future plans: Change exhaust. Current one has a damaged 3" center muffler blocking 20% flow Play with the timing and AFR After coming off the dyno

M35 Torque Convertor / front pump assembly auto trans seal. Symptom, oil coming from between gearbox and transmission

Scotty's dump pipe is a better option. The stock turbo already has a divider inbuilt.

https://youtu.be/If-oqoWb3_s Lowest boost setting. 20psi 1st 22psi second. Getting more and more impressed with the outcome. Fuel flow and dyno next Matt

Daily driving impressions and characteristic videos. One of the videos show the throttle position % vs rpm. Boost you can hear pretty easily. All accelerations are at less than 30% throttle. The turbo makes positive boost pretty much straight from idle making a very nice car to drive normally. https://youtu.be/eRinBPPfc4E https://youtu.be/WGvDESNwCEk https://youtu.be/2UfivPZ1ra8 Matt

On E85. That log was the one and only run I did at the load. Boost is now down on min which is 22psi with the stiff wastegate can screwed up 4mm preload. To be honest I'm pretty impressed my VQ25DET has held together at the power levels it runs. The head studs seem average...prob the weak link(and possibly saves the engine from excessive pressure). I think Scotty has mentioned this previously. My next step is to work out if the pump is out of flow or the injectors are actually out of flow. May have to look at higher fuel pressure.... Hoping it's the pump. Matt

The latest Hypergear CBB is on. Boost Capacity vs Gear (max boost)` SS2 Rev4 - CBB Rev2 - CBB Rev3 1st 17 21.4 26.5 2nd 20.5 24.2 28.4 3rd 23.2 28 31.5 Observations: - The weird space ship spool noise is 100% gone. No idea what's changed to assist this. - My injectors are now at 100% duty cycle in 1st-5th gear. Previous turbo touched 100% in 4th-5th only - Car is now lean everywhere. 17:1 AFR at 2000-3000 20% throttle. 12.9:1 AFR at 100% throttle 7000rpm - I don't need drive in manual mode to hold the car near the boost zone. There is plenty of low down/part throttle power available for everyday driving. -I did notice the car ping. Hopefully it is related to the lean mixtures Summary: New revision has achieved the goal of obtaining more average power in the first 3 gears and a higher boost capacity. The previous turbo's responsed well in 3rd and above however lacked torque in the lower gears. For a street car I wanted the most available average torque from 1st to 3rd. I was more than happy to sacrifice some power from 3rd or 4th to gain more average power down low. Very happy to report that the entire boost threshold has increased enabling me to make up for the estimated loss of 14kw(smaller turbine) whilst at the same time increasing my average torque in the lower gears. Boost % difference under the curve and in the spool zone is in the order of 20-60% increase. I transferred the log data from all three turbo's I have tested to graphically represent the differences in response. The lean readings backup the additional flow that this turbo delivers low down(due to the smaller turbine) and additional flow up top(due to the higher boost capacity) Graphs: -Turbo response comparison -Greddy log data. Note dark blue line(injector duty cycle), higher boost threshold in all gears and lean AFR. Matt

I haven't checked OEM pressure, I would assume 43.5 psi with the vac line removed. Would be worth checking the spec. I would also check the Oxygen sensor...is it average on fuel?

Are you sure the wastegate actuator isn't stuck open from sticking to the dump pipe flange?

Check fuel pressure, check manifold for leaks or cracks. Lean code could also be a misfire. Coil packs or plugs.

Some development updates to the higher power end of the M35 Hypergear highflow. Revised Collar and 2mm smaller turbine. The smaller turbine also enables the turbine and wastegate divider to remain with the Venturi cutout. This will reduce turbine discharge turbulence and encourage wastegate flow. Will post up comparative log data and driving impression video again once installed. Matt PS this is a hobby for me and work is flat out so may be a couple of weeks before another update.

The whole turbo unit won't fit without major modification. The M35 unit is a vehicle specific unit...= weird shaped turbine housing

The GTRS turbine is 46.95mm. The factory is closer to 42mm on the exducer. But the core would work with machining.

Looks like your in luck. Your turbine is a 10 blade and the stock is a 9 blade. Also looks to have a less aggressive trim, meaning more flow.

Ceramic wheel will fail when boost is above stock(an even on stock boost). Just a matter of when. You could go to a bigger turbine at the expense of spool. Would gain power, reliability however. Be very careful about going too big a turbo as they don't work on an M35 without a huge amount of ancillary work. That turbo with one of Scotty's dump would drive fantastic. Double check the turbine wheel material. Hard to tell from the picture

Wow. That got out of hand quickly. I did not infer your turbo Scotty was shite at all...even recommending it, didn't even know it was bush. To be honest I was referring to the Hypergear SS2 bush bearing being a dog to drive. And the fact that all bush bearing turbos have crappy transient response characteristics. If anyone is happy with their bush bearing turbo it is (A) very small and masks the added rotational friction or (B) has wheels and housings that match well enough to mask the added friction. Ball bearing will improve drivability every time and more so Ceramic. As for Hypergear giving me a free turbo that's not true either. I wasn't happy with my bush bearing SS2 so Tao offered to rebuild it to a configuration that I wanted. I've always said it like it is and backed up my thoughts with log data. I remember when I first talked to you Scotty on here. I asked for info and you sledged me saying "no one would give you that knowledge that took years to work out" I said that's not very information sharing like the forum is designed for and said I would work it out myself then post the information up for everyone to use. Which I've done just that. You did help me eventually with some wiring and I am thankful for that but don't sledge me with made up info. Not sure why you guys(select few) get so defensive of my comments all the time, like I have my own business and are going to steal work off you. Is it that Scotty has been the go to m35 man for so long and now the knowledge base is widening....For the record I work for the AirForce. Chill out I have no financial interest reflected in any of my comments. I was pretty vocal when my bush SS2 Hypergear turbo wasn't performing. Backing my comments up with logs and video. Tao is now making every effort to make better and from the learning curve is improving the whole range. Matt

1) An R33 GTST core can be used. I also have a M35 OEM core spare if you need one. They are getting hard to find these days 2)Plenty of options for stock replacement. Intense RS from Scotty or a highflow from Tao at hypergear. Just make sure you stay ball bearing as the bush bearing are dogs to drive. 3)Intake is ok up to about 220awkw. Block off the BOV bleed hole Matt

Looks like a bigger comp wheel with the standard turbine(also meaning ball bearing). I've seen the Japs do this. Would give good response with an improvement in power. The bigger comp would bring the turbine speed down a touch meaning you could prob get away with more boost before the ceramic turbine falls off. I wouldn't go over 18-19 psi. I would expect it to be very responsive...may even want to compressor surge. Matt

Oh and Borg Warners are not a bolt on so take your $3k and add on a new manifold, dump pipe, intake and lines.