gtx 35r compressor wheel with a 3076r turbine wheel? i thought the 3076r turbine wheel didnt even work well with a standard 3582r compressor.

 

If im not mistaken,I think its the opposite... the exducer is from the 76mm and the turbine wheel of the GT35 which is 68mm... If this was an EFR it would be called a 76/68 lol

 

ok, that would be a much more logical choice. now that you mention it, i was talking about would be a gtx3082.

 

Datalogging shaft speed in the AEM EMS is very easy, we did it for Robert at FP on a few different turbos as he was developing them.

The EFR actually has a port for the sensor so it's even easier.

 

Yes sir!

 

in the meantime... while we get more info from leet...

How can one attack the surge problem on turbos? What things can influence on "surging"?

 

Some standalones do have active turbo shaft speed limiting. Particularly when used with anti-lag and pre-turbo butterfly valves.

I believe the one bent shaft in Europe was a 9180 in a T3 housing. First run down the track the turbo blew at like the 1000' mark and the car coasted to a low 9. Can't remember the type of car it was. Something light and full on drag.

 

I thought these turbos were designed for high boost pressures. 35 certainly isn't that high or the 28 it was ran at for the most part.

Maybe the shafts were made with poor metal quality.

 

Tspd sensor is available... and for those of you who can't use digital inputs... there is an analog converter.

Lucky me the Vi-pec has a digital input for frequency inputs! w00t.

 

depends on the engine. some could overspin it at 25 psi another wont at 40 psi. either way, it seems as if there is a problem with the early ones. hopefully its rectified.

 

Could be an issue with harmonics. The safe speed limits might be more of a resonance issue then structural integrity.

 

if that was the case i dont think it would be possible to give an actual safe shaft speed as harmonics would depend on a lot of things. curious to see how this plays out.

 

I am amazed you guys remain hopeful on this turbo.

First it seems quiet clear the hta3076 produces better power. From Daves testing.

And worse it seems abundantly clear these turbo shafts are not reliable. I wouldnt be surprised if the production version gets stepped back to an inconel wheel.

 

R/T, I didn't know you were going to run the Vipec, whatever you do, when you run across a problem with it and find the solution don't tell him about it! You think I'm hard to deal with, hahahahahahahaha, **** I'm a poster child for the tame compared to him! It's the reason we stopped using/promoting it. I found two problems, both of which I was met with complete arrogance and refusal to admit a problem on. Later a notice came out about the problem I found and solutions...... The Vipec does work well but the personality conflict, wow.

 

You know, now that you mention it for some reason I was remembering logging it in the AEM, now that I think back on it that was back pressure through the AEM. I am fairly certain it could be logged though.