Is there real data showing what rpm each turbo spools at? Stock motor and then comparing stock turbos vs. SRM , VTG 63 & VTG 68's?

 

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Here is a dyno graph of stock, flash, and our VTG turbo package spool on 93 octane all on the same graph. Doesn't get any better than that.

 

When you say VTG package what are you referring to?

 

Its the VTG turbos we use which are custom made to our specs

 

^^^^ something not correct in that graph as stock VTGs on a 997.1 turbo spool and produce good torque from 1950rpm. A bigger wheel seems to move that out to 3000-4000 rpm ish

 

Dyno's should be taken with a grain of salt, every dyno operator will load the cars differently. I can load my dyno so that gt35's spool at 2800rpm or stock turbos dont even hit full boost...

 

+1

OP, it depends how accurate you're looking to be with these comparisons. Mustang dynos, such as the one with the graph above, are load bearing and can read very differently depending on their settings as well as gear used on the dyno. This experiment will be very hard to do accurately unless done in a controlled environment.

Dynojets being inertia based dynos don't vary nearly as much. If you guys will be doing this then my recommendation would be Dynojet boost graphs all done on the same octane, gear and tuning approach.

Even with all that we've seen threads like this explode with people coming in with their expert opinions and doubts and they rarely produce anything valuable at the end of the day. There are a number of other data points when it comes to turbos and spool is just one of them. What about backpressure, efficiency, transient response, reliability, just to name a few.

Dzenno@PTF

 

Variables could easily be removed by using same car same dyno and just switching out turbo's surprised no one has done this to shut down any other claims

 

Well,.. not really. That only happens when you do a 6th gear pull from 50 mph or less,... and the shift-recovery aspect of "spool" isn't in play then.

If you floor it from 2,000 rpm in 4th for instance,... you'll find that the boost really kicks in at about 3,300.

And it's pretty typical to do dyno pulls in 4th,... starting at about 2,000 rpm.

 

I sent my dyno file over to prodigy so he can overlay it with the alpha graphs.