I beat him pretty easily back when I had the 580 package. That's why I'm now concerned something is wrong...

 

Sent you a PM Matthew. Thanks for the reply.

 

I think from a roll the M6 is quite underestimated. Revving to 20 million rpm and a pretty fast SMG transmission sure doesn't hurt either.

 

Holy crap...they seemed to be pretty evenly matched in those vids!!


PS: I got an email back from EVOMS today...thank goodness. Just when I had lost almost all faith...

 

Good to hear!

 

^^This^^^. At 600 rwhp in my 996, I trapped 136. A car trapping over 135 would literally put bus-lengths on a M6 in a matter of seconds.

 

My real hope is that they put too much fuel in your tune. If you've been doing a lot of full boost pulls with a lean air:fuel ratio then you could really do some damage.

 

Hey Seattlebum,
Just saw this thread and thought I'd share some thoughts. Sorry if some of this was covered by other posts.

As mentioned by a few others in this thread, the tune on your car was designed for an exact combo of parts that when changed (even one item) could throw everything off. That tune file (the timing, fuel and boost maps) were customized after 100s (guessing) of dyno tunes to give the 700-results that are more typical as mentioned by the others who have the full EVO EVT700 kit in the thread.

When the air flow changes even a little bit compared to what the file was programmed for, the AFR might go too lean, meaning the timing or boost could be too high at a specific RPM, resulting in knock and retarded timing or the wrong AFR etc. It just becomes a bigger and bigger problem that could literally rob you of 100 HP even if the turbochargers themselves are correct and the exhaust is free-flowing.

While a custom re-tune by EVOMS might be able to sort some of these, I think this might explain the issue in the first place. Of course I could be wrong and the car might show some code or issue that would be present on a scan, datalog or dyno. But here's how I see a few items effecting things specifically:

Intake: Complete EVT-700 cars always run the stock intake. The intake temperatures and post-intercooler temperatures all relating together are for the EVOMS intercoolers with factory airbox on our installations. More air flow doesn't necessarily mean more power if the car is not tuned for it. It's even worse if the airbox isn't sealed or insulated the same as the stock one, which would throw the temperatures off as well giving an even more skewed result. It becomes a slippery slope that your ECU isn't able to handle and is instead programmed not to handle.

Intercoolers:
Same problem as intake, most of the ones on the market are inferior IMO to the stock or especially the EVOMS units; this is especially the case on the shiny cheaper ones. The biggest worries are flow and temperatures, which as with the intake will cause the issues mentioned above. Also there's the concern about leaking if they're poor quality (not saying they are, just saying another item to consider is many of the non-EVOMS intercoolers I've seen over the years had restrictive endtanks or leaks).

BRV - Are you running the EVOMS units? These are what they intended for the EVT700 cars. These are the authentic, original piece designed for your kit. I worry the aftermarket kits could not respond as quickly or could even be leaking. There is a thread with the non EVO copy BRVs causing issues and not functioning properly for people that you can see here:
https://www.6speedonline.com/forums/...brvs-ap-2.html

Headers - different / more restrictive or differently designed headers would mean the turbos are spooling at a different time than intended. This would result in more lag, exhaust restriction / back pressure and the powerband being shifted to a different RPM (where your ECU was not tuned for, ie full boost at 4000 instead of 3500 means too much fuel at 3500 and not enough at 4000 etc.).

After these concerns the next issues I'd look into are boost leaks, error codes, datalogs, AFR (dyno testing with an EVOMS dealer on an AWD mechanically linked Mustang dyno) etc. You said the plugs were replaced, if they were not done correctly or the wrong plugs were used you'd probably see error codes so I doubt this is the problem but I'd check it after everything else mentioned here. I'd even check the cats to be sure they're working properly and the honeycombs are fully intact.

The EVT-700 is really a lot more than the turbochargers and software. The tune was designed for a specific sum of parts, which it seems like you don't have. Mix-matching parts is going to lead to different results however you could have it custom-tuned by EVO to get the best out of what you have (it just wouldn't be an EVT-700 kit).

Good luck and hope this helps, I hope you get this fixed to put the smack down on those BMWs.

 

Thanks for the post Dan! Very informative. Car is in good hands right now. We will see what happens. BTW, the brvs are the Evoms units.

 

Do you have 100 octane map on your evt700? Sometimes the tunes can be off if there are miss matched parts. A proper dyno tune will fix that right up. and the reason I ask about 100 octane is because they originally tune it for 100 octane and and their 93 tunes are not as aggressive so they have on the go file changes . Runs WAY better on 100.

 

Nope, just 92 octane map. When I upgraded the tune I disclosed the entire parts list first. I was told it wouldn't effect the results much. Maybe a few hp/tq here and there.

Dropped the car off today. Will hopefully have an answer sometime next week. My gut tells me the bolt-ons are all installed properly. My guess is the tune just needs a custom touch. Not my first car that's undergone upgrade woes. I understand completely how these things go. In the end, I'll be sportin' that huge grin from ear to ear!

I'll keep ya'll posted on what they find.

 

Sounds like it could be a simple ecu or mechanical fix, maf's get dirty etc. Best of luck op.

 

Car dyno'd about 450whp/500wtq. Shop has some leads on the potential issues. I'm hoping to be feeling 600+whp some day soon! I imagine that it's kinda like finding a $100 bill in your pants pocket that didn't know was there.

 

Any update?

 

Car is still in the shop awaiting some different parts to make this car a true EVT700 (all parts being sourced from Evoms). Turns out I've been missing the turbo inlet tubes this whole time and also have the smaller 63.5mm diameter Fabspeed exhaust that comes with the EVT580 kit. The EVT650+ have a 70mm exhaust. I'll probably still stay with the exhaust for now so I still won't quite have the full EVT700 kit. Evoms has been very helpful in getting this car on the road again. BTW, for anyone in the Pacific NW needing some expert help on their car you need to give your car to Alex at MaxRPM Motorsports. He is the man!