Mojo20032004

Is my car broken or is it just me? Eurocharged s2 tune, catless dp, blackboost intakes. 9.1 60-130 was best I could do. Am I expecting to much from it? I thought it's suppose to be in the mid 8s on 93? I always feel a stumble or a loss of boost around the 100mph range, at times my boost gauge(banks gauge) that's connected to the obd sees 10psi, than eventually will climb back up. Plugs are new, oem plugs gapped down to 0.022,iat around 77-87 during the run.

Baltistyle

Have you replace the check valve in the back of the engine? Are the wastegates fluttering. Ten minutes to check. Plenty of diagnostics in these threads.

bentz69

For comparison

PeterUbers

Curious the logs - wastegate duty, boost, timing, iat

- is your IC pump dead or dying
- wastegate as mentioned above
- log that sucker and see what's cooking
- bad fuel?
- loss of boost - as mentioned / many threads in sticky
- you mentioned plugs are new - how about coils? You don't need a CEL to indicate a bad coil, many threads on this

you'll find it. You should be in high 7, low 8's

my e30/tcu/stock intakes run:

Mojo20032004

Yes checked that check valve, was still good and intact. Also replaced the pipe ontop of the intake manifold that has the 2 check valves, I beleive it's a brake booster line.

Mojo20032004

Coils were replaced at 19,000 miles, car has 38,000 now.
Ic pump works, I verified it turns on with diagnostic tool, also can see the coolant moving/cycling in the intercooler tank.

What is recommended for logging that's not to expensive?

PeterUbers

I change my coils every 10k miles fwiw, have seen a few members convinced they were good and were running slow then got new ones and were running strong again

ultimately you'll need to log this, hptuners and several others discussed in the sticky, see below

threads to consider:

https://mbworld.org/forums/w212-amg/...endations.html

https://mbworld.org/forums/w212-amg/...ph-13-e63.html

https://mbworld.org/forums/w212-amg/...scan-logs.html

PekkaH

@Mojo20032004

Looks like your IC temps were fine on the pull. So can't be IC the pump.

Few things comes to my mind what can be problem:
1. Looks like you have Renntech Bow. Are you sure that thing is not leaking???
2. Not so common but faulty boost solenoid might cause problem.
3. Plugs. If you have OEM plugs no need to gap them anywhere on your tune level. Keep stock gap. I think this can't be the problem, but try stock cap. Could a little better and no hassle to gaping.

And yes with your Mods you should run about 7.5 - 8.1 range on pump gas. Depends on conditions.Weather, DA, slope.

For reference here is my M278 engine CLS500 Shooting Brake with M157 turbos and supporting mods. Pump gas custom dyno tune.

AND perfect conditions on that run.

Mojo20032004

I removed the blow off valve as I was suspecting it was at fault, so currently I am back to the original setup. I just ordered a set of Bosch coils as mine do have close to 20,000 miles on them, I did take it on multiple 3500 miles round trip drives, running it for 10-11hrs straight

PeterUbers

Also heatsoak... were you doing aggressive back to back runs?

PekkaH

Think no. He said "iat around 77-87 during the run. "

PeterUbers

missed that, thanks

Mojo20032004

This was first pass, brisk Sunday morning, 59* air

PeterUbers

boost issue or you're pulling timing

you're on the right track