no hp gains with mods

[m4f82kuwait]

my m4 used to be 491.17 whp on map 2 but somehow my car started to lose power.
after a while i installing toyo r888r and did a dyno run .. my car made 470 whp.

I've installed meth kit and my car did 447 whp with intakes downpipes catback jb4 on map 8. ( I've changed my spark plugs )

I've removed all of my mods did a stock run my car made about 400.75 whp

after that i installed intakes and meth only and my car gained only 5 HP ...

what do u think guys?

[coolmody]

Cracked charge pipe causing boost leak? Are you logging?

[m4f82kuwait]

Originally Posted by coolmody

Cracked charge pipe causing boost leak? Are you logging?

my charge pipes are new from bms

[CaryTheLabelGuy]

OP, are you datalogging? How does your timing look? How about boost pressure?

[///M4ster Yoda]

Get a flash tune. Done and Done

[m4f82kuwait]

Originally Posted by CaryTheLabelGuy

OP, are you datalogging? How does your timing look? How about boost pressure?

didn't check

[SflBimmer8484]

Your curve looks way off. Log it and or change maps to verify results.

[mike@x-ph.com]

Originally Posted by ///M4ster Yoda

Get a flash tune. Done and Done

How would that help if OP had a cracked charge pipe?

Originally Posted by m4f82kuwait

didn't check

You need to datalog

[///M4ster Yoda]

Originally Posted by mike@x-ph.com

How would that help if OP had a cracked charge pipe?

You need to datalog

He has new charge pipes. It's the JB4 doing what it does. Which is run fine for some and run like shit for others.

My point was just get a flash and be done with the nonsense.

[mike@x-ph.com]

Originally Posted by ///M4ster Yoda

He has new charge pipes. It's the JB4 doing what it does. Which is run fine for some and run like shit for others.

My point was just get a flash and be done with the nonsense.

We sell a ton of JB4 and the number of issues non-related to bad install is less than 1%

[m4f82kuwait]

i did a map 2 run without meth this was the result mods : intake , intercooler , charge pipes ,jb4 and downpipes
do u think the problem is from the jb4? should i flash tune it ?

[SSIMPS]

Originally Posted by mike@x-ph.com

How would that help if OP had a cracked charge pipe?



You need to datalog

Agreed, something is way off here and flashing it is not going to solve it.

[Mike@N54Tuning.com]

JB4 includes a free logging software which is really useful for answering questions like "why is my car not making as much power as it should be?". Use the logging tool and post to BMS' support forum and they can help you sort it out!

Mike

[BuLoOoSki]

Something is off, probably not tune related. It could be a boost leak if you recently installed chargepipes and a charge cooler, which I wont be surprise if you installed them at the same shop that did your meth kit installation But it could also be a dozen other things and you wont know for sure until you datalog.

[m4f82kuwait]

Originally Posted by BuLoOoSki

Something is off, probably not tune related. It could be a boost leak if you recently installed chargepipes and a charge cooler, which I wont be surprise if you installed them at the same shop that did your meth kit installation But it could also be a dozen other things and you wont know for sure until you datalog.

yes i installed my charge pipes at the same place but heat exchanger at instaperformance

[M3SQRD]

Is the rolling diameter of the R888R different from the diameter of the original tire? What about the wheels - did you put on larger diameter, heavier wheels?

This doesn't explain the total loss of power and shape of the power curve but it's one piece of the puzzle. Good luck sorting out your issue(s)!

[BuLoOoSki]

Originally Posted by M3SQRD

Is the rolling diameter of the R888R different from the diameter of the original tire? What about the wheels - did you put on larger diameter, heavier wheels?

This doesn't explain the total loss of power and shape of the power curve but it's one piece of the puzzle. Good luck sorting out your issue(s)!

I think he runs size 295/30-19 which are 0.6" smaller in diameter than the stock wheel size. But I can't see how that having such effects.

[BuLoOoSki]

Originally Posted by m4f82kuwait

yes i installed my charge pipes at the same place but heat exchanger at instaperformance

Check the chargepipes near the turbo inlet for leaks.

Did he bleed your cooling system after the heat exchanger install? One thing explaining a drop in power is if the car is overheating (due to not bleeding properly). The safety thresholds in these car will pull back on timing if temperatures go up.

Again, it's very simple to find out. Datalog your car making a run on the street and i'm sure someone here or on N54tech will be able to help you identify the issue.

[M3SQRD]

Originally Posted by BuLoOoSki

I think he runs size 295/30-19 which are 0.6" smaller in diameter than the stock wheel size. But I can't see how that having such effects.

I agree but it might explain the initial drop in whp from 491 to 470.

[BuLoOoSki]

Originally Posted by M3SQRD

I agree but it might explain the initial drop in whp from 491 to 470.

Maybe, I guess the affect of a different tire size will affect the gearing so maybe it's the same as the difference of running in 4th vs 5th gear on the dyno.

[M3SQRD]

Originally Posted by BuLoOoSki

Maybe, I guess the affect of a different tire size will affect the gearing so maybe it's the same as the difference of running in 4th vs 5th gear on the dyno.

Heavier tires and wheels can increase the (polar) inertia significantly. It requires more work/energy to drive the higher inertia wheel-tire.

[ross22]

The r888 is a heavier tire than stock. I went from BMW 19 inch wheel/tire combo to Apex 18 inch, 305 R888 and the "smaller" wheel, wider tire combo is actually heavier by almost 9lbs per rear wheel. Another thought is spark plugs, how many miles are on the car now vs. initial dyno. If you're past 7K miles on the same set of plugs, it's a good idea to swap them out, especially if you've been making some spirited runs frequently.