[D-MAN]

I need some help!

My car is an 05 JCW MCS with the following mods
16% S/C pulley
2% crank pulley
GTT header
GTT JCW CAI upgrade
Thumper head

I had a new high performance head installed at one shop 4 weeks ago and have been taking it easy to run it in.
Last week I dropped the car off to another shop for a custom Dimsport tune.

When I came back 2 days later this is what I found.

Pre tune (with new head) 109kw = 147whp

After tune 133kW = 178whp

The car is making less power than it was before the head install and tune! It fells slower!
The car is not throwing codes so I assume it must be a boost leak.
What would be the most likely source?
Intercooler seals, By pass valve?
Anything else?

I assume that the shop that did the head install have done something wrong as the job was sloppy.

Both shops are blaming the other for the power loss!!!

Any advice would be appreciated!

Thanks
D-MAN

[sef]

Slipping SC belt is something else to add to the list for checking...

[Lucky Dave]

Check the vac hose to your old JCW airbox is blocked up since the airbox was removed or better still the Y piece removed where it fits to the bypass valve.

Also I have found HT leads to fail under load after they have been removed.

[MINI-Morgan]

Anyone that can plug in to monitor the boost pressure or has a boost gauge you can borrow? Do you hear a hiss when accelerating hard?? Does the power come on and fell like it drops off the harder you accelerate?

[GTT 280]

WOW - What's a THUMPER Head?

Pre tune (with new head) 109kw = 147whp
After tune 133kW = 178whp

What was the tune? - RR and ECU?

Cheers,
K.

[Paul Webster]

You'll find Thumper on NAM, he's a master of modifying Mustangs small block Fords as well.

Thumper of Orange Park

[D-MAN]

[quote=GTT 280;3416887]WOW - What's a THUMPER Head?

Pre tune (with new head) 109kw = 147whp
After tune 133kW = 178whp
quote]
First of all thanks to the guys who have given me some advice I appreciate it. Hopefully I can get the problem fixed, I have dropped the car back to the shop and they are going to check the boost.

Now as for GTT280 - I really hope that you are not been sarcastic.
It is obvious that I have a problem with the car and if you have nothing constructive to add to the thread and are only putting the boot in why be bothered? Does it make you feel better?

It says a lot about the type of person that you are if you take enjoyment out of others misfortune. If this is the case you obviously are a first rate ****** or have an inferiority complex. Maybe even both.

As for having a sly go at the Thumper head from Thumper Performance of Orange Park you are way off. Mike who does all the work is a top bloke and has been in contact with me everyday about the problem, it could have been easy for him to walk away as he is in the States and I am in Australia but he did not. He has given me heaps of advice and he is more keen than me to find out why the power loss! This speaks volumes about the type of guy he is and why I did and have no problems doing business with him.
The head is not the problem and the quality of his work speaks for itself.

So Karl if you have anything constructive to add to this thread please do but otherwise don't waste my time.

[Silent1]

Quote: Originally Posted by D-MAN (original)

Quote: Originally Posted by GTT 280 (original)

WOW - What's a THUMPER Head?

Pre tune (with new head) 109kw = 147whp
After tune 133kW = 178whp

First of all thanks to the guys who have given me some advice I appreciate it. Hopefully I can get the problem fixed, I have dropped the car back to the shop and they are going to check the boost.

Now as for GTT280 - I really hope that you are not been sarcastic.
It is obvious that I have a problem with the car and if you have nothing constructive to add to the thread and are only putting the boot in why be bothered? Does it make you feel better?

It says a lot about the type of person that you are if you take enjoyment out of others misfortune. If this is the case you obviously are a first rate ****** or have an inferiority complex. Maybe even both.

As for having a sly go at the Thumper head from Thumper Performance of Orange Park you are way off. Mike who does all the work is a top bloke and has been in contact with me everyday about the problem, it could have been easy for him to walk away as he is in the States and I am in Australia but he did not. He has given me heaps of advice and he is more keen than me to find out why the power loss! This speaks volumes about the type of guy he is and why I did and have no problems doing business with him.
The head is not the problem and the quality of his work speaks for itself.

So Karl if you have anything constructive to add to this thread please do but otherwise don't waste my time.

Ha, oh wow, D-man you are a man of many talents,
from this:

Quote: Originally Posted by GTT 280 (original)

WOW - What's a THUMPER Head?

Pre tune (with new head) 109kw = 147whp
After tune 133kW = 178whp

What was the tune? - RR and ECU?

Cheers,
K.

You've somehow inferred that Karl is insulting the company that made it and "It says a lot about the type of person that you are if you take enjoyment out of others misfortune. If this is the case you obviously are a first rate ****** or have an inferiority complex. Maybe even both."

Perhaps he was just asking what ECU you had and what rolling road you used so he might be able to add something constructive to the discussion.

================================================== ==========

Apart from that, what power was the car making before the new head was installed? Was it done on the same dyno in the same conditions?

[D-MAN]

If that is the case I appologise as it was totally out of order. But I still think he was taking the ****...

But it has been a long day and the whole thing is frustrating as I am not getting any answers from the shop that did the install or tune!

The car before the head/headers install was making around 135kW but this was on a different dyno and at a different shop.

As for the tune it was a Dimsport ECU tune.

[GTT 280]

relax man. paranoia is a terrible thing

I just wondered what tune produced 31bhp - but you seems to be an angry guy, so i will leave you to it.

And as for being a newbie - terrible manners mate

Cheers,
K.

[BigShow]

I sugest you find somewhere that can do a leak down test/compression check to ensure the head is sealed properly as this will lose you power. If its not sealed properly you know who to go back to.

If you're not sure what a leak down test is have a read here:

Leak Down Test VFAQ

Otherwise it sounds like a boost issue so check the snoot boots on the I/C are sealed properly and as others said listen out for hissing under WOT.

Hope you get it sorted.

[Paul Webster]

What was the figure when they first dyno'd the car this the stock map, this might give us a clue.

If you can show us the result this might help us to figure it out.

What was the IAT and Boost when dynoing?

Did the shop that fitted the head give you your old head back?

Did they check the cam timing?

Did you fit ARP head studs or new head bolts?

[D-MAN]

Quote: Originally Posted by GTT 280 (original)

relax man. paranoia is a terrible thing

I just wondered what tune produced 31bhp - but you seems to be an angry guy, so i will leave you to it.

And as for being a newbie - terrible manners mate

Cheers,
K.

Sorry if I came across angry... just a really bad day...

Cheers
Damien

[D-MAN]

What was the figure when they first dyno'd the car this the stock map, this might give us a clue.
135kW with no head/headers standard map
109kW with all mods standard map
132kW with all mods + Dimsport custom tune

What was the IAT and Boost when dynoing? Still waiting on the shop to e-mail me the info

Did the shop that fitted the head give you your old head back? = Yes, still have my JCW head

Did they check the cam timing? Apparantly they did - that was my first qestion!

Did you fit ARP head studs or new head bolts? ARP studs

[D-MAN]

Quote: Originally Posted by BigShow300 (original)

I sugest you find somewhere that can do a leak down test/compression check to ensure the head is sealed properly as this will lose you power. If its not sealed properly you know who to go back to.

If you're not sure what a leak down test is have a read here:

Leak Down Test VFAQ

Otherwise it sounds like a boost issue so check the snoot boots on the I/C are sealed properly and as others said listen out for hissing under WOT.

Hope you get it sorted.

Thanks Big show
The compression test came back normal so shouldn't be a "Head" problem!

[D-MAN]

Just spoke to the shop and the bypass valve is leaking boost big time.
The car was only putting out 8psi of boost
So no wonder the power loss!!!!
They are going to replace the by-pass valve and hopefully that will be it.

[Paul Webster]

Its always the $1 part, in this case the $90 aus part

So they've tuned it with 8psi of boost, obviously they'll be retuning it for you

At least you know what'll make if you go +5% SC pulley

Cant wait to hear the final result

[batou]

Quote: Originally Posted by D-MAN (original)

Just spoke to the shop and the bypass valve is leaking boost big time.
The car was only putting out 8psi of boost
So no wonder the power loss!!!!
They are going to replace the by-pass valve and hopefully that will be it.

Another one!! Make sure you get the latest revision from bmw as it has a better spring in it.

RealOEM.COM * BMW R53 Cooper S CHARGE-AIR COOLING

Part # 11617568423

I paid £36 GBP +vat for it.

[D-MAN]

Quote: Originally Posted by batou (original)

Another one!! Make sure you get the latest revision from bmw as it has a better spring in it.

RealOEM.COM * BMW R53 Cooper S CHARGE-AIR COOLING

Part # 11617568423

I paid £36 GBP +vat for it.

Will do! Thanks!

[D-MAN]

Im suprised and annoyed that the shop that did the tune didn't pick it up!
I thought they would have measured the boost during the tune?

Finally how important is having a good fan set up for the cooling?
I noticed the fan at the shop was a bit of a joke - it looked like my wifes hairdryer would do a better job.
What is the ideal IAT?

Thanks