evanbatterman
Active member
I recently bought some chips for my b 4 passat tdi, and someone told me to do the hammer mod, but I cant find any thread. could someone explain what it does and how it works?
what does the hammer mod do?
- Thread starter evanbatterman
- Start date
http://forums.tdiclub.com/showthread.php?t=45870
it adjusts injection quantity when it is too far off for the computer to do it itself. if you have vagcom, hook up and look at the measuring block. 4-5 mg/stroke is the normal i think. if its within that theres no need to mess with it.
it adjusts injection quantity when it is too far off for the computer to do it itself. if you have vagcom, hook up and look at the measuring block. 4-5 mg/stroke is the normal i think. if its within that theres no need to mess with it.
Overfuelin5spd
troll, banned
How come no one wants to give their 2cents as to what the hammer mod is??
Overfuelin5spd
troll, banned
Does Robert Bosch know about people hitting his pump with a hammer??
Overfuelin5spd
troll, banned
I read the Ve pump manual from Bosch, no where in it does it state
" If the computer cannot automatically make the adjustments on its own you must hit it with a CLAW hammer."
" If the computer cannot automatically make the adjustments on its own you must hit it with a CLAW hammer."
Bob_Fout
Oil Wanker
Why would the pump manual take into account those running larger than factory nozzles in certain specific situations?Overfuelin5spd said:
(there are a lot of things that aren't in any manual)
Got Bearings?
Veteran Member
Corporal, would you turn to the page in this book that says where the enlisted men's mess hall is?Overfuelin5spd said:
Lt. Kaffee, that's not in the book, sir.
I don't understand, how did you know where the enlisted men's mess hall was if it's not in this book?
I guess I just followed the crowd at chow time, sir.
No more questions.
How pronounced is the effect of this modification (if larger diameter injectors are the only variable)? Also, if the pump is adjusted too much in either direction, would the integrity of the pump be compromised? How would one go about measuring the distance(either left or right) that it needed to be tapped?
Farfromovin
Torque Addict
The effect is very pronounced. Get it too low (like below 1), and the pump can outrun itself (or so I've heard). It usually is used to adjust the IQ where you want it so smoke and drivability are both manageable. You can only change the IQ so much with adaptation in VCDS, this helps go further should you need to based on your current, and non stock, hardware. You measure the distance by watching the IQ change in VCDS preferably on a laptop perched up in the engine bay as you gently tap with a soft mallet, or even prop a piece of wood on the pump head. It's very easy, you just need the special triangle bit to loosen that one bolt.FlashT said:
Precisely my thoughts.Got Bearings? said:
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evanbatterman
Active member
wow i left this thread for two weaks, and It has truly flourished, at first I forgot about it and came back by accident and now I am very interested in performing the hammer mod. thanks guys
evanbatterman
Active member
which way do you wack the pump for the desired effects?
mech644
Veteran Member
Depends on what the effect desired is. Its been discussed ad nauseum in untold # of threads. Search and ye shall find.
tdeboeser
Well-known member
I've been researching IP info lately.
Heres a good post:
http://forums.tdiclub.com/showpost.php?p=2781142&postcount=35
also, reading the that thread would be helpful.
http://forums.tdiclub.com/showthread.php?t=229965&page=3
Tom de
Heres a good post:
http://forums.tdiclub.com/showpost.php?p=2781142&postcount=35
also, reading the that thread would be helpful.
http://forums.tdiclub.com/showthread.php?t=229965&page=3
Tom de
steffen707
Veteran Member
LMAO, I can't remember what movie that's from.
And while I know there are a hundred hammer mod threads, I brought this one back from the dead cuz I liked the quote, and while its back on top of the list I figured i would ask my hammer mod question here, than a possible more relevant thread.
But I was wondering, how many times does a person do the hammer mod, that they end up screwing up the seal inside the pump, and have to replace it. I've read some threads like http://forums.tdiclub.com/showthread.php?t=229965&page=3 and http://forums.tdiclub.com/showthread.php?p=2781142#post2781142
and I know that vag-com can adjust the IQ some, but for bigger adjustments you have to do the hammer mod. I havn't got mine checked with vag-com yet, but want to know the risks involved if does need to be adjusted.
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chops85
New member
One of the previous owners cut a slit in the triangle bolt so it can be loosened with a flat head screwdriver. I'll post a pic as soon as I find my camera.
steffen707
Veteran Member
Any news on how many guys do the hammer mod and then get a leaky pump from screwing up the seal?
IndigoBlueWagon
TDIClub Enthusiast, Principal IDParts, Vendor , w/
I've hammered and un-hammered a number of pumps, never a leak.
robnitro
Veteran Member
I never had to loosen the triangle bolt, just the 3 torx. A block of wood used and a small hammer tapping while the engine idling w vag com, I was able to see small changes which lead to the IQ I wanted. Only time I had a leak was when I loosened the 3 bolts too much while idling. Quickly put a bit of torque on them and leaks stopped. No leaks besides that time.