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Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI Power Enhancements

TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old September 20th, 2006, 10:57   #1
San Fran Crisco
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Default Power increase report: 11mm pump into 5-speed A4

Just want to let everyone know that doesn't already -

Installing an 11mm pump (from the automatic TDI) into my 5-spd A4 resulted in a significant power increase. I notice a lot more pull from 2000 RPM on up to above 4000. It might also have caused a small decrease in power below 2000, but I cannot know for certain. This could merely be an illusion created by the significant increase felt above 2k. At the same time I also replaced the stock air filter with a new K&N unit.

I also notice a bit more smoke, especially when the engine is cold - of the black color. I suspect that is normal when you increase the amount of fuel being injected.

Given that I have made this change, can anyone recommend a timing adjustment or should it remain stock for best results?

Thanks!
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Old September 20th, 2006, 10:59   #2
Slave2school
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File 13 the K&N and save the MAF
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Old September 20th, 2006, 11:03   #3
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I am not sure about the claims of K&N fouling the MAF. This might be the case if you over oil it. Other then that i have been running one for 45,000km and not had a problem. I also realize that it may not have much of an impact on performance but never purchasing another air fiter is a major bonus.
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Old September 20th, 2006, 11:19   #4
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A fuel cooler will help reduce the smoke cause by larger pump. Thats why the automatic tranny cars come with a cooler.
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Old September 20th, 2006, 11:33   #5
San Fran Crisco
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Quote:
Originally Posted by KROUT
A fuel cooler will help reduce the smoke cause by larger pump. Thats why the automatic tranny cars come with a cooler.
I don't understand why cooler fuel would reduce smoke. At startup, my fuel is the coldest, and the smoke is the most significant. I thought that there was a different reason for the Automatics to have their fuel coolers.
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Old September 20th, 2006, 12:47   #6
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The fuel cooler primarily prevents excessive heating of the fuel.
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Old September 20th, 2006, 13:01   #7
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The cooler wont do anything for cold starts but it will help when running WOT.
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Old September 20th, 2006, 14:51   #8
San Fran Crisco
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Quote:
Originally Posted by TDIMeister
The fuel cooler primarily prevents excessive heating of the fuel.
Don't take this personally, but I think that part is obvious.

I can guess that cool fuel will assist with dropping the temp of the intake charge, but since it happens after the intake valve closes (unlike a gasoline engine), there will be no increase in the number of air molecules available - so I fail to see the benefit of the cooler fuel.

My greasecar system does not send the fuel back to the tank, but loops it back thru the filter - this results in very high fuel temps if you drive long enough. Pretty much the same as you would get if you run the regular tank very low on a hot day.

Can someone tell me what the result is of running fuel temps over 200 degrees F?

I have not noticed any difference so far.....
THANKS!
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Old September 20th, 2006, 15:55   #9
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Quote:
Originally Posted by KROUT
A fuel cooler will help reduce the smoke cause by larger pump. Thats why the automatic tranny cars come with a cooler.
so is it possible to install the fuel cooler from an auto tranny into a 5spd?
PD?
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Old September 20th, 2006, 17:59   #10
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Crisco]Just want to let everyone know that doesn't already -

Installing an 11mm pump (from the automatic TDI) into my 5-spd A4 resulted in a significant power increase. I notice a lot more pull from 2000 RPM on up to above 4000. It might also have caused a small decrease in power below 2000, but I cannot know for certain. This could merely be an illusion created by the significant increase felt above 2k. At the same time I also replaced the stock air filter with a new K&N unit.

I also notice a bit more smoke, especially when the engine is cold - of the black color. I suspect that is normal when you increase the amount of fuel being injected.

Given that I have made this change, can anyone recommend a timing adjustment or should it remain stock for best results?

Thanks![/quote]
Not sure I can recommend a particular timing adjustment but like you I saw an increase in power going from a 10mm to an 11mm head and then even further gains going with an 11mm pump vs just the 11mm head.

Here's my dyno plot using the 11mm pump


Here's the next plot using a new 11mm head in a 10mm pump



As you can see there's an improvment just doing this. I can't remember exactly but with the 10mm pump it was less although back then I didn't have a larger turbo, injectors or chip upgrade.

Enjoy your ride!
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Old September 20th, 2006, 19:14   #11
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Thanks Sootman... now I'm stoked



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Old September 20th, 2006, 19:37   #12
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Quote:
Originally Posted by FlyTDI Guy
Thanks Sootman... now I'm stoked



Well somebody got some nice toys. Nothing like an engine make over.
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Old September 20th, 2006, 22:14   #13
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Quote:
Originally Posted by KROUT
Well somebody got some nice toys. Nothing like an engine make over.
Yep - Fly's been spending quite the $$$... Man, pumps, turbos and coolers look sweet on concrete - wonder how they'd look installed ?

Hope I can assist Fly.
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Old September 21st, 2006, 12:23   #14
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FlyTDI is gonna be flyin' for sure with those new goodies. Have fun and crank up ther radar/lazer detector, you'll be needing it.
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Old September 21st, 2006, 13:31   #15
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"By changing to the 11 mm pump is about the same boost as going to the next size nozzle" from Jeff at Rocketchip. That is why the standard shift .184 nozzles are great for a automatic TDI. Automatics also have a fuel cooler as noted above
Most people that change the pump have gone all out with other mods and still want more, from what I have read.
As far as the smoke goes, I think a tweek of your IQ should take care of it (the same thing happens with larger nozzles)
Your mod is interesting to me because it isn't done first. Aside from the power boost I wonder if it will give better MPG after you get rid of the smoke?

Good luck and keep us posted..............Gil
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