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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 November 7th, 2008, 06:10   #31
Rub87
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more than 1.3 bar is useless, at 1.3 bar at 2500rpm the clutch slips without the slightest haze..

And then first log you IAT in channel 7 before thinking about a 2nd intercooler, it's definatly not the way to go.. if you DO see high IAT's it means that you're running the compressor way out of it's effciency range.. the PD100 uses the same intercooler and flows 170hp without problem

Imo such engine need a gt1749v or kp39, just cut the 4th runner, it will spool sooner and flow enough top you can also do ASZ/ARL nozzles
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Old November 7th, 2008, 07:19   #32
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I run 1.35 bar with no clutch slip?

Also why bother with bigger injectors, the car can't burn the fuel the current injectors can chuck in right now?

I have heard that 142 bhp is possible from the 1.4 PD TDI. All this with the standard air box too!

To do this you need:

# PD130 injectors,
# hybrid gt12 vnt turbine with a 17/44 compressor housing,
# ported head,
# pd150 conrods and pistons(lower compression ratio) bear in mind if you do this that the number 1 piston is slightlly different shape to the rest so therefore can only go into the number 1 bore)
# custom remap

I know its alot of expense as 110-115bhp is possible anyway with just a remap, so you talking $$$$ for 30bhp!

Has anyone here gone this route or know anyone that has? Apparently is is too much and causes crank whip?
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Old November 7th, 2008, 08:06   #33
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Nice to see this topic on top

The clutch of my 1.4TDi slipped this morning (it's the first time this happens).
Rub87 chipped my car. Very happy about that.
He had to reduce the torque in the low revs to avoid clutch slip.

I guess the colder weather has something to do with it.

Ruben, what clutch would you recommend ?
Is there anything from the VW catalogue , plug-n-play?
Can I use the clutch from a 1.9l 130 polo ?
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Old November 7th, 2008, 08:29   #34
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No, you cant use the PD130 clutch, its a 6speed gearbox in this car with 240mm diameter!
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Old November 7th, 2008, 09:16   #35
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I run with 1,3bar in my 1,4TDI, and so far it seem to work good, I've been told that its about max what the turbo likes.
Clutch seem to hold and the engine is realy strong over 2000rpm, I realy like this engine.

80-120km/h takes 7,5 seconds with my Polo, thats great I think.

/Theo
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Old November 7th, 2008, 16:20   #36
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a few days ago i had a chat with david from spec-clutch and he can provide
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Old November 8th, 2008, 06:31   #37
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TheoSweden:

"80-120km/h takes 7,5 seconds with my Polo, thats great I think."

What gear? 5th I presume?

Also has anyne upped the rev limit? I think 4750rpm is the limit as beyond this there are no calculations stored in the ECU to modify?

Thanks
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Old November 8th, 2008, 07:58   #38
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Quote:
Originally Posted by pietch
TheoSweden:

"80-120km/h takes 7,5 seconds with my Polo, thats great I think."

What gear? 5th I presume?

Also has anyne upped the rev limit? I think 4750rpm is the limit as beyond this there are no calculations stored in the ECU to modify?

Thanks
No thats 4th gear/as fast as it can. Havnt tryed 5th gear, but its not slow there either.

I have "upped" the rev limit on my Audi to around 5000-5100rpm. If you wants to run fast on a circuit for example, there are HUGE advatages doing that! (If you have hardware that likes that ofcourse)

/Theo
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Last edited by TheoSweden; November 8th, 2008 at 15:57.
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Old November 8th, 2008, 12:26   #39
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Problem with the 1.4 tdi is that the turbo is just soo damn small there isn't much use to bring rpm's up because peak turbo effciency is between 2000-3200rpm, above 3500 you can feel it choking..

Jaco's car is also running 1.3 bar in midrange and tapers off after 3200rpm, it is completely smokefree, if you don't mind some smoke you can see some extra hp in top end..

@ pietch I mean the ARL injectors if you run a vnt from a 1.9.. If you take the 90hp version from the audi A2 it already has the lower CR and PD150 style bottomend

Jaco I don't know if there are any better clutches pnp.. I would assume the the flywheel clutch assembly wa salso from a PD100, but it seems not.. and yes, when it's colder clutch can slip due the lower IAT you have slightly more torque..
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Old November 9th, 2008, 04:10   #40
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I do not think the turbo is too small... infact I think it is just right but could do with a ball bearing or VNT setup for a faster spool.

My car holds just over 100bhp at the rev-limit @ 4750rpm which is fine and does not seem to choke at all after 3200rpm.

Due to the torque dropping fast after 2500rpm I do not fee that more bhp would really equate to that much more speed... I think a higher RPM limit and a much faster turbo spool would benifit performance best as 90% of normal driving occurs between 1200rpm and 2400rpm!

So improving power between 1000rpm and 2000rpm where the turbo is only producing low boost would transform the car. I have found that overfuling here is fixes this but makes way too much smoke for road use, especially at night! I am not sure what other methods could be used here to help? Is there a air flow meter trick that could help here?

Anyone?

Also if rebuilding a turbocharger (what is current turbocharger setup by the way?) what would be the ideal way to keep top end as it is but to increase turbo spool at low rpm?
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Last edited by pietch; November 9th, 2008 at 04:19.
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Old November 9th, 2008, 04:44   #41
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It seems to me like you want maximum power put of your engine? Then just install PD130/150 injectors, and a bigger VNT (like VNT20 maybe) and ECU program from a Audi A2, and get it good remapped.
As Rub says, this turbo is just so damn small, As I see it its nothing to use if tuning for real.

//Theo

Quote:
Originally Posted by pietch
I do not think the turbo is too small... infact I think it is just right but could do with a ball bearing or VNT setup for a faster spool.

My car holds just over 100bhp at the rev-limit @ 4750rpm which is fine and does not seem to choke at all after 3200rpm.

Due to the torque dropping fast after 2500rpm I do not fee that more bhp would really equate to that much more speed... I think a higher RPM limit and a much faster turbo spool would benifit performance best as 90% of normal driving occurs between 1200rpm and 2400rpm!

So improving power between 1000rpm and 2000rpm where the turbo is only producing low boost would transform the car. I have found that overfuling here is fixes this but makes way too much smoke for road use, especially at night! I am not sure what other methods could be used here to help? Is there a air flow meter trick that could help here?

Anyone?

Also if rebuilding a turbocharger (what is current turbocharger setup by the way?) what would be the ideal way to keep top end as it is but to increase turbo spool at low rpm?
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Old November 9th, 2008, 08:42   #42
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Why do you think the torque drops soon after 3000rpm pietch

Just use a kp39, I think it will still spool better than the oem gt12 and flow alot more top..

You don't need much torque below 2000 in fact, the onesI mapped go quite well from 1700-1800, but the gears are short enough so it really isn't disturbing that it doesn't pull hard from so low, also it will kill the DMF quite soon if you have much torque down low..
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Dyno'd area, Old VNT20 setup dyno'd 192whp
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Old November 9th, 2008, 10:34   #43
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The 1.4 tdi *engine code AMF does not have a dual mass flywheel (dmf).

If I chronically over fuel below 2000rpm the car feels great (apart from the soot)... few gear changes and more power in real life driving situations.

I do not need more then 117bhp... I want more bhp down low and an improved torque curve.

I know that the mentioned 1.4TDI with 142 bhp suffered gearbox problems and crank whip which led to engine failure. Basically the gearbox and crank can't take much more power.

I just want to improve my spread of bhp and torque

How can I reduce my soot? What modifications would allow me to fuel more bearing in ming that the 142bhp car flowed this power with the stock exhaust and air filter.

Ideas?

FYO here are some tests I did:

1.4 TDI 50-70mph times in various states of tune:

Folows this post: http://www.briskoda.net/forums/fabia...ds-once/95789/

Some info people might find intresting:

Standard 1.4 TDI:
50-70 in 4th > 7.3 sec
50-70 in 5th > 9.3 sec

Digital Tuning Box Only:
50-70 in 4th > 5.4 sec
50-70 in 5th > 7.4 sec

117bhp Remap Only:
50-70 in 4th > 4.7 sec
50-70 in 5th > 7.6 sec

117bhp Remap + Digital Tuning Box: * Lots of soot!!
50-70 in 4th > 4.4 sec
50-70 in 5th > 6.0 sec

For reference a remapped 1.9 TDI PD 100 does:
50-70 in 4th > 4.2 sec
50-70 in 5th > 6.5 sec

Other std cars in 4th:
997 turbo does it in 2.2 (!!!!)
v8 vantage 4.1
astra vxr 4.0sec,
Golf GTi’s 4.4sec
Clio 182 5.6sec

Basically the problem with the 1.4tdi is a limit with the max tunable parameters on the ECU... the tuning box bypass these and apart from the soot the results are a totally transformed car!
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Last edited by pietch; November 9th, 2008 at 10:46.
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Old November 9th, 2008, 11:51   #44
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If you want to spread the power just use the turbo from a 90hp version, it will flow 120hp easy and spool sooner .
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Dyno'd area, Old VNT20 setup dyno'd 192whp
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Old November 9th, 2008, 12:54   #45
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The 90hp version has a VNT turbo... 75bhp has a GT1544 - I don't think it is an easy/ direct swap??
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Last edited by pietch; November 9th, 2008 at 14:14.
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