Tweaking my 2.8 TGV engine (ex Td5), How much is "safe"? - Defender Source
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  #1  
Old January 29th, 2010, 02:44 PM
Santiago
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Tweaking my 2.8 TGV engine (ex Td5), How much is "safe"?

Hi,

I have a 2.8 TGV Defender 110 that used to be a Td5, year 2000.

Changes I have made to it:

a) I have changed the high ratio of the transfer box to 1:22 to 1
b) use 265/75/16 tires
c) fitted a standard size but uprated Brunel IC
d) taken out the mid box silencer and replaced with straight through pipe (rear small silencer still inplace)

Now, I want to tweak the engine a bit to recover a little bit of the acceleration/reaction I lost when going to 1:22 to 1.

I have read a lot on this forum and others about tweaking 300Tdi pumps and I have already screwed (CW) the smoke screw 1 3/4 turns, which has made a very nice improvement in acceleration/reactio at low rpm's.

I am considering trying "the famous" 90 degrees CW trun of the diaphragm (it is reported to significantly increase BHP) but I am afraid about its consequences on: clutch, gear box and engine EGT (I do not have EGT gauge!!!!).

Could the people who have some experience doing some kind of tuning to the 2.8 engine tell me if I am playing with fire or not?

I am only planning to do the 90 degree rotation (clockwise) of the diaphragm plus the some screw which I have already tweaked. Nothing else.

I guess my uprated IC and removal of the silencer should help keep the EGT's down but what about gear box an clutch.

Has anybody done this before?

All comments and help wil be appreciated.

Thanks!
Cheers,

SG
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  #2  
Old January 29th, 2010, 03:55 PM
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David Marchand
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I would do nothing more without an EGT gauge. Seriously. I know you know, but you need that first and you need experience driving it, watching it to see where you are peaking the temps at.

I have tweaked mine quite a bit and have the 90 degree diaphragm turn. It helps but I'm also running the 2.8 on an auto which saps power on its own. So I imagine with an R380, you'll see greater results.
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Old January 29th, 2010, 04:19 PM
Santiago
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OK, I will take your advice David.

Do you often approach dangerous EGT temperatures or it is not that common?

Do you know the max recommended exhaust temperature?

What about gear box and clutch?
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  #4  
Old January 29th, 2010, 09:26 PM
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Best bang for thebuck gauges here. http://stores.shop.ebay.com/Auber-In...34Q2ec0Q2em322

700 C peak is a good number.

90 degrees on the diaphram usually puts it to the maximum point. It is important to mark the diaphram location as found and the pullit to see where the max and min points are located.

Also get a boost gauge and see where you are running.
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Old January 30th, 2010, 05:59 PM
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Post

John,
any specific model you would recommend?
Just to narrow the choice, as there are many on the list and I got lost.
These are the cheapest gauges I found so far and I would order one soon.
I have an old thread with a post of yours somewhere in my favs, just can't find it at the mo...

Any suggestion is welcome
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Old January 30th, 2010, 06:46 PM
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This is fine. Gauge with 1/4"-20 thermocouple. $60 plus shipping. An amazing deal for a digital gauge with max memory, alarm output and the thermocouple.
http://cgi.ebay.com/Automobile-Multi...item19b97f5b60
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Old January 31st, 2010, 04:11 AM
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Thanks,
can't beat that price!
Last I've been quoted (digital, made in Germany bla bla bla) is around 220€...
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Old February 1st, 2010, 07:55 AM
Santiago
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Nobody else have done tuning on a 2.8 TGV with an R380 gearbox so that I can learn from their experience?

Is it true that having a 1:22 to 1 high ratio relation will imply that the gearbox will "suffer" more strain than if I had the original 1:44 to 1 ratio?

I will appreciate somebody's help on this.

Thanks
Stgo
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  #9  
Old February 1st, 2010, 03:24 PM
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Any Idea where to get the 2.8 manifold sticker? I need one
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Old February 1st, 2010, 08:57 PM
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We have done quite a bit of tuning on this engine. In last year's Dakar in your country we had a Bowler with a 2.8 tgv in combination with R380 and heavy duty clutch from Land Rover. We had the engine at 440 NM and appr 160 hp. Unfortunately the clutch is/was not strong enough.
In a Defender 110 I had my engine tuned also, the new gearbox lasted about 50.000 km. The engine it self is strong enough to be tuned, never had any problem with the engine as long as EGT is ok. You will get problems with the rest of the car though.
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Old February 2nd, 2010, 08:05 PM
Santiago
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Thanks for sharing your experience Johan.
MMmmmm...sounds like I better not do anything more to my 2.8TGV.
Was your tuned Defender a 2.8 TGV and R380 latest spec gearbox?
I guess it will also depend on the driving style?
Cheers,
Stgo
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Old February 3rd, 2010, 12:15 PM
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The gearboxes I wrecked were not the latest spec. They say the latest are the strongest. We used this in the Dakar rally and didn't have any gearbox problems. Ofcourse we were not interested in a long lasting gearbox it only had to make it the 6000 miles of the rally.
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