Technical JTD105 Performance testing 0-60 0-100

[JTDLee]

Hi guys, some surprising results:

Tested my marea JTD105 weekend 3 times to 60 and to 100 against a stop watch, with speedo GPS tested to 1mph +/- accuracy. Running with Abrieb tuning chip, 0-60 best time 8.79 secs, best 0-100 24.4 secs.

This on a 50% vegetable oil mix to 50% diesel. For a 1200kg car, this means it must be putting out at least 130bhp and 200lb/ft, and I must admit to being very impressed indeed, making it as swift as a new bravo multijet 150, and a fair bit quicker than a Mondeo 2.0tdci. It's almost identical to a Mk2 golf gti 8v, a peformance benchmark of old.

Why not tweak yours? the feeling of gaining so much extra go in literally 5 mins of fitting for £65 is wonderful to the newly converted diesel motorist (me).

:slayer:

 

[pleinichen]

Why not tweak yours? the feeling of gaining so much extra go in literally 5 mins of fitting for £65 is wonderful to the newly converted diesel motorist (me).

:slayer:

Hi,

Sounds like a very promising option - i've looked at a few versions of plug-in tuning boxes but they all seem to be a lot more than £65. Which method / option have you used?

I'm newly converted to Diesel myself and (apart from a brief spell of stupidity owning a Daihatsu YRV non-turbo that spend more time plugged into the diagnostic computer than it did on the road!!!) i've come form a Honda Civic VTi 1.8 Aerodeck putting out about 168bhp to my Marea 105 JTD.
First impressions are that i like the feel and the drive of the Marea but it would have been nice to have the power of the 2.4JTD - except for the repair costs on those!!!!! So a nice compromise would be to chip tune my 105 to somewhere around 125/130 bhp and 185/200lb/ft torque. Nothing that puts too much strain on the engine but just enough to really annoy those outside lane hogs on the way to work!

Other than the chip-tune, is there anything else you'd recomend to improve drivability without sacrificing ecconomy?

 

[Venters]

aye it would be okay. If his figures are accurate but they are not.

130bhp 2.4 is only just under 10 seconds to 60

8.79 is is only slightly slower than the 20v and thats much more powerful and petrol and when comparing 0-60 petrol will always be much quicker even with the same power just because of the way they are geared and the way they both deliver their power.

 

[tazztham]

me too...feel like hitting 60 below 9sec on a JTD105 weekend is hard to beat. i also plug-in a Vector-Tuning box on my 105JTD running 100% diesel. only manage to clock below 11sec with my JTD105. before tune-up, the time was 12+sec.

it might not improve alot in term of drag race but the pulling in mid range is the benefit when cutting lanes or over taking...

 

[JTDLee]

Well chaps, the tuning box I got was from ebay, a company in germany called abrieb. Their boxes are £200 odd quid from online shop, but sell in auctions too for far less. Keep eyes peeled. The same pistons, crank, cam etc in my engine as the alfa 150bhp version so don't worry about the internals.

Performance testing carried out after testing speedo against GPS speedo-my car doing 61 mph at actual 60m.p.h. Stop watch, average of 3 runs. dry road, 2000 rpm, dump clutch and hit gas at same time=-best launch. rev to 4.5 thousand.

Had this confirmed having 3 off the lights runs with an astra 1.9cdti 150 brake (officially 8.9 to 60mph) on new years day. almost a dead heat to about 60mph but I always got better launch and stuck half a car out, which he couldn't reel back in. At 3rd lights he put window down and asked me if it was standard, was surprised it was running on veg oil too. I was pretty surprised his was the 150bhp Astra version, I'd presumed a 120. Bloody good engines these Fiat lumps, and of course the astra has the same Fiat engine with vauxhall bits on.

If and when this engine has had it, (which seems unlikely in the near future) I'll be after the new multijet 188bhp motor, which is rumoured to be based on the same block yet again.

 

[JTDLee]

aye it would be okay. If his figures are accurate but they are not.

130bhp 2.4 is only just under 10 seconds to 60

8.79 is is only slightly slower than the 20v and thats much more powerful and petrol and when comparing 0-60 petrol will always be much quicker even with the same power just because of the way they are geared and the way they both deliver their power.

Also! the just under 10 for the JTD130 is from a car mag, and I reckon I could shave a bit off that, it's amazing how many people don't know how to drive. I'd like to stick my chip on one of those, be very swift. AND, the 20v has quite a bit less torque.

 

[Venters]

Also! the just under 10 for the JTD130 is from a car mag, and I reckon I could shave a bit off that, it's amazing how many people don't know how to drive. I'd like to stick my chip on one of those, be very swift. AND, the 20v has quite a bit less torque.

It's from Parkers. A fairly accurate source.
Also I've pulled from a mapped 10V 156 JTD.
I've no doubt your 105 is much faster than standard. But the thing you must remember is that diesel feels faster than petrol even when it isn't.

 

[JTDLee]

Diesel feels faster? I disagree totally, think petrol feels faster with all those revs giving the sensation of more speed. Torque feels effortless, power is frenetic. I'm not a fantasy man, I don't make my figures up, the clock and evidence doesn't lie. I also happen to own a nice vw golf gti mk2 8v, and we've done mate driving fiat against golf, mate driving golf against fiat, side by side several times and the fiat is quicker to the ton by 2 car lengths or so. We did it because we couldn't believe the marea was quicker by the clock, because the golf feels much quicker inside. It 's because the golf has less torque, is lower geared and has to make more of a song and dance to do the same business . Still like the golf though, but fancy the 150 brake gttdi motor in it. Ah, the good old days of the 900kg car...Can't be doing with all this thirsty petrol engine business nowadays though. But the marea and the golf aren't serious performers, I'd like thrice the power ideally. Yes, little time for petrol apart from pootling in a certain '68 plymouth barracuda I'll be selling for a friend soon. Nicely sorted car with 6 litre mopar V8, about 300bhp. Interested to see how it goes against the Marea......looking for about £6k, right hand drive, lots of summer fun.

 

[Venters]

Ofcourse diesel feels faster. all the torque comes in low with the boost and pins you back in your seat giving the impression of rapid acceleration. Petrols builds more slowly at first getting quicker as the revs increase. so at no point do you have the explosion of acceleration.

Mopar! you can get 300bhp out of a 2.4 diesel!

 

[JTDLee]

Ofcourse diesel feels faster. all the torque comes in low with the boost and pins you back in your seat giving the impression of rapid acceleration. Petrols builds more slowly at first getting quicker as the revs increase. so at no point do you have the explosion of acceleration.

Mopar! you can get 300bhp out of a 2.4 diesel!

No explosion? You've obviously never driven a v-tec or a petrol with a big turbo. Anyway, no, still disagree, the diesel torque gives you a stout swelling shove, the power gives you a rush over 3000rpm in a petrol, even smooth non turbo one.

And you can't get 300bhp out of a 40 year old 2.4 diesel.....


Nice looking marea by the way. Is the ride not a tad hard with it that low?

 

[Venters]

No explosion? You've obviously never driven a v-tec or a petrol with a big turbo. Anyway, no, still disagree, the diesel torque gives you a stout swelling shove, the power gives you a rush over 3000rpm in a petrol, even smooth non turbo one.

And you can't get 300bhp out of a 40 year old 2.4 diesel.....


Nice looking marea by the way. Is the ride not a tad hard with it that low?

Vtecs overrated. And yeah a big turbo petrol will give the explosion but I was making my comparison between TD and NA petrol.
I suppose if we are talking about a 40 year old diesel we can drop a zero of that number.

Car rides fine that low. It's the profile on the tires that makes mine feel hard compared to normal.

 

[donny lad]

aye it would be okay. If his figures are accurate but they are not.

130bhp 2.4 is only just under 10 seconds to 60

8.79 is is only slightly slower than the 20v and thats much more powerful and petrol and when comparing 0-60 petrol will always be much quicker even with the same power just because of the way they are geared and the way they both deliver their power.

this is true what he says, has this diesel been down a drag strip or a dyno? sorry but after what people have said about my car on other sites i dont believe mate to say you have cut 5secs or so off ure 0-60 time is like saying you found the cure to cancer lol what have you done to youre engine to make it faster than more powerful cars? the astra says its 150bhp but doesn't mean the guy driving is any good, my hgt was running about 15bhp before i rebuilt the thing and that would keep up with an imprezza 2000 awd turbo sometimes but doesn't mean to say it would kill it lol before anybody asks that car is only about 175bhp as it the bottom range.

not been funny mate just know that sometimes you cant just take things at face falue:slayer:

 

[Hellcat]

If the Astra 150 multijet is anything like my Bravo then it'll be a couple hundred KG heavier. I wouldn't be suprised with anything upto 150bhp from the 100/105JTD and 180bhp from the 2.4 130JTD, so much reduced times may be do-able.

Still really need some timed 1/4 mile figures between light beams to really give your 0-60 and 0-100. Using a stopwatch can easily be 1 second out (1/2 sec out starting and 1/2 sec stopping).

 

[JTDLee]

If the Astra 150 multijet is anything like my Bravo then it'll be a couple hundred KG heavier. I wouldn't be suprised with anything upto 150bhp from the 100/105JTD and 180bhp from the 2.4 130JTD, so much reduced times may be do-able.

Still really need some timed 1/4 mile figures between light beams to really give your 0-60 and 0-100. Using a stopwatch can easily be 1 second out (1/2 sec out starting and 1/2 sec stopping).

Granted, stopwatch can be out, that's why you do it several of times and take an average.

And to the previous chap: It hasn't knocked 5 seconds off, you 'narna, it did 0-60 in 11 dead as standard, and it sure doesn't do it in 6 secs now, I'd need 190bhp ish. Shaved off about 2 secs. And a standard Mk1 impreza turbo hit 60 in 5.3, and 100 in just over 14, and had great traction, so how on earth did your marea stay with one?

I have a quarter mile marked on a remote straight stretch of road about 12 miles south of leicester, you get the starter with the stopwatch on the finish line on the phone, he counts you down and stops when you get to him. Give you a good idea, I'll go and test it, expecting around mid to late 16 second run.

 

[donny lad]

Granted, stopwatch can be out, that's why you do it several of times and take an average.

And to the previous chap: It hasn't knocked 5 seconds off, you 'narna, it did 0-60 in 11 dead as standard, and it sure doesn't do it in 6 secs now, I'd need 190bhp ish. Shaved off about 2 secs. And a standard Mk1 impreza turbo hit 60 in 5.3, and 100 in just over 14, and had great traction, so how on earth did your marea stay with one?

I have a quarter mile marked on a remote straight stretch of road about 12 miles south of leicester, you get the starter with the stopwatch on the finish line on the phone, he counts you down and stops when you get to him. Give you a good idea, I'll go and test it, expecting around mid to late 16 second run.

not been funny but ya figures are wrong an imprezza 2000 awd turbo wont do 60 that quick thats more wrx times than anything there std time is 6.9 then with different models gets quicker lol my mate is dead chuffed though to ure claims lol seeing as it was his 200awd that got me going up against other turbo's lol i understand where a coming from but to post a figure like that which hasnt been tested via gprs at a strip you cant expect us to believe ya, god knows ure diesel is quicker than before but that makes it faster than a 147 2.0l which is 150bhp ish

 

[JTDLee]

not been funny but ya figures are wrong an imprezza 2000 awd turbo wont do 60 that quick thats more wrx times than anything there std time is 6.9 then with different models gets quicker lol my mate is dead chuffed though to ure claims lol seeing as it was his 200awd that got me going up against other turbo's lol i understand where a coming from but to post a figure like that which hasnt been tested via gprs at a strip you cant expect us to believe ya, god knows ure diesel is quicker than before but that makes it faster than a 147 2.0l which is 150bhp ish

As far as I know they only offered 2 models of impreza for the Mk1 and facelift in the UK, a normally aspirated gutless affair, and the turbo which first had 208bhp, then in '97 got 215bhp. I never heard of a uk impreza with 175bhp. my figures are for the 208 bhp and are right as tested by autocar. Are you talking about an import?

Also, you seem to have little faith in your abilities to time your car with a reasonable (to less than half a second) degree of accuracy. We timed my friend's car several times with a stopwatch on our accurately measured quarter mile, and found it to be right within a tenth of a second when he did an rwyb at santa pod.

Perhaps the vegetable oil adds a bit of power...

 

[sym stilo]

Hi there was just wondering about the veg oil mix,do you have to add anything extra to the engine to cope like a heating coil?or can you just mix diesel and veg oil and put it in the tank together and use strait like that?I have the stilo 115 jtd.would you also recommend a diesel tuning box?thanks

Granted, stopwatch can be out, that's why you do it several of times and take an average.

And to the previous chap: It hasn't knocked 5 seconds off, you 'narna, it did 0-60 in 11 dead as standard, and it sure doesn't do it in 6 secs now, I'd need 190bhp ish. Shaved off about 2 secs. And a standard Mk1 impreza turbo hit 60 in 5.3, and 100 in just over 14, and had great traction, so how on earth did your marea stay with one?

I have a quarter mile marked on a remote straight stretch of road about 12 miles south of leicester, you get the starter with the stopwatch on the finish line on the phone, he counts you down and stops when you get to him. Give you a good idea, I'll go and test it, expecting around mid to late 16 second run.