JGM Project car
sounds amazing! What boost can the turbos run at?
10 March 2012, 01:17 AM
#817
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they could run at 2.5bar and then engine would have no issue with that but it wouldnt necessarily make more power at that.
the aim when it was last on the dyno was 1.5bar.. next time it will be to have a play and see what happens with more boost.. however 680lb is into 6spd gearbox breaking territory so likely to cap the torque that or 700lb ish..
Simon
the aim when it was last on the dyno was 1.5bar.. next time it will be to have a play and see what happens with more boost.. however 680lb is into 6spd gearbox breaking territory so likely to cap the torque that or 700lb ish..
Simon
19 March 2012, 01:45 AM
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first shake down of the car today at MLR 30-130 event, no pics as RAF base so not allowed.
Rolling along in second at 20mph along the runway, into the coned area and throttle in and it just spins up all four wheels and I have to fight to keep it straight, into third and it spins up, grab fourth and it spins but grips a bit and a big shove down the runway with a bit of a wiggle mid rpm glance over to see 130mph on the vbox, slick 5th and the window folds outwards lol watch cj wrestle it back into line as I level the throttle (trying not to come straight off it as I have no idea how the car is going to behave decellerating at that speed and there is a fair side wind and it is very slippery) and glance to see speed on vbox and then compute the fact I need to slow down now.
That was the first drive of the car in anger (all be it medium anger at that point)
Windows fixed and a bit of time spent on laptop and notice the car is taking on a lot more air on the runway than on the dyno and power appears to continue much higher up the rev range, more on that later.
second run out.. on the last run I was feeding throttle in slowly and only got to full throttle once in 4th...and was short shifting and not really paying attention to rpm. So this run out now after lunch I try and use more throttle and with more confidence in the car try to push it harder.. CJ is still in the car for morral support, fire fighter, window catcher, ballast lol.
Much more aggressive run but slower and a lot more wheel spin but wheel spin where you dont go anywhere and not so sideways as the first run but its slower..
More datalog analysis and a few more changes to the map.
So third run out and the track is now damp rather than wet and no puddles and I have adjusted the tyre pressures again and dropped the boost to 1.1bar and I have a little more grip and I have a lot more confidence in the car and have left CJ in the pits this time..
wheel spin through 2nd and 3rd and fourth grips and away we go, slick 5th and then 6th and then think I should check the speed to see 165mph and look back foot still nailed as the bonnet scoop pops up an inch on the drivers side lol.. lift off and cruise back..
Its now time for event to finish.. I was just at the point now where I was confident fully with the car and could start actually trying for a good time rather than checking the car out.. but very happy with 4th today out of 42cars and 9th over the two days out of 87cars for cars first outting.
bonnet scoop and 170mph = fail lol I didnt intend going over 140mph today but got carried away, hence still had bonnet scoop and big rear spoiler on.
Many thanks to CJ for all his help today.
Simon
Rolling along in second at 20mph along the runway, into the coned area and throttle in and it just spins up all four wheels and I have to fight to keep it straight, into third and it spins up, grab fourth and it spins but grips a bit and a big shove down the runway with a bit of a wiggle mid rpm glance over to see 130mph on the vbox, slick 5th and the window folds outwards lol watch cj wrestle it back into line as I level the throttle (trying not to come straight off it as I have no idea how the car is going to behave decellerating at that speed and there is a fair side wind and it is very slippery) and glance to see speed on vbox and then compute the fact I need to slow down now.
That was the first drive of the car in anger (all be it medium anger at that point)
Windows fixed and a bit of time spent on laptop and notice the car is taking on a lot more air on the runway than on the dyno and power appears to continue much higher up the rev range, more on that later.
second run out.. on the last run I was feeding throttle in slowly and only got to full throttle once in 4th...and was short shifting and not really paying attention to rpm. So this run out now after lunch I try and use more throttle and with more confidence in the car try to push it harder.. CJ is still in the car for morral support, fire fighter, window catcher, ballast lol.
Much more aggressive run but slower and a lot more wheel spin but wheel spin where you dont go anywhere and not so sideways as the first run but its slower..
More datalog analysis and a few more changes to the map.
So third run out and the track is now damp rather than wet and no puddles and I have adjusted the tyre pressures again and dropped the boost to 1.1bar and I have a little more grip and I have a lot more confidence in the car and have left CJ in the pits this time..
wheel spin through 2nd and 3rd and fourth grips and away we go, slick 5th and then 6th and then think I should check the speed to see 165mph and look back foot still nailed as the bonnet scoop pops up an inch on the drivers side lol.. lift off and cruise back..
Its now time for event to finish.. I was just at the point now where I was confident fully with the car and could start actually trying for a good time rather than checking the car out.. but very happy with 4th today out of 42cars and 9th over the two days out of 87cars for cars first outting.
bonnet scoop and 170mph = fail lol I didnt intend going over 140mph today but got carried away, hence still had bonnet scoop and big rear spoiler on.
Many thanks to CJ for all his help today.
Simon
19 March 2012, 09:58 AM
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19 March 2012, 12:19 PM
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I only had chance to do 3runs and only on the third did I get carried away didnt mean to go beyond 140 but just felt right..
car still had stupid (for high speed runs) rear spoiler.
Simon
19 March 2012, 04:13 PM
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Rear spoiler is not stupid for the high speed runs at all Simon, didn't you notice I had brought my one along! Then of course never fitted it as my 1st run was just a 'get the feel of it' run but as you say, it feels ok so you end up just going a bit further. Not a fan of top speed runs personally. Things can go wrong very quickly at 70mph, never mind 3x that speed.
19 March 2012, 04:26 PM
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I meant its not best for going at a top speed run aero dynamically but it is for braking at the end.. catch 22.. need a moving wing
totally agree on the happenning quickly!
totally agree on the happenning quickly!
19 March 2012, 05:41 PM
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You would be surprised. Back in 2005 when we were doing tops speeds at Bruntingthorpe the Spoiler off didnt make a squat of difference to ultimate top speeds.
The more I look at that colour in different pictures the more I think my wheels are that colour but I won't know till I'm parked next to you at the track