Supercharged AJP8. one last step!
Discussion
Had a lot of interesting fun at castle Coombe trying out the new parts on the rear.
I was really lucky as AST suspension had a couple of guys down in the pits offering advice and support. They were very interested in helping out with the Cerbera .
The first time out the car was as follows
Pirelli p zero tyres 30psi hot
No ARB
Wing quiet steep
20 click up on Nitrons
Car was very soft at rear grip level better than the original settings but the car dug in far to much on acceleration.
Second time ou as above but ARB connected.
Very similar but less lift of bonnet on acceleration, didn’t notice any difference in grip.
Third time out ARB connected, 25 clicks on Nitrons, less angle on spoiler. Again an improvement but not game changing.
Fourth time out ARB connected, 25 clicks on Nitrons, same angle on wing 10degrees approx, Nankang AR1 track tyres. Big big difference, massive levels of grip no drift or oversteer exiting corners and power down much earlier. Braking more stable. Only issue was the car still digs in on acceleration enough to make the rear tyres run.
Unfortunately the car developed a high RPM misfire in the afternoon so had to short shift.
AST were great and I think the setup will be great with a stronger set of springs on the rear. They are 325 atm so going to go with 400. Hopefully this will reduce the lifting on acceleration.
I don’t know what are good times around Coombe but even short shifting at 5000rpm I was managing 1.16. I recon with better springs more time in the car and no misfire 1.13 are possible.
I’ll update the thread each time I make changes or modify to the car. Hope you find In interesting.
I was really lucky as AST suspension had a couple of guys down in the pits offering advice and support. They were very interested in helping out with the Cerbera .
The first time out the car was as follows
Pirelli p zero tyres 30psi hot
No ARB
Wing quiet steep
20 click up on Nitrons
Car was very soft at rear grip level better than the original settings but the car dug in far to much on acceleration.
Second time ou as above but ARB connected.
Very similar but less lift of bonnet on acceleration, didn’t notice any difference in grip.
Third time out ARB connected, 25 clicks on Nitrons, less angle on spoiler. Again an improvement but not game changing.
Fourth time out ARB connected, 25 clicks on Nitrons, same angle on wing 10degrees approx, Nankang AR1 track tyres. Big big difference, massive levels of grip no drift or oversteer exiting corners and power down much earlier. Braking more stable. Only issue was the car still digs in on acceleration enough to make the rear tyres run.
Unfortunately the car developed a high RPM misfire in the afternoon so had to short shift.
AST were great and I think the setup will be great with a stronger set of springs on the rear. They are 325 atm so going to go with 400. Hopefully this will reduce the lifting on acceleration.
I don’t know what are good times around Coombe but even short shifting at 5000rpm I was managing 1.16. I recon with better springs more time in the car and no misfire 1.13 are possible.
I’ll update the thread each time I make changes or modify to the car. Hope you find In interesting.
I remember once mike, in his cerb race car, telling me his rears were up above 600.
I have nitrons 450 fronts and 350 rears on my Cerb, No ARB. I feel that gives me a fairly stiff ride but still weak enough to let the wheels tuck up into the arches. Not sure I would want to run stiffer than that on the roads near me. But quite happy to compromise on teh track
I have nitrons 450 fronts and 350 rears on my Cerb, No ARB. I feel that gives me a fairly stiff ride but still weak enough to let the wheels tuck up into the arches. Not sure I would want to run stiffer than that on the roads near me. But quite happy to compromise on teh track
Hello, I saw your post on FB, I also did some tests, but with old and dry AR1s, I just noticed by disconnecting the torsion bar, a slight understeer, which would seem to say that disconnecting gives more traction on the rear axle, but, for you, the result is better when you connect the torsion bar, otherwise, have you considered increasing the width of the tires, to adapt it to the power of the motor
I’m running 255 35 18 at the moment and they already rub on the drivers side under hard cornering. I’m going to fit the 475lb springs and try them.I want to check the clearance on the inside of the wheel. Maybe the offset is not ideal but I’m fairly sure 255 is very near the maximum I can fit on my car without body mods.
a1rak said:
Had a lot of interesting fun at castle Coombe trying out the new parts on the rear.
I was really lucky as AST suspension had a couple of guys down in the pits offering advice and support. They were very interested in helping out with the Cerbera .
The first time out the car was as follows
Pirelli p zero tyres 30psi hot
No ARB
Wing quiet steep
20 click up on Nitrons
Car was very soft at rear grip level better than the original settings but the car dug in far to much on acceleration.
Second time ou as above but ARB connected.
Very similar but less lift of bonnet on acceleration, didn’t notice any difference in grip.
Third time out ARB connected, 25 clicks on Nitrons, less angle on spoiler. Again an improvement but not game changing.
Fourth time out ARB connected, 25 clicks on Nitrons, same angle on wing 10degrees approx, Nankang AR1 track tyres. Big big difference, massive levels of grip no drift or oversteer exiting corners and power down much earlier. Braking more stable. Only issue was the car still digs in on acceleration enough to make the rear tyres run.
Unfortunately the car developed a high RPM misfire in the afternoon so had to short shift.
AST were great and I think the setup will be great with a stronger set of springs on the rear. They are 325 atm so going to go with 400. Hopefully this will reduce the lifting on acceleration.
I don’t know what are good times around Coombe but even short shifting at 5000rpm I was managing 1.16. I recon with better springs more time in the car and no misfire 1.13 are possible.
I’ll update the thread each time I make changes or modify to the car. Hope you find In interesting.
1.16s is quick at combe, 1.13s are VERY quick! Impressive times!I was really lucky as AST suspension had a couple of guys down in the pits offering advice and support. They were very interested in helping out with the Cerbera .
The first time out the car was as follows
Pirelli p zero tyres 30psi hot
No ARB
Wing quiet steep
20 click up on Nitrons
Car was very soft at rear grip level better than the original settings but the car dug in far to much on acceleration.
Second time ou as above but ARB connected.
Very similar but less lift of bonnet on acceleration, didn’t notice any difference in grip.
Third time out ARB connected, 25 clicks on Nitrons, less angle on spoiler. Again an improvement but not game changing.
Fourth time out ARB connected, 25 clicks on Nitrons, same angle on wing 10degrees approx, Nankang AR1 track tyres. Big big difference, massive levels of grip no drift or oversteer exiting corners and power down much earlier. Braking more stable. Only issue was the car still digs in on acceleration enough to make the rear tyres run.
Unfortunately the car developed a high RPM misfire in the afternoon so had to short shift.
AST were great and I think the setup will be great with a stronger set of springs on the rear. They are 325 atm so going to go with 400. Hopefully this will reduce the lifting on acceleration.
I don’t know what are good times around Coombe but even short shifting at 5000rpm I was managing 1.16. I recon with better springs more time in the car and no misfire 1.13 are possible.
I’ll update the thread each time I make changes or modify to the car. Hope you find In interesting.
The body mods are worth considering. In mine its wasn't much more than a slitting saw inside the arch to cut away the horizontal lip and then push the outside and inside together with the appropriate amount of gel inbetween.
It took a weekend but the tyres now tuck up under the full range of the springs.
It took a weekend but the tyres now tuck up under the full range of the springs.
That’s worth considering. I don’t mind modding the lips and inner arches I was just trying to avoid body mods that can be seen from the outside. I did take a portion of the inner arch away to reduce the rubbing but was not going to do any more until I had the rear uprated rear springs fitted
julian64 said:
I remember once mike, in his cerb race car, telling me his rears were up above 600.
I have nitrons 450 fronts and 350 rears on my Cerb, No ARB. I feel that gives me a fairly stiff ride but still weak enough to let the wheels tuck up into the arches. Not sure I would want to run stiffer than that on the roads near me. But quite happy to compromise on teh track
Yup close to standard which is 400 front , 350 rear on Nitrons for the Cerbera. This is for road going and I have the shocks set soft for todays awful roads.I have nitrons 450 fronts and 350 rears on my Cerb, No ARB. I feel that gives me a fairly stiff ride but still weak enough to let the wheels tuck up into the arches. Not sure I would want to run stiffer than that on the roads near me. But quite happy to compromise on teh track
Product code 0900-225-0400S and 0900-225-0350SS 2.25" springs
Obligatory pic after the rebuild - not bad for 15 year old shocks
DuncanM said:
Jhonno said:
600/600 is what Martin Short has put on a mate's Cerb recently, and I am running too..
Oh cool, what do you think of the set up? I can still get the car to feel nice and compliant, but that's down to damper settings. I'm glad I made the change
It seems good to me too, ride was still more than acceptable with Nitrons. No ARB fitted.
Jhonno said:
My mate loves his (he lives in the Fens too, bumpy AF).
It seems good to me too, ride was still more than acceptable with Nitrons. No ARB fitted.
Excellent, I think it's right on the money for me, and with sensible damper settings, the ride is good.It seems good to me too, ride was still more than acceptable with Nitrons. No ARB fitted.
I found with softer springs, the temptation was always there to up the damping to reduce lean, which made the car feel overdamped.
People put 600 on Elises, and they're almost half the weight of our cars
Yes that was me. It was great fun with a big spectrum of cars. The Cerb still has a major cut out / misfire at just under 5k rpm which is really annoying so still have to short shift.
Going to change crank sensor as the laptop mapping shows the rpm dropping from 5k to 0rpm instantly.
Will probably change coil packs and ht leads at the same time whilst I’ve got everything apart
Going to change crank sensor as the laptop mapping shows the rpm dropping from 5k to 0rpm instantly.
Will probably change coil packs and ht leads at the same time whilst I’ve got everything apart
a1rak said:
I’m running 255 35 18 at the moment and they already rub on the drivers side under hard cornering. I’m going to fit the 475lb springs and try them.I want to check the clearance on the inside of the wheel. Maybe the offset is not ideal but I’m fairly sure 255 is very near the maximum I can fit on my car without body mods.
I am running 265 35 18 with ET+33 and it don't touch strong
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