670 replies to this topic

[vocky]

PM'ed
ref sprockets

Are they these ones (#11)
HERE

[FLD]

Latest parts arrived

Say what you see.....

I see my springs and top caps!

Saab sprockets are the same as Z22 ones just without the timing tab. The clamping force of the bolt is what keeps it in place. You could just grind out the tab, although if our Z22 sprockets are like mine you could have a couple of degrees tinkerage in there already. Just see how your cams time up.

[Nev]

Careful Jimmy, if you go over 250 BHP the 'nay-slayers' on here will giving you grief Good luck with all the mods.

[AliM]

'nay-slayers'

horse abuse?

[JimmyJamJerusalem]

PM'ed
ref sprockets

Say what you see.....

I see my springs and top caps!

Saab sprockets are the same as Z22 ones just without the timing tab. The clamping force of the bolt is what keeps it in place. You could just grind out the tab, although if our Z22 sprockets are like mine you could have a couple of degrees tinkerage in there already. Just see how your cams time up.

Careful Jimmy, if you go over 250 BHP the 'nay-slayers' on here will giving you grief

Good luck with all the mods.

eh.... I'm already over 250bhp.

'nay-slayers'

horse abuse?

You and horses

[Mike (Cliffie)]

Careful Jimmy, if you go over 250 BHP the 'nay-slayers' on here will giving you grief

Good luck with all the mods.

That I doubt as most stage 2 Supercharged cars do that as do most stage 2 Tubbies.

I think the fingers poke when you make a car too powerful to drive in anger or round corners and too powerful for the drivetrain but hey, what do I know.

[JimmyJamJerusalem]

Careful Jimmy, if you go over 250 BHP the 'nay-slayers' on here will giving you grief

Good luck with all the mods.

That I doubt as most stage 2 Supercharged cars do that as do most stage 2 Tubbies.

I think the fingers poke when you make a car too powerful to drive in anger or round corners and too powerful for the drivetrain but hey, what do I know.

Anything can be driven in anger!!! I'd love to take Nevs car out on track!

[The Batman]

Careful Jimmy, if you go over 250 BHP the 'nay-slayers' on here will giving you grief

Good luck with all the mods.

That I doubt as most stage 2 Supercharged cars do that as do most stage 2 Tubbies.

I think the fingers poke when you make a car too powerful to drive in anger or round corners and too powerful for the drivetrain but hey, what do I know.

Anything can be driven in anger!!! I'd love to take Nevs car out on track!

wouldnt want to drive it on the road though

[Nev]

Nipper is surprisingly drivable on the road, though clearly you have to exercise some caution. I think my diff helps a good deal to overcome the torque (thank goodness). The chaps I took out this weekend were surprised how my tyres put it all down but I do wonder how my gearbox takes it though, but it's of little consequence if it breaks, as a second hand one is £100 and a weekend of work in the garage for me. How much power is/will your car making now Jimmy, as it was around 250/260 BHP mark when I saw it last? Cliffie, the car is quite well mapped by Klassen, it's quite possible to feather the throttle round the corners with just as much control as my old stage 4 tune. I think a SC car would be better though in general as it would be super controllable. I can understand why your chaps think it's too OTT, but in practice, once you learn it's power delivery, you can predict it's performance pretty well.

[MrSimba]

Nev I was amazed at how well your car put the power down, above 4000rpm very very smooth and the tyres never struggled for traction despite the onslaught of torque thrown at them!!! The fact you drove a 170 mile round trip in November and gave numerous pax rides at WOT shows what a capable car you've created I did think I was going to die on a couple of occasions tho... I'd love to hear Jimmys or Max's thoughts if they got to drive or experience Nippers power compared to their race cars, it is absolutely brutal!

Edited by MrSimba, 07 November 2011 - 08:42 PM.

[luke.]

I love brutal.. Just the feeling of boost even if it is in a smaller powerband i just love that feeling of being pushed back in the seat. Can't wait to get my new engine Oh and im gutted i never made it to the midlands meet

Edited by luke., 07 November 2011 - 08:48 PM.

[Mike (Cliffie)]

Cliffie, the car is quite well mapped by Klassen, it's quite possible to feather the throttle round the corners with just as much control as my old stage 4 tune. I think a SC car would be better though in general as it would be super controllable. I can understand why your chaps think it's too OTT, but in practice, once you learn it's power delivery, you can predict it's performance pretty well.

I have no doubt is is Nev and hats off to you fella for A. Building it and B. Being able to drive it.

If truth be told, I do kinda buy into "there can never be too much power" but I also know that you can have too much power for any specific chassis and it's limits.

I can't comment on Nipper as I have never been out in it and if you say it is drivable, I believe you. I only have 263 BHP and I thought mine was quick, yours must be mind altering.

[MrSimba]

I can't comment on Nipper as I have never been out in it and if you say it is drivable, I believe you. I only have 263 BHP and I thought mine was quick, yours must be mind altering.

Mike honestly I've been getting used to 300bhp over the last few weeks which is a very quick car (0-100 in 7.5 seconds) but it feels sedate after pax'ing with Nev! It really is a sensory assault!

[Nev]

I have no doubt is is Nev and hats off to you fella for A. Building it and B. Being able to drive it.

If truth be told, I do kinda buy into "there can never be too much power" but I also know that you can have too much power for any specific chassis and it's limits.

I can't comment on Nipper as I have never been out in it and if you say it is drivable, I believe you. I only have 263 BHP and I thought mine was quick, yours must be mind altering.

IMO the chassis is deffo not a limiting factor on the VX, it has a tortional ridgity of 11500 newton/metres per degree longitudinally, much more than any factory made monocoque design (spot or seam welded). Even something like an Ultima TIG welded spaceframe would not be much more than that, and the Ultima factory reckon their chassis is good for 1000 BHP (and was heavily used as a testbed by McLarren for the F1). Added to that I can feel that the chassis is quite fine when planting the power, no probs at all in straight lines or curves.

IMO the weak point is certainly the clutch and gearbox. The clutch could be remedied by fitting a TTV 7.25" fly and Supaclutch twin plate which would be good for around 625 BHP and around 450 ft/lb on my engine. That would only be £1200, so in the scale of things not so much.

If could afford a 3rd party gearbox with straight cut gears (ideally sequential as well), then I could fit something like 265 or 285 rear wheels (with arch extensions) and take the boost upto 2.5 bar and see what happened. I suspect the current turbo would make over 600 BHP at 8000 revs, and maybe 625 BHP at 8500 if I raised the RPM limit.

However, I aint that rich and there is clearly risk in pushing the engine up another 125 BHP, which is not really worth it IMO. I'd rather keep my current config and hope it lasts 20 or 30 thousand miles (or more hopfeully).

Edited by Nev, 07 November 2011 - 09:50 PM.

[techieboy]

IMO the chassis is deffo not a limiting factor on the VX, it has a tortional ridgity of 11500 newton/metres per degree longitudinally, much more than any factory made monocoque design (spot or seam welded). Even something like an Ultima TIG welded spaceframe would not be much more than that, and the Ultima factory reckon their chassis is good for 1000 BHP (and was heavily used as a testbed by McLarren for the F1). Added to that I can feel that the chassis is quite fine when planting the power, no probs at all in straight lines or curves.

Is that including the engine subframe? I know the tub itself is massively rigid but not so sure the subframe with it's 4 bolts holding it on is in quite the same league.

[jules_s]

Re: Nipper When i went out in it, the first few miles Nev was warming it up....I said to him I thought it was very 'compliant' iirc. Not much different to my 2+ NA under 3k Nev: 'It's a boost car mate' On boost to rev limit nipper is a mentalist

[Nev]

IMO the chassis is deffo not a limiting factor on the VX, it has a tortional ridgity of 11500 newton/metres per degree longitudinally, much more than any factory made monocoque design (spot or seam welded). Even something like an Ultima TIG welded spaceframe would not be much more than that, and the Ultima factory reckon their chassis is good for 1000 BHP (and was heavily used as a testbed by McLarren for the F1). Added to that I can feel that the chassis is quite fine when planting the power, no probs at all in straight lines or curves.

Is that including the engine subframe? I know the tub itself is massively rigid but not so sure the subframe with it's 4 bolts holding it on is in quite the same league.

Hmm, you have a good point Techie, I've not really looked at how it's fixed. Peprhaps it's 4 bolts could be augmented with extras or maybe just make a new spaceframe to replace it. That said though, has anyone had it fail in any sort of way? I think it's main job is to provide 1 of 4 engine mounts and keep the exhaust pipe and clam from dropping on the floor.

[techieboy]

AtomX is in the process of making a new subframe to suit his project and his particular engine. I guess the whole point of the way the subframe is attached is that it separates in the event of a big accident (much like that Enzo that had the big smash in the States split into three pieces). Just looks a little when you have the clam off and see the two M12 bolts on each side, holding it to the tub. That said, I've no idea how normal/abnormal that is, as I've never seen the innards of another car, as often as this.

[VX-GT]

AtomX is in the process of making a new subframe to suit his project and his particular engine. I guess the whole point of the way the subframe is attached is that it separates in the event of a big accident (much like that Enzo that had the big smash in the States split into three pieces). Just looks a little when you have the clam off and see the two M12 bolts on each side, holding it to the tub. That said, I've no idea how normal/abnormal that is, as I've never seen the innards of another car, as often as this.

Don't drag me into this
I have already stated that nev is in a different league to me

[Nev]

Re: Nipper

When i went out in it, the first few miles Nev was warming it up....I said to him I thought it was very 'compliant' iirc. Not much different to my 2+ NA under 3k

Nev: 'It's a boost car mate'

On boost to rev limit nipper is a mentalist

Jules, I don't want to worry you, but I didnt take it to the rev limit when you were in it cos of the traffic and all those white hashing/lines on the centre of the main straight, I think we only went to about 6500 revs approx (which is only about 400 BHP). There will be a next time if you like

Edited by Nev, 07 November 2011 - 10:39 PM.