359 replies to this topic

[Scuffers]

Great shots! The front splitter looks really low. Surprised it wasn't damaged by a kerb at some point.

it was

that's what happens when you go grass-cutting!

[Mike (Cliffie)]

Great shots! The front splitter looks really low. Surprised it wasn't damaged by a kerb at some point.

it was

that's what happens when you go grass-cutting!

Like you know, you had gone home by this time and you have no idea why the grass is on there.

[Scuffers]

Great shots! The front splitter looks really low. Surprised it wasn't damaged by a kerb at some point.

it was :angry2:/>

that's what happens when you go grass-cutting!

Like you know, you had gone home by this time and you have no idea why the grass is on there.

Lol!
If it was me, I would have hid the evidence....

[Mike (Cliffie)]

Great shots! The front splitter looks really low. Surprised it wasn't damaged by a kerb at some point.

it was :angry2:/>

that's what happens when you go grass-cutting!

Like you know, you had gone home by this time and you have no idea why the grass is on there.

Lol!
If it was me, I would have hid the evidence....

Sadly the evidence is out of my hands...

Visit to the grass was due to the car cutting out and having to get out of the way. Soon restarted and all was good.

[techieboy]

Are you any closer to a verdict on your engine woes, Simon? Hopefully nothing that's not relatively easy to sort.

[CocoPops]

Jamie posted on FB, summat to do with a DV that was too small, so the block tried to vent boost through the Headgasket?

[techieboy]

Oooh. Not helpful.

[CocoPops]

In fact, here ya go:

Great news. All that happened to our engine is that the head gasket failed. The head would have lifted due to the excess boost created when our undersized wastegate couldn't cope. Everything else is fine, so we're now busy sorting out a new wastegate control setup for this monster and making a few tweeks from what we have learnt. Everything should be good to go again in a couple of weeks and then the proper mapping can get underway.

[techieboy]

[JG]

certainly looks low doesn't it

[chris_uk]

That diffuser needs lowering more and i have the perfect idea of how to do it..

[Mike (Cliffie)]

That diffuser needs lowering more and i have the perfect idea of how to do it..

We need to keep rake on it though.

[SteveA]

You thought about using side skirts to reduce side leakage?

[Mike (Cliffie)]

You thought about using side skirts to reduce side leakage?

Steve, I have thought about many things but time and mostly money limits our development.

I am about as far as I will go with the VX now and next year will even see things wound back a little.

[Scuffers]

Are you any closer to a verdict on your engine woes, Simon? Hopefully nothing that's not relatively easy to sort.

In fact, here ya go:

Great news. All that happened to our engine is that the head gasket failed. The head would have lifted due to the excess boost created when our undersized wastegate couldn't cope. Everything else is fine, so we're now busy sorting out a new wastegate control setup for this monster and making a few tweeks from what we have learnt. Everything should be good to go again in a couple of weeks and then the proper mapping can get underway.

Kind of, the basic issue is the 44mm wastegate is nothing like big enough for a compound setup, so just to get going I had to open the SC bypass, at which point (on the dyno) the wastegate could just about cut it.

what happened at Cadwell is the bypass actuator failed and the bypass snapped shut, this then even with the wastegate wide open boosted the engine over 3Bar and rising, straight into det closely followed by the HG saying it's had enough.

currently fitting another HG and looking for a bigger wastegate setup, unfortunately, although the 44mm one we have now is water cooled, none of the bigger ones are, and I am pretty convinced we will have heat issues with un-cooled ones due to the mid-engine install and it being surrounded by red-hot exhaust pipes.

At least I have some time to resolve all this ans also in the meantime I am doing all the jobs that we ran out of time for before Cadwell, like wiring up the additional channels on the data-logger, adding the radio, etc.

current plan is to get out to Snett testing in a couple of weeks time, last thing I want to do is arrive at Croft like we did at Cadwell.

That diffuser needs lowering more and i have the perfect idea of how to do it..

would not spent too much time on this, with the rear wing etc, it's already likely to be too rear biased on Aero, better to keep the rake and work with the front at this point.

Mike, are you going to be able to make a testday before Croft?

[CHILL Gone DUTCH]

[Mangham54]

Are you any closer to a verdict on your engine woes, Simon? Hopefully nothing that's not relatively easy to sort. :unsure:/>

In fact, here ya go:

Great news. All that happened to our engine is that the head gasket failed. The head would have lifted due to the excess boost created when our undersized wastegate couldn't cope. Everything else is fine, so we're now busy sorting out a new wastegate control setup for this monster and making a few tweeks from what we have learnt. Everything should be good to go again in a couple of weeks and then the proper mapping can get underway.

Kind of, the basic issue is the 44mm wastegate is nothing like big enough for a compound setup, so just to get going I had to open the SC bypass, at which point (on the dyno) the wastegate could just about cut it.

what happened at Cadwell is the bypass actuator failed and the bypass snapped shut, this then even with the wastegate wide open boosted the engine over 3Bar and rising, straight into det closely followed by the HG saying it's had enough.

currently fitting another HG and looking for a bigger wastegate setup, unfortunately, although the 44mm one we have now is water cooled, none of the bigger ones are, and I am pretty convinced we will have heat issues with un-cooled ones due to the mid-engine install and it being surrounded by red-hot exhaust pipes.

At least I have some time to resolve all this ans also in the meantime I am doing all the jobs that we ran out of time for before Cadwell, like wiring up the additional channels on the data-logger, adding the radio, etc.

current plan is to get out to Snett testing in a couple of weeks time, last thing I want to do is arrive at Croft like we did at Cadwell.

That diffuser needs lowering more and i have the perfect idea of how to do it..

would not spent too much time on this, with the rear wing etc, it's already likely to be too rear biased on Aero, better to keep the rake and work with the front at this point.

Mike, are you going to be able to make a testday before Croft?

How did Ronin bypass this issue? I seem to recall he had a problem with wastegate sizes on his compound charged exige.

[Scuffers]

How did Ronin bypass this issue? I seem to recall he had a problem with wastegate sizes on his compound charged exige.

not sure what his original problem was, (he says it was his manifold design), but he does not use the SC bypass.

However, he uses a 46mm wastegate on a smaller turbo with a smaller engine, so my guess is he's not quite at the limit's of the wastegate he has.

the root of the problem is actually quite subtle, using the SC in this setup means that the workload for the turbo is much reduced, all we are asking it to do is more a lot of air without having to push too hard to do it, so the (turbo) shaft loads are not that high (compared to a straight turbo setup), this then means that the backpressure in the exhaust (E-Map) is also somewhat reduced as the turbine is not putting up the same resistance (as it would if it was having to work hard), put this together and you have the situation where MAP is higher than E-Map, so the turbo is able to rev very freely.

to slow it down at these low levels of E-Map means you need to bypass way more exhaust than for a turbo only setup, and going on this setup, I'm thinking more than 60%, ie, the majority.

Looking at what we have now is a 1.03ar turbine housing on a 2" inlet going to a 3" exhaust vs a 44mm wastegate on a 47.6mm inlet V-band and 44.4mm outlet (1.75" pipe), in hindsight, it's pretty obvious.

[chris_uk]

Has anything been done to the car yet mike? As for side skirts, jamies looked to just have a sheet of ali sticking out (im sure its more complex tho scuffers before you pipe up) running the length of the sill, surely this couldnt be too expensive to do, we could pick up mounting points at the rear pretty easy and possibly rivnut some at the front, put a line of tigerseal for bonding for extra strength.. Etc

[Mike (Cliffie)]

Are you any closer to a verdict on your engine woes, Simon? Hopefully nothing that's not relatively easy to sort.

In fact, here ya go:

Great news. All that happened to our engine is that the head gasket failed. The head would have lifted due to the excess boost created when our undersized wastegate couldn't cope. Everything else is fine, so we're now busy sorting out a new wastegate control setup for this monster and making a few tweeks from what we have learnt. Everything should be good to go again in a couple of weeks and then the proper mapping can get underway.

Kind of, the basic issue is the 44mm wastegate is nothing like big enough for a compound setup, so just to get going I had to open the SC bypass, at which point (on the dyno) the wastegate could just about cut it.

what happened at Cadwell is the bypass actuator failed and the bypass snapped shut, this then even with the wastegate wide open boosted the engine over 3Bar and rising, straight into det closely followed by the HG saying it's had enough.

currently fitting another HG and looking for a bigger wastegate setup, unfortunately, although the 44mm one we have now is water cooled, none of the bigger ones are, and I am pretty convinced we will have heat issues with un-cooled ones due to the mid-engine install and it being surrounded by red-hot exhaust pipes.

At least I have some time to resolve all this ans also in the meantime I am doing all the jobs that we ran out of time for before Cadwell, like wiring up the additional channels on the data-logger, adding the radio, etc.

current plan is to get out to Snett testing in a couple of weeks time, last thing I want to do is arrive at Croft like we did at Cadwell.

That diffuser needs lowering more and i have the perfect idea of how to do it..

would not spent too much time on this, with the rear wing etc, it's already likely to be too rear biased on Aero, better to keep the rake and work with the front at this point.

Mike, are you going to be able to make a testday before Croft?

Looking into it Simon. Geary did suggest a Snett date and I am looking into availability at Croft.