They say it cannot be done - 1000bhp Supercharged VXR8
Discussion
Good results do you know what your IAT2 is and what the recovery rate is after a pull? I ditched my overdrive balancer (Roger still has it somewhere) becuase so much heat was generated at higher rpms.
You should also be aware of cylinders 7&8 running leaner than the rest, get some individual EGT probes fitted. That's what killed Roger Hall's car after running the heartbeat at thunder road.
Some good info here
http://www.superchevy.com/how-to/engines-drivetrai...
You should also be aware of cylinders 7&8 running leaner than the rest, get some individual EGT probes fitted. That's what killed Roger Hall's car after running the heartbeat at thunder road.
Some good info here
http://www.superchevy.com/how-to/engines-drivetrai...
Got the logs somewhere, but around 36C at the end of that pull iirc. On the road it seems to recover pretty quickly once off boost. And yeah, know all about those two cylinders, looking into getting a lid spacer to help airflow as well.
Swerni, yeah it does sound pretty good.
Dom, will try and get along to a meet again soon. We didn't clean up the welds, but may look at that at some point.
Swerni, yeah it does sound pretty good.
Dom, will try and get along to a meet again soon. We didn't clean up the welds, but may look at that at some point.
Edited by HappyMidget on Monday 17th July 22:33
Not for a while yet, gonna be sourcing rods and pistons first. Will also be working with my tuner on the traction control at Thunder Road for optimal launching 
New rears are on order as well, gone for a set of MPS4S in 285 rather than the stock 275, and kept the same 35 profile. Only 7mm diameter extra so not enough to knock the speedo out by too much, but can tweak the profile in the tune if it bugs me too much. Also gonna be putting in the new cooler plugs today if the car is cool enough by lunchtime.
Hoping to get the Kenne Bell Boost-a-Pump sorted by TR just for piece of mind for the long drag at WOT.
New rears are on order as well, gone for a set of MPS4S in 285 rather than the stock 275, and kept the same 35 profile. Only 7mm diameter extra so not enough to knock the speedo out by too much, but can tweak the profile in the tune if it bugs me too much. Also gonna be putting in the new cooler plugs today if the car is cool enough by lunchtime.
Hoping to get the Kenne Bell Boost-a-Pump sorted by TR just for piece of mind for the long drag at WOT.
HappyMidget said:
8Ace said:
Morning.
R8VXF joined the M4 in front of me this morning. It sounded apocalyptic but I noticed a fair amount of smoke as you came dowen the slip road and then moved in Lane 3. Were you aware of this?
Yeah, I think I know what is causing it R8VXF joined the M4 in front of me this morning. It sounded apocalyptic but I noticed a fair amount of smoke as you came dowen the slip road and then moved in Lane 3. Were you aware of this?
Cheers for the heads up though.HappyMidget said:
Quick q, was it from under the car or from exhaust?
Difficult to tell. I would have thought it was from the exhaust but can't be certain due to the speed - the wind whips the smoke around into a vague cloud very quickly. I would say though that it definitely seems worse when the car is under load, it was particularly noticeable as you accelerated down the slip road, but at cruising speed it wasn't visible.8Ace said:
Difficult to tell. I would have thought it was from the exhaust but can't be certain due to the speed - the wind whips the smoke around into a vague cloud very quickly. I would say though that it definitely seems worse when the car is under load, it was particularly noticeable as you accelerated down the slip road, but at cruising speed it wasn't visible.
Yeah, it is definitely an under load thing, only really noticeable to me if I boot it and stop straight away when smoke comes out the top of the bonnet! Disappears pretty quickly so think some oil is spraying onto the headers under load. Need to get under the car to have a look at the bottom of the headers though.HappyMidget said:
Yeah, it is definitely an under load thing, only really noticeable to me if I boot it and stop straight away when smoke comes out the top of the bonnet! Disappears pretty quickly so think some oil is spraying onto the headers under load. Need to get under the car to have a look at the bottom of the headers though.
Assuming you still have the original PCV hoses fitted, any oil caused by blow-by under boost should be ingested back into the throttle body so you shouldn't see it. Also, oil on the headers, assuming you have a leak from elsewhere will make the inside of the car stink of burning oil, especially when in traffic. Leaking oil gets everywhere and you will see the underside of the car coated if it's coming from the front.wormus said:
Assuming you still have the original PCV hoses fitted, any oil caused by blow-by under boost should be ingested back into the throttle body so you shouldn't see it. Also, oil on the headers, assuming you have a leak from elsewhere will make the inside of the car stink of burning oil, especially when in traffic. Leaking oil gets everywhere and you will see the underside of the car coated if it's coming from the front.
Yeah, I need a catch can on the PCV as that is quite oily, but also thought it might be coming from the base of the dipstick tube under high load so not causing an issue in traffic if that makes sense. HappyMidget said:
Yeah, I need a catch can on the PCV as that is quite oily, but also thought it might be coming from the base of the dipstick tube under high load so not causing an issue in traffic if that makes sense.
I'd be worried about the crankcase pressure if you're blowing oil out of the dipstick but only under load.Mikeeb said:
I'd be worried about the crankcase pressure if you're blowing oil out of the dipstick but only under load.
Yeah, not sure what else it could be though, as can find no oil evidence on the top side of the motor and it only smokes under load and disappears pretty quickly. Might see if I can upgrade the ID of the PCV hoses to allow a bit better throughput. Also not losing a significant amount of oil as keep checking the level.
HappyMidget said:
Yeah, not sure what else it could be though
Oil leak will be obvious as the car will stink inside and it's unlikely create excessive smoke as described above. If the smoke is black, it's probably the tune (excess fuel/knock retard), if it's blue, it's probably worn/broken piston rings. dom9 said:
How old is the engine now? Could it be blow-by the rings into the crankcase?
Is that vented to air or the induction, vacuum side?
Apologies if it has been mentioned; skim reading!
We can all crawl under it on Sunday
He's using standard PCV which vents everything back through the throttle body. This won't cause smoke that's visible as any vapours are obviously burned.Is that vented to air or the induction, vacuum side?
Apologies if it has been mentioned; skim reading!
We can all crawl under it on Sunday
I certainly wouldn't be running it at Thunder Road if there are any doubts.
Edited by anonymous-user on Friday 4th August 14:51
@Wormus - tis white smoke so oil. Just had a check of the rocker cover bolts and manged to tweak one up a little. On closer inspection of both sides, the one cover looks a bit dirtier than the other, so may have finally found the issue....
dom9 said:
How old is the engine now? Could it be blow-by the rings into the crankcase?
Is that vented to air or the induction, vacuum side?
Apologies if it has been mentioned; skim reading!
We can all crawl under it on Sunday
Build date of 14/08/2014 so coming up to its 3rd birthday. PCV vents back into intake.Is that vented to air or the induction, vacuum side?
Apologies if it has been mentioned; skim reading!
We can all crawl under it on Sunday
HappyMidget said:
@Wormus - tis white smoke so oil. Just had a check of the rocker cover bolts and manged to tweak one up a little. On closer inspection of both sides, the one cover looks a bit dirtier than the other, so may have finally found the issue....
Sorry to keep banging on but I've had loads of leaks on mine from various points on the engine and know the symptoms. Loose rocker cover definitely needs sorting but a general oil leak onto the exhaust will make you feel sick with the smell before you can see it. One of the reasons I threw away my catch can. White smoke is a bit unusual as it points to head gasket. Easy to speculate having not seen it. Probably worth getting a mate to follow behind and boot it a few times to confirm what's happening. Also, check the coolant expansion tank and oil filler cap for signs of water/oil emulsification.
Good luck.
Ta bud, gonna hope this sorts it. Will check by finding a quiet road and booting it hard before coming to a stop quickly. Was how I first noticed it the other day. Oil smell never makes me feel bad, once managed to spill oil straight on hot headers when topping up and just stood back and waited for it to clear 
Smoke colour reminds me of the same happening now.
Smoke colour reminds me of the same happening now.Gassing Station | Readers' Cars | Top of Page | What's New | My Stuff