GT30s rock - now with dyno plot :p!
27-10-2004, 03:16 PM
#41
Doug,
That is just the normal fluctuations. The fact is you HAVE the barometric pressure being recorded by the dyno, so it can correct for what is considered to be the normal SAE pressure baseline.
Without this connected, on one day you may get up to 40bhp more or less (on the same engine) than another day as the barometric pressures fluctuate. For example, last night the barometric pressure was quite good and so the un-corrected figure was some 20bhp more than the corrected figure (which adjusts the power to what it would be at the SAE constant).
Also, without this pressure being obtained by a sensor connected to the dyno and printed on the graph (which can be verified at the met office by comparing the date and pressure going back to every day since the early 1900s
), you can cheat the dyno by typing in a particularly low pressure. It will then correct the power up to the baseline, which can add an easy 60bhp 
. This is why you should always ignore dyno sheets that don't have the pressure recorded on each run, as they are then meaningless .
That is just the normal fluctuations. The fact is you HAVE the barometric pressure being recorded by the dyno, so it can correct for what is considered to be the normal SAE pressure baseline.
Without this connected, on one day you may get up to 40bhp more or less (on the same engine) than another day as the barometric pressures fluctuate. For example, last night the barometric pressure was quite good and so the un-corrected figure was some 20bhp more than the corrected figure (which adjusts the power to what it would be at the SAE constant).
Also, without this pressure being obtained by a sensor connected to the dyno and printed on the graph (which can be verified at the met office by comparing the date and pressure going back to every day since the early 1900s
), you can cheat the dyno by typing in a particularly low pressure. It will then correct the power up to the baseline, which can add an easy 60bhp . This is why you should always ignore dyno sheets that don't have the pressure recorded on each run, as they are then meaningless .
27-10-2004, 03:31 PM
#47
Ranj,
No, normal Optimax, as the owner wanted this engine to be ULTRA reliable, so this gives an even bigger safety margin
.
Why, what has he got to hide 
?
No, normal Optimax, as the owner wanted this engine to be ULTRA reliable, so this gives an even bigger safety margin
.
Originally Posted by RANJ
also we have the baro data on diff sheets then the ones the graphs r printed on 
?
bits 
27-10-2004, 03:51 PM
#55
Ranj,
NOT like Rod's manifold - the wastegate piping is completely different to resolve the issues that Rod had (as per the pictures I posted recently) .
PLEASE tell me you're not going to use that shonky integral wastegate thing with the machined out (to wafer thin) 0.63 a/r exhaust housing ?
NOT like Rod's manifold - the wastegate piping is completely different to resolve the issues that Rod had (as per the pictures I posted recently)
.PLEASE tell me you're not going to use that shonky integral wastegate thing with the machined out (to wafer thin) 0.63 a/r exhaust housing
?
27-10-2004, 06:08 PM
#62
PassionFord Post Whore!!
Originally Posted by Mike Rainbird
I did ask on Yum's engine and he said he would, but never did . Check back and see .
. Check back and see .
https://passionford.com/forum/viewto...=asc&start=100 It was Rods post I aked what Info you wanted to see but you never replied,I wonder wheather it makes as much torque as the last GT30 I did 4k 472ftlb 4.5k 483ftlb
and 500hp @6k nice driveable car.Mark
27-10-2004, 06:44 PM
#64
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Originally Posted by Mike Rainbird
Ranj,
Before you get it on Simon's dyno, make sure he connects the barometric compensation to it. Mark will know why and what I mean. Without this printed on the side of each dyno run, the power recorded is meaningless and will fluctuate on a daily basis for the same engine .
Before you get it on Simon's dyno, make sure he connects the barometric compensation to it
. Mark will know why and what I mean. Without this printed on the side of each dyno run, the power recorded is meaningless and will fluctuate on a daily basis for the same engine .As someone who has used Simon Norris's Dyno facility,
I can confirm that it does have barometric compensation installed
and enabled as well as ambient (cell) temperature.
Just because it is not printed out does not mean it isnt used
because as you know, the data printed can be selected as required.
The dyno there is the same as the one that Harvey uses (Superflow 902)
**** EDITED **** Spelling mistakes
mr rainbird
27-10-2004, 09:59 PM
#68
so if the phase sensor is being used on the cam cover why the hell does it still have a dizzy in the block and not a proper blanking plug and drive cog
mike told you t4 were shite
mike told you t4 were shite
28-10-2004, 08:21 AM
#69
Mark,
No the cams mean that the torque is "relatively" low, because it is going in a short-wheel base rwd car (this):
And because it is going to be held flat out everywhere, so the map is VERY conservative.
Ian,
It's peaked as far as this engine is concerned, as it is only on hydraulic lifters and standard crank and rods. With better internals it could have carried on revving and we may then have found the true peak of the turbo (but you would not see that until you map the engine at the next points) - it may have been at 7500 even, but it climbs all the way to the limiter...
Brom,
Because Mountune had no blanking plug / drive cog in stock at the time.
No the cams mean that the torque is "relatively" low, because it is going in a short-wheel base rwd car (this):
And because it is going to be held flat out everywhere, so the map is VERY conservative
.Ian,
It's peaked as far as this engine is concerned, as it is only on hydraulic lifters and standard crank and rods. With better internals it could have carried on revving and we may then have found the true peak of the turbo (but you would not see that until you map the engine at the next points) - it may have been at 7500 even, but it climbs all the way to the limiter...
Brom,
Because Mountune had no blanking plug / drive cog in stock at the time
.
28-10-2004, 09:31 AM
#74
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Originally Posted by Mike Rainbird
Lee,
You're privelleged - now watch to see how you get bombarded by all the Scots asking for the figures
. I trust I can rely on you discression .
You're privelleged - now watch to see how you get bombarded by all the Scots asking for the figures
. I trust I can rely on you discression .
28-10-2004, 10:07 AM
#79
Hi Guido!
Nice car it is going in to. However, I would reiterate that you will need to be really careful with it, as I imagine that it will light the tyres up in almost every gear in the dry, let alone the wet . Put it on position 1 and gradually turn the boost up as you get used to .
Nice car it is going in to
. However, I would reiterate that you will need to be really careful with it, as I imagine that it will light the tyres up in almost every gear in the dry, let alone the wet . Put it on position 1 and gradually turn the boost up as you get used to .