| Page: |
| Home > Help Needed / General Tech Chat > Calculating engine air flow with VE etc | |||||||
 824 Posts Member #: 2065 Post Whore Wiltshire |
8th Sep, 2011 at 08:40:16pm
Sooooooo, I'm away working in Dublin and i'm bored!
On 7th Nov, 2011 apbellamy said:
Shaft seems nice and snug On 24th Mar, 2012 apbellamy said:
no no no no, you need more boost! you can never ever come on here and say I have enough boost, that's just silly. On 29th Mar, 2010 Star Mag said:
these give no problems with good head |
||||||
 11046 Posts Member #: 965 Post Whore Preston On The Brook |
8th Sep, 2011 at 08:42:03pm
http://www.not2fast.com/turbo/glossary/turbo_calc.shtml On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
||||||
|
824 Posts Member #: 2065 Post Whore Wiltshire |
8th Sep, 2011 at 08:57:25pm
Brilliant - thanks Colin.
On 7th Nov, 2011 apbellamy said:
Shaft seems nice and snug On 24th Mar, 2012 apbellamy said:
no no no no, you need more boost! you can never ever come on here and say I have enough boost, that's just silly. On 29th Mar, 2010 Star Mag said:
these give no problems with good head |
||||||
|
11046 Posts Member #: 965 Post Whore Preston On The Brook |
8th Sep, 2011 at 09:21:41pm
GT1752 is a 50 trim compressor 0.53 A/R. Turbine trim is 70 trim 0.47AR. If that helps any.
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
||||||
|
11046 Posts Member #: 965 Post Whore Preston On The Brook |
8th Sep, 2011 at 09:28:34pm
On 8th Sep, 2011 almichie said:
Brilliant - thanks Colin. That works a treat! at 18psi with all the other bits programmed in I can expect 194BHP with 142lb/f torque. However the inlet temp will be 52 degrees c What you need to realise is that the 'RPM' variable is where you would expect peak horsepower, and should be adjusted to suit your cam. You then need to switch the VE number from 75% to 100% to give you an estimated HP range, since finding out the actual VE without some real HP numbers is difficult. The 16v heads are ~90 to 95% VE with the 5 ports ~75 to 80%VE Also change the AFR value to 12.5:1 and the BSFC to 0.51, since these engines are not exactly the most efficient That should then give you some reasonable HP figures. On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
||||||
 8604 Posts Member #: 573 Formerly Axel Podland |
8th Sep, 2011 at 10:05:47pm
On 8th Sep, 2011 Sprocket said:
The 16v heads are ~90 to 95% VE with the 5 ports ~75 to 80%VE Where did you get that information from Colin? Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
|
||||||
|
11046 Posts Member #: 965 Post Whore Preston On The Brook |
8th Sep, 2011 at 10:24:59pm
Use real numbers and work backwards.
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
||||||
|
824 Posts Member #: 2065 Post Whore Wiltshire |
9th Sep, 2011 at 08:16:31am
On 8th Sep, 2011 Sprocket said:
On 8th Sep, 2011 almichie said:
Brilliant - thanks Colin. That works a treat! at 18psi with all the other bits programmed in I can expect 194BHP with 142lb/f torque. However the inlet temp will be 52 degrees c What you need to realise is that the 'RPM' variable is where you would expect peak horsepower, and should be adjusted to suit your cam. You then need to switch the VE number from 75% to 100% to give you an estimated HP range, since finding out the actual VE without some real HP numbers is difficult. The 16v heads are ~90 to 95% VE with the 5 ports ~75 to 80%VE Also change the AFR value to 12.5:1 and the BSFC to 0.51, since these engines are not exactly the most efficient That should then give you some reasonable HP figures. 174-236BHP, 128-171Lb/ft With your figures. So the real figures look good, and looking at other members set ups it looks to be the correct figures for my engine. Its got an avonbar billet phase 2 and med FIS head btw. Where did you find the GT1752 map? Thanks On 7th Nov, 2011 apbellamy said:
Shaft seems nice and snug On 24th Mar, 2012 apbellamy said:
no no no no, you need more boost! you can never ever come on here and say I have enough boost, that's just silly. On 29th Mar, 2010 Star Mag said:
these give no problems with good head |
||||||
|
8604 Posts Member #: 573 Formerly Axel Podland |
9th Sep, 2011 at 08:49:07am
On 8th Sep, 2011 Sprocket said:
Use real numbers and work backwards. Peak HP on a standard Cooper SPi is 63hp at 5700rpm at 75%VE and conservative factory fueling of 13.2:1, while peak torque is 70lbft at 3900rpm at 85%VE. So, erm, yes, bigger cams, bigger heads and such will give better VE numbers My 16valver come in at around 90%VE standard head with LT inlet and RS exhaust. Hardly a valid comparison in this situation. Using real numbers from the NMS RR day in 2009 and Robert's SOT graph shows that the difference in VE between a turbo 5 port and turbo 16v is around 5%. Granted that if you are camming for a 9k rev limit then the difference would be as you suggest Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
|
||||||
 6753 Posts Member #: 828 Post Whore uranus |
9th Sep, 2011 at 09:06:11am
and remember the 1st cylinder to open supercharges the adjacent cylinder so skewing the ve ... Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
||||||
 16540 Posts Member #: 4241 King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner Rotherham, South Yorkshire |
9th Sep, 2011 at 09:52:59am
On 9th Sep, 2011 almichie said:
174-236BHP, 128-171Lb/ft With your figures. So the real figures look good, and looking at other members set ups it looks to be the correct figures for my engine. Its got an avonbar billet phase 2 and med FIS head btw.Thanks Similar spec to the metro van's engine. 174bhp and 178lb/ft at 17psi allegedly. Still going strong at 25 psi.... On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it 
|
||||||
|
11046 Posts Member #: 965 Post Whore Preston On The Brook |
9th Sep, 2011 at 10:41:35am
On 9th Sep, 2011 apbellamy said:
Still going strong at 25 psi.... I swear I saw the crank sitting on the bench at the Force Racing workshop  
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
||||||
 10023 Posts Member #: 1456 Mongo Barnsley, South Flatcapshire |
9th Sep, 2011 at 10:44:23am
That you probably did. Due to our ineptitude of setting up the pre-verto clutch. If something is worth doing, it's worth doing half of. |
||||||
|
16540 Posts Member #: 4241 King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner Rotherham, South Yorkshire |
9th Sep, 2011 at 11:00:58am
It's gear box and a few other bits will be joining it soon.... On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it
|
||||||
 7265 Posts Member #: 1268 The Boom Boom speaker Police! Essex |
9th Sep, 2011 at 11:18:46am
Sorry to go slightly OT, but are you guys running more than 20psi with the GT17's standard actuator. In the 13's at last!.. Just |
||||||
|
10023 Posts Member #: 1456 Mongo Barnsley, South Flatcapshire |
9th Sep, 2011 at 11:37:00am
yes! If something is worth doing, it's worth doing half of. |
||||||
|
16540 Posts Member #: 4241 King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner Rotherham, South Yorkshire |
9th Sep, 2011 at 12:16:32pm
Thought it was a 2056 actuator? On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it
|
||||||
|
10023 Posts Member #: 1456 Mongo Barnsley, South Flatcapshire |
9th Sep, 2011 at 12:24:47pm
no. gt17 actuator from mikey boy. he has my old gt20 actuator on the tangeringe. If something is worth doing, it's worth doing half of. |
||||||
| Home > Help Needed / General Tech Chat > Calculating engine air flow with VE etc | |||||||
|
|||||||
| Page: |