reading turbo maps ?
08-01-2010, 07:20 PM
#1
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reading turbo maps ?
http://www.turbobygarrett.com/turbob...R_707160_5.htm
where in the compressor map would 1.5 bar be ?
where in the compressor map would 1.5 bar be ?
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08-01-2010, 09:11 PM
#11
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08-01-2010, 09:31 PM
#12
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im at the safe limit of the fuel system now really 600 bhp is absolute maximum.
twin 044s would be next with bigger lines if i did it.
not worth it though without going big single turbo gt40 or 42.
shes all good how she is for now
twin 044s would be next with bigger lines if i did it.
not worth it though without going big single turbo gt40 or 42.
shes all good how she is for now
08-01-2010, 11:44 PM
#13
http://www.turbobygarrett.com/turbob...R_707160_5.htm
where in the compressor map would 1.5 bar be ?
where in the compressor map would 1.5 bar be ?
So 1.5 bar is anywhere along that horizontal line.
You want to be in one of the innermost islands, so at 1.5 bar that turbo is happiest at about 29lbs, so your engine currently is pretty much perfectly in that sweetspot, you can of course push it further though, its still on a reasonable island even at aproaching 35lbs, so you've got about 20% more capacity potentially, although the laws of diminishing returns mean that is unlikely to yield more than about 15% power probably.
Some more info here:
http://www.vauxhall-sport-forum.com/...r-map-t92.html
09-01-2010, 05:26 AM
#14
My compressor maps article may help folk with an interest in this topic...
http://www.motorsport-developments.co.uk/stus.html
http://www.motorsport-developments.co.uk/stus.html
09-01-2010, 08:14 AM
#15
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Some more info here:
http://www.vauxhall-sport-forum.com/...r-map-t92.html
http://www.vauxhall-sport-forum.com/...r-map-t92.html
My compressor maps article may help folk with an interest in this topic...
http://www.motorsport-developments.co.uk/stus.html
http://www.motorsport-developments.co.uk/stus.html
09-01-2010, 01:49 PM
#18
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The pressure ratio up the lefthand side of 2.5 relates to 1.5 bar of boost + 1 bar for atmospheric.
So 1.5 bar is anywhere along that horizontal line.
You want to be in one of the innermost islands, so at 1.5 bar that turbo is happiest at about 29lbs, so your engine currently is pretty much perfectly in that sweetspot, you can of course push it further though, its still on a reasonable island even at aproaching 35lbs, so you've got about 20% more capacity potentially, although the laws of diminishing returns mean that is unlikely to yield more than about 15% power probably.
Some more info here:
http://www.vauxhall-sport-forum.com/...r-map-t92.html
So 1.5 bar is anywhere along that horizontal line.
You want to be in one of the innermost islands, so at 1.5 bar that turbo is happiest at about 29lbs, so your engine currently is pretty much perfectly in that sweetspot, you can of course push it further though, its still on a reasonable island even at aproaching 35lbs, so you've got about 20% more capacity potentially, although the laws of diminishing returns mean that is unlikely to yield more than about 15% power probably.
Some more info here:
http://www.vauxhall-sport-forum.com/...r-map-t92.html
09-01-2010, 01:59 PM
#19
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The bottom scale roughly equates to hp( 30 =300, 40 =400 etc), so look at what hp you want to make along thebottom.
If I understand Chips guide correctly that is....
If I understand Chips guide correctly that is....
09-01-2010, 02:13 PM
#20
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im assuming the dotted line curved through the map is the guide to follow which is 29 lb at 1.5 bar, but surely it could be to the left or right of that depending how much air the engine will consume wouldnt it ?
thats the only bit i dont understand, you pic your boost from left scale, but how do you know how much air your flowing from the bottom scale ?
looking at the bottom scale at 2.5 bar boost it could be between 20 and 35 lbs of airflow dependant on compressor speed. theres absoluteley zero surge so its always to the right of that.
09-01-2010, 03:13 PM
#21
You plot your power (airflow) on the bottom and your boost (+1 bar atmo) up the left hand side, and then that point is where you are on the compressor map, so you can see from which island you are in how happy the turbo is with that combination of flow and pressure
09-01-2010, 03:16 PM
#22
yeah ive just read chips and stus, the numbers in the map are compressor speed, bottom numbers are flow of air in lb/min.
im assuming the dotted line curved through the map is the guide to follow which is 29 lb at 1.5 bar, but surely it could be to the left or right of that depending how much air the engine will consume wouldnt it ?
thats the only bit i dont understand, you pic your boost from left scale, but how do you know how much air your flowing from the bottom scale ?
looking at the bottom scale at 2.5 bar boost it could be between 20 and 35 lbs of airflow dependant on compressor speed. theres absoluteley zero surge so its always to the right of that.
im assuming the dotted line curved through the map is the guide to follow which is 29 lb at 1.5 bar, but surely it could be to the left or right of that depending how much air the engine will consume wouldnt it ?
thats the only bit i dont understand, you pic your boost from left scale, but how do you know how much air your flowing from the bottom scale ?
looking at the bottom scale at 2.5 bar boost it could be between 20 and 35 lbs of airflow dependant on compressor speed. theres absoluteley zero surge so its always to the right of that.
09-01-2010, 06:55 PM
#26
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according to the dotted line on the map that coinsides with my dyno runs ive had. 1.2 bar was 544 bhp 1 bar was 520 bhp which are both on the dotted line in the map for that given boost.
10-01-2010, 12:16 PM
#27
10-01-2010, 01:06 PM
#30
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i thought at 2 bar in the centre of the map was 31 lbs/min at 2 bar.
i dont think it will surge as its comsuming every ounce of air at the moment with a 1.7 bar spike, it is viscious gearbox breaking punch
feels good though
imagine 2.2 bar spike 2 bar held
my old cos was 2.2 bar held but did get worryingly high egts flat out in 5th. although that was a .63 rear housing on a 2050 cc, ive now got 2 .64 housings on a 2650 cc.
i dont think it will surge as its comsuming every ounce of air at the moment with a 1.7 bar spike, it is viscious gearbox breaking punch
feels good though
imagine 2.2 bar spike 2 bar held
my old cos was 2.2 bar held but did get worryingly high egts flat out in 5th. although that was a .63 rear housing on a 2050 cc, ive now got 2 .64 housings on a 2650 cc.
22-02-2010, 06:50 PM
#31
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im pondering on a rips surge tank and twin 044 bosch pumps, surge tank fed by tomei in tank 280 lph, 1000 cc injectors, big oil cooler and 2 bar of boost. technically that should be it for 600 - 650 bhp.
cossie rich is running a gt30 at over 2 bar so gt series turbos should be ok at that boost.
got 3 settings on my boost controller so could have 1 bar, 1.5 bar and 2 bar.
cossie rich is running a gt30 at over 2 bar so gt series turbos should be ok at that boost.
got 3 settings on my boost controller so could have 1 bar, 1.5 bar and 2 bar.
Last edited by scoooby slayer; 22-02-2010 at 06:59 PM.
05-03-2010, 09:43 PM
#35
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spoke to tr racing today and theres a good chance just with some 1000ccs i could run 1.7 bar held 
just looking at injector choice now as Ł660 for sards seems abit much !
just looking at injector choice now as Ł660 for sards seems abit much !
05-03-2010, 09:56 PM
#38
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nismo reg, 660cc denso and a tomei in tank the biggest they do.
if it does run out of fuel may have 2 044s in tank but if they can get 1.9 spike 1.7 held to the limiter with no pressure drop il be happy and just stick with the single tomei. ive got 13.9 v at the pump shes holding 5 bar pressure at 1.45 bar boost as she stands at the moment.
if it does run out of fuel may have 2 044s in tank but if they can get 1.9 spike 1.7 held to the limiter with no pressure drop il be happy and just stick with the single tomei. ive got 13.9 v at the pump
shes holding 5 bar pressure at 1.45 bar boost as she stands at the moment.
Last edited by scoooby slayer; 05-03-2010 at 09:57 PM.
05-03-2010, 10:02 PM
#39
nismo reg, 660cc denso and a tomei in tank the biggest they do.
if it does run out of fuel may have 2 044s in tank but if they can get 1.9 spike 1.7 held to the limiter with no pressure drop il be happy and just stick with the single tomei. ive got 13.9 v at the pump shes holding 5 bar pressure at 1.45 bar boost as she stands at the moment.
if it does run out of fuel may have 2 044s in tank but if they can get 1.9 spike 1.7 held to the limiter with no pressure drop il be happy and just stick with the single tomei. ive got 13.9 v at the pump
shes holding 5 bar pressure at 1.45 bar boost as she stands at the moment.
05-03-2010, 10:06 PM
#40
Yes at 2 bar the map makes it look like the turbo will surge everywhere but that setup works on rb26 when you look at with turbine map helps explain it bit more the rate at which the turbine builds boost it influences surge too but im not very good at explaining technical stuff in easy to understand way.