Andy luvs V6s
New Member
where do you people learn all this?!
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Right, dont a bit of crunching and comp map comparisons.
Assuming your running a peak rpm of about 7400, your looking at an internal CFM consumption of 391.84 CFM, or 333.06 at 85% VE.
You say your manifold temps are 35 deg, or a rankin temp of about 555 degF. A pressure ratio of 2.2 that you wanted to work with, or PsiA 32.4.
Thats about 61.8 lb/min mass at your intercooled value, and 52.55 lb/min at corrected VE.
Now using the basis of 500bhp, and assuming your going to be aiming for that, the GT3076R flows a peak of 53lb/min which is RIGHT on the choke limit of sonic velocity, but i doubt that should be a real issue unless 520odd bhp is a true and honest target.
I think that you'd probably benefit in a lower required pressure ratio if your inlet manifold and heads werent so poor, then you wont have to cool the charge as much.
Assuming your running a peak rpm of about 7400, your looking at an internal CFM consumption of 391.84 CFM, or 333.06 at 85% VE.
You say your manifold temps are 35 deg, or a rankin temp of about 555 degF. A pressure ratio of 2.2 that you wanted to work with, or PsiA 32.4.
Thats about 61.8 lb/min mass at your intercooled value, and 52.55 lb/min at corrected VE.
Now using the basis of 500bhp, and assuming your going to be aiming for that, the GT3076R flows a peak of 53lb/min which is RIGHT on the choke limit of sonic velocity, but i doubt that should be a real issue unless 520odd bhp is a true and honest target.
I think that you'd probably benefit in a lower required pressure ratio if your inlet manifold and heads werent so poor, then you wont have to cool the charge as much.
Worryingly I understand that.
Looking at the compressor map and spending the majority of the time in the 3500 - 6500rpm area am I running on the effeciency island of the compressor.
Could you tell me airflow at 3500, 4500, 5500, and 6500 so I can plot it and select the correct compressor wheel??
Or is the Turbo you listed spot on?
Thanks for your help here Ben
Looking at the compressor map and spending the majority of the time in the 3500 - 6500rpm area am I running on the effeciency island of the compressor.
Could you tell me airflow at 3500, 4500, 5500, and 6500 so I can plot it and select the correct compressor wheel??
Or is the Turbo you listed spot on?
Thanks for your help here Ben
I would go for the T3076R with 0.60 AR comp housing and 0.62 turbine housing
3500 - 185 cfm @ corr boost = 29.2lbs/mins
4500 - 238 cfm @ corr boost = 37.5lbs/mins
5500 - 291 cfm @ corr boost = 45.9lbs/mins
6500 - 344 cfm @ corr boost = 54.3lbs/mins
To correct VE just multiply by 0.85, only an assumed VE though.
3500 - 185 cfm @ corr boost = 29.2lbs/mins
4500 - 238 cfm @ corr boost = 37.5lbs/mins
5500 - 291 cfm @ corr boost = 45.9lbs/mins
6500 - 344 cfm @ corr boost = 54.3lbs/mins
To correct VE just multiply by 0.85, only an assumed VE though.
The smaller one in invariably spool up quicker and hold you in an area of greater efficiency earlier on, however you need to decide if your really going to push a real 500bhp through it.
If you are going to, and are going to use that level alot, then the slightly bigger turbo might help, or an higher AR on the smaller turbo.
If you are going to, and are going to use that level alot, then the slightly bigger turbo might help, or an higher AR on the smaller turbo.
I'll stick with smaller - its the mid range I'm after and torque in the 2500 - 5500 area.
Boost control on the Motec is excellent so I can play with the pr on the way through the range.
You had a play with any plenums on the V for a boosted engine - be nice to have a central inlet from above?
Boost control on the Motec is excellent so I can play with the pr on the way through the range.
You had a play with any plenums on the V for a boosted engine - be nice to have a central inlet from above?
500bhp is really a headline number on overboost - I'm having it mapped at 300 (8psi), 400 (12psi) and 450 (15psi) with an overboost (18psi) at 90+% throttle at 500bhp.
Peak Torque figures are a little less but similar.
This is all switchable on the latest Motec v3 software - the 4th map being a wet/slippery/granny map with full TC running 3psi of boost.
Currently 10psi with the charger at 360bhp/300lb/ft on the dyno peaking at 6600rpm
Peak Torque figures are a little less but similar.
This is all switchable on the latest Motec v3 software - the 4th map being a wet/slippery/granny map with full TC running 3psi of boost.
Currently 10psi with the charger at 360bhp/300lb/ft on the dyno peaking at 6600rpm
Andy luvs V6s
New Member
*Jaw Drops to the Floor* :shock:
Call when i've had a chat?.....
Dont i have to call to chat first? lol
Calculated that you'll roughly have an comp exit temp of about 147 degC at peak output of a 2.2 pressure ratio, using 62% efficiency. The larger turbo will obviously have lower temps.
Thought about water injection?
Dont i have to call to chat first? lol
Calculated that you'll roughly have an comp exit temp of about 147 degC at peak output of a 2.2 pressure ratio, using 62% efficiency. The larger turbo will obviously have lower temps.
Thought about water injection?
You know what I mean!!!
With the two charge coolers I have an effeciency of 70% plus - the first one killing 55% of the heat - the second showing higher effeciencies as the inlet temps rise due to the temp difference between chargecooler water and air temps.
I should be able to manage AIT to 40ish degrees and beyind 50 have 5 degrees of ignition retard kicking in to kill any detting on Overboost.
Did think of water injection but shoulddn't need it - biggest issue is oil temps!!!!!!
I don't run a lot of advance - it han't proved necessary and reliability has been good.
With the two charge coolers I have an effeciency of 70% plus - the first one killing 55% of the heat - the second showing higher effeciencies as the inlet temps rise due to the temp difference between chargecooler water and air temps.
I should be able to manage AIT to 40ish degrees and beyind 50 have 5 degrees of ignition retard kicking in to kill any detting on Overboost.
Did think of water injection but shoulddn't need it - biggest issue is oil temps!!!!!!
I don't run a lot of advance - it han't proved necessary and reliability has been good.
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