Volumetric efficiency for a 7MGTE?

[kemicalx]

Ey all,

Does anybody have an educated estimate (or better still some hard facts from an engine dyno'd stock 7MGTE) as to what the volumetric efficiency of a stock 7M would be, I'm thinking somewhere arounds 88-92% but that's complete speculation..


Thanks alot guys,
Ashlin.

[celicapain]

there is a formula for doing it, something like power / capacity x revs- just google it.

[Billzilla]

Well if it's a GTE then it'll be well over 100% as it's boosted.
If it's about 7psi boost then it'd be (very roughly) about 150% VE.

[oldcorollas]

Ey all,

Does anybody have an educated estimate (or better still some hard facts from an engine dyno'd stock 7MGTE) as to what the volumetric efficiency of a stock 7M would be, I'm thinking somewhere arounds 88-92% but that's complete speculation..


Thanks alot guys,
Ashlin.

what torque at what boost does it make stock?

7M is 3L, so as a very very rough base, take 300Nm as 100% VE, then do as Bill suggested.. the VE will be the % of the 300 x (1+boost)

[chris davey]

Is this for turbo compressor choice? As I have only used the n/a VE estimate of 90% for 1j when calculating the amount of air ingested.

if not, then don't worry about me

[kemicalx]

Thanks for the replys guys,

And Sorry, i should have clarified.. As Chris correctly asked, this is to help select a turbo compressor, and as such i guess i need the Ve of a 7mge with a CR of 8.4:1 (well, thats if having a turbo compression ratio effects the Ve?)

[celicapain]

for turbo compressor sizing calculate Ve with out boost and then apply that value to turbo sizing calculation

[kemicalx]

yep cheers, it's calculating the Ve I'm not to sure about, I'll probably end up just following the consensus of other 7m users in the states anyway.. I don't want to change my exhaust mani or dump pipe, so that limits my choices, and i don't want to spend heaps of money.. so that limits me further still..

Will probably end up going with a journal bearing SP61GT, a Turbonetics 60-1 or just my current CT26 high flowed locally by JPS, won't deliver the bottom end response I'm after but will deliver reasonable numbers and won't break the bank *shrugs*

[oldcorollas]

what is the stock torque of the 7MGE or the 7MGTE (with the stock boost level)?

[kemicalx]

From the M-Engine wiki,

http://en.wikipedia.org/wiki/Toyota_M_engine

GTE

Output was 232 hp (173 kW) at 5600 rpm and 240 ft·lbf (325 Nm) at 4000 rpm for most 5 lbf/in²/0.35 bar versions.

GE

Output was 190-204 hp (142-152 kW) at 6000 rpm and 185-196 ft·lbf (250-265 Nm) at 4800 rpm.

[oldcorollas]

GE, 250-265Nm from 3L = 250/300 or 265/300 = 83% - 88% VE

for GTE, 0.35bar = 1.35 absolute bar so should get 405Nm
325/405 = 80% VE (but this is probably due to the ultra-safe tune used by toyota)

(edit:, this is rough as guts, but at least a starting point)

[chris davey]

Hmm, that means that if the 1jz is similar VE to the 7m-gte I have over estimated VE and therefore artificially increased the amount of air consumed by the engine which AFAIK would then make a turbo seem like it was out of its efficiency range earlier. Hmm... May redo em with lower number and see what sort of diff there is.

[oldcorollas]

the 1JZTE was 363nm? from how much boost?

90% is not a bad starting point, but....

[chris davey]

8psi stock AFAIK

[kemicalx]

awesome thanks again,

So the Ve i should be pumping into my calculations is say .80 - .85? as i'm using a 7mgte and will have aftermarket engine management?