what did you do to your micra today ?

nah, 14.5psi (1 bar) with a good exhaust system will see 200 I reckon, seeing as 8psi (0.6 bar) has been shown to give150...
 
Enuo said:
nah, 14.5psi (1 bar) with a good exhaust system will see 200 I reckon, seeing as 8psi (0.6 bar) has been shown to give150...
Click to expand...
what dyno tho andy ?
i,m basing it on the 1331cc glanza official figures of 131hp @ 6400 rpm running 9psi
 
yeah going by Chris's car. The maths (Inb4 not real world) suggests 1 bar should give 190 ish hp, based on those figures:
(150hp÷(1bar+0.6bar))x(1bar+1bar)=187.5hp
Maybe it is a tad optimistic...
(((1bar+0.6bar)÷150hp)x200hp)-1bar=1.1bar
16psi...
 
frank said:
can someone explain the discrepancy to me then ?
Click to expand...
Could possibly be catalytic converter, backbox, top mount intercooler, deliberate soft tune to extend life of engine? If you can get +40hp odd out of a golf with just a remap and nothing else...
Edit: Would the cg engine having a longer throw and smaller valves make it respond better to boost?
 
Well stock starlet 1.3 is 75hp ish too:
(131/(14.5+9))x14.5=80hp

For Chris's car:
(150/(1+0.6))x1=93hp

93hp is easily achievable on a cg with just an better intake and peter lloyd exhaust system... which Chris sort of has...
And it's not totally out there to assume the starlet engine was tweeked a little when it was turbo'd...
 
Enuo said:
Well stock starlet 1.3 is 75hp ish too:
(131/(14.5+9))x14.5=80hp

For Chris's car:
(150/(1+0.6))x1=93hp

93hp is easily achievable on a cg with just an better intake and peter lloyd exhaust system... which Chris has...
And it's not totally out there to assume the starlet engine was tweeked a little when it was turbo'd...
Click to expand...
yes you can increase the VE (and hence hp) of an N/A engine by tuning, but a turbo on a stock engine just crudely increases that VE by physically shoving more air in.
so a stock CG is about 80% VE (i guess ?) and 1 bar of boost will increase that VE to 160% surely ?
(doubling the hp)
 
I thought that twice the air meant twice the power too, but maybe it's not quite that simple... Twice the power doesn't double the top speed eh?
 
I'd have though a turbo ignores the volumetric inefficiencies to a large degree no? On na, maximum vacuum in the cylinder to draw air in isn't available until part way through the stroke, turbo gives maximum positive pressure to fill the cylinder even before the inlet valves open... so theres no wait before the cylinders start filling after the inlet valve opens. Or am I missing something.
 
i think VE (volumetric efficiency) directly relates to power output, and vtec,s and superbikes can exceed 100% (as does forced induction)
quote from wiki.
"In most piston engines, intake gases are "pulled" into the engine by the downward stroke of the piston[16][17] (which creates a low-pressure area), similar to drawing liquid using a syringe. The amount of air which is actually inhaled, compared with the theoretical amount if the engine could maintain atmospheric pressure, is called volumetric efficiency.[18] The objective of a turbocharger is to improve an engine's volumetric efficiency by increasing density of the intake gas (usually air)."
 
Unless its the INefficiency... 80% says thats -0.2bar gauge in the cylinder, what if at 1 bar gauge thats still only a 0.2bar drop in pressure, because the whole point of a turbo is it can fill the space in the cylinder faster than the cylinder demands it... and I did some experiments on some air knives with the boss of SMC pneumatics, and we proved that the higher the pressure and available flow to an orrifice (for example, a valve) the more efficiently the air passes through...
 
a vtec with a late closing inlet valve can cram extra air in at high rpm, and actually produce positive pressure in the cylinder eh (ie over 100% VE) so if you gave that engine 1 bar of boost it would exceed 200% i think (re the 1500cc turbo F1 cars from the 80,s)
 
Yeah but that extra air is partly to do with tuned inlet tract length/diameter giving the air enough momentum to create a pressure (pressure being force over area, force being rate of change of momentum), isn't that a non issue with a turbo which generates constant positive pressure? I still think that the % inefficiency decreases as boost pressure increases... economies of scale and all that...
 
Hows this for a coincidence:
80% filled means 0.8 bar actual in the engine at 75hp
2x0.8 bar = 1.6 bar actual in the engine and 150hp
Chris's engine is running 1.6 bar actual outside the engine, if the turbo meant inefficiency was zero, the numbers are perfect.
 
Enuo said:
Hows this for a coincidence:
80% filled means 0.8 bar actual in the engine at 75hp
2x0.8 bar = 1.6 bar actual in the engine and 150hp
Chris's engine is running 1.6 bar actual outside the engine, if the turbo meant inefficiency was zero, the numbers are perfect.
Click to expand...
thats with a 100% effective intercooler, and no extra friction losses tho (airflow/heat/mechanical losses)
 
frank said:
aye 1500cc = 150hp x 4 (bar) = 600hp x 2 x rpm = 1200hp :)
Click to expand...
Yeah that makes sense. As far as all the other losses like friction etc, you get those in the stock engine too, and I don't think the friction really doubles... and very thin oil is being used so fluid drag losses are reduced etc... I dunno, I know it could easily be to do with the dyno being innacurate, I just like the idea that a turbo minimises the inefficiencies as well as increasing the efficiency if that makes sense.
 
frank said:
polly,s was 165 iirc, and stani,s must have been 180+ to do a 14.3 sec 1/4 mile
Click to expand...

stock internal turbo map was 157bhp (suppose stock CR was knocking abit earlier and Ed pulled it back for reliability cos I occasionally ran it on trackdays and mostly as a daily)

forged piston turbo map was 163bhp (larger bore and lower CR)
 
Elliot said:
Hi,

I know what you mean... but the thing is, mine are all perfectly legal. My number plates aren't illegal at all.

Both my Skyline and my K10 have exactly the same kind of plates on them. Sorry about the size of the pics. :)

IM000118.jpg

Im000247.jpg


And my tinted windows are legal too, as they are only the back windows. None of the front windows are tinted at all.

-Elliot
Click to expand...
did you get an at the flywheel estimate?
 
the lower comp forged engine should have less hp @ the same boost level in theory eh.
i,m more inclined to believe the factory figures personally, ie N/A starlet 80hp, glanza 131hp @.65bar and if you work it out as 80 x 1.65 = 132 ;)
other factory figures tend to equate with their turbo models running 50% more power @ .5bar, 75% more power @ .75bar etc
 
Enuo said:
na starlet is 75hp no?
Click to expand...
wiki says
"In some countries, such as Portugal, Starlets were equipped with a 75hp version of the 4E-FE engine."
and The 4E-FE used in the Glanza S generated 85 PS (63 kW; 84 hp)"
eh, but i was going by the quotes of 81 to 99hp for the 4E-FE
my engine "feels" twice as quick but i dont believe i have 2 x 75 hp tho, its deceiving because you get that mad surge of power at about 3k when the turbo kicks in, and my N/A setup had a much more linear powerband , yet so far was only .2 secs slower on the 1/4 mile.
going by theses calculations, if a 15 year old CG13 still actually has 75hp ? then 75 x 2.7 = 200+ hp, and 1.7 bar = 24 psi
 
Another busy weekend of Wales Rally GB Prep....

- Changed the OSR wheel bearing
- Set up hand brake
- Fitted tools and spares
- Fitted the lower front strut brace
- Painted the sills in body matching AJ4
- Sorted the service kit
- Relocated the breather system, as it was hitting the bonnet
- Added an additional earth lead between the shell and battery
- Checked the plugs (all ok)
- Sorted lamp pod fixings and checked wiring - all ok - see
BWdgClaIUAAYAQU.jpg


Also talked through plans with Ian who will be servicing for us

A busy week for the car coming up....

Mon - Collect bumper from Harlen
Tues - Off to see Ed to get her properly mapped and rolling roaded (will post up results on here)
Weds - Take the car to Matt Humphris to have the rear beam strengthened

Leaves a few more jobs to do before the big event

- Raise front ride height
- Change front strut tops
- Scub in tyres
- Fit new front pads
- Fit gear level gaiter
- Fit new air horn
- Sort stickers
- Fit sump guard (sort front mounts), fit foam between guard and sump and splash guards

Oh an MOT on 4th Nov
 
MicrAde said:
Grey definitely, it visually lowers the car ;)

Sent from my HTC One S using Tapatalk 4
Click to expand...
Went into B&Q to get the flap wheel, wahay !!! next to them was a rotary file for leccy drills, bought that instead, bees knees, took the centre out in 20/25 minutes. Back wheels fitted pretty good now.
She was still making a lot of noise though !!!! found it, front discs are shot to bits, badly grooved, I'll have new discs and pads fitted this week hopefully.
 
WDID? Had a though.

Has anyone ever had the Nismo spoiler and Mid spoiler on at same time?

Im going to have but wondering if anyone else has ever done it? and if so any pics? :p
 
McMicra said:
WDID? Had a though.

Has anyone ever had the Nismo spoiler and Mid spoiler on at same time?

Im going to have but wondering if anyone else has ever done it? and if so any pics? :p
Click to expand...
Showing off your jap parts all the time....
Can u not tho m8


'Sent from my bed using paper planes'
 

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